Display Panel Gate Driver Alternate Scanning for Flicker Reduction
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Solution Overview
Problem
Display panels experience flicker and reduced display quality when driven at low frequencies for static images, leading to increased power consumption and luminance degradation due to current leakage.
Innovation Solution
A display apparatus and method that dynamically adjust the driving frequency based on image type, using an alternate driving mode for static images to scan odd and even gate lines in alternating durations, and inserting a compensation frame during image transitions to prevent flicker and enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is driven in a low driving frequency to reduce power consumption, then power consumption is reduced, but display quality deteriorates due to flicker
Solution Approach 1:
The gate lines are divided into multiple groups (first group and second group) that are scanned alternately. In the first duration, the first group of gate lines is scanned, and in the second duration, the second group of gate lines is scanned. This segmentation allows the display to operate at lower frequency while maintaining display quality by preventing flicker through alternating scanning of different gate line groups.
Solution Approach 2:
The gate driver operates in a periodic alternating manner, scanning different groups of gate lines in alternating durations. This periodic action creates a rhythm where one group is scanned while others remain inactive, and then switches between groups. This periodic scanning pattern prevents flicker by ensuring continuous updates across different segments of the display panel.
2Use of energy by moving object
If the display panel is driven in a low driving frequency to reduce power consumption, then power consumption is reduced, but luminance degradation occurs due to current leakage
Solution Approach 1:
By segmenting the gate lines into multiple groups and scanning them alternately, the invention ensures that all pixel regions are periodically refreshed. This segmentation-based refreshing prevents cumulative current leakage from causing permanent luminance degradation, as each segment is updated before leakage can cause irreversible changes.
Solution Approach 2:
The alternating scanning of gate line groups maintains continuous useful action across the display panel. While one group is being scanned, other groups are being updated or held, ensuring that the entire panel receives periodic updates. This continuous action prevents the display from entering a state where current leakage causes permanent luminance loss.
3Reliability
If a compensation frame is inserted to scan all gate lines during image transition, then flicker is prevented, but driving time increases
Solution Approach 1:
The compensation frame is inserted at specific moments when image transitions occur, rather than continuously scanning all gate lines throughout the entire display cycle. This preliminary action is taken only when necessary (during transitions) to prevent flicker, thereby minimizing the additional time cost while maintaining display quality.
Solution Approach 2:
Instead of continuously scanning all gate lines throughout the entire frame period, the invention performs partial scanning only when needed (during image transitions). The compensation frame scans all gate lines temporarily during transitions, but returns to the more efficient alternating group scanning for the majority of the display cycle, thus balancing quality and time.
Data Source
AI summary
A display apparatus includes a display panel including pixels, a gate driver applying a gate signal to a gate line, a data driver applying a data voltage to a data line and a driving controller determining a mode of an input image data to a moving image mode or a static image mode according to whether the input image data is a moving image or a static image, driving the display panel in a moving image driving frequency in the moving image mode and in a static image driving frequency in the static image mode, operating the gate driver in an alternate driving mode such that the gate driver scans a first group of the gate lines in a first duration and a second group of the gate lines in a second duration and inserting a compensation frame to scan all of the gate lines when an image transition is occurred in the static image mode.