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OLED driving system and driving method for improving contrast of picture

The technology of a driving system and a driving method, applied in the field of OLED driving systems, can solve the problem of low contrast of the picture, achieve the effect of improving the contrast of the picture and ensuring the display quality of the picture

Active Publication Date: 2015-11-18
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

[0008] In the prior art, the reference voltage Vref of all OLED pixel driving circuits is generally set to a certain fixed value, that is, the reference voltage Vref of each row of pixel driving circuits is equal. In this case, as figure 2 As shown, the display luminance (Luminance) of the OLED increases from the first luminance L1 to the second luminance L2 with the increase of the gray scale level (GrayLevel) of the display screen, and the contrast ratio Contrast of the display screen can be calculated by the formula Contrast=L2 / L1 , the resulting picture has low contrast

Method used

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[0040] In order to further illustrate the technical means adopted by the present invention and its effects, the following describes in detail in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0041] Please also see image 3 , Figure 4 , the present invention firstly provides an OLED drive system for improving image contrast, comprising: an image input module 1, a brightness calculation module 2, a power management module 3, an OLED display panel 4, and an image input module 1 electrically connected to the The image compensation module 5 of the brightness calculation module 2 , the timing controller 6 electrically connected to the image compensation module 5 , and the source driver 7 electrically connected to the timing controller 6 and the OLED display panel 4 .

[0042] The OLED display panel 4 has a plurality of pixels arranged in an array, and a pixel driving circuit is arranged in each pixel. Such as figure 1 As shown, the ...

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Abstract

The invention provides an OLED driving system and driving method for improving the contrast of a picture. According to the OLED driving system and driving method, an OLED display panel (4) is equally partitioned into a plurality of display sub-regions along a vertical direction; average pixel brightness corresponding to the display sub-regions in the OLED display panel (4) is calculated through a brightness calculation module (2); a power source management module (2) correspondingly provides different reference voltages for the display sub-regions according to the average pixel brightness of the display sub-regions in the OLED display panel (4), and inserts the reference voltages of the display sub-regions into reference voltage lines of middle row pixels of corresponding display sub-regions, so that the reference voltages of the display sub-regions can be different, and therefore, the contrast of the picture can be improved; an image compensation module (5) compensates picture data of one frame of picture according to the average pixel brightness of the display sub-regions in the OLED display panel (4), so that the display quality of the picture can be ensured.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an OLED drive system and a drive method for improving image contrast. Background technique [0002] Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and large-area comprehensive display. With many advantages such as color display, it is recognized by the industry as the display device with the most development potential. [0003] An OLED display device has a plurality of pixels arranged in an array, and an organic light emitting diode is driven to emit light through a pixel driving circuit. figure 1 Shown is a 3T1C pixel driving circuit for OLED, including: a first thin film transistor T1, a second thin film transistor T2, a third th...

Claims

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Application Information

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IPC IPC(8): G09G3/32
CPCG09G3/3233G09G2300/0861G09G2310/0251G09G2310/0262G09G2360/16G09G3/3258G09G2300/0871G09G2310/08G09G2320/0233G09G2320/066
Inventor 陈小龙吴智豪陈明锋
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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