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Voltage drop compensation method and system for AMOLED display panel

A technology of display panel and compensation method, which is applied to static indicators, instruments, etc., can solve the problems of increasing the difficulty of the manufacturing process and the influence of optical characteristics.

Active Publication Date: 2020-03-13
EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing in-plane IR drop compensation scheme focuses on the improvement of the circuit design of the display panel to achieve the compensation effect, which may affect other optical characteristics and increase the difficulty of the manufacturing process.

Method used

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  • Voltage drop compensation method and system for AMOLED display panel
  • Voltage drop compensation method and system for AMOLED display panel
  • Voltage drop compensation method and system for AMOLED display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0227] Experiment with two display panels with better film thickness uniformity. The color coordinates and theoretical (actual) brightness of the display panel are known:

[0228] Sheet 1:

[0229]

[0230] 2nd slice:

[0231]

[0232] It can be seen that the brightness uniformity of the two display panels with better film thickness uniformity before compensation is about 8% higher than that after compensation, and the gamma value of the display panel before and after compensation and the color coordinates of the display panel remain basically the same Varies, within the product rules.

Embodiment 2

[0234] Experiment with two display panels with average film thickness uniformity. The color coordinates and theoretical (actual) brightness of the display panel are known:

[0235] Sheet 1:

[0236]

[0237] 2nd slice:

[0238]

[0239] It can be seen from this that, for two display panels with average film thickness uniformity, the brightness uniformity before compensation is about 5% higher than that after compensation, and the gamma value of the display panel before and after compensation and the color coordinates of the display panel also basically remain the same. Varies, within the product rules.

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Abstract

The invention provides a voltage drop compensation method and system for an AMOLED display panel. The method comprises the steps: carrying out the gamma correction of the display panel, and obtaininga gamma correction table; measuring the display panel to obtain the brightness uniformity and the gray scale number before compensation; selecting a compensation value according to the brightness uniformity and the gray scale number before compensation; dividing the display panel into x compensation blocks, wherein the value of x is reduced along with the increase of the brightness uniformity value before compensation; for each compensation block, compensating the RGB value of the compensation block in combination with the compensation value and the gamma correction table to obtain an output RGB value of the compensation block; and converting the output RGB value of each compensation block into a gate voltage value as an output gate voltage value for respectively controlling the red sub-pixel, the green sub-pixel and the blue sub-pixel. According to the invention, IR Drop compensation is carried out on the white picture after gamma adjustment, so that the gamma value of the gamma adjustment position can be kept in a specification range and the display panel is prevented from color cast.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a voltage drop compensation method and system for an AMOLED display panel. Background technique [0002] AMOLED (Active Matrix Organic Light-Emitting Diode) is a display device driven by current. All sub-pixels (Sub-pixel) start to provide voltage from the IC terminal ELVDD, and the wiring of ELVDD must have a certain resistance. Therefore, there is a certain difference between the theoretical current and the actual current of the Sub-pixel at different positions, which directly affects the brightness uniformity of the panel. This phenomenon is called IR Drop. [0003] The current in-plane IR drop compensation scheme focuses on improving the circuit design of the display panel to achieve the compensation effect, which may affect other optical characteristics and increase the difficulty of the manufacturing process. Contents of the invention [0004] Aiming at the defects in t...

Claims

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Application Information

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IPC IPC(8): G09G3/3225
CPCG09G3/3225G09G2320/0233
Inventor 周明锋任娟郑欢何志江
Owner EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
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