Display Panel Emission Cycle Control for Flicker and Color Shift
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Solution Overview
Problem
Display panels experience flicker and color shifts due to inconsistent light emission patterns, particularly when light emitting elements emit light multiple times per frame, leading to visible changes in color and potential electromagnetic interference.
Innovation Solution
A display apparatus and method that adjusts the light emission cycle and off ratio of gate lines based on luminance and grayscale values, using a driving controller to determine specific light emission cycles and off ratios for different luminance ranges, optimizing the number of light emissions and gate line turn-offs to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light emitting element emits light multiple times in a single frame, then flicker is prevented, but color shift occurs and electromagnetic interference increases
Solution Approach 1:
The patent applies dynamics by making the light emission cycle variable rather than fixed. The driving controller dynamically adjusts the light emission cycle based on the luminance of the displayed image, using different cycles for different luminance ranges. This allows the system to adapt to different display conditions, preventing flicker in high luminance scenarios while reducing color shift and EMI in low luminance scenarios.
Solution Approach 2:
The patent changes the parameter of light emission cycle based on luminance conditions. The driving controller determines different light emission cycles corresponding to different luminance ranges, thereby optimizing display quality across various brightness levels. This parameter change approach resolves the contradiction by allowing multiple light emissions when needed while limiting them when harmful effects occur.
2Reliability
If the light emission cycle is increased to prevent flicker, then display stability improves, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the light emission cycle based on actual display needs and luminance conditions rather than using a fixed high emission cycle. The driving controller selects appropriate light emission cycles from multiple options, increasing emissions only when necessary for stability while reducing them to conserve power during normal operation.
Solution Approach 2:
The patent changes the light emission cycle parameter according to luminance ranges and display conditions. By using different light emission cycles for different luminance levels, the system maintains display stability when required while minimizing power consumption during normal operation, thus resolving the contradiction between stability and energy use.
Data Source
AI summary
A display apparatus including: a display panel including an emission line and a pixel electrically connected to the emission line; an emission driver configured to output an emission signal to the emission line; and a driving controller configured to determine a light emission cycle, wherein the light emission cycle is a number of light emissions in a single frame of the emission signal, wherein the driving controller is configured to determine a luminance according to a user luminance setting and a grayscale value of input image data, to determine the light emission cycle corresponding to a range of the luminance and to determine an off ratio according to the luminance, wherein the off ratio is a ratio of turned-off gate lines to a total number of the gate lines.