Display Panel Driving Compensation for Flicker Reduction
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Solution Overview
Problem
Display panels experience flicker due to luminance differences between writing and holding frames during low frequency driving modes, leading to increased power consumption and reduced display quality.
Innovation Solution
A display apparatus and method that incorporates a writing compensation frame with specific gate and data signal configurations, using a combination of polysilicon and oxide thin film transistors, to minimize luminance differences between frames, thereby reducing flicker and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the driving frequency of the display panel is reduced to reduce power consumption, then power consumption is reduced, but flicker is generated due to luminance differences between writing frame and holding frame
Solution Approach 1:
The patent applies preliminary action by introducing a writing compensation frame between the writing frame and holding frame to pre-compensate for threshold voltage shifts. The gate driver outputs a data write gate signal with first active level during the writing compensation frame to adjust the threshold voltage before the holding frame, thereby preventing luminance differences and flicker while maintaining low driving frequency operation.
Solution Approach 2:
The patent changes the parameter of gate signal active level dynamically. The gate driver outputs the data write gate signal with first active level during the writing compensation frame and with second active level during the writing frame. This parameter change allows the system to compensate for threshold voltage shifts and maintain stable luminance while operating at reduced driving frequency.
2Use of energy by stationary object
If the driving frequency is reduced to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to luminance differences
Solution Approach 1:
The writing compensation frame performs preliminary compensation of threshold voltage shifts before the holding frame is displayed. By outputting the data write gate signal with the first active level during this compensation frame, the system pre-adjusts the transistor threshold voltage to match the holding frame conditions, ensuring luminance uniformity is maintained even at reduced driving frequency.
Solution Approach 2:
The patent implements feedback by monitoring the threshold voltage shift caused by low-frequency operation and using the writing compensation frame to adjust the gate signal accordingly. The gate driver responds to the threshold voltage changes by dynamically changing the active level of the data write gate signal, creating a feedback loop that maintains luminance uniformity.
3Object-affected harmful factors
If a writing compensation frame is added to compensate for threshold voltage variations, then flicker is reduced, but device complexity increases
Solution Approach 1:
The patent merges the compensation function with the existing frame structure by integrating the writing compensation frame between the writing frame and holding frame. Rather than adding a separate complex compensation device, the system combines multiple functions (writing, compensation, and holding) into a unified temporal sequence, reducing overall device complexity while effectively reducing flicker.
Data Source
AI summary
A display apparatus includes a display panel, a gate driver, a data driver and an emission driver. The display panel includes a pixel. The gate driver outputs a data write gate signal having a corresponding active level and a data initialization gate signal having a corresponding active level to the pixel in a writing frame, outputs the data write gate signal not having the corresponding active level and the data initialization gate signal not having the corresponding active level to the pixel in a holding frame and outputs the data write gate signal having the corresponding active level and the data initialization gate signal not having the corresponding active level to the pixel in a writing compensation frame. The data driver outputs a data voltage to the pixel. The emission driver outputs an emission signal to the pixel.