Liquid Crystal Display Driving Method Reducing Angular Color Shift
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Solution Overview
Problem
Large-sized VA liquid crystal panels face issues with angular color shift, which affects their optical properties and increases manufacturing costs due to the need for redesigning metal wires and thin film transistors to drive secondary pixels, reducing transmittance and increasing backlight module costs.
Innovation Solution
A computing-device-implemented driving method that determines whether liquid crystal pixels are first-position or second-position pixels based on positional information, computing and applying specific pixel signals and luminance signals to reduce angular color shift without requiring primary and secondary pixel designs, thus simplifying manufacturing and improving transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If primary and secondary pixels are designed to compensate for angular color shift, then angular color shift is improved, but device complexity and manufacturing cost increase due to redesigning metal wires and thin film transistors
Solution Approach 1:
The patent changes the driving voltage parameters applied to different pixels. Specifically, it applies different voltage levels (first voltage level and second voltage level) to first pixels and second pixels respectively, without changing the physical structure of metal wires and thin film transistors. This parameter-based approach resolves the contradiction by achieving angular color shift compensation through electrical parameter adjustment rather than structural redesign.
2Object-affected harmful factors
If primary and secondary pixels are designed to compensate for angular color shift, then angular color shift is improved, but panel transmittance decreases due to reduced light-transmissive opening area
Solution Approach 1:
The patent uses voltage parameter differentiation instead of physical pixel subdivision. By applying different voltage levels to different pixel groups, the patent achieves angular color shift compensation without adding physical structures that would block light. This maintains the light-transmissive opening area and preserves panel transmittance while still correcting the angular color shift issue.
3Object-affected harmful factors
If primary and secondary pixels are designed to compensate for angular color shift, then angular color shift is improved, but backlight module cost increases
Solution Approach 1:
The patent achieves angular color shift compensation through driving voltage parameter adjustment rather than physical pixel structure modification. This approach eliminates the need for additional manufacturing steps, special materials, or complex assembly processes that would increase backlight module cost. The solution is implemented through software/control logic that adjusts voltage levels, keeping manufacturing costs low.
4Object-affected harmful factors
If different driving voltages are applied to primary and secondary pixels, then angular color shift is compensated, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses parameter-based differentiation (voltage levels) that can be applied to pixels based on their position in the display panel. This approach is more tolerant to manufacturing variations because it doesn't require extremely precise alignment or customization of metal wires and thin film transistors for each pixel. The voltage parameter adjustment can be implemented through standard driving circuits with reasonable precision requirements.
Data Source
AI summary
Disclosed are driving method and device for driving an LCD apparatus, as well as an LCD apparatus. The driving method includes: receiving an image to be displayed, obtaining a first pixel signal and positional information of each pixel, and looking up the first pixel signal to retrieve a first voltage panel driving signal of the pixel; determining whether each pixel is a first- or second-position liquid crystal pixel; when the pixel is a first-position pixel, computing a second pixel signal based on the first pixel signal and first voltage panel driving signal of the first-position pixel; otherwise when the pixel is a second-position pixel, computing a first luminance signal based on the first voltage panel driving signals of the second-position pixel and of the first-position pixels adjacent to the second-position pixel; and driving the pixels using the second pixel signal and the first luminance signal, respectively.