Variable Thickness Liquid Crystal Layer for Display Brightness
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Solution Overview
Problem
Liquid crystal display devices experience color unevenness due to varying thicknesses of color filters, leading to visible color differences across the display surface, and the additional light transmission control layer increases production costs.
Innovation Solution
A display device configuration with a light guide plate and a display panel having a first section with a relatively large liquid crystal layer thickness for high light transmittance and a second section with a relatively small liquid crystal layer thickness to mitigate brightness and color unevenness, eliminating the need for an additional light transmission control layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the color filter is adjusted for each pixel to reduce brightness unevenness, then brightness uniformity is improved, but color unevenness occurs and manufacturing complexity increases
Solution Approach 1:
The invention applies local quality by creating different liquid crystal layer thicknesses in different display regions. The first display region has a first liquid crystal layer thickness while the second display region has a second liquid crystal layer thickness that is different from the first. This allows each region to be optimized for its specific lighting conditions without requiring complex color filter thickness control, thereby improving brightness uniformity while avoiding color unevenness and manufacturing complexity.
2Illumination intensity
If an additional light transmission control layer is added to control brightness, then brightness uniformity is improved, but production cost increases
Solution Approach 1:
The invention applies parameter changes by varying the thickness parameter of the liquid crystal layer across different display regions. Instead of adding an expensive light transmission control layer, the patent changes the liquid crystal layer thickness parameter to achieve the desired light transmission control. The first liquid crystal layer thickness and second liquid crystal layer thickness are specifically designed to optimize brightness uniformity while avoiding additional manufacturing costs.
3Illumination intensity
If the liquid crystal layer thickness is increased to improve light transmittance, then brightness is improved, but color unevenness becomes more visible
Solution Approach 1:
The invention applies local quality by assigning different liquid crystal layer thicknesses to different display regions based on their specific requirements. The first display region with the first liquid crystal layer thickness is optimized for high brightness, while the second display region with the second liquid crystal layer thickness is optimized to minimize color unevenness. This localized optimization allows each region to achieve its best performance without compromising the other.
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
This configuration maintains high overall brightness, reduces color unevenness, and lowers production costs by eliminating the need for a controlled color filter thickness and additional light transmission control layers.
Implementation Method 1
a first display section included in the display panel and located relatively away from the light source and in which the liquid crystal layer has a relatively large thickness, and a second display section included in the display panel and located relatively near the light source and in which at least a portion of the liquid crystal layer has a relatively small thickness
Data Source
AI summary
A display device includes: a light source; a light guide plate having a light input end face that is at least a portion of an outer peripheral end surface and a light-exit surface that is one of two plate surfaces of the light guide plate and through which the light exits the light guide plate; a display panel including two substrates sandwiching a liquid crystal layer therebetween and configured to display an image by using light from the light-exit surface; a first display section included in the display panel and located relatively away from the light source and in which the liquid crystal layer has a relatively large thickness; and a second display section included in the display panel and located relatively near the light source and in which at least a portion of the liquid crystal layer has a relatively small thickness.