Display Panel Insulation Thickness for Viewing Angle Color Cast
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Solution Overview
Problem
Large liquid crystal displays face issues with color cast from wide viewing angles, leading to increased power consumption and higher production costs due to complex designs that lower the aperture ratio.
Innovation Solution
A display panel design featuring pixel units with different insulation layer thicknesses between thin film transistors and semiconductor layers, optimizing charge efficiency to reduce color cast without decreasing aperture ratio, using amorphous silicon material and varying the ratio of insulation layer thicknesses between main and sub-pixel portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thin film transistor and sharing capacitor are added to solve color cast from large viewing angle, then color cast problem is improved, but device complexity increases and aperture ratio decreases
Solution Approach 1:
The patent applies local quality by creating different insulation layer thicknesses in different regions of the pixel. Specifically, the first insulation layer thickness in the main pixel portion is different from the second insulation layer thickness in the sub-pixel portion, resulting in different capacitance values that compensate for viewing angle color cast without adding complex transistor structures.
2Object-affected harmful factors
If a thin film transistor and sharing capacitor are added to solve color cast from large viewing angle, then color cast problem is improved, but aperture ratio decreases
Solution Approach 1:
The patent changes the physical parameter of insulation layer thickness to achieve different capacitance values. By controlling the first insulation layer thickness and second insulation layer thickness to have different values, the patent adjusts the capacitance in main and sub-pixel portions to eliminate viewing angle color cast while maintaining the existing pixel structure and aperture ratio.
3Object-affected harmful factors
If complex pixel design with sharing capacitor is used, then color cast from large viewing angle is improved, but production cost increases
Solution Approach 1:
The patent implements local quality differentiation through varying insulation layer thicknesses in different pixel regions. This approach eliminates viewing angle color cast using a simple structural modification that can be manufactured using existing thin-film deposition techniques, avoiding the need for additional transistors or capacitors that would increase production complexity and cost.
Data Source
AI summary
A display panel is provided, which comprises a plurality of the pixel units. Each of the pixel units comprises a main pixel portion having a first thin film transistor and a sub-pixel portion having a second thin film transistor, wherein a second distance is unequal to a first distance. Insulation layers of the two pixel portions are designed to be different thicknesses, so that a color cast problem from a large viewing angle is solved, so as to improve the watching effect, and lower the production cost.