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Device and method for external dynamic compensation of DC voltage drop in active area of ​​display screen

A DC voltage, dynamic compensation technology, applied in static indicators, circuits, electrical components, etc., can solve the problems of the display brightness of the active area being greatly affected, the value is difficult to set accurately, and the display effect of the active area is not uniform. Improve the display quality, easy to implement, and the effect of related circuit design is simple

Active Publication Date: 2016-09-07
BOE TECH GRP CO LTD
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  • Description
  • Claims
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Problems solved by technology

Since the display brightness of the pixel unit of the OLED device is proportional to the square of the power supply voltage, the display brightness of the pixel unit of the OLED device is very sensitive to the change of the driving voltage signal in the low grayscale display state. This voltage drop, that is, IR drop, will cause The uneven display effect of the active area has a great impact on the display brightness of the active area
[0005] At the same time, since the IR drop is related to the display content of the screen, the existence of the IR drop also makes it difficult to accurately set the value of the parameter γ used by the display to represent the distortion of the output image to the input signal

Method used

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  • Device and method for external dynamic compensation of DC voltage drop in active area of ​​display screen
  • Device and method for external dynamic compensation of DC voltage drop in active area of ​​display screen
  • Device and method for external dynamic compensation of DC voltage drop in active area of ​​display screen

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] Such as figure 1 as shown, figure 1 It is a schematic diagram of a display device including a display screen and an external device for dynamically compensating the DC voltage drop in the active area of ​​the display screen according to an embodiment of the present invention. The display device includes a display screen 1, an input signal comparator 2, a processor 3 and a voltage signal A modulation device 4, wherein the input signal comparator 2, the processor 3 and the voltage signal modulation device 4 are sequentially connected to form an external device for dynamically compensating the DC voltage drop in the active area of ​​the display screen, and the input signal comparator 2 and the voltage signal modulatio...

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Abstract

The invention discloses a device and method for externally dynamically compensating the DC voltage drop in the active area of ​​a display screen. The device includes: an input signal comparator for real-time detection of the current or voltage consumption of the current display screen on the ELVDD bus, and will detect The received current or voltage consumption is converted into a digital signal and output to the processor; the processor compares the received digital signal with the current or voltage consumption reference value of the current display screen in the stored reference data information, and obtains the current display screen required Compensate the current or voltage compensation value, and output the current or voltage compensation value to the voltage signal modulation device in digital form; the voltage signal modulation device generates an analog compensation voltage according to the received current or voltage compensation value, and then sends the compensation The voltage is fed back to the ELVDD lead, and applied to each pixel unit through the ELVDD bus in the active area to achieve external dynamic compensation for the DC voltage drop in the active area of ​​the display.

Description

technical field [0001] The present invention relates to the field of active matrix organic light emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED) display technology, in particular to an external dynamic compensation device for DC voltage drop (IR drop) in the active area of ​​the display screen, which has the external dynamic A display device for compensating a DC voltage drop device in an active area of ​​a display screen and an external dynamic compensation method for a DC voltage drop in an active area of ​​a display screen. Background technique [0002] In an AMOLED display system, the luminance of an organic light emitting diode (Organic Light Emitting Diode, OLED) is proportional to the driving current and the square of the driving voltage signal. Therefore, in the low grayscale display state, the luminance of the OLED is directly proportional to the driving current. The voltage signal is very sensitive to changes. In the AMOLED display system, beca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233G09G3/3258G09G3/3225
CPCG09G3/32H10K59/12
Inventor 王颖张林涛刘铭
Owner BOE TECH GRP CO LTD
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