CN111432520A - A balanced method for driving OLED panel with low power consumption - Google Patents

Abstract

The present invention relates to an equalization method for driving an OLED panel with low power consumption. The equalization method is specifically: optionally connected to the panel power supply voltage ELVDD for driving, so that the channel amplifier AMP of the OLED panel is optionally disabled. When the input data of the channel amplifier AMP changes greatly, it is driven by the panel power supply voltage ELVDD, and the channel amplifier AMP does not work to reduce the dynamic current of the panel. When the input data of the channel amplifier AMP changes very little, the panel power supply voltage ELVDD is not connected, and the channel amplifier AMP works to drive, reducing unnecessary access to the panel power supply voltage ELVDD, and further reducing power consumption. The invention can reduce the dynamic current of the panel data line, which accounts for a large part of the current consumption when driving the OLED panel, and realizes the driving of the OLED panel with lower power consumption.

Description

A balanced method for driving OLED panel with low power consumption

technical field

The invention relates to an equalization method for driving an OLED panel with low power consumption.

Background technique

The resolution of mobile phones has increased in recent years. Also, cell phones are used more for entertainment purposes like watching videos, playing games, etc. than for calls. Therefore, there is an urgent need for a low-power driving system that can use the battery for a long time. Currently, the RGBG array method is widely used as an OLED panel array method, but the RGBG method consumes a large amount of dynamic current when driven by the physical sub-pixel layout of the panel. As shown in Figure 2, the pixel array structure of the RGBG panel, D1-D8 represent the data of the panel. In line D1, red and blue subpixels alternate with each H line; in line D2, green one and green two subpixels alternate with each H line; in line D3, contrary to D1, blue and red subpixels alternate with each H line. Alternate H lines. If driving the display of a red image, the D1 and D3 lines will drive the panel in blue (B0) and red (R255) for each H line, and the D2 and D4 lines will remain constant without changing and still in green (G0), But the D1 and D3 lines will consume a lot of dynamic current.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a balanced method for driving an OLED panel with low power consumption, which can drive the OLED panel with low power consumption.

The technical solution adopted by the present invention to solve the technical problem is: an equalization method for driving an OLED panel with low power consumption. The optional channel amplifier AMP does not work.

Specifically, an optional method for accessing the panel power supply voltage ELVDD is:

(A) If vin_a>ELVDD_set_level and vin_b<ELVDD_set_level, it is driven by the panel power supply voltage ELVDD, and the channel amplifier AMP does not work; vin_a is the last input data of the channel amplifier AMP, vin_b is the current input data of the channel amplifier AMP, ELVDD_set_level is a voltage conversion value of the panel power supply voltage ELVDD.

(B) If vin_a<ELVDD_set_level and vin_b>ELVDD_set_level, the panel power supply voltage ELVDD is connected for driving, and the channel amplifier AMP does not work.

(C) If vin_a<ELVDD_set_level and vin_b<ELVDD_set_level, the panel power supply voltage ELVDD is not connected and driven by the operation of the channel amplifier AMP.

Alternatively, if vin_a>ELVDD_set_level and vin_b>ELVDD_set_level, the panel power supply voltage ELVDD is not connected and driven by the channel amplifier AMP.

The output end of the channel amplifier AMP of the OLED panel is connected in series with the ELVDD_EQ switch and then connected to the pixel block of the OLED panel. The access point of the panel power supply voltage ELVDD is connected in series with the ELVDD_EQ switch and then connected to the pixel block of the OLED panel. The ELVDD_EQ switch is the panel power supply Access switch for voltage ELVDD.

The beneficial effects of the present invention are as follows: the present invention proposes an optional equalization method for accessing the power supply voltage ELVDD of the panel, which can reduce the dynamic current of the panel data line, which accounts for a large part of the current consumption when driving the OLED panel. Lower power consumption to drive OLED panels.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings.

1 is a driving principle diagram and a waveform diagram of an embodiment of the present invention applying an equalization method;

Fig. 2 is RGBG panel pixel array structure;

Fig. 3 is the driving principle diagram and waveform diagram of the panel power supply voltage ELVDD that is not connected when the red image is input;

Fig. 4 is the driving principle diagram and waveform diagram of the power supply voltage ELVDD connected to the panel when the red image is input;

Fig. 5 is the driving principle diagram and waveform diagram of the optional access panel power supply voltage ELVDD when the red image is input;

Detailed ways

The present invention will now be further described with reference to the accompanying drawings. These drawings are all simplified schematic diagrams only to illustrate the basic structure of the present invention in a schematic manner, so they only show the structures related to the present invention.

An embodiment of the present invention is an equalization method for driving an OLED panel with low power consumption. As shown in FIG. 1 , the output end of the channel amplifier AMP of the OLED panel is connected in series with the ELVDD_EQ switch and then connected to the pixel block of the OLED panel. The access point of the power supply voltage ELVDD is connected to the pixel block of the OLED panel in series with the ELVDD_EQ switch, and the ELVDD_EQ switch is the access switch of the panel power supply voltage ELVDD.

ELVDD_set_level is the voltage conversion value of the panel power supply voltage ELVDD; the input value of the channel amplifier AMP is compared with ELVDD_set_level, and the optional access to the panel power supply voltage ELVDD for driving makes the channel amplifier AMP of the OLED panel optional to not work.

In Figure 1, it is assumed that vin_a is the previous input data of the channel amplifier AMP, and vin_b is the current input data of the channel amplifier AMP; the optional method of accessing the panel power supply voltage ELVDD is:

(A) Falling edge case: If vin_a>ELVDD_set_level and vin_b<ELVDD_set_level, then ELVDD_EQ=ON and AMP_SW=OFF. ELVDD_EQ=ON means that the panel power supply voltage ELVDD is connected, and AMP_SW=OFF means that the channel amplifier AMP is not working. In this case, when the input data of the channel amplifier AMP drops from a larger position to a smaller position, the input data changes greatly, so the panel power supply voltage ELVDD is connected to reduce the panel dynamic current.

(B) Rising edge case: If vin_a<ELVDD_set_level and vin_b>ELVDD_set_level, then ELVDD_EQ=ON and AMP_SW=OFF. That is, at this time, the panel power supply voltage ELVDD is connected and the channel amplifier AMP does not work. In this case, when the input data of the channel amplifier AMP rises from a small position to a large position, the input data changes greatly, so the panel power supply voltage ELVDD is connected to reduce the panel dynamic current.

(C) If vin_a<ELVDD_set_level and vin_b<ELVDD_set_level, then ELVDD_EQ=OFF and AMP_SW=ON. That is, at this time, the panel power supply voltage ELVDD is not connected and the channel amplifier AMP works.

Alternatively, if vin_a>ELVDD_set_level and vin_b>ELVDD_set_level, then ELVDD_EQ=OFF and AMP_SW=ON. That is, at this time, the panel power supply voltage ELVDD is not connected and the channel amplifier AMP works.

In this case, the change of the input data of the channel amplifier AMP is small, and the panel power supply voltage ELVDD is not required. Therefore, unnecessary access of the panel power supply voltage ELVDD is reduced, and the power consumption is further reduced.

The present invention proposes an optional equalization method for accessing the power supply voltage ELVDD of the panel, which can reduce the dynamic current of the panel data line, which accounts for a large part of the current consumption when driving the OLED panel, and thus realizes driving the OLED with lower power consumption. panel.

The equalization method of the present invention for driving an OLED panel with low power consumption is applied to the pixel array structure of the RGBG panel shown in FIG. 2 .

FIG. 3 is the driving principle diagram and waveform diagram of the panel power supply voltage ELVDD not connected to the input red image; D1, D2 and D3 in FIG. 3 are consistent with D1, D2 and D3 in FIG. 2 . R255 and B0 in D1 are alternately input to the channel amplifier AMP, G0 in D2 is kept constant, and B0 and R255 in D3 are alternately input to the channel amplifier AMP. At this time, the ELVDD_EQ of D1, D2, and D3 are all OFF, that is, they are not connected to the panel power supply voltage ELVDD, and the channel amplifier AMP outputs D1, D2, D3 and drives the panel load, and the power consumption is relatively large.

Figure 4 is the driving principle diagram and waveform diagram of the panel power supply voltage ELVDD when the red image is input; at this time, the ELVDD_EQ of D1, D2, and D3 are all ON, that is, they are all connected to the panel power supply voltage ELVDD, D1 line and D3 line By connecting to the panel power supply voltage ELVDD, the dynamic current that repeatedly rises and falls can be reduced. However, in the D2 line, the panel power supply voltage ELVDD is also connected at this time, which will cause unnecessary dynamic current consumption, as shown at PointA and PointB in Figure 4.

Figure 5 is the driving principle diagram and waveform diagram of the optional access panel power supply voltage ELVDD when inputting a red image; ELVDD_EQ in the D1 line and D3 line is ON, that is, the panel power supply voltage ELVDD is connected, which can reduce the repeated rise and fall. dynamic current. The ELVDD_EQ in the D2 line is OFF, that is, it is not connected to the panel power supply voltage ELVDD, which reduces the unnecessary access consumption of the panel power supply voltage ELVDD, and realizes low power consumption to drive the OLED panel.

Taking the above ideal embodiments according to the present invention as inspiration, and through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the contents in the specification, and the technical scope must be determined according to the scope of the claims.

Claims (3)

1. An equalization method for driving an O L ED panel with low power consumption is characterized in that the equalization method is specifically characterized in that a panel power supply voltage E L VDD can be selectively switched in to drive, so that a channel amplifier AMP of the O L ED panel can be selectively not operated.

2. The balancing method for driving an O L ED panel with low power consumption as claimed in claim 1, wherein the optional method for accessing the panel power supply voltage E L VDD is as follows:

(A) if vin _ a is more than E L VDD _ set _ level and vin _ b is less than E L VDD _ set _ level, then the voltage is switched in by a panel power supply voltage E L VDD for driving, and the channel amplifier AMP does not work;

(B) if vin _ a < E L VDD _ set _ level and vin _ b > E L VDD _ set _ level, then the panel power voltage E L VDD is switched on for driving, and the channel amplifier AMP does not work;

(C) if vin _ a < E L VDD _ set _ level and vin _ b < E L VDD _ set _ level, the panel power voltage E L VDD is not switched in and is driven by the operation of the channel amplifier AMP;

or, if vin _ a > E L VDD _ set _ level and vin _ b > E L VDD _ set _ level, the panel power voltage E L VDD is not switched on and is driven by the operation of the channel amplifier AMP.

3. The equalizing method for driving an O L ED panel with low power consumption as claimed in claim 1, wherein the output terminal of the channel amplifier AMP of the O L ED panel is connected in series with an E L VDD _ EQ switch to the pixel block of the O L ED panel, the access point of the panel power voltage E L VDD is connected in series with an E L VDD _ EQ switch to the pixel block of the O L ED panel, and the E L VDD _ EQ switch is the access switch of the panel power voltage E L VDD.

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