Liquid Crystal Display Insulating Film Thickness Variation
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from color mixing due to light leakage from adjacent pixel regions, particularly noticeable when viewed obliquely, which degrades display quality and reduces the aperture ratio of pixels.
Innovation Solution
A liquid crystal display device configuration with substrates featuring gate lines, data lines, pixel electrodes, and an insulating film where the insulating film has varying thicknesses over colored portions and light-shielding areas, formed using organic or inorganic materials and processed through specific light exposure techniques to minimize color mixing without significantly decreasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the black matrix is enlarged to reduce color mixing, then color mixing is reduced, but the aperture ratio of the pixels decreases
Solution Approach 1:
The insulating film is designed with spatially varying thickness: a first thickness in regions overlapping colored portions and a second thickness (greater than the first) in regions overlapping light-shielding portions. This local differentiation allows the film to provide enhanced light blocking at boundaries without uniformly reducing the aperture area, thus reducing color mixing while maintaining high aperture ratio
Solution Approach 2:
Instead of solving the color mixing problem in the horizontal plane by enlarging the black matrix width, the invention transitions to the vertical dimension by varying the insulating film thickness. The thicker film portion at light-shielding regions provides additional optical path length for blocking light, achieving the same effect as a wider black matrix without sacrificing aperture area
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces color mixing when viewed obliquely while maintaining a high aperture ratio, thereby minimizing display quality deterioration and controlling product costs by utilizing conventional components.
Implementation Method 1
a step of forming an organic layer by coating an organic photosensitive material onto the first substrate, and a step of irradiating the organic layer with light beams
Data Source
AI summary
A liquid crystal display device includes a first substrate and a second substrate disposed in opposition. The first substrate includes gate lines, data lines, pixel electrodes, and an insulating film being superimposed, in plan view, over the gate lines, the data lines, and the pixel electrodes. The second substrate includes a first colored portion transmitting light of a first color, a second colored portion transmitting light of a second color, and a light-shielding portion disposed in a boundary area between the first colored portion and the second colored portion, for blocking transmittance of light of the first color and light of the second color. The insulating film includes a first portion overlapping, in plan view, the first colored portion or the second colored portion, and a second portion overlapping, in plan view, the light-shielding portion and being of thicker film thickness than the first portion.