CN111432520B - Equalization method for driving OLED panel with low power consumption - Google Patents
Equalization method for driving OLED panel with low power consumption Download PDFInfo
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Abstract
The invention relates to an equalization method for driving an OLED panel with low power consumption, which comprises the following steps: the optional access panel power voltage ELVDD is driven such that the channel amplifier AMP of the OLED panel is optionally inactive. When the input data of the channel amplifier AMP changes greatly, the panel power voltage ELVDD is applied to drive the channel amplifier AMP, and the channel amplifier AMP does not operate to reduce the panel dynamic current. When the input data of the channel amplifier AMP is changed a little, the panel power supply voltage ELVDD is not accessed, and the channel amplifier AMP works to drive, so that unnecessary access of the panel power supply voltage ELVDD is reduced, and power consumption is further reduced. The invention can reduce the dynamic current of the panel data line occupying a large part of current consumption when driving the OLED panel, and realize the driving of the OLED panel with lower power consumption.
Description
Technical Field
The invention relates to a balancing method for driving an OLED panel with low power consumption.
Background
In recent years, the resolution of mobile phones has increased. In addition, cellular phones are used more for entertainment purposes, such as watching video, playing games, etc., than for telephone calls. Therefore, a low power consumption driving system capable of using a battery for a long time is urgently required. Currently, the RGBG array method is used much as the OLED panel array method, but the RGBG method consumes a large amount of dynamic current when driven by the panel physical sub-pixel layout. As shown in FIG. 2, the RGBG panel pixel array structure, D1-D8, represents the data of the panel. The red and blue subpixels alternate with each H line in line D1; the green one and green two subpixels in line D2 alternate with each H line; of the D3 lines, blue and red subpixels alternate with each H line, as opposed to D1. If the display of a red image is driven, the D1 and D3 lines drive the panel in blue (B0) and red (R255) per H line, the D2 and D4 lines remain constant without changing to green (G0), but the D1 and D3 lines will consume a large amount of dynamic current.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the equalization method for driving the OLED panel with low power consumption is provided, and the OLED panel can be driven with low power consumption.
The technical scheme adopted by the invention for solving the technical problems is as follows: an equalization method for driving an OLED panel with low power consumption is particularly characterized in that: the optional access panel power voltage ELVDD is driven such that the channel amplifier AMP of the OLED panel is optionally inactive.
Specifically, the method for selectively accessing the panel power voltage ELVDD includes:
(A) if vin _ a is greater than ELVDD _ set _ level and vin _ b is less than ELVDD _ set _ level, the panel power supply voltage ELVDD is switched on for driving, and the channel amplifier AMP does not work; vin _ a is last input data of the channel amplifier AMP, vin _ b is current input data of the channel amplifier AMP, and 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 applied for driving, and the channel amplifier AMP does not operate.
(C) If vin _ a < ELVDD _ set _ level and vin _ b < ELVDD _ set _ level, the panel power supply voltage ELVDD is not switched on and is driven by the operation of the channel amplifier AMP.
Or, if vin _ a > ELVDD _ set _ level and vin _ b > ELVDD _ set _ level, the panel power supply voltage ELVDD is not switched on and is driven by the operation of the channel amplifier AMP.
The output end of the channel amplifier AMP of the OLED panel is connected with the pixel block of the OLED panel after being connected with the ELVDD _ EQ switch in series, the access point of the panel power supply voltage ELVDD is connected with the pixel block of the OLED panel after being connected with the ELVDD _ EQ switch in series, and the ELVDD _ EQ switch is an access switch of the panel power supply voltage ELVDD.
The invention has the beneficial effects that: the invention provides an optional balancing method for the panel power supply voltage ELVDD, which can reduce the dynamic current of the panel data line occupying a large part of current consumption when an OLED panel is driven, thereby realizing the drive of the OLED panel with lower power consumption.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a driving schematic diagram and a waveform diagram of an embodiment of the present invention to which an equalization method is applied;
FIG. 2 is an RGBG panel pixel array structure;
fig. 3 is a driving schematic diagram and a waveform diagram without accessing the panel power voltage ELVDD when a red image is input;
fig. 4 is a driving schematic diagram and a waveform diagram each of which is connected to the panel power voltage ELVDD when a red image is input;
fig. 5 is a driving schematic diagram and a waveform diagram of an optional access panel power voltage ELVDD when a red image is input;
Detailed Description
The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In an embodiment of the present invention, as shown in fig. 1, an output terminal of a channel amplifier AMP of an OLED panel is connected in series with an ELVDD _ EQ switch and then connected to a pixel block of the OLED panel, an access point of a 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, and the ELVDD _ EQ switch is an access switch of the panel power supply voltage ELVDD.
ELVDD _ set _ level is a voltage conversion value of the panel power supply voltage ELVDD; and comparing the input value of the channel amplifier AMP with the ELVDD _ set _ level, and optionally switching in the panel power supply voltage ELVDD for driving so that the channel amplifier AMP of the OLED panel is optionally not operated.
In fig. 1, it is assumed that vin _ a is last input data of the channel amplifier AMP, and vin _ b is current input data of the channel amplifier AMP; the optional method for accessing the panel power voltage ELVDD is as follows:
(A) falling edge situation: if vin _ a > ELVDD _ set _ level and vin _ b < ELVDD _ set _ level, ELVDD _ EQ is ON and AMP _ SW is OFF. The ELVDD _ EQ is ON, which means that the panel power supply voltage ELVDD is turned ON, and the AMP _ SW is OFF, which means that the channel amplifier AMP does not operate. In this case, when the input data of the channel amplifier AMP is dropped from a large position to a small position, the input data is greatly changed, and thus the panel power voltage ELVDD is accessed to reduce the panel dynamic current.
(B) Rising edge situation: if vin _ a < ELVDD _ set _ level and vin _ b > ELVDD _ set _ level, ELVDD _ EQ is ON and AMP _ SW is OFF. Namely, the panel power voltage ELVDD is turned on and the channel amplifier AMP does not operate at this time. 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, and thus the panel power supply voltage ELVDD is accessed to reduce the panel dynamic current.
(C) If vin _ a < ELVDD _ set _ level and vin _ b < ELVDD _ set _ level, ELVDD _ EQ is OFF and AMP _ SW is ON. That is, the panel power voltage ELVDD is not turned on and the channel amplifier AMP operates at this time.
Alternatively, if vin _ a > ELVDD _ set _ level and vin _ b > ELVDD _ set _ level, ELVDD _ EQ is OFF and AMP _ SW is ON. That is, the panel power voltage ELVDD is not turned on and the channel amplifier AMP operates at this time.
In this case, the input data of the channel amplifier AMP is less changed, and the panel power supply voltage ELVDD is not required, thereby reducing access of the unnecessary panel power supply voltage ELVDD and further reducing power consumption.
The invention provides an optional balancing method for the panel power supply voltage ELVDD, which can reduce the dynamic current of the panel data line occupying a large part of current consumption when an OLED panel is driven, thereby realizing the drive of the OLED panel with lower power consumption.
The equalization method for driving the OLED panel with low power consumption is applied to the RGBG panel pixel array structure shown in FIG. 2.
Fig. 3 is a driving schematic diagram and a waveform diagram without accessing the panel power voltage ELVDD when a red image is input; d1, D2, D3 of fig. 3 are identical to D1, D2, D3 of 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, ELVDD _ EQ of D1, D2, and D3 is OFF, i.e., is not connected to panel power supply voltage ELVDD, and is output by channel amplifier AMP D1, D2, and D3 and drives the panel load, which results in relatively large power consumption.
Fig. 4 is a driving schematic diagram and a waveform diagram each of which is connected to the panel power voltage ELVDD when a red image is input; at this time, ELVDD _ EQ of D1, D2, and D3 is ON, i.e., panel power voltage ELVDD is applied, and dynamic current repeating rising and falling can be reduced by applying panel power voltage ELVDD to line D1 and line D3. But in the D2 line, the panel power supply voltage ELVDD is also switched in at this time, causing unnecessary dynamic current consumption, as shown at PointA and PointB in fig. 4.
Fig. 5 is a driving schematic diagram and a waveform diagram of an optional access panel power voltage ELVDD when a red image is input; the ELVDD _ EQ ON the line D1 and the line D3 is ON, i.e., the panel power supply voltage ELVDD is switched in, which may reduce the dynamic current that repeatedly rises and falls. The ELVDD _ EQ in the line D2 is OFF, namely the panel power supply voltage ELVDD is not accessed, the unnecessary access consumption of the panel power supply voltage ELVDD is reduced, and the OLED panel is driven by low power consumption.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. An equalization method for driving an OLED panel with low power consumption is characterized in that: the equalization method specifically comprises the following steps: the optional panel power supply voltage ELVDD is switched in for driving, so that the channel amplifier AMP of the OLED panel is optional to be out of work;
the optional method for accessing the panel power voltage ELVDD is as follows:
if vin _ a is greater than ELVDD _ set _ level and vin _ b is less than ELVDD _ set _ level, the panel power supply voltage ELVDD is switched on for driving, and the channel amplifier AMP does not work; vin _ a is last input data of the channel amplifier AMP, vin _ b is current input data of the channel amplifier AMP, and ELVDD _ set _ level is a voltage conversion value of the panel power supply voltage ELVDD;
if vin _ a is less than ELVDD _ set _ level and vin _ b is greater than ELVDD _ set _ level, the panel power supply voltage ELVDD is switched on for driving, and the channel amplifier AMP does not work;
if vin _ a < ELVDD _ set _ level and vin _ b < ELVDD _ set _ level, the panel power supply voltage ELVDD is not switched on and is driven by the operation of the channel amplifier AMP;
if vin _ a > ELVDD _ set _ level and vin _ b > ELVDD _ set _ level, the panel power supply voltage ELVDD is not switched on and is driven by the operation of the channel amplifier AMP.
2. The equalizing method for driving an OLED panel with low power consumption according to claim 1, wherein: the output end of the channel amplifier AMP of the OLED panel is connected with the pixel block of the OLED panel after being connected with the ELVDD _ EQ switch in series, the access point of the panel power supply voltage ELVDD is connected with the pixel block of the OLED panel after being connected with the ELVDD _ EQ switch in series, and the ELVDD _ EQ switch is an access switch of the panel power supply voltage ELVDD.
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