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Feedback signal detection method and pixel external analog domain compensation display system

A technology of feedback signal and detection method, applied in static indicators, instruments, etc., can solve the problems of aging OLED luminous efficiency reduction, OLED current reduction, uneven driving of driving circuits, etc.

Active Publication Date: 2021-01-01
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An increase in OLED threshold voltage results in a decrease in OLED current
The luminous efficiency of aging OLED decreases, that is, the same input current, the light emitted by aging OLED decreases
[0005] In addition to the aging problem, TFT, OLED and QLED also have the problem of uneven threshold voltage. For example, in the production process, the threshold voltage will be uneven due to process reasons, which will lead to uneven brightness of the display.
Due to the different arrangement positions of the pixel units on the display screen, the power supply voltage of the pixel units will be uneven due to the flow of current when the display screen emits light, and the uneven temperature will lead to uneven drive tube current.
The unevenness of the source drive modules of each channel will lead to the unevenness of the feedback drive current
[0006] In addition, the display driver chips of all pixel systems have the problem of uneven driving of different driving channels, that is, driving circuits.

Method used

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  • Feedback signal detection method and pixel external analog domain compensation display system
  • Feedback signal detection method and pixel external analog domain compensation display system
  • Feedback signal detection method and pixel external analog domain compensation display system

Examples

Experimental program
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Embodiment 1

[0062] Figure 6 It is a schematic structural diagram of a traditional dual-DAC display system with external pixel compensation. There are M source drive modules 321 in the source driver, and each source drive module 321 includes 2 DACs, namely the first digital-to-analog converter 61 and the second digital-to-analog converter. 62 , the first digital-to-analog converter 61 and the second digital-to-analog converter 62 are respectively connected to the first shift-in circuit 34 and the second shift-in circuit 35 . During the display operation of the conventional dual DAC display system with extra-pixel compensation, the first digital-to-analog converter 61 is used to convert the 8-bit digital display signal disp_n_m, and the second digital-to-analog converter 62 is used to convert the 8-bit digital compensation signal comp_n_m. disp_n_m represents the display signal of the pixel unit in row n and column m, and comp_n_m represents the compensation signal of the pixel unit in row...

Embodiment 2

[0087] Such as figure 1 and Figure 8 As shown, this embodiment is in the Figure 6 An improvement is made on the basis of the traditional externally compensated display system shown, and the first digital-to-analog converter 61 and the second digital-to-analog converter 62 originally connected to the analog adder 63 are respectively connected to the display signal line 44 and the comparator 72 , the display system of the feedback signal detection method in this embodiment adopts Figure 4 The pixel unit shown; in the source driving module 321 of the mth column, the first digital-to-analog converter 61 is connected to the pixel unit 41 of the mth column of the driving channel through the display signal line 44 . The analog adder 63 in the source driver module 321 is idle. (In addition, another design is that the left input port of the adder is still connected to the output of 61, and the right input port is connected to 0V voltage, so that the output voltage of the adder is...

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Abstract

The invention provides a feedback signal detection method and a pixel external analog domain compensation display system. The system comprises M columns of driving channels, each column of which comprises a pixel unit and a detection unit; the detection unit comprises a source driving module and a detection module; and the detection module comprises a comparator. A first digital-to-analog converter and a second digital-to-analog converter are arranged in the source driving module. The source driving module is connected to the pixel unit through a display signal line. A first input end of the comparator is connected to the pixel unit through a feedback signal line, a second input end of the comparator is connected to the second digital-to-analog converter, and the output end of the comparator is used for outputting a detection result. The digital-to-analog converter and the comparator are matched to detect aging information fed back by a target pixel unit, devices like a TFT, an OLED and a QLED can be detected, existing modules in the display system are further utilized, the area of a chip cannot be increased, and the overall design of the display system is optimized.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a feedback signal detection method and an out-of-pixel analog domain compensation display system. Background technique [0002] There are many kinds of display products in the prior art, for example, AMOLED (active matrix organic light-emitting diode or active matrix organic light-emitting diode, Active-matrix organic light-emitting diode) adopts TFT (thin film transistor, Thin Film Transistor) Carry out pixel unit circuit display and add OLED (Organic Light-Emitting Diode or Organic Electroluminesence Display, also known as organic light-emitting diode, organic electroluminescence display or organic light-emitting semiconductor) display screen on it. [0003] OLED-on-Silicon or QLED-on-Silicon type micro-display products use silicon as a pixel unit circuit display, and add OLED or QLED (Quantum Dot Light Emitting Diodes T1, Quantum Dot Light Emitting Diodes) light-emitti...

Claims

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Application Information

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IPC IPC(8): G09G3/00G09G3/3233
CPCG09G3/006G09G3/3233
Inventor 林兴武张盛东张敏焦海龙黄杰邱赫梓李成林文金元
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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