Curved LCD Substrate Design for Distance Uniformity
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Solution Overview
Problem
Flat liquid crystal display (LCD) devices experience distance deviation from the viewer's perspective, leading to reduced immersion and image quality due to varying distances from the screen, which worsens with larger sizes.
Innovation Solution
A curved LCD device design with substrates, a liquid crystal layer, and spacers that maintain uniform distances, incorporating a color filter on array structure and light-blocking layers to minimize light leakage and enhance aperture ratio, while the curvature ensures equal distances from the viewer to the center and sides, reducing torsional stress and misorientation of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat LCD device is used, then the structure is simple and easy to manufacture, but distance deviation occurs from the viewer's perspective reducing immersion
Solution Approach 1:
The patent applies curvature to the LCD device by forming the first and second substrates in a curved shape along the longitudinal direction. This curvature allows the display surface to be equidistant from the viewer's eyes, eliminating distance deviation and improving immersion while maintaining manufacturing feasibility through curved substrate formation processes
2Area of stationary object
If the LCD device size is increased, then the display area is larger, but distance deviation worsens reducing viewer immersion
Solution Approach 1:
The curved shape of the substrates allows the display area to be expanded while maintaining equidistance from the viewer. The curvature radius is specifically designed to ensure that the entire display surface, including edges and corners, remains at a uniform distance from the viewer's eyes, thus preventing distance deviation even in large-sized devices
3Shape
If a curved design is implemented, then distance deviation is eliminated improving immersion, but light leakage may increase in corner regions
Solution Approach 1:
The patent applies different spacer heights at different locations to address light leakage in specific corner regions. The fourth column spacer has a greater height than the third column spacer, creating localized compensation for the curvature-induced light leakage in corner regions while maintaining the overall curved benefit of distance uniformity
Solution Approach 2:
The patent changes the spacer height parameter in corner regions to compensate for light leakage. By increasing the spacer height in specific corner areas, the liquid crystal layer thickness is adjusted to maintain proper molecular alignment and prevent light leakage while preserving the curved display's distance uniformity advantage
4Shape
If curved substrates are used, then viewer immersion is improved, but torsional stress increases causing liquid crystal misorientation
Solution Approach 1:
The patent applies different spacer configurations in different regions to manage stress distribution. The fourth column spacer with greater height in corner regions provides localized stress relief, compensating for torsional stress concentration in curved corners while maintaining the overall curved structure's distance uniformity benefit
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 curved design eliminates distance deviation, improves viewer immersion, and reduces light leakage and contrast ratio issues, maintaining high aperture ratios and touch visibility by dispersing stress and optimizing liquid crystal alignment.
Implementation Method 1
When voltages are applied to the pixel and common electrodes, an electric field is induced between the electrodes, and the liquid crystal molecules are arranged by the electric field
Implementation Method 2
The arrangement of the liquid crystal molecules varies depending on the electric field, and transmittance of light from the backlight passing through the liquid crystal layer is modulated by the position of the molecules
Implementation Method 3
a color filter layer in the pixel region of the first substrate and including red, green and blue color filters
Implementation Method 4
a plurality of first light-blocking layers in the display area over the inner surface of the first substrate, each first light-blocking layer disposed between adjacent pixel regions; a second light-blocking layer in the non-display area over the inner surface of the first substrate
Data Source
AI summary
A curved LCD device includes first and second substrates; gate and data lines in a display area on the first substrate and defining a pixel region; a thin film transistor connected to the gate and data lines; a color filter layer in the pixel region; pixel and common electrodes on the color filter layer; first light-blocking layers in the display area over the first substrate; a second light-blocking layer in a non-display area over the first substrate; first and second column spacers in the display area on the second substrate, wherein the first column spacer has a first height, and the second column spacer has a second height; and a third column spacer in the non-display area on the second substrate and having the second height, wherein the third column spacer is in point-contact with the second light-blocking layer when an external force is applied.