Display Driving-Frequency Control for Uniform Gamma and Color
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Solution Overview
Problem
Existing display devices experience luminance and color coordinate distortions during driving frequency conversion due to variations in the duration of horizontal synchronization signals, requiring separate optical compensations for standard and high frame rates, which prolongs the manufacturing process.
Innovation Solution
A display device that generates a horizontal synchronization signal based on a high frame rate and interpolates gamma voltages for intermediate frequencies during frequency conversion, ensuring consistent operation duration across varying frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate optical compensations are executed for standard frame rate and high frame rate respectively, then luminance and color coordinate distortions are reduced, but manufacturing process time is prolonged
Solution Approach 1:
The patent applies a universal gamma voltage table that can be used across multiple driving frequencies (both standard frame rate and high frame rate). Instead of creating separate compensation tables for each frequency, the invention designs a single gamma voltage table that maintains accuracy across frequency transitions, thereby reducing manufacturing complexity and time while preserving luminance and color coordinate precision.
2Adaptability or versatility
If driving frequency is switched between SFR and HFR, then image display performance is improved, but luminance and color coordinate variations occur
Solution Approach 1:
The patent addresses luminance and color coordinate variations during frequency switching by carefully designing the gamma voltage table with specific voltage values that compensate for frequency-dependent changes. The gamma voltage parameters are optimized to maintain consistent display characteristics across different driving frequencies, allowing the display device to adapt to frequency changes without sacrificing image quality.
Data Source
AI summary
A display device includes a display panel having a plurality of sub-pixels to display an image; a data driver for supplying image data to the plurality of sub-pixels; a gate driver for supplying a gate signal to the plurality of sub-pixels; a controller configured to convert a driving frequency of each of the data driver and the gate driver in a high frame rate mode; and a gamma voltage generator for generating gamma voltages respectively based on each driving frequency, wherein the controller is configured to generate a horizontal synchronization signal based on the driving frequency in the high frame rate mode. Accordingly, even when the driving frequency conversion occurs, image quality levels corresponding to various driving frequencies respectively may be kept uniform by applying the same operation duration to the various driving frequencies.