VA Display Driving Method for Wide-Angle Color Deviation
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Solution Overview
Problem
Large-size liquid crystal display panels, particularly those using Vertical Alignment (VA) technology, suffer from severe color deviation at wide viewing angles due to rapid voltage saturation, leading to poor image quality and color cast compared to front-view images.
Innovation Solution
A driving method for a display module that involves converting RGB color signals into HSV color space signals, adjusting color saturation using predetermined coefficients, and synchronously adjusting backlight brightness to improve color saturation and reduce color deviation across different viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VA liquid crystal technology is used to achieve high producing efficiency and low manufacturing cost, then productivity and ease of manufacture are improved, but color deviation at wide viewing angles deteriorates
Solution Approach 1:
The patent converts color signals from RGB color space to HSV color space, and adjusts the saturation parameter S in HSV space to compensate for viewing angle effects. By changing the saturation parameter dynamically based on viewing angle, the patent resolves the color deviation issue while maintaining VA technology's production efficiency
Solution Approach 2:
The patent introduces an intermediate processing step involving color space conversion and saturation adjustment as a mediator between the display signal and the actual display output. This intermediary processing corrects the color deviation caused by VA technology without changing the physical structure or manufacturing process
2Illumination intensity
If voltage is increased to improve brightness saturation, then illumination intensity is improved, but color deviation at wide viewing angles worsens
Solution Approach 1:
Instead of changing voltage to control brightness saturation, the patent changes the saturation parameter in HSV color space through signal processing. This allows independent control of brightness and color saturation, resolving the contradiction between brightness saturation and color deviation
Solution Approach 2:
The patent replaces the mechanical/electrical approach of adjusting voltage to control brightness with a signal processing approach using color space conversion and parameter adjustment. This substitution allows precise control of color saturation without the side effects of voltage changes on color accuracy
3Manufacturing precision
If color saturation is increased to improve color performance, then color saturation is improved, but color deviation at wide viewing angles worsens
Solution Approach 1:
The patent dynamically adjusts the saturation parameter in HSV color space based on the relationship between color saturation and viewing angle. By changing the saturation parameter appropriately, the patent maintains color performance while compensating for viewing angle effects
Solution Approach 2:
The patent makes the saturation parameter dynamic rather than fixed, adjusting it in real-time based on display conditions and viewing angle. This dynamic adjustment allows the system to maintain optimal color saturation while minimizing color deviation across different viewing angles
Data Source
AI summary
The present disclosure provides a driving method of a display module, a driving system thereof, and a display device. The driving method of the display module includes a display panel driving process, and a backlight module driving process driven synchronously with the display panel driving process. The display panel driving process includes steps: receiving first color signals, and converting into second color signals to drive the display panel. The backlight module driving process includes steps: using the light source adjustment coefficient to adjust a first brightness value to obtain a second brightness value to driven first color light sources and/or second color light sources.