TWI488296B - Organic electroluminescent display panel and manufacturing method thereof - Google Patents

Description

Organic electroluminescence display panel and method of manufacturing same

The present invention relates to a display panel and a method of fabricating the same, and more particularly to an organic electroluminescent display panel and a method of fabricating the same.

The information and communication industry has become the mainstream industry today, and its development is particularly important because the display panel is the communication interface between people and information. Among many kinds of display panels, organic electroluminescent display panels have many characteristics and advantages, such as self-luminous, wide viewing angle, fast response time, low operating voltage, low temperature operation, and high photoelectric conversion efficiency. It is generally expected to be the mainstream of next generation display panels.

The organic electroluminescence display panel can be divided into an upward illumination type organic electroluminescence display panel and a downward illumination type organic electroluminescence display panel according to the direction in which the light is emitted.

1 is a partial cross-sectional view of a conventional electroluminescent display panel of an upward illumination type, and FIG. 2 is a partial cross-sectional view of a conventional electroluminescent display panel of a conventional downward illumination type. Referring first to FIG. 1 , the organic light-emitting display panel 100 of the upward illumination type includes a first substrate 110 , a pixel 120 , a pixel definition layer 130 , a light-emitting layer 140 , a transparent cathode 150 , and a color filter 160 . The pixel 120 is disposed on the first substrate 110. The pixel 120 includes a reflective pixel electrode 121 and a switching element 122. The pixel defining layer 130 is disposed on the pixel 120 and has an opening 130a into which the light emitting layer 140 is filled. In the opening 130a. The transparent cathode 150 is disposed on the pixel defining layer 130 and the light emitting layer 140. The color filter 160 is disposed on the transparent cathode layer 150. The color filter includes a second substrate 161, a color filter film 162, and a black matrix 163. The color filter film 162 is substantially aligned with the opening 130a of the pixel defining layer 130.

In the organic light-emitting display panel 100 of the upward light-emitting type, part of the light L emitted from the light-emitting layer 140 passes directly through the transparent cathode 150, and the light L of the other portion is reflected and reflected by the reflective pixel electrode 121. Transparent electrode layer 150. In other words, the light L passing through the transparent cathode 150 passes through the color filter 160. Therefore, in the organic light-emitting display panel 100 of the upward light-emitting type, the black matrix 163 in the color filter 160 can be used to reduce the reflection of the ambient light, and the display panel can be improved by the color filter film 162. Color Saturation.

Referring to FIG. 2 , the organic light-emitting display panel 200 of the downward illumination type includes a substrate 210 , a pixel 220 , a transparent pixel electrode 221 , a switching element 222 , a pixel definition layer 230 , a light-emitting layer 240 , and a reflective cathode 250 . . The pixel 220 is disposed on the substrate 210, and the pixel 220 includes a switching element 222 and a transparent pixel electrode 221. The pixel defining layer 230 is disposed on the pixel 220 and has an opening 230a into which the light emitting layer 240 is filled. The reflective cathode 250 is disposed on the pixel defining layer 230 and the light emitting layer 240. In the organic electroluminescent display panel 200 of the downward illumination type, part of the light L emitted from the light-emitting layer 240 passes directly through the transparent pixel electrode 221, and the other portion of the light L is reflected and reflected by the reflective cathode 250. Transparent pixel electrode 221. In other words, passing through the transparent pixel electrode 221 Light L will pass through the substrate 210.

If it is desired to further increase the color saturation of the organic electroluminescent display panel 200 of the downward illumination type through the color filter film 162, a color filter film may be formed on the outer surface of the substrate 210, or formed in the pixel 220. The color filter film was previously formed on the inner surface of the substrate 210. If a color filter film is formed on the outer surface of the substrate 210, since the light-emitting layer 240 and the color filter film are spaced apart from each other by the substrate 210, part of the light L emitted from the light-emitting layer 240 is not directly used through the color filter film. It has been observed that the user has a limitation of viewing angle when viewing the display screen. If a color filter film is formed on the inner surface of the substrate 210, a black matrix needs to be formed before the pixel 220 is formed. However, the material of the current black matrix is mainly made of resin, and its heat-resistant temperature is not enough to withstand the high temperature of the subsequent production of the pixel 220. Therefore, it is difficult to produce a color filter in an organic electroluminescence display panel of a downward illumination type.

The invention provides an organic electroluminescent display panel and a manufacturing method thereof. The organic electroluminescent display panel can integrate an anti-reflection layer and a color filter under the pixel array.

The present invention provides an organic electroluminescent display panel comprising a substrate, an antireflection layer having a multilayer structure, a plurality of color filter patterns, a pixel array, a plurality of organic electroluminescent patterns, and a second electrode. The antireflection layer of the multilayer structure is disposed on the substrate, and the reflective layer of the multilayer structure has a plurality of openings. A plurality of color filter patterns are disposed in the openings. The pixel array is disposed on the anti-reflection layer of the multilayer structure and the color filter pattern. Among them, painting The prime array includes a plurality of first electrodes arranged in an array. The plurality of organic electroluminescent light patterns are disposed on the first electrode, and the second electrode is disposed on the organic electroluminescent light pattern.

In an embodiment of the invention, the antireflection layer of the multilayer structure of the organic electroluminescent display panel comprises a first metal layer, a phase shift layer and a second metal layer. The first metal layer is disposed on the substrate, and the phase shift layer is located between the first metal layer and the second metal layer.

In an embodiment of the invention, the antireflection layer of the multilayer structure of the organic electroluminescent display panel comprises a metal layer, a first dielectric layer and a second dielectric layer. The metal layer is disposed on the substrate, and the first dielectric layer is between the metal layer and the second dielectric layer.

In an embodiment of the invention, the opening of the reflective layer of the multilayer structure of the organic electroluminescent display panel comprises a plurality of first openings, a plurality of second openings, and a plurality of third openings. The color filter pattern includes a plurality of first color filter patterns, a plurality of second color filter patterns, and a plurality of third color filter patterns. Each of the first color filter patterns is respectively filled in one of the first openings, and each of the second color filter patterns is respectively filled in one of the second openings, and each of the third color filter patterns is respectively filled in one of the third openings. .

In an embodiment of the invention, the first color filter pattern of the color filter pattern of the organic electroluminescent display panel is a red filter pattern, and the second color filter pattern is a green filter pattern, and the third color The filter pattern is a blue filter pattern. And each of the first openings of the reflective layer of the multi-layer structure is smaller than the size of each of the second openings, and the size of each of the second openings is smaller than the size of each of the third openings.

In an embodiment of the invention, the organic electroluminescent display surface The organic electroluminescent light pattern of the panel includes a plurality of red organic electroluminescent light patterns, a plurality of green organic electroluminescent light patterns, and a plurality of blue organic electroluminescent light patterns. The red organic electroluminescent light pattern corresponds to a red filter pattern configuration, the green organic electroluminescent light pattern corresponds to a green filter pattern configuration, and the blue organic electroluminescent light pattern corresponds to a blue filter pattern configuration.

In an embodiment of the present invention, the pixel array of the organic electroluminescent display panel further includes a plurality of scan lines, a plurality of data lines, a plurality of switching transistors, a plurality of driving transistors, and a capacitor. One of the gates of each of the switching transistors is electrically connected to the corresponding scan line, and one source of each of the switching transistors is electrically connected to the corresponding data line. One of the gates of each of the driving transistors is electrically connected to one of the corresponding switching transistors, and one of the driving transistors is electrically connected to the corresponding first electrode, and one of the driving transistors is one of the sources. The pole is coupled to a voltage source. A capacitor is electrically coupled between the source of the corresponding driving transistor and the drain of the corresponding switching transistor.

In an embodiment of the invention, the antireflection layer of the multilayer structure of the organic electroluminescent display panel has at least one metal layer, and the source of each switching transistor is electrically connected to at least one metal layer.

In an embodiment of the invention, the organic electroluminescent display panel further includes an insulating layer overlying the antireflection layer of the multilayer structure, wherein the insulating layer is between the antireflection layer of the multilayer structure and the pixel array.

The present invention provides a method of manufacturing an organic electroluminescent display panel, and the flow of the manufacturing method is as follows. First, a multi-layer anti-reflection layer is formed on a substrate, and the multi-layer anti-reflection layer has a plurality of openings. Next, a plurality of color filter patterns are formed in the plurality of openings. after that, A pixel array is formed on the antireflection layer of the multilayer structure and the color filter pattern, wherein the pixel array includes a plurality of first electrodes arranged in an array. Next, a plurality of organic electroluminescent light patterns are formed on the first electrode. Thereafter, a second electrode is formed on the organic electroluminescent light pattern.

In an embodiment of the present invention, in the method for fabricating an organic electroluminescent display panel, the method of forming an antireflection layer having a multilayer structure includes forming a first metal layer on the substrate and then forming a first metal layer A phase shifting layer is formed thereon, and then a second metal layer is formed on the phase shifting layer.

In an embodiment of the present invention, in the method for fabricating an organic electroluminescent display panel, the method for forming an antireflection layer of a multilayer structure includes: forming a metal layer on the substrate; and forming a first layer on the metal layer A dielectric layer is then formed on the first dielectric layer to form a second dielectric layer.

In an embodiment of the invention, in the method of fabricating an organic electroluminescent display panel, the plurality of openings includes a plurality of first openings, a plurality of second openings, and a plurality of third openings. And forming a color filter pattern, comprising: forming a plurality of first color filter patterns, a plurality of second color filter patterns, and a plurality of third color filter patterns, wherein each of the first color filter patterns is filled therein In a first opening, each of the second color filter patterns is filled into one of the second openings, and each of the third color filter patterns is filled into one of the third openings.

In an embodiment of the invention, in the method for manufacturing an organic electroluminescent display panel, the first color filter pattern of the color filter pattern is a red filter pattern, and the second color filter pattern is a green filter. The pattern, the third color filter pattern is a blue filter pattern. And each of the first openings of the reflective layer of the multi-layer structure is smaller than the size of each of the second openings, and the size of each of the second openings is small The size of each third opening.

In an embodiment of the present invention, in the method for fabricating an organic electroluminescent display panel, the method of forming an organic electroluminescent light pattern includes: forming a plurality of red organic electroluminescent light patterns, and a plurality of green organic electroluminescent excitation lights A pattern and a plurality of blue organic electroluminescent patterns. The red organic electroluminescent light pattern corresponds to the red filter pattern configuration, the green organic electroluminescent light pattern corresponds to the green filter pattern configuration, and the blue organic electroluminescent light pattern corresponds to the blue filter pattern configuration.

In an embodiment of the present invention, in the method for fabricating an organic electroluminescent display panel, the method for forming a pixel array further includes: forming a plurality of scan lines, forming a plurality of data lines, and forming a plurality of switching transistors . One of the gates of each of the switching transistors is electrically connected to the corresponding scan line, and one source of each of the switching transistors is electrically connected to the corresponding data line. The method for forming a pixel array further includes: forming a plurality of driving transistors, wherein one of the gates of each of the driving transistors is electrically connected to one of the corresponding switching transistors, and one of the driving transistors has a drain The corresponding first electrode is electrically connected, and one source of each driving transistor is coupled to a voltage source. And forming a capacitor, wherein the capacitor is electrically coupled between the source of the corresponding driving transistor and the drain of the corresponding switching transistor.

In an embodiment of the invention, in the method for manufacturing an organic electroluminescent display panel, the antireflection layer of the multilayer structure has at least one metal layer, and the source of each switching transistor and the electrical layer of at least one layer are electrically connection.

In an embodiment of the invention, the method for fabricating the organic electroluminescent display panel further includes: forming an insulating layer to cover the multilayer structure On the antireflection layer, the insulating layer is located between the antireflection layer of the multilayer structure and the pixel array.

Based on the above, the organic electroluminescent display panel of the present invention has a color filter to filter ambient light, and a multi-layer anti-reflection layer is used to reduce reflection of ambient light on the organic electroluminescent display panel, thereby improving the display panel. Contrast.

The above described features and advantages of the present invention will be more apparent from the following description.

3 is a drive circuit diagram of an organic electroluminescence display panel according to a first embodiment of the present invention. Referring to FIG. 3, the driving circuit of this embodiment is, for example, a driving circuit of a 2T1C architecture. In detail, the driving circuit of the embodiment includes a driving transistor MP1, a switching transistor MP2, and a capacitor C. The gate G of the switching transistor MP2 is electrically connected to the corresponding scanning line SL, respectively, and the source of the transistor MP2 is switched. S is electrically connected to the corresponding data line DL, respectively. The gates G of the driving transistor MP1 are electrically connected to the drains D of the corresponding switching transistors MP2, respectively, and the drains D of the driving transistors MP1 are electrically connected to the anodes of the corresponding organic electroluminescent display units OEL, respectively. The source S of each of the driving transistors MP1 is coupled to the voltage source OVdd. The capacitor C is electrically coupled between the source S of the corresponding driving transistor MP1 and the drain D of the corresponding switching transistor MP2. In addition, the cathode of the organic electroluminescent display unit OEL is coupled to another voltage OVss. In this embodiment, the voltage level of the voltage source OVdd is higher than the voltage of the voltage OVss. Pressure level.

When the switching transistor MP2 is turned on, the data voltage transmitted via the data line DL is applied to the gate G of the driving transistor MP1. When the switching transistor MP2 is turned off, the data voltage applied to the gate G of the driving transistor MP1 is maintained by the capacitor C. Information on the voltage applied to the gate G of the driving transistor MP1 determine the drive transistor MP1 opening degree, and then control flows organic electroluminescent display unit driving the OEL current I _drive.

It should be noted that the present invention does not limit the number of transistors and capacitors in the driving circuit and the coupling manner. The designer can change the number of transistors, capacitors and coupling modes in the driving circuit according to actual application requirements.

4A to 4D are flowcharts showing the fabrication of the organic electroluminescent display panel according to the first embodiment of the present invention. The manufacturing process of the organic electroluminescent display panel of the first embodiment of the present invention mainly comprises the following steps. First, a multi-layer anti-reflection layer is formed on a substrate, and the anti-reflection layer of the multi-layer structure has a plurality of openings. Next, a plurality of color filter patterns are formed in the plurality of openings. Thereafter, a pixel array is formed on the antireflection layer of the multilayer structure and the color filter pattern, wherein the pixel array includes a plurality of first electrodes arranged in an array. Next, a plurality of organic electroluminescent light patterns are formed on the first electrode. Thereafter, a second electrode is formed on the organic electroluminescent light pattern. A flow chart for fabricating the organic electroluminescent display panel of the first embodiment of the present invention will be described in detail below with reference to FIGS. 4A to 4D.

Referring to FIG. 4A, a substrate 310 is first provided, and then a multi-layer anti-reflective layer 320 is formed on the substrate 310. When the multi-layer anti-reflective layer 320 is formed, a plurality of openings 321 are reserved in the anti-reflective layer 320. (Figure Only three are shown in 4A). In this embodiment, the substrate 310 may be made of glass, quartz or other light transmissive material.

In this embodiment, the anti-reflective layer 320 of the multilayer structure includes a first metal layer 320a, a phase shift layer 320b, and a second metal layer 320c. The first metal layer 320a is disposed on the substrate 310. The phase shift layer 320b is located between the first metal layer 320a and the second metal layer 320c. The material of the first metal layer 320a and the second metal layer 320c may be silver (Ag), aluminum (Al) or molybdenum (Mo), and the material of the phase shift layer 320b may be indium-tin oxide (Indium-Tin Oxide, ITO), other transparent conductive materials or other dielectric materials, but the invention is not limited thereto. In this embodiment, after the anti-reflection layer 320 of the multilayer structure is formed, an insulating layer 320d may be further formed on the anti-reflection layer 320 of the multilayer structure.

Thereafter, as shown in FIG. 4B, a pixel array 330 is formed on the insulating layer 320d. In general, the pixel array 330 includes a scan line, a data line, and a pixel, wherein the pixel is electrically connected to the corresponding scan line and the corresponding data line, and the pixel includes a transistor and a first electrode (not shown) ). For example, the aforementioned transistor includes a channel layer 332, a gate insulating layer 333, a gate G, a dielectric layer 334, a source S, and a drain D. In addition, the present embodiment can selectively form the first protective layer 335 and the second protective layer 336 on the transistor.

Taking the structure illustrated in FIG. 4B as an example, a channel layer 332 is first formed on the insulating layer 320d. The material of the channel layer 332 may be polysilicon or the like, and the channel layer 332 is in contact with the source S or the drain D. Zones 3321 and 3322 are heavily doped and may be doped depending on the type of channel layer material P-type doped material or n-type doped material. Next, a gate insulating layer 333 is overlaid on the channel layer 332, and then a gate G is formed on the gate insulating layer 333. The gate insulating layer 333 may be made of an inorganic material such as hafnium oxide, tantalum nitride or hafnium oxynitride, an organic material or a stacked layer containing an insulating material and other insulating materials.

Next, in order to protect the gate G, a dielectric layer 334 is formed over the gate G. Source S and drain D are then formed on this dielectric layer 334. The source S and the drain D are electrically connected to the channel layer 332. Finally, the first protective layer 335 and the second protective layer 336 are selectively formed on the dielectric layer 334 in this embodiment. The material of the first protective layer 335 and the second protective layer 336 may be an organic material such as polyester, polyethylene, cycloolefin, polyimide, polyamide, Polyalcohols, polyphenylenes, polyethers, polyketones or other suitable materials and combinations thereof are also made of stacked layers comprising insulating materials and other insulating materials.

Referring to FIG. 4C, the color filter pattern 340 is formed in the plurality of openings 321 of the anti-reflective layer 320 of the multilayer structure. In the present embodiment, the opening 321 includes a plurality of first openings 321a (only one is illustrated in FIG. 4C), a plurality of second openings 321b (only one is illustrated in FIG. 4C), and a plurality of third openings 321c ( Only one is shown in FIG. 4C, and the color filter pattern 340 includes a plurality of first color filter patterns 341, a plurality of second color filter patterns 342, and a plurality of third color filter patterns 343.

In FIG. 4C, the first color filter patterns 341 are respectively filled in one of them. In the first openings 321a, the second color filter patterns 342 are respectively filled in one of the second openings 321b, and the third color filter patterns 343 are respectively filled in one of the third openings 321c.

After the color filter pattern 340 is filled in each of the openings 321, a first electrode 331 is formed on the color filter pattern 340, and the first electrode 331 is connected to the drain D of the transistor. The material of the first electrode 331 may be Indium-Tin Oxide (ITO) or Indium-Zinc Oxide (IZO) or other transparent conductive material.

Referring next to FIG. 4D, an organic electroluminescent light pattern 350 is formed on the first electrode 331. In the present embodiment, the material of the organic electroluminescent light pattern 350 is Alq3, Almq3, Bebq2 or other suitable organic luminescent materials. The organic electroluminescent pattern 350 may be formed on the first electrode 331 by evaporation or other coating process. After the fabrication of the organic electroluminescent pattern 350 is completed, a second electrode 360 is formed to cover the organic electroluminescent pattern 350. In the present embodiment, the material of the second electrode 360 may be metal, and the metal is, for example, silver, aluminum, magnesium or an alloy thereof. The second electrode 360 can be deposited by evaporation, sputtering or other vapor deposition methods. However, the present embodiment does not limit the material of the second electrode 360 and the manner in which it is fabricated.

After the second electrode 360 is completed, the fabrication of the organic electroluminescent display panel 300 is initially completed. The film structure of the organic electroluminescent display panel 300 will be described in detail below with reference to FIG. 4D.

As shown in FIG. 4D, the organic electroluminescent display panel 300 of the present embodiment includes a substrate 310, a multi-layer anti-reflective layer 320, a plurality of color filter patterns 340, a pixel array 330, and a plurality of organic electrodes. Excitation light pattern 350 And a second electrode 360. The anti-reflective layer 320 of the multi-layer structure is disposed on the substrate 310, and the reflective layer of the multi-layer structure has a plurality of openings 321. The color filter pattern 340 is disposed in the openings 321 . The pixel array 330 is disposed on the anti-reflection layer 320 of the multilayer structure and the color filter pattern 340. The pixel array 330 includes a plurality of first electrodes 331 arranged in an array. Further, a plurality of organic electroluminescent light patterns 350 are disposed on the respective first electrodes 331 , and the second electrodes 360 are disposed on the organic electroluminescent light patterns 350 . An insulating layer 320d is disposed on the anti-reflective layer 320 of the multilayer structure to electrically isolate the channel layer 332 from the second metal layer 320c under the insulating layer 320d. In addition, the first electrode 331 of the transparent material allows the emitted light of the organic electroluminescent pattern 350 to be transmitted through the first electrode 331 when driven by current.

FIG. 5A is an anti-reflection layer 320 of the multilayer structure of FIG. 4D. Please refer to Figure 5A. When the ambient light R is irradiated to the anti-reflection layer 320, the reflected light is divided into R1 reflected by the first metal layer 320a and R2 reflected by the second metal layer 320c. The reflectance and transmittance of each metal layer are determined by the thickness of each metal layer. The phase difference between R1 and R2 is determined by the thickness of the phase shift layer 320b and the refractive index. Therefore, appropriately adjusting the thickness of the phase shift layer 320b and the refractive index can make the phase difference between R1 and R2 exactly 180 degrees. Thus, the reflected light R1 and R2 are destructively interfered and cancel each other, so that the reflection of the ambient light R on the organic electroluminescence display panel 300 can be eliminated, and the contrast of the organic electroluminescence display panel 300 can be improved.

FIG. 5B is an anti-reflection layer of a multilayer structure according to another embodiment of the present invention. The anti-reflective layer 320 of the multi-layer structure is not limited to the aforementioned first metal layer 322, a phase shift layer 320b and a second metal layer 320c. As shown in FIG. 5B, in another embodiment, the anti-reflective layer 420 of the multi-layer structure includes a metal layer 420a, a first dielectric layer 420b, and a second dielectric layer 420c. The metal layer 420a is disposed on the substrate 310. The first dielectric layer 420b is located between the metal layer 420a and the second dielectric layer 420c. The material of the metal layer 420a may be, for example, molybdenum (Mo), the material of the first dielectric layer 420b may be, for example, tantalum nitride (SiNx), and the material of the second dielectric layer 420c may be, for example, amorphous silicon. However, the invention is not limited thereto.

As described above, when the ambient light R is irradiated to the anti-reflection layer 420, the reflected light is divided into R3 reflected by the metal layer 420a and R4 reflected by the second dielectric layer 420c. The reflectivity and transmittance of each layer are determined by the thickness of each layer. The phase difference between R3 and R4 is determined by the thickness and refractive index of the first dielectric layer 420b. Therefore, appropriately adjusting the thickness of the first dielectric layer 420b and the refractive index can make the phase difference between R3 and R4 exactly 180 degrees. Thus, the reflected light R3 and R4 will have destructive interference and cancel each other out.

FIG. 6 is a partial top plan view of the organic electroluminescent display panel 300 of FIG. 4D. Please refer to Figure 6. In this embodiment, the first color filter pattern 341 is a red filter pattern, the second color filter pattern 342 is a green filter pattern, and the third color filter pattern 343 is a blue filter pattern. As shown in FIG. 6 , each of the first openings 321 a is smaller than the size of each of the second openings 321 b , and the size of each of the second openings 321 b is smaller than the size of each of the third openings 321 c .

Please refer to FIG. 4D and FIG. 6 simultaneously, the organic electroluminescent light of the embodiment The pattern 350 includes a plurality of red organic electroluminescent light patterns 351, a plurality of green organic electroluminescent light patterns 352, and a plurality of blue organic electroluminescent light patterns 353. Each of the red organic electroluminescent light patterns 351 is respectively disposed corresponding to one of the plurality of red filter patterns 341, and each of the green organic electroluminescent light patterns 352 is disposed corresponding to one of the plurality of green filter patterns 342, and each The blue organic electroluminescence pattern 353 is disposed corresponding to one of the plurality of blue filter patterns 343. Therefore, when the red organic electroluminescent light pattern 351, the green organic electroluminescent light pattern 352, and the blue organic electroluminescent light pattern 353 are driven by current to emit red, green, and blue light, red, green, and blue light are respectively worn. The corresponding red filter pattern 341, green filter pattern 342, and blue filter pattern 343 are passed to increase the color saturation of red, green, and blue light.

Since the organic electroluminescent light pattern 350 suitable for emitting different color lights has different lifetime decay speeds, in order to make the lifetime decay speeds of the organic electroluminescent light patterns 350 suitable for emitting different color lights tend to be uniform, the present embodiment is modified by driving. The current is adjusted as well as the size of the opening 321 . For example, if the red organic electroluminescent light pattern 351, the green organic electroluminescent light pattern 352, and the blue organic electroluminescent light pattern 353 are driven by the same driving current, the lifetime decay rate of the blue organic electroluminescent pattern 353 will be The lifetime decay rate is higher than the red organic electroluminescent pattern 351 and the green organic electroluminescent pattern 352, and the lifetime decay rate of the green organic electroluminescent pattern 352 is higher than the lifetime decay rate of the red organic electroluminescent pattern 351. At this time, if the red organic electroluminescence pattern 351, the green organic electroluminescence pattern 352, and the blue organic electroluminescence pattern are to be made The lifetime decay rate of the case 353 tends to be uniform, and the driving current for driving the blue organic electroluminescent pattern 353 must be lower than the driving current for driving the red organic electroluminescent pattern 351 and the green organic electroluminescent pattern 352. The driving current for driving the green organic electroluminescent pattern 352 is lower than the driving current for driving the red organic electroluminescent pattern 351. However, this method will cause the intensity of the red light, the green light and the blue light to be different. Therefore, the present embodiment controls the red light, the green light and the size through the size control of the first opening 321a, the second opening 321b and the third opening 321c. The intensity of blue light.

In addition, the reflection of the ambient light by the organic electroluminescent display panel can be mainly composed of four parts, which are respectively the reflection of the anti-reflection layer of the multi-layer structure and the first color filter pattern, the second color filter pattern, and the third color. The reflection of the filter pattern. As described above, the reflectance of the ambient light in the antireflection layer of the multilayer structure can be made close to zero by adjusting the thickness of each metal layer. In the present embodiment, the reflectances of the first color filter pattern 341, the second color filter pattern 342, and the third color filter pattern 343 are, for example, 20%, 50%, and 10%, respectively, and the first opening 321a, The size ratio of the second opening 321b to the third opening 321c is 10%, 20%, and 30%, respectively. Therefore, the overall reflectance of the organic electroluminescent display panel is about (20% × 10% + 50% × 20% + 10% × 30%) / 3 = 5%. Therefore, the organic electroluminescent display panel of the present invention can effectively eliminate the reflection of most of the ambient light, thereby improving the contrast thereof.

Figure 7 is a partial cross-sectional view showing an organic electroluminescent display panel according to another embodiment of the present invention. Referring to FIG. 7, the organic electroluminescent display panel 500 of the present embodiment is similar to the first embodiment, but the main difference between the two is The metal layer 510 of the multi-layer anti-reflective layer 320 is electrically connected to the source S of the switching transistor. In this embodiment, the metal layer 510 is electrically connected to the source S of the switching transistor to slow down the IR drop phenomenon of the voltage source OVdd. Further, if the metal layer 510 of the anti-reflective layer 320 of the multilayer structure is connected to the voltage source OVdd (having a fixed voltage level), the metal layer 510 has a shielding effect.

In summary, the organic electroluminescent display panel of the present invention includes a color filter under the pixel array. The color filter comprises an antireflection layer of a multilayer structure. Each color filter pattern in the color filter can filter the ambient light, and the anti-reflection layer of the multi-layer structure can reduce the reflection of the ambient light on the organic electroluminescent display panel, so that the organic electroluminescent display panel exhibits a good display. Picture.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Uplight-emitting organic electroluminescent display panel

110‧‧‧First substrate

120‧‧‧ pixels

121‧‧‧Reflective pixel electrode

122‧‧‧Switching elements

130‧‧‧ pixel definition layer

130a‧‧‧ openings

140‧‧‧Lighting layer

150‧‧‧Transparent cathode

160‧‧‧Color filters

161‧‧‧second substrate

162‧‧‧Color filter film

163‧‧‧Black matrix

200‧‧‧Down-emitting organic electroluminescent display panel

210‧‧‧Substrate

220‧‧‧ pixels

221‧‧‧Transparent pixel electrode

222‧‧‧Switching elements

230‧‧‧ pixel definition layer

230a‧‧‧ openings

240‧‧‧Lighting layer

250‧‧‧Reflective cathode

300‧‧‧Organic electroluminescent display panel

310‧‧‧Substrate

420, 320‧‧‧ multilayer structure anti-reflection layer

320a‧‧‧First metal layer

320b‧‧‧ phase offset layer

320c‧‧‧Second metal layer

320d‧‧‧Insulation

321‧‧‧ openings

321a‧‧‧first opening

321b‧‧‧ second opening

321c‧‧‧ third opening

330‧‧‧ pixel array

331‧‧‧First electrode

332‧‧‧channel layer

3321, 3322‧‧‧ contact area

333‧‧‧gate insulation

334‧‧‧ dielectric layer

335‧‧‧ first protective layer

336‧‧‧Second protective layer

340‧‧‧Color filter pattern

341‧‧‧First color filter pattern, red filter pattern

342‧‧‧Second color filter pattern, green filter pattern

343‧‧‧ Third color filter pattern, blue filter pattern

350‧‧‧Organic electroluminescent pattern

351‧‧‧Red organic electroluminescent pattern

352‧‧‧Green organic electroluminescent pattern

353‧‧‧Blue organic electroluminescent pattern

360‧‧‧second electrode

420b‧‧‧First dielectric layer

420c‧‧‧Second dielectric layer

500‧‧‧Organic electroluminescent display panel

420a, 510‧‧‧ metal layer

MP1‧‧‧ drive transistor

MP2‧‧‧Switching transistor

L‧‧‧Light

G‧‧‧ gate

S‧‧‧ source

D‧‧‧汲

C‧‧‧ capacitor

R‧‧‧ Ambient light

I _drive ‧‧‧ drive current

R1, R2, R3, R4‧‧‧ reflected light

OEL‧‧‧Organic Electroluminescent Display Unit

SL‧‧‧ scan line

DL‧‧‧ data line

1 is a partial cross-sectional view of a conventional electroluminescent display panel of an upward illumination type.

2 is a partial cross-sectional view of a conventional electroluminescent display panel of a conventional downward illumination type.

3 is a drive circuit diagram of an organic electroluminescence display panel according to a first embodiment of the present invention.

4A to 4D are flowcharts showing the fabrication of the organic electroluminescent display panel according to the first embodiment of the present invention.

Figure 5A is an anti-reflective layer of the multilayer structure of Figure 4D.

FIG. 5B is an anti-reflection layer of a multilayer structure according to another embodiment of the present invention.

FIG. 6 is a partial top plan view of the organic electroluminescent display panel of FIG. 4D.

Figure 7 is a partial cross-sectional view showing an organic electroluminescent display panel according to another embodiment of the present invention.

300‧‧‧Organic electroluminescent display panel

310‧‧‧Substrate

320‧‧‧Multi-layer anti-reflective layer

321‧‧‧ openings

321a‧‧‧first opening

321b‧‧‧ second opening

321c‧‧‧ third opening

320c‧‧‧Second metal layer

320d‧‧‧Insulation

330‧‧‧ pixel array

331‧‧‧First electrode

332‧‧‧channel layer

340‧‧‧Color filter pattern

341‧‧‧First color filter pattern

342‧‧‧Second color filter pattern

343‧‧‧ Third color filter pattern

350‧‧‧Organic electroluminescent pattern

351‧‧‧Red organic electroluminescent pattern

352‧‧‧Green organic electroluminescent pattern

353‧‧‧Blue organic electroluminescent pattern

360‧‧‧second electrode

Claims (17)

An organic electroluminescence display panel comprises: a substrate; an anti-reflection layer of a multi-layer structure, the anti-reflection layer of the multi-layer structure has a plurality of openings; and a plurality of color filter patterns are disposed on the substrate An insulating layer covering the anti-reflection layer of the multi-layer structure, wherein the insulating layer separates the anti-reflection layer of the multi-layer structure from the color filter patterns; and a pixel array disposed in the multi-layer structure The anti-reflection layer and the color filter patterns, wherein the pixel array comprises a plurality of first electrodes arranged in an array and a driving circuit electrically connected to the first electrodes; a plurality of organic electroluminescent light patterns, And disposed on the first electrodes; and a second electrode disposed on the organic electroluminescent light patterns. The organic electroluminescent display panel of claim 1, wherein the antireflection layer of the multilayer structure comprises: a first metal layer disposed on the substrate; a phase shift layer; and a second metal a layer, wherein the phase shifting layer is between the first metal layer and the second metal layer. The organic electroluminescent display panel of claim 1, wherein the antireflection layer of the multilayer structure comprises: a metal layer disposed on the substrate; a first dielectric layer; and a second dielectric a layer, wherein the first dielectric layer is located on the metal layer and the Between the second dielectric layers. The organic electroluminescent display panel of claim 1, wherein the openings comprise a plurality of first openings, a plurality of second openings, and a plurality of third openings, and the color filter patterns comprise a plurality of a first color filter pattern, a plurality of second color filter patterns, and a plurality of third color filter patterns, each of the first color filter patterns being respectively filled in one of the first openings, each of the second color filters The patterns are respectively filled into one of the second openings, and each of the third color filter patterns is filled into one of the third openings. The organic electroluminescent display panel of claim 4, wherein the first color filter patterns are red filter patterns, and the second color filter patterns are green filter patterns, and the The three color filter patterns are blue filter patterns, each of the first openings is smaller than the size of each of the second openings, and the size of each of the second openings is smaller than the size of each of the third openings. The organic electroluminescent display panel of claim 5, wherein the organic electroluminescent light pattern comprises a plurality of red organic electroluminescent light patterns, a plurality of green organic electroluminescent light patterns, and a plurality of blue organic electricity An excitation light pattern, the red organic electroluminescent light patterns corresponding to the red filter pattern configurations, the green organic electroluminescent light patterns corresponding to the green filter pattern configurations, and the blue organic electroluminescent light patterns Corresponding to the blue filter pattern configurations. The organic electroluminescent display panel of claim 1, wherein the pixel array further comprises: a plurality of scanning lines; and a plurality of data lines; a plurality of switching transistors, wherein one of the gates of each of the switching transistors is electrically connected to a corresponding scan line, and one source of each of the switching transistors is electrically connected to a corresponding data line; One of the gates of each of the driving transistors is electrically connected to one of the corresponding switching transistors, and one of the driving transistors is electrically connected to the corresponding first electrode, and each of the driving transistors is electrically connected One of the sources is coupled to a voltage source; and a capacitor is electrically coupled between the source of the corresponding driving transistor and the drain of the corresponding switching transistor. The organic electroluminescent display panel of claim 7, wherein the antireflection layer of the multilayer structure has at least one metal layer, and the source of each of the switching transistors is electrically connected to the at least one metal layer. The organic electroluminescent display panel of claim 1, wherein the insulating layer is located between the anti-reflective layer of the multilayer structure and the pixel array. A method for manufacturing an organic electroluminescence display panel, comprising: forming a multi-layer anti-reflection layer on a substrate, the anti-reflection layer of the multi-layer structure having a plurality of openings; forming an anti-reflection layer on the multi-layer structure An insulating layer is formed on the insulating layer; a plurality of color filter patterns are formed in the openings; and a plurality of first electrodes arranged in an array are formed on the driving circuit and the color filter patterns, wherein The first electrodes are electrically connected to the driving circuit to form a pixel array; and a plurality of organic electroluminescent light patterns are formed on the first electrodes; Forming a second electrode on the organic electroluminescent light patterns. The method of manufacturing an organic electroluminescent display panel according to claim 10, wherein the method of forming the antireflection layer of the multilayer structure comprises: forming a first metal layer on the substrate; and the first metal layer Forming a phase shift layer thereon; and forming a second metal layer on the phase shift layer. The method for manufacturing an organic electroluminescent display panel according to claim 10, wherein the method of forming the antireflection layer of the multilayer structure comprises: forming a metal layer on the substrate; forming a first layer on the metal layer a dielectric layer; and a second dielectric layer formed on the first dielectric layer. The method of manufacturing the organic electroluminescent display panel of claim 10, wherein the openings comprise a plurality of first openings, a plurality of second openings, and a plurality of third openings to form the color filters The method includes: forming a plurality of first color filter patterns, a plurality of second color filter patterns, and a plurality of third color filter patterns, wherein each of the first color filter patterns is filled in one of the first openings Each of the second color filter patterns is filled into one of the second openings, and each of the third color filter patterns is filled into one of the third openings. The method of manufacturing the organic electroluminescent display panel of claim 13, wherein the first color filter patterns are red filter patterns, and the second color filter patterns are green filter patterns, and The first The three color filter patterns are blue filter patterns, each of the first openings is smaller than the size of each of the second openings, and the size of each of the second openings is smaller than the size of each of the third openings. The method of manufacturing the organic electroluminescent display panel of claim 14, wherein the method of forming the organic electroluminescent light pattern comprises: forming a plurality of red organic electroluminescent light patterns, and a plurality of green organic electroluminescent light a pattern and a plurality of blue organic electroluminescent light patterns, wherein the red organic electroluminescent light patterns correspond to the red color filter pattern configurations, and the green organic electroluminescent light patterns correspond to the green filter pattern configurations, and The blue organic electroluminescent light patterns correspond to the blue filter pattern configurations. The method of manufacturing the organic electroluminescent display panel of claim 10, wherein the method of forming the driving circuit further comprises: forming a plurality of scan lines; forming a plurality of data lines; forming a plurality of switching transistors, wherein One of the gates of each of the switching transistors is electrically connected to a corresponding scan line, wherein one source of each of the switching transistors is electrically connected to a corresponding data line; a plurality of driving transistors are formed, wherein each of the driving electrodes One of the gates of the transistor is electrically connected to one of the corresponding switching transistors, and one of the driving transistors is electrically connected to the corresponding first electrode, and one of the driving transistors is one of the sources. The pole is coupled to a voltage source; and a capacitor is formed, wherein the capacitor is electrically coupled between the source of the corresponding driving transistor and the drain of the corresponding switching transistor. Organic electroluminescence display as described in claim 16 The manufacturing method of the panel, wherein the anti-reflective layer of the multilayer structure has at least one metal layer, and the source of each of the switching transistors is electrically connected to the at least one metal layer.