Liquid Crystal Display Driving Method for Color Shift Correction
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Solution Overview
Problem
Liquid crystal display devices experience significant color shift at large viewing angles due to the difference in brightness between frontal and side viewing angles, particularly with red, green, and blue color systems, and existing methods to improve this require additional metal routing and driving devices, increasing cost and affecting transmittance.
Innovation Solution
A driving method for liquid crystal display devices that calculates average gray scale values for red, green, and blue sub-pixels, turns off the light source corresponding to the minimum average gray scale value in each display area, and increases backlight brightness and driving frequency to maintain image brightness and speed without additional wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If each sub-pixel is subdivided into primary and secondary pixels with different driving voltages, then color shift at large viewing angles is improved, but the metal routing and driving devices must be doubled, sacrificing light-transmissive opening area and increasing cost
Solution Approach 1:
The display panel is divided into multiple display areas, and the backlight module is divided into corresponding backlight units. Each backlight unit can be independently controlled to provide backlight for specific display areas. This segmentation allows selective activation of backlight units based on gray scale requirements without requiring additional routing for each sub-pixel.
Solution Approach 2:
The patent changes the driving approach from varying voltage at pixel level to varying backlight brightness at display area level. By adjusting the backlight module's brightness parameters dynamically based on gray scale values, the invention achieves color shift improvement without complex pixel-level routing modifications.
2Illumination intensity
If the primary pixel and secondary pixel are both driven to display in the latter half of gray scale, then brightness distribution is improved, but additional driving devices increase cost
Solution Approach 1:
The backlight module acts as an intermediary between the driving circuit and the display panel. Instead of controlling multiple pixels directly, the system uses the backlight module to adjust brightness distribution. The grayscale processing unit calculates average gray scale values and controls backlight units accordingly, simplifying the driving architecture while achieving brightness optimization.
3Ease of manufacture
If backlight brightness is increased to maintain overall image brightness, then color shift is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts backlight brightness based on real-time gray scale requirements. The grayscale processing unit calculates average gray scale values for each display area and selectively activates or adjusts backlight units accordingly. This dynamic control ensures backlight is used efficiently only when and where needed, avoiding unnecessary energy consumption while maintaining color accuracy.
Data Source
AI summary
Disclosed are display device and a method for driving same: calculating a sub-pixel scale average value of each pixel in a pixel unit corresponding to original gray scale data to be displayed in a display region, and shutting off a light source corresponding to a sub-pixel color having the smallest average gray scale value in a backlight unit corresponding to each display region.