Pixel circuit drive method and drive device

A technology of pixel circuit and driving method, which is applied in the field of driving method of pixel circuit and its driving device, and can solve the problems of increasing the number of memories and increasing the cost, etc.

Inactive Publication Date: 2015-05-06
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a driving method for a pixel circuit and a driving device thereof, which can solve the problem of increasing the number of memories and increasing the cost when the brightness is adjusted by using the gamma curve and the look-up table

Method used

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  • Pixel circuit drive method and drive device

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Embodiment 1

[0037] The above brightness information may include a brightness value of the display screen. That is, the brightness information may be a specific numerical value representing brightness, for example, the brightness information may be X cd / m2 (candela per square meter). In this way, the pulse signal corresponding to the brightness value X cd / m2 (candela per square meter) can be found out from the corresponding relationship table between the brightness value of the display screen and the duty cycle of the pulse signal. duty cycle. Next, the on-off of the light-emitting diode OLED is controlled by the pulse signal PWM with the duty ratio to control the light-emitting time of the light-emitting diode OLED, thereby changing the effective value of the driving current flowing through the light-emitting diode OLED in the light-emitting phase P4, when When the effective value of the driving current is large, the brightness of the light emitting diode OLED is high, and when the effec...

Embodiment 2

[0041] The above brightness information may include a display mode corresponding to the brightness value of the display screen, for example, the brightness information may be a night mode, an outdoor mode, a rainy day mode, and the like. Usually, because the brightness of the external light at night is smaller than that of a cloudy and rainy day, the brightness of the external light on a cloudy and rainy day is smaller than that of the outdoors on a sunny day. Therefore, at night and in rainy days, in order to avoid the glare caused by the high brightness value of the display screen, and in the case of outdoors on a sunny day, the brightness value of the display screen is too low and the external light is strong, resulting in the phenomenon that the screen cannot be seen clearly. The brightness value of the display screen corresponding to the night mode may be adjusted to be smaller than the brightness value corresponding to the rainy day mode, and the brightness value correspo...

Embodiment 3

[0044] In the case where the brightness value is a percentage value, the determining the duty cycle of the pulse signal according to the brightness information may include:

[0045] The percentage value of the brightness value and the percentage value of the duty cycle may be equal.

[0046] For example, for a single pixel unit, under the condition that the data voltage Vdata input to the pixel unit by the data line remains unchanged, if the brightness threshold value of the light-emitting diode OLED is always on in the light-emitting phase, the brightness threshold value is T, when the brightness value is the brightness threshold value 10% of T, the pulse signal PWM can be as Figure 3a The duty cycle shown may be 10%. Alternatively, when the brightness value is 90% of the brightness threshold T, the pulse signal PWM can be as follows Figure 3b The duty cycle shown may be 90%. In this way, the duty cycle of the pulse signal PWM can be intuitively obtained according to the...

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Abstract

An embodiment of the invention provides a pixel circuit drive method and drive device, relates to the technical field of display and is capable of solving the problem that when the gamma curves and the look-up table are utilized for adjusting the brightness, the number of memories is increased, and cost is increased accordingly. The drive method includes in the lighting process, acquiring the brightness information of a display image; determining the duty ratio of pulse signals according to the brightness information; inputting high level into a first voltage terminal, and allowing a first grid line to input the pulse signals with the duty ratio into the gate electrode of a first switch transistor.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a method for driving a pixel circuit and a driving device thereof. Background technique [0002] With the rapid progress of display technology, semiconductor element technology, which is the core of the display device, has also been greatly improved. For existing display devices, Organic Light Emitting Diode (OLED) is a current-type light-emitting device, because of its self-illumination, fast response, wide viewing angle and the ability to be fabricated on flexible substrates, etc. characteristics and are increasingly being used in the field of high-performance displays. OLED can be divided into PMOLED (Passive Matrix Driving OLED, passive matrix driving organic light emitting diode) and AMOLED (Active Matrix Driving OLED, active matrix driving organic light emitting diode) according to the driving method. Response speed, power saving, DC drive available for portable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3233
CPCG09G3/20
Inventor 孟松宋丹娜
Owner BOE TECH GRP CO LTD
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