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Pixel unit and out-of-pixel analog domain compensation display system

A pixel unit and display address technology, applied to static indicators, instruments, etc., can solve the problems of uneven driving of drive circuits, uneven threshold voltage, uneven power supply voltage of pixel units, etc.

Active Publication Date: 2021-04-02
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
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
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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  • Pixel unit and out-of-pixel analog domain compensation display system
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  • Pixel unit and out-of-pixel analog domain compensation display system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Such asfigure 1 The pixel unit circuit structure shown in the present embodiment includes a second switching tube Q2, a driving tube Q1, a third switching tube Q3, a light emitting diode T1, a first capacitor C1, and a second capacitor C2. The present embodiment is described as an example of the Nth row and the M-column pixel unit in a pixel external analog domain compensation display system.

[0041]The gate of the second switching tube Q2 is used to connect to the first display address line SCAN [N] (v_scan_n is a nth row display address signal), and the first pole is used to connect to the M-column display signal. Line DATA [M] (V_DATA_N_M is the display signal of the nth row MR column pixel unit), the second pole is connected to the first pole of the gate and the first capacitor C1 of the driving tube Q1; the second capacitor C1 second Polar connection to the vss terminal (i.e., the display system driving circuit) or the cathode of the light emitting diode T1; the first pole ...

Embodiment 2

[0058]Such asFigure 5 The pixel unit circuit structure shown in the present embodiment includes a second switching tube Q2, a driving tube Q1, a third opening-off tube Q3, a light emitting diode T1, a fourth switching tube Q4, a first capacitor C1, and a second capacitor C2. The present embodiment is described as an example of the Nth row and the M-column pixel unit in a pixel external analog domain compensation display system.

[0059]The difference from the embodiment is in that the pixel unit circuit of the present embodiment adds a fourth switching tube Q4, and the gate of the fourth switching tube Q4 is used to connect to the second display address line SCAN2 [N], which A pole is connected to the second voltage end V2, and the second pole is coupled to the anode of the light emitting diode T1. The second voltage end V2 is a ground terminal; or the second voltage end V2 can be designed as a voltage end of the light-emitting diode T1 anode voltage when the voltage value is lower tha...

Embodiment 3

[0067]Such asFigure 7 The pixel unit circuit structure shown in the present embodiment includes a second switching tube Q2, a driving tube Q1, a third opening-off tube Q3, a light emitting diode T1, a fourth switching tube Q4, a fifth switch tube Q5, a first capacitor C1 And the second capacitor C2. The present embodiment is described as an example of the Nth row and the M-column pixel unit in a pixel external analog domain compensation display system.

[0068]The difference between the present embodiment and the second embodiment is that the pixel unit circuit of the present embodiment has increased the fifth switching tube Q5, and the gate of the fifth switching tube Q5 is used to connect to the second display address line of the reverse display address line EM. [N], its first pole is connected to the VOLED_HIGH side, and the second pole is coupled to the first pole of the driving tube Q1, so that the fifth switching tube Q5 is coupled to between the VOLED_HIGH terminal and the drive...

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Abstract

The invention provides a pixel unit and a pixel external analog domain compensation display system. The pixel unit comprises a driving tube, a second switching tube, a third switching tube, a light emitting diode, a first capacitor and a second capacitor. The display system comprises M columns of driving channels, each column of driving channel comprises a detection unit and the pixel unit; the detection unit comprises a source driving module and a detection module, and the detection module comprises a comparator. The pixel unit does not need to control the gate-source voltage difference of the driving tube Q1 according to a traditional current source design scheme so as to control the current provided for the light emitting diode T1 by the driving tube Q1, and therefore improvement is achieved on the basis of the traditional scheme. According to the display system disclosed by the invention, the threshold voltage of the pixel unit driving tube and the threshold voltage change condition of the OLED are directly detected by repeatedly using the existing modules, so the overall design of the display system is optimized.

Description

Technical field[0001]The present invention relates to the field of photoelectric technology, and more particularly to a pixel unit and an external analog domain compensation display system.Background technique[0002]OLED (Organic Light-Emitting DioDe or Organic ", an organic light-emitting diode, an organic electrical laser display or an organic light-emitting semiconductor) display system, such as a micro-display, OLEDOS, OLED-ON-Silicon, is The pixel unit circuit is designed to a current source, typically using voltage programming and current driven to make OLEDs to illuminate. That is, the display voltage associated with the grayshade is written to the pixel unit circuit in the form of a voltage, and then the pixel unit circuit generates a fixed-size current driving OLED to illuminate. The pixel unit circuit of the current source is to control the driving current size by controlling the method of controlling the MOSFET (Metal-Oxide-Semiconductorfield-Effect Transistor, the metal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225G09G3/3258
CPCG09G3/32G09G3/3225G09G3/3258
Inventor 林兴武张盛东张敏焦海龙邱赫梓李成林
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL