Display Gate Driver Segmentation for Image Quality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses face issues with image quality due to afterimage, crosstalk, and flicker, primarily caused by the common voltage affecting sub-pixels differently based on color, leading to suboptimal gamma curve voltages.
Innovation Solution
The display apparatus employs a method where sub-pixels of different colors are driven using distinct gamma reference voltages and gate signals, with specific durations for each color, allowing for optimized common voltage generation based on color-specific gamma curves to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common voltage is applied to all sub-pixels, then the circuit design is simplified, but image quality deteriorates due to afterimage, crosstalk, and flicker caused by different optimal voltages for different colors
Solution Approach 1:
The patent segments the gate driving into separate time periods for different color sub-pixels (first gate signals for first color sub-pixels, second gate signals for second color sub-pixels). This temporal segmentation allows different common voltages to be applied to different color groups, resolving the image quality issue while maintaining a single common voltage line infrastructure.
Solution Approach 2:
The patent implements dynamic common voltage adjustment by switching between first common voltage and second common voltage based on the active color sub-pixel group. The common voltage changes over time according to the gate signal sequence, optimizing image quality for each color while maintaining circuit simplicity.
2Reliability
If different common voltages are applied to different color sub-pixels simultaneously, then image quality is improved, but device complexity increases due to additional voltage generation and switching circuits
Solution Approach 1:
The patent uses periodic action by alternating between first common voltage and second common voltage in time periods corresponding to different color sub-pixel groups. This periodic switching approach achieves color-optimized voltage application without requiring complex simultaneous multi-voltage generation circuits.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that at any given time, the appropriate common voltage is applied to the active color sub-pixel group. The switching between voltages is seamless and synchronized with the gate signal sequence, maintaining continuous optimal performance without interruption.
3Ease of operation
If gate signals are applied to all gate lines simultaneously, then the driving sequence is simplified, but display quality deteriorates due to inability to optimize timing for different color sub-pixels
Solution Approach 1:
The patent segments the gate signal driving into separate time periods: first gate signals for first color sub-pixels during a first time period, and second gate signals for second color sub-pixels during a second time period. This segmentation enables optimized timing for each color while maintaining an overall simple driving sequence structure.
4Device complexity
If a single gamma curve is used for all sub-pixels, then the voltage generation is simplified, but display quality deteriorates due to different optimal gamma curves for different colors
Solution Approach 1:
The patent implements dynamic gamma curve selection by switching between first gamma curve (with first gamma reference voltage) and second gamma curve (with second gamma reference voltage) based on the active color sub-pixel group. This dynamic approach achieves color-optimized gamma correction without requiring complex simultaneous multi-gamma circuitry.
Data Source
AI summary
A display apparatus includes a display panel, a gate driver and a data driver. The display panel displays an image and includes first sub-pixels which display a first color, second sub-pixels which display a second color different from the first color, first gate lines to which only the first sub-pixels are connected, second gate lines to which only the second sub-pixels are connected, and data lines. The gate sequentially applies first gate signals only to the first gate lines during a first duration of a first frame, and sequentially applies second gate signals only to the second gate lines during a second duration of the first frame, where the second duration is subsequent to the first duration. The data driver outputs data voltages to the data lines based on input image data in synchronization with a driving sequence of the first and second gate lines.