JP2006323332A - Electro-optical device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electro-optical device capable of improving both the utilization efficiency of light from a backlight and expanding color reproducibility.
An electro-optical device includes a display area in which a plurality of pixels are arranged, and a backlight unit. The pixel includes four types of color filters having different light transmission characteristics. Of the four types of color filters, two types are used as the first filter group, and the remaining two types are used as the second filter group. The backlight unit 40 includes the planar light guide plate 41, the first sub-light source 42 and the first 2 sub-light sources 43. The planar light guide plate 41 includes a first light guide 44 that guides the light emitted from the first sub-light source 42 to the first filter group, and a second light guide that guides the light emitted from the second sub-light source 43 to the second filter group. 2 light guide unit 45.
[Selection] Figure 4

Description

  The present invention relates to, for example, an electro-optical device and an electronic apparatus.

Conventionally, electro-optical devices such as liquid crystal display devices are known. The electro-optical device includes, for example, a first substrate, a second substrate provided to face the first substrate, and a liquid crystal provided between the first substrate and the second substrate. And a light guide plate provided on the opposite side of the first substrate and the second substrate, and a backlight attached to the light guide plate.
The first substrate includes a plurality of scanning lines, a plurality of data lines, and a plurality of pixel circuits provided corresponding to the intersection of the scanning lines and the data lines. A common electrode is provided on the first substrate side of the second substrate. These scanning lines, data lines, pixel circuits, and common electrodes are connected to a control circuit (see Patent Document 1).

  In the electro-optical device as described above, for example, a display region configured by arranging a plurality of pixels is formed on the first substrate side of the second substrate. Each pixel is configured by arranging sub-pixels including red (R), green (G), and blue (B) color filters.

FIG. 23 is a diagram showing light transmittance of a color filter according to a conventional example.
Each color filter transmits light of a specific wavelength and attenuates light of other wavelengths. In the International Commission on Illumination (CIE), 700.0 nm as red light, 546.1 nm as green light, and 435.8 nm as blue light are respectively transmitted as peaks. For this reason, the color filters are designed to pass light around 700.0 nm of red light, 546.1 nm of green light, and 435.8 nm of blue light, and attenuate light of other wavelengths as much as possible. Is done.

The backlight is composed of, for example, a cold cathode fluorescent tube (CCFL) or an LED (light emitting diode), and emits light with a predetermined luminance characteristic.
FIG. 24 is a diagram illustrating luminance characteristics of the three-color LED. Specifically, the three-color LED includes three types of LEDs of red (R), green (G), and blue (B).
FIG. 25 is a diagram showing the luminance characteristics of the cold cathode fluorescent tube. Specifically, the cold cathode fluorescent tube is a three-wavelength fluorescent tube coated with a phosphor so as to emit red light, green light, and blue light.
As shown in FIGS. 24 and 25, the backlight is designed so that luminance peaks occur in the vicinity of 700.0 nm, 546.1 nm, and 435.8 nm in accordance with the International Commission on Illumination (CIE) standard.

According to the electro-optical device described above, when light is emitted from the backlight with a predetermined luminance characteristic, the light is diffused in the light guide plate, passes through the liquid crystal shutter controlled by the control circuit, and then the entire display area. Is irradiated. The light incident on each pixel in the display area passes through the color filter according to a predetermined light transmission characteristic and is emitted from the sub-pixel. Therefore, it can be said that the balance between the backlight and the color filter is important in order to display a color as close to natural as possible.
JP 2000-28984 A

  By the way, in the electro-optical device described above, a three-color LED or a cold cathode fluorescent tube that generates radiance peaks in red (R), green (G), and blue (B) is used as a backlight. Uses only one of the three types of red (R), green (G), and blue (B). Therefore, when the area is converted, the light use efficiency of the backlight is approximately 1/3. . Therefore, the electro-optical device described above has a problem that the light use efficiency of the backlight is low.

FIG. 26 shows the luminance characteristics of each sub-pixel when the above-described three-color LED is used as a backlight.
FIG. 27 shows the luminance characteristics of each sub-pixel when the above-described cold cathode fluorescent tube is used as a backlight.
In addition, as shown in FIGS. 26 and 27, each color filter actually does not completely block even if light of an unnecessary wavelength is attenuated. For example, the red (R) color filter slightly transmits blue light having a wavelength in the vicinity of 435.8 nm. That is, blue light is lost from the red (R) color filter. For this reason, the red (R) sub-pixel emits blue light slightly mixed with red light.
Similarly, red light is emitted from the blue (B) color filter, and the red light is slightly mixed with the blue light and emitted from the blue (B) sub-pixels. Therefore, there is a problem that the color purity of each color is lowered and the color reproducibility is lowered.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electro-optical device and an electronic apparatus that can achieve both improvement in utilization efficiency of light from a backlight and expansion of color reproducibility.

  The electro-optical device of the present invention includes a display unit in which a plurality of pixels are arranged, a light source, and a light guide unit that guides light emitted from the light source to the pixel, and the pixel has light transmission characteristics. An electro-optical device including a plurality of different color filters, wherein the plurality of color filters are provided separately in a first filter group and a second filter group, and the light source is a first sub-light source having different luminance characteristics And a second sub light source, wherein the light guide unit guides the light emitted from the first sub light source to the first filter group, and the light emitted from the second sub light source. And a second light guide part that leads to the second filter group.

  According to the present invention, only the light emitted from the first sub-light source is incident on the color filter constituting the first filter group, and the color filter constituting the second filter group is emitted from the second sub-light source. Only the incident light is incident.

Therefore, the luminance characteristic of the first sub-light source is set so that the proportion of light transmitted through the first filter group is increased, and the second sub-light source is configured so that the proportion of light transmitted through the second filter group is increased. By simply setting the luminance characteristic, the light attenuated or blocked in each color filter can be reduced, the light use efficiency of the backlight can be improved, and the power consumption can be reduced.
For example, in a conventional electro-optical device, only one of three types of red (R), green (G), and blue (B) is used for each color filter. In terms of area, it was about 1/3. However, according to the present invention, the light use efficiency of the backlight can be improved by appropriately adjusting the type of the color filter constituting each filter group.

  Further, even if the type of color filter constituting the first filter group has a characteristic of transmitting the remaining type of light to some extent, the remaining type of light is not physically incident on the first filter group. The kind of light remaining from the color filters constituting the first filter group is not emitted. The same applies to the second filter group. Therefore, color reproducibility can be improved by suppressing color mixing regardless of the light transmission characteristics of each color filter.

  In the electro-optical device according to the aspect of the invention, the first filter group includes a red color filter and a green color filter for each row or column, and the second filter group includes a red color filter for each row or column. , Green, and blue, and a blue color filter. The first sub-light source emits red light and green light, and the second sub-light source is blue light. It is preferable to emit the complementary color light.

Here, as a complementary color of red, green, and blue, for example, cyan which is an additive color mixture of blue and green and a complementary color of red can be given.
According to the present invention, red light and green light transmitted through the first filter group are emitted from the first sub-light source, and blue light and complementary light transmitted through the second filter group are emitted from the second sub-light source. The light use efficiency is approximately halved, so that the light use efficiency of the backlight can be improved and the power consumption can be reduced.

  Further, since blue light and complementary color light do not physically enter the first filter group, blue light and complementary color are obtained from the red (R) and green (G) color filters constituting the first filter group. The light will not be emitted. Similarly, no red light or green light is emitted from the blue (B) or complementary color filters constituting the second filter group. Therefore, regardless of the light transmission characteristics of each color filter, color mixing can be suppressed and the color purity of each color can be improved.

  In the electro-optical device according to the aspect of the invention, the light guide unit may have a substantially rectangular shape, and the first sub light source and the second sub light source may be provided along two opposite sides of the light guide unit, The light guide unit includes a first light guide unit that guides light emitted from the first sub-light source to the first filter group, and a second guide member that guides light emitted from the second sub-light source to the second filter group. And a plurality of first light guiding portions extending along the first sub-light source, and a plurality of portions extending at predetermined intervals in a direction orthogonal to the first light guiding portion. A first main light guide portion extending along the second sub light source, and a predetermined interval in a direction orthogonal to the second main light guide portion. A plurality of second sub light guide portions extending every other, and between the first sub light guide portions of the first light guide portion, a second of the second light guide portions. A light guide part is disposed, and a first sub light guide part of the first light guide part is disposed between the second sub light guide parts of the second light guide part, and the first light guide part. And the second light guide unit are preferably combined.

  In the electro-optical device according to the aspect of the invention, the first filter group includes two of red, green, and blue color filters, and the second filter group includes the remaining one color filter. Preferably, one sub-light source emits two of red light, green light, and blue light, and the second sub-light source emits the remaining one.

  According to the present invention, the light utilization efficiency is approximately ½ or substantially 1/1, so that the light utilization efficiency of the backlight can be improved and the power consumption can be reduced. Further, regardless of the light transmission characteristics of each color filter, it is possible to suppress color mixing and improve the color purity of each color.

  In the electro-optical device according to the aspect of the invention, a first detection unit that is provided in the first light guide unit and detects a light amount in a predetermined wavelength band corresponding to a light transmission characteristic of the first filter group, and the second light guide unit And a second detection means for detecting a light quantity in a predetermined wavelength band corresponding to the light transmission characteristics of the second filter group.

Conventionally, in order to properly maintain the balance of display colors, a method of attaching an optical sensor for detecting the amount of light to the backlight and performing feedback control of the backlight based on the amount of light detected by the optical sensor is known. .
In this case, an optical sensor that detects wavelength bands of all colors of the display color is used. That is, when using three color filters of red (R), green (G), and blue (B), an optical sensor that detects all the wavelength bands of these three colors is used.
However, even if the above-described optical sensors are provided in the first light guide unit and the second light guide unit according to the above-described method, the light transmission characteristics are different between the first filter group and the second filter group. Therefore, the wavelength band that needs to be detected by the first light guide unit is different from the wavelength band that needs to be detected by the second light guide unit. For this reason, the above-described optical sensor is over-specification, which may increase the cost.
Therefore, according to the present invention, the first detection means for detecting the light amount in a predetermined wavelength band corresponding to the light transmission characteristic of the first filter group, and the wavelength band in a predetermined range corresponding to the light transmission characteristic of the second filter group And a second detection means for detecting the amount of light. That is, detection means for detecting a predetermined wavelength band corresponding to each filter group is provided. Therefore, the function of the detection means does not become overspec, and the cost can be reduced.

  In the electro-optical device according to the aspect of the invention, the first filter group includes a red color filter and a green color filter for each row or column, and the second filter group includes a red color filter for each row or column. , Green, and blue, and a blue color filter. The first sub-light source emits red light and green light, and the second sub-light source is blue light. And the complementary color light is emitted, the first detection means detects the light quantity in the wavelength band of red light and green light, and the second detection means detects the light quantity in the wavelength band of blue light and the complementary color light. Control means for detecting and controlling the first sub-light source based on the light quantity detected by the first detection means, and for controlling the second sub-light source based on the light quantity detected by the second detection means It is preferable to provide.

  According to this invention, the first detection means detects the light amounts in the wavelength bands of the red light and the green light emitted from the first sub-light source, and the second detection means detects the blue light emitted from the second sub-light source. And the light quantity of the wavelength band of complementary color light was detected, and the first and second sub-light sources were controlled based on the light quantities detected by the first and second detection means. Therefore, even if the characteristics of the light source change due to the ambient temperature of the light source or the heat generation of the light source itself, the change in the characteristic can be detected and feedback controlled, so that the display color balance can be maintained appropriately.

  An electronic apparatus according to the present invention includes the above-described electro-optical device.

  An illumination device according to the present invention is an illumination device including a light source and a light guide unit that guides light emitted from the light source to a pixel. The light source includes a first sub-light source and a second sub-light source having different luminance characteristics. A light source; and the light guide includes: a first light guide that guides light emitted from the first sub-light source; and a second light guide that guides light emitted from the second sub-light source. The light guide part has a substantially rectangular shape, and the first sub light source and the second sub light source are provided along two opposite sides of the light guide part.

  According to the present invention, only the light emitted from the first sub-light source is incident on the pixel constituted by the predetermined color filter, and the pixel constituted by the other color filter is emitted from the second sub-light source. Only the incident light is incident. Therefore, the light attenuated or blocked in each color filter can be reduced, the light use efficiency of the backlight can be improved, and the power consumption can be reduced.

  Further, the light from the second sub light source does not enter the pixel on which the light from the first sub light source is incident. Further, the light from the first sub light source does not enter the pixel on which the light from the second sub light source is incident. Therefore, color reproducibility can be improved by suppressing color mixing regardless of the light transmission characteristics of the color filters constituting the pixels.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.

<1. First Embodiment>
FIG. 1 is a perspective view showing the overall configuration of the electro-optical device 1 according to the first embodiment of the present invention, and FIG. 2 is a ZZ ′ sectional view of FIG.
The electro-optical device 1 includes an element substrate 10 on which a pixel electrode 11 and the like are formed, a counter substrate 20 that is disposed opposite to the element substrate 10 and on which a common electrode 21 and the like are formed, and between the element substrate 10 and the counter substrate 20. And a backlight unit 40 that is provided on the lower side of the element substrate 10 (on the side opposite to the counter substrate 20) and irradiates the liquid crystal 30 with light.
The element substrate 10 is formed of glass, a semiconductor, or the like, and various circuits and the like are formed on the element substrate 10 using TFTs (Thin Film Transistors). The counter substrate 20 is made of a transparent material such as glass.

  A seal member 32 that seals the gap between the element substrate 10 and the counter substrate 20 is provided on the outer peripheral portion of the counter substrate 20. The sealing member 32 forms a space in which the liquid crystal 30 is sealed together with the element substrate 10 and the counter substrate 20. A spacer 33 is mixed in the seal member 32 in order to maintain a distance between the element substrate 10 and the counter substrate 20. Note that an opening for enclosing the liquid crystal 30 is formed in the seal member 32, and the opening is sealed with a sealing material 34 after the liquid crystal 30 is encapsulated.

  Here, a data line driving circuit 200 for driving a data line extending in the X direction is formed on the surface of the element substrate 10 on the counter substrate 20 side and outside one side of the seal member 32. Further, a plurality of connection electrodes 201 are formed on one side, and various signals and image signals from a control circuit (not shown) are input through the connection electrodes 201. In addition, on both sides of the one side of the seal member 32, a scanning line driving circuit 100 that drives the scanning line extending in the Y direction is formed.

A display region 22 as a display unit is formed on the surface of the counter substrate 20. Although not shown, a black matrix is formed in gaps between color filters 24R, 24G, 24B, and 24C, which will be described later, and the periphery of the display area 22 in the display area 22 to prevent the incidence of external light.
A protective film (not shown) is formed on the color filter and the black matrix, and the common electrode 21 is formed on the protective film. The common electrode 21 is electrically connected to the element substrate 10 via a conductive material provided in at least one of the four corners of the element substrate 10. In addition, an alignment film or the like that has been rubbed in a predetermined direction is provided on the opposing surface side of the element substrate 10 and the counter substrate 20, and a polarizing plate corresponding to the alignment direction is provided on each back surface side. .

FIG. 3 is a schematic plan view of the display area 22.
The display area 22 is configured by arranging a plurality of pixels 23, and each pixel 23 has four kinds of colors having different light transmission characteristics of red (R), green (G), blue (B), and cyan (C). It includes filters 24R, 24G, 24B, and 24C. Specifically, each pixel 23 is configured by arranging these color filters 24R, 24B, 24G, and 24C in a substantially square shape. Instead of the cyan (C) color filter 24C, which is a complementary color of red (R), a color filter of any complementary color of green (G) and blue (B) may be included.

  Here, the four types of color filters are divided into a first filter group 61 and a second filter group 62. That is, the red (R) and green (G) color filters 24R and 24G are the first filter group 61, and the blue (B) and cyan (C) color filters 24B and 24C are the second filter group 62. Then, in each pixel 23, the first filter group 61 and the second filter group 62 are alternately arranged in the vertical direction in FIG.

  In each first filter group 61, the red (R) and green (G) color filters 24R and 24G are arranged side by side in the horizontal direction in FIG. Specifically, the red (R) color filter 24R is arranged on the left side, and the green (G) color filter 24G is arranged on the right side. The present invention is not limited to this, and the red (R) color filter 24R may be arranged on the right side, and the green (G) color filter 24G may be arranged on the left side.

  The first filter group 61 as described above is arranged side by side in the horizontal direction in FIG. Thus, the red (R) and green (G) color filters 24R and 24G are alternately arranged in a straight line in the horizontal direction in FIG. That is, the first filter group 61 includes red (R) and green (G) color filters 24R and 24G for each row.

  In each second filter group 62, the blue (B) and cyan (C) color filters 24B and 24C are arranged side by side in the horizontal direction in FIG. Specifically, a cyan (C) color filter 24C is disposed on the left side, and a blue (B) color filter 24B is disposed on the right side. Not limited to this, the cyan (C) color filter 24C may be arranged on the right side, and the blue (B) color filter 24B may be arranged on the left side.

  The second filter group 62 as described above is arranged side by side in the horizontal direction in FIG. As a result, the blue (B) and cyan (C) color filters 24B and 24C are alternately arranged in a straight line in the horizontal direction in FIG. In other words, the second filter group 62 includes blue (B) and cyan (C) color filters 24B and 24C for each row.

FIG. 4 is a schematic plan view and a side view showing the configuration of the backlight unit 40.
The backlight unit 40 includes a planar light guide plate 41 serving as a substantially rectangular light guide, and a first sub provided along two opposite sides of the planar light guide plate 41 in the horizontal direction in FIG. A first backlight 42 as a light source and a second backlight 43 as a second sub-light source.
Although not shown, a prism sheet is provided on the element substrate 10 side of the planar light guide plate 41 in order to improve luminance, and the light emitted from the backlights 42 and 43 is diffused on the prism sheet. A diffusion plate is provided. In addition, a reflective plate is provided on the opposite side of the planar light guide plate 41 from the element substrate 10.

The first backlight 42 includes a plurality of red (R) and green (G) LEDs 421 and 422 arranged alternately. Accordingly, the first backlight 42 emits red light and green light.
The second backlight 43 is formed by alternately arranging a plurality of blue (B) and cyan (C) LEDs 431 and 432. Thereby, the second backlight 43 emits blue light and cyan light.

  The planar light guide plate 41 causes the light emitted from the backlights 42 and 43 to emit light and emits the light emitted from the first backlight 42 to the first filter group 61. The second light guide unit 45 guides the light emitted from the second backlight 43 to the second filter group 62.

  The first light guide unit 44 includes a first main light unit 441 extending in the vertical direction in FIG. 4 along the first backlight 42, and a plurality of first main light units 441 extending in the horizontal direction in FIG. 4 from the first main light unit 441. A sub light guide 442. Specifically, the first sub light guides 442 extend in a direction orthogonal to the direction in which the first main light unit 441 extends, and are provided substantially in parallel at predetermined intervals. Accordingly, the first sub light guide unit 442 is provided in a comb-tooth shape with respect to the first main light guide unit 441.

  The second light guide 45 includes a second leading light 451 extending in the vertical direction in FIG. 4 along the second backlight 43, and a plurality of second light extending from the second leading light 451 in the horizontal direction in FIG. A sub light guide 452. Specifically, the second sub light guides 452 extend in a direction orthogonal to the direction in which the first main light unit 451 extends, and are provided substantially in parallel at predetermined intervals. Accordingly, the second sub light guide unit 452 is provided in a comb-like shape with respect to the first main light unit 451.

  A second sub light guide 452 of the second light guide 45 is disposed between the first sub light guides 442 of the first light guide 44, and the second sub light guide 45 of the second light guide 45 is disposed. By arranging the first sub light guide part 442 of the first light guide part 44 between the light guide parts 452, the first light guide part 44 and the second light guide part 45 are combined, A planar light guide plate 41 is configured.

FIG. 5 is a schematic plan view and a side view showing a state in which the backlight unit 40 is superimposed on the display area 22.
Each first sub light guide portion 442 of the first light guide portion 44 extends along the back surface of the first filter group 61 arranged in a straight line. Further, the second sub light guide 452 of the second light guide 45 extends along the back surface of the second filter group 62 arranged in a straight line.

The operation of the above electro-optical device 1 is as follows.
The first backlight 42 emits red (R) and green (G) light. Then, this light enters the first light guide 44 of the planar light guide plate 41, passes through the first leading light 441 and the first sub light guide 442 of the first light guide 44, and the liquid crystal formed by the liquid crystal 30. Pass the shutter. Thereafter, this light is incident on each pixel 23 in the display area 22 and passes through the red (R) or green (G) color filters 24R and 24G constituting the first filter group 61.
On the other hand, the second backlight 43 emits blue (B) and cyan (C) light. Then, this light enters the second light guide part 45 of the planar light guide plate 41, passes through the second leading light part 451 and the second sub light guide part 452 of the second light guide part 45, and the liquid crystal by the liquid crystal 30. Pass the shutter. Thereafter, this light is incident on each pixel 23 of the display area 22 and passes through the blue (B) or cyan (C) color filters 24B and 24C constituting the second filter group 62.

According to this embodiment, there are the following effects.
(1) Only the light emitted from the first backlight 42 is incident on the red (R) and green (G) color filters 24R and 24G constituting the first filter group 61, and the second filter group 62 is Only the light emitted from the second backlight 43 is incident on the blue (B) and cyan (C) color filters 24B and 24C.
Here, the first backlight 42 includes a plurality of red (R) and green (G) LEDs 421 and 422, and the second backlight 43 includes a plurality of blue (B) and cyan (C) LEDs 431 and 432. Configured. As a result, the light attenuated or blocked in each of the color filters 24R, 24B, 24G, and 24C can be reduced, the light use efficiency of the backlights 42 and 43 can be improved to approximately ½, and the power consumption can be reduced. .

(2) Even if the red (R) and green (G) color filters 24R and 24G constituting the first filter group 61 have a characteristic of transmitting blue light and cyan light to some extent, the blue light and cyan Since the color light does not physically enter the first filter group 61, blue light and cyan light are not emitted from the first filter group 61.
Further, even if the blue (B) and cyan (C) color filters 24B and 24C constituting the second filter group 62 have a characteristic of transmitting red light and green light to some extent, the red light and green light are Since the light does not physically enter the second filter group 62, red light and green light are not emitted from the second filter group 62.
Therefore, regardless of the light transmission characteristics of the color filters 24R, 24B, 24G, and 24C, it is possible to suppress color mixing and improve color reproducibility.

<2. Second Embodiment>
FIG. 6 is a schematic plan view of a display area 22A according to the second embodiment of the present invention.
In the present embodiment, the arrangement of four types of color filters 25R, 25G, 25B, and 25C having different light transmission characteristics of red (R), green (G), blue (B), and cyan (C) constituting the display area 22A. And the structure of 40 A of backlight units differs from 1st Embodiment.

That is, each pixel 23A is configured by arranging color filters 25R, 25B, 25G, and 25C in a stripe shape.
Here, the red (R) and green (G) color filters 25R and 25G are defined as a first filter group 61A, and the blue (B) and cyan (C) color filters 25B and 25C are defined as a second filter group 62A. Then, in each pixel 23A, the first filter group 61A and the second filter group 62A are arranged in the horizontal direction in FIG.

  In each first filter group 61A, the red (R) and green (G) color filters 25R, 25G are arranged side by side in the horizontal direction in FIG. Specifically, the red (R) color filter 25R is arranged on the left side, and the green (G) color filter 25G is arranged on the right side. The present invention is not limited to this, and the red (R) color filter 25R may be arranged on the right side, and the green (G) color filter 25G may be arranged on the left side.

  The first filter group 61A as described above is arranged in the vertical direction in FIG. 6 in the display region 22A. As a result, the red (R) and green (G) color filters 25R and 25G are arranged in two lines in a straight line in the vertical direction in FIG. That is, the first filter group 61A includes red (R) and green (G) color filters 25R and 25G for each column.

  In each second filter group 62A, blue (B) and cyan (C) color filters 25B and 25C are arranged side by side in the horizontal direction in FIG. Specifically, the blue (B) color filter 25B is arranged on the left side, and the cyan (C) color filter 25C is arranged on the right side. Not limited to this, the blue (B) color filter 25B may be arranged on the right side, and the cyan (C) color filter 25C may be arranged on the left side.

  The second filter group 62A as described above is arranged side by side in the vertical direction in FIG. 6 in the display region 22A. As a result, the blue (B) and cyan (C) color filters 25B and 25C are arranged in two lines in a straight line in the vertical direction in FIG. That is, the second filter group 62A is composed of blue (B) and cyan (C) color filters 25B and 25C for each column.

FIG. 7 is a schematic plan view and a side view showing the configuration of the backlight unit 40A.
The backlight unit 40A has a substantially rectangular planar light guide plate 41 and a first sub-light source as a first sub-light source provided along two opposite sides of the planar light guide plate 41 in the vertical direction in FIG. A backlight 42 and a second backlight 43 as a second sub-light source. In addition, the specific structure of the backlight unit 40A is the same as that of the backlight unit 40 of the first embodiment.

FIG. 8 is a schematic plan view and a side view showing a state in which the backlight unit 40A is superimposed on the display region 22A.
Each first sub light guide 442 of the first light guide 44 extends along the back surface of the first filter group 61A arranged in a straight line. The second sub light guide 452 of the second light guide 45 extends along the back surface of the second filter group 62A arranged in a straight line.

  Therefore, according to the present embodiment, there are the same effects as in the first embodiment.

<3. Third Embodiment>
FIG. 9 is a schematic plan view and a side view of a backlight unit 40B according to the third embodiment of the present invention.
In the present embodiment, the configurations of the first backlight 42B and the second backlight 43B are different from those of the first embodiment.
That is, the first backlight 42B includes a cylindrical fluorescent tube 421B that emits red light by appropriately selecting a phosphor and a cylindrical fluorescent tube 422B that emits green light. The second backlight 43B includes a cylindrical fluorescent tube 431B that emits blue light by appropriately selecting a phosphor and a cylindrical fluorescent tube 432B that emits cyan light. These fluorescent tubes 421B, 422B, 431B, and 432B are cold cathode fluorescent tubes. However, the present invention is not limited to this, and a hot cathode fluorescent tube may be used.

  Therefore, according to the present embodiment, there are the same effects as in the first embodiment.

<4. Fourth Embodiment>
FIG. 10 is a schematic plan view and a side view of a backlight unit 40C according to the fourth embodiment of the present invention.
In the present embodiment, the configurations of the first backlight 42C and the second backlight 43C are different from those of the first embodiment.
That is, the first backlight 42C is a cold cathode fluorescent tube that emits red light and green light by separately applying phosphors. Specifically, the first backlight 42 </ b> C has a cylindrical shape extending in the vertical direction in FIG. 10, and has a left side portion coated with a phosphor emitting red light and a right side portion coated with a phosphor emitting green light. And are painted separately.
The second backlight 43C is a cold cathode fluorescent tube that emits blue light and cyan light by separately applying phosphors. Specifically, the second backlight 43C has a cylindrical shape extending in the vertical direction in FIG. 10, and a left side portion coated with a phosphor emitting blue light and a right side coated with a phosphor emitting cyan light. It is painted separately into parts.
The first backlight 42C and the second backlight 43C are not limited to cold cathode fluorescent tubes, and hot cathode fluorescent tubes may be used.

  Therefore, according to the present embodiment, there are the same effects as in the first embodiment.

<5. Fifth Embodiment>
FIG. 11 is a block diagram of a control circuit 80 that controls the backlight unit 40 according to the first embodiment of the present invention.

  The control circuit 80 includes a first sensor 71 as a first detection means, a second sensor 72 as a second detection means, a controller 81, and a PWM control circuit 82.

FIG. 12 is a schematic plan view and a side view showing a state in which the first sensor 71 and the second sensor 72 of the backlight unit 40 are attached.
As shown in FIG. 12, the first sensor 71 is provided on the surface of the first light guide 44 at the upper end of the planar light guide plate 41 and has a predetermined wavelength band corresponding to the light transmission characteristics of the first filter group 61. Detect the amount of light. Specifically, the first sensor 71 detects the amounts of light in the wavelength bands of red light and green light and outputs them as detection signals.

FIG. 13 is a plan view of the first sensor 71.
The first sensor 71 includes a red light sensor 711 as a plurality of red light detection means for detecting red light and a green light sensor 712 as a plurality of green light detection means for detecting green light in 2 rows and 7 columns. They are arranged alternately in a matrix. Specifically, the red light sensor 711 and the green light sensor 712 are alternately arranged in the row direction and the column direction. The reason why the red light sensor 711 is arranged in this way is that, for example, even if dust adheres to the surface of a certain red light sensor 711, the detection accuracy is lowered by the function of another red light sensor 711. Is to prevent. The arrangement of the green light sensor 712 is also the same reason.

  As shown in FIG. 12, the second sensor 72 is provided on the surface of the second light guide 45 at the lower end of the planar light guide plate 41, and has a wavelength band in a predetermined range corresponding to the light transmission characteristics of the second filter group 62. The amount of light is detected. Specifically, the second sensor 72 detects the amount of light in the wavelength band of blue light and cyan light and outputs it as a detection signal.

FIG. 14 is a plan view of the second sensor 72.
The second sensor 72 includes a blue light sensor 721 as a plurality of blue light detection means for detecting blue light and a cyan light sensor 722 as a plurality of cyan light detection means for detecting cyan light in 2 rows and 7 columns. They are arranged alternately in a matrix. Specifically, the blue light sensor 721 and the cyan light sensor 722 are alternately arranged in the row direction and the column direction. The reason why the blue light sensor 721 and the cyan light sensor 722 are arranged in this way is to prevent the detection accuracy from being lowered similarly to the arrangement of the red light sensor 711 and the green light sensor 712.

The controller 81 outputs a control signal to the PWM control circuit 82 based on the detection signals from the first sensor 71 and the second sensor 72 based on the set values of the respective colors.
Specifically, the controller 81 receives light intensity setting values for white (W), red (R), green (G), blue (B), and cyan (C).

As described above, the first backlight 42 includes the LED 421 as a red light source that emits red light, and the LED 422 as a green light source that emits green light.
The second backlight 43 includes an LED 431 serving as a blue light source that emits blue light, and an LED 432 serving as a cyan light source that emits cyan light.

  Based on the set values of white (W), red (R), green (G), blue (B), and cyan (C), the controller 81 determines red (R), green (G), blue (B) and cyan (C) color control signals are generated and output to the PWM control circuit 82. At this time, the red (R) control signal is corrected based on the amount of red light detected by the red light sensor 711, and green (G) based on the amount of green light detected by the green light sensor 712. The control signal is corrected. Further, the blue (B) control signal is corrected based on the blue light amount detected by the blue light sensor 721, and the cyan (C) control signal is corrected based on the cyan light amount detected by the cyan light sensor 722. Correct the control signal.

  The PWM control circuit 82 modulates the pulse width based on the control signal from the controller 81, thereby controlling the current value flowing through the LEDs 421, 422, 431, 432. That is, the current value of the LED 421 that emits red light is controlled based on the red (R) control signal, and the current value of the LED 422 that emits green light is controlled based on the green control signal. Further, the current value of the LED 431 that emits blue light is controlled based on the blue (B) control signal, and the current value of the LED 432 that emits cyan light is controlled based on the cyan (C) control signal.

  That is, the controller 81 and the PWM control circuit 82 described above control the first backlight 42 based on the light amount detected by the first sensor 71, and perform the second operation based on the light amount detected by the second sensor 72. The backlight 43 is controlled. Specifically, the LED 421 is controlled based on the amount of red light detected by the red light sensor 711, and the LED 422 is controlled based on the amount of green light detected by the green light sensor 712. Further, the LED 431 is controlled based on the amount of blue light detected by the blue light sensor 721, and the LED 432 is controlled based on the amount of cyan light detected by the cyan light sensor 722.

According to this embodiment, in addition to the effects (1) and (2) described above, the following effects can be obtained.
(3) A first sensor 71 that detects a light amount in a predetermined wavelength band corresponding to the light transmission characteristics of the first filter group 61, and a light amount in a wavelength band in a predetermined range corresponding to the light transmission characteristics of the second filter group 62. And a second sensor 72 for detection. That is, the sensors 71 and 72 for detecting a predetermined wavelength band corresponding to the filter groups 61 and 62 are provided. Therefore, the function of the optical sensor does not become overspec, and the cost can be reduced.

  (4) The first sensor 71 detects the amount of light in the wavelength band of red light and green light emitted from the first backlight 42, and the second sensor 72 detects blue light emitted from the second backlight 43 and The amount of light in the wavelength band of cyan light was detected, and the first and second backlights 42 and 43 were controlled based on the amount of light detected by the first and second sensors 71 and 72. Therefore, even if the characteristics of the backlights 42 and 43 change due to the ambient temperature of the backlights 42 and 43 and the heat generation of the backlights 42 and 43 themselves, the change in the characteristics can be detected and feedback controlled, so the display color Balance can be maintained properly.

  (5) The first backlight 42 is configured by including the red LED 421 and the green LED 422, the second backlight 43 is configured by including the blue LED 431 and the cyan LED 432, and the light sources of these four colors are used. The control circuit 80 individually controlled. Therefore, the balance of the display color can be finely adjusted.

<6. Sixth Embodiment>
FIG. 15 is a schematic plan view of a display area 22E according to the sixth embodiment of the present invention.
In the present embodiment, the arrangement of four types of color filters 26B, 26G, 26C, and 26R having different light transmission characteristics of blue (B), green (G), cyan (C), and red (R) constituting the display region 22E. The configuration of the backlight unit 40E and the structures of the first sensor 71E and the second sensor 72E are different from those of the fifth embodiment.

That is, each pixel 23E is configured by arranging these color filters 26B, 26G, 26C, and 26R in a stripe shape.
Here, the blue (B) and green (G) color filters 26B and 26G are defined as a first filter group 61E, and the cyan (C) and red (R) color filters 26C and 26R are defined as a second filter group 62E. Then, the first filter group 61E and the second filter group 62E are arranged in the horizontal direction in FIG.

  In each first filter group 61E, the blue (B) and green (G) color filters 26B and 26G are arranged side by side in the horizontal direction in FIG. Specifically, the blue (B) color filter 26B is arranged on the left side, and the green (G) color filter 26G is arranged on the right side. The present invention is not limited to this, and the blue (B) color filter 26B may be arranged on the right side, and the green (G) color filter 26G may be arranged on the left side.

  The first filter group 61E as described above is arranged side by side in the vertical direction in FIG. 15 in the display region 22E. As a result, the blue (B) and green (G) color filters 26B and 26G are arranged in two lines in a straight line in the vertical direction in FIG. That is, the first filter group 61E is composed of blue (B) and green (G) color filters 26B and 26G for each column.

  In each second filter group 62E, cyan (C) and red (R) color filters 26C and 26R are arranged side by side in the horizontal direction in FIG. Specifically, a cyan (C) color filter 26C is disposed on the left side, and a red (R) color filter 26R is disposed on the right side. The present invention is not limited to this, and the cyan (C) color filter 26C may be arranged on the right side, and the red (R) color filter 26R may be arranged on the left side.

  The second filter group 62E as described above is arranged side by side in the vertical direction in FIG. 15 in the display region 22E. Thus, the cyan (C) and red (R) color filters 26C and 26R are arranged in two lines in a straight line in the vertical direction in FIG. That is, the second filter group 62E is composed of cyan (C) and red (R) color filters 26C and 26R for each column.

FIG. 16 is a schematic plan view and a side view showing the configuration of the backlight unit 40E.
The backlight unit 40E includes a substantially rectangular planar light guide plate 41, and a first backlight 42E and a second backlight 42E provided along two sides of the planar light guide plate 41 facing each other in FIG. And a backlight 43E. In addition, the specific structure of the backlight unit 40E is the same as that of the backlight unit 40 of the first embodiment.

The first backlight 42E is configured by alternately arranging a plurality of blue (B) LEDs 423 and green (G) LEDs 424. Thereby, the first backlight 42E emits blue light and green light.
The second backlight 43E includes a plurality of red (R) LEDs 433 and cyan (C) LEDs 434 arranged alternately. Thereby, the second backlight 43E emits red light and cyan light.

FIG. 17 is a plan view of the first sensor 71E.
The first sensor 71E includes a plurality of red light sensors 713 that detect red light and a plurality of cyan light sensors 714 that detect cyan light, which are alternately arranged in a matrix of 2 rows and 7 columns.

FIG. 18 is a plan view of the second sensor 72E.
The second sensor 72E includes a plurality of blue light sensors 723 that detect blue light and a plurality of green light sensors 724 that detect green light, which are alternately arranged in a matrix of 2 rows and 7 columns.

FIG. 19 is a schematic plan view and a side view showing a state in which the backlight unit 40E is overlaid on the display region 22E.
Each first sub light guide portion 442 of the first light guide portion 44 extends along the back surface of the first filter group 61E arranged in a straight line. The second sub light guide 452 of the second light guide 45 extends along the back surface of the second filter group 62E arranged in a straight line.

  Therefore, according to the present embodiment, there are the same effects as in the fifth embodiment.

<7. Application example>
(1) In each of the above-described embodiments, the first filter group 61, 61A is composed of the red (R) and green (G) color filters 24R, 25R, 24G, 25G, and the second filter group 62, 62A is blue. (B) and cyan (C) color filters 24B, 25B, 24C, and 25C are used, but the present invention is not limited to this. That is, the first filter group may be composed of red (R) and cyan (C) color filters, and the second filter group may be composed of blue (B) and green (G) color filters. Alternatively, the first filter group may be configured with red (R) and blue (B) color filters, and the second filter group may be configured with green (G) and cyan (C) color filters.

  (2) In each of the above-described embodiments, the pixels 23 and 23A are provided with four color filters 24R, 25R, 24G, 25G, 24B of red (R), green (G), blue (B), and cyan (C). Although it is configured with 25B, 24C, and 25C, it is not limited to this. That is, each pixel may be constituted by three types of color filters of red (R), green (G), and blue (B).

  In this case, the first filter group may be composed of blue (B) and green (G) color filters, and the second filter group may be composed of red (R) color filters. Alternatively, the first filter group may be configured with red (R) and green (G) color filters, and the second filter group may be configured with blue (B) color filters. Alternatively, the first filter group may be configured with red (R) and blue (B) color filters, and the second filter group may be configured with green (G) color filters.

(3) In the first sensor 71 of the fifth embodiment described above, the red light sensor 711 and the green light sensor 712 are alternately arranged in a matrix of 2 rows and 7 columns. As shown, it may be arranged in a matrix of 4 rows and 7 columns. If it does in this way, the tolerance with respect to adhesion of dust of the 1st sensor can further be improved.
Similarly, in the second sensor 72, the blue light sensor 721 and the cyan light sensor 722 are alternately arranged in a matrix of 2 rows and 7 columns, but not limited to this, as shown in FIG. They may be arranged in a matrix of 7 rows.
Further, although not shown, the optical sensors 713, 714, 723, and 724 may be similarly arranged in 4 rows and 7 columns for the first sensor 71E and the second sensor 72E of the sixth embodiment.

  (4) In the above-described embodiments, cyan (C) LEDs 432 and 434 that emit cyan are used. Instead, green (G) LEDs (G) 422 and 424 that emit green light are used. It may be used.

  (5) Instead of the cyan (C) color filters 24R and 25R that are complementary colors of red (R) in each of the above-described embodiments, any one of the complementary color filters of green (G) and blue (B) You may comprise.

<8. Electronic equipment>
Next, an electronic apparatus to which the electro-optical device 1 according to the above-described embodiments and application examples is applied will be described.
FIG. 22 is a perspective view illustrating a configuration of a mobile phone to which the electro-optical device 1 is applied. A cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the electro-optical device 1 as a display unit. By operating the scroll button 3002, the screen displayed on the electro-optical device 1 is scrolled.

  As an electronic apparatus to which the electro-optical device 1 is applied, in addition to the one shown in FIG. 22, a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct-view type video tape recorder, a car navigation device, a pager, an electronic notebook, Examples include a calculator, a word processor, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel. The electro-optical device 1 described above can be applied as a display unit of these various electronic devices.

1 is a perspective view illustrating an overall configuration of an electro-optical device according to a first embodiment of the invention. It is ZZ 'sectional drawing of FIG. 3 is a schematic plan view of a display area of the electro-optical device. FIG. (A) is a schematic plan view of a backlight unit constituting the electro-optical device, and (b) is a side view thereof. (A) is a schematic plan view showing a state in which the backlight unit is overlaid on the display area of the electro-optical device, and (b) is a side view thereof. It is a schematic plan view of the display area which concerns on 2nd Embodiment of this invention. (A) is a schematic plan view of a backlight unit constituting the electro-optical device, and (b) is a side view thereof. (A) is a schematic plan view showing a state in which the backlight unit is overlaid on the display area of the electro-optical device, and (b) is a side view thereof. (A) is a schematic plan view of the backlight unit which concerns on 3rd Embodiment of this invention, (b) is the side view. (A) is a schematic plan view of the backlight unit which concerns on 4th Embodiment of this invention, (b) is the side view. FIG. 10 is a block diagram of a control circuit of an electro-optical device according to a fifth embodiment of the invention. (A) is a schematic plan view showing a state in which the first sensor and the second sensor of the backlight unit constituting the electro-optical device are attached, and (b) is a side view thereof. FIG. 4 is a plan view of a first sensor of the electro-optical device. FIG. 6 is a plan view of a second sensor of the electro-optical device. FIG. 10 is a schematic plan view of a display area of an electro-optical device according to a sixth embodiment of the invention. (A) is a schematic plan view showing a state in which the first sensor and the second sensor of the backlight unit constituting the electro-optical device are attached, and (b) is a side view thereof. FIG. 4 is a plan view of a first sensor of the electro-optical device. FIG. 6 is a plan view of a second sensor of the electro-optical device. (A) is a schematic plan view showing a state in which the backlight unit is overlaid on the display area of the electro-optical device, and (b) is a side view thereof. FIG. 6 is a plan view of a first sensor of an electro-optical device according to an application example of the invention. FIG. 6 is a plan view of a first sensor of an electro-optical device according to an application example of the invention. It is a perspective view which shows the structure of the mobile telephone to which the said electro-optical apparatus is applied. It is a figure which shows the light transmission characteristic of the color filter which comprises the electro-optical apparatus which concerns on a prior art example. It is a figure which shows the luminance characteristic of 3 color LED which concerns on a prior art example. It is a figure which shows the luminance characteristic of the cold cathode tube which concerns on a prior art example. It is a luminance characteristic of each sub pixel at the time of using 3 color LED which concerns on a prior art example as a backlight. It is a brightness | luminance characteristic of each sub pixel at the time of using the cold cathode fluorescent tube which concerns on a prior art example as a backlight.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electro-optical device, 22, 22A ... Display area (display part), 23, 23A ... Pixel, 24R, 24G, 24B, 24C, 25R, 25G, 25B, 25C ... Color filter, 41 ... Planar light guide plate (guide) Light part), 42, 42B, 42C ... Backlight (first sub light source), 43, 43B, 43C ... Back light (second sub light source), 44 ... First light guide part, 45 ... Second light guide part, 61, 61A ... first filter group, 62, 62A ... second filter group, 71, 71E ... first sensor (first detection means), 72, 72E ... second sensor (second detection means), 81 ... controller ( Control means), 82 ... PWM control circuit (control means), 421 ... red LED (red light source), 422 ... green LED (green light source), 423 ... blue LED (blue light source), 424 ... green LED ( Green light source), 431 Blue LED (blue light source), 432 ... Cyan LED (cyan color light source), 433 ... Red LED (red light source), 434 ... Cyan LED (cyan color light source), 711 ... Red light sensor (red light detection means) 712 ... Green light sensor (green light detection means), 713 ... Red light sensor (red light detection means), 714 ... Cyan light sensor (cyan light detection means), 721 ... Blue light sensor (blue light detection means), 722 ... Cyan light sensor (cyan light detection means), 723 ... Blue light sensor (blue light detection means), 724 ... Green light sensor (green light detection means).

Claims (8)

A display unit in which a plurality of pixels are arranged; a light source; and a light guide unit that guides light emitted from the light source to the pixels, wherein the pixels include a plurality of color filters having different light transmission characteristics. An electro-optical device,
The plurality of color filters are provided separately in a first filter group and a second filter group,
The light source includes a first sub-light source and a second sub-light source having different luminance characteristics,
The light guide unit guides the light emitted from the first sub-light source to the first filter group, and the first light guide unit guides the light emitted from the second sub-light source to the second filter group. And an electro-optical device. The electro-optical device according to claim 1.
The first filter group includes a red color filter and a green color filter for each row or column.
The second filter group includes, for each row or column, a complementary color filter of red, green, and blue, and a blue color filter,
The electro-optical device, wherein the first sub-light source emits red light and green light, and the second sub-light source emits blue light and complementary color light. The electro-optical device according to claim 1,
The light guide is substantially rectangular,
The first sub light source and the second sub light source are provided along two opposite sides of the light guide unit,
The light guide unit includes: a first light guide unit that guides light emitted from the first sub-light source to the first filter group; and a second unit that guides light emitted from the second sub-light source to the second filter group. A light guide,
The first light guide section includes a first main light section extending along the first sub light source, and a plurality of first sub light guide sections extending at predetermined intervals in a direction orthogonal to the first main light section. With
The second light guide section includes a second main light section extending along the second sub light source, and a plurality of second sub light guide sections extending at predetermined intervals in a direction orthogonal to the second main light section. With
A second sub light guide unit of the second light guide unit is disposed between the first sub light guide units of the first light guide unit, and the second sub light guide units of the second light guide unit are arranged with each other. An electro-optical device, wherein a first sub light guide portion of the first light guide portion is disposed between the first light guide portion and the second light guide portion. The electro-optical device according to claim 1.
The first filter group is composed of two of red, green, and blue color filters, and the second filter group is composed of the remaining one color filter,
2. The electro-optical device according to claim 1, wherein the first sub-light source emits two of red light, green light, and blue light, and the second sub-light source emits the remaining one. The electro-optical device according to claim 1.
First detection means provided in the first light guide unit for detecting the amount of light in a predetermined wavelength band according to the light transmission characteristics of the first filter group;
An electro-optical device comprising: a second detection unit that is provided in the second light guide unit and detects a light amount in a predetermined wavelength band corresponding to a light transmission characteristic of the second filter group. The electro-optical device according to claim 5.
The first filter group includes a red color filter and a green color filter for each row or column.
The second filter group includes, for each row or column, a complementary color filter of red, green, and blue, and a blue color filter,
The first sub-light source emits red light and green light, the second sub-light source emits blue light and the complementary color light,
The first detection means detects the light quantity in the wavelength band of red light and green light, the second detection means detects the light quantity in the wavelength band of blue light and the complementary color light,
Control means for controlling the first sub-light source based on the amount of light detected by the first detection means and for controlling the second sub-light source based on the amount of light detected by the second detection means. An electro-optical device.   An electronic apparatus comprising the electro-optical device according to claim 1. An illumination device comprising: a light source; and a light guide unit that guides light emitted from the light source to a pixel,
The light source includes a first sub-light source and a second sub-light source having different luminance characteristics,
The light guide unit includes a first light guide unit that guides light emitted from the first sub-light source, and a second light guide unit that guides light emitted from the second sub-light source,
The light guide is substantially rectangular,
The lighting device according to claim 1, wherein the first sub-light source and the second sub-light source are provided along two opposite sides of the light guide unit.

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