Light Guide Plate Grooves for LCD Uniform Illumination
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Solution Overview
Problem
Liquid crystal display devices using LEDs as light emitting elements face challenges in achieving uniform light distribution due to the scattered nature of luminous points, leading to reduced light radiation in areas near LEDs and non-uniform light angles, which affects display quality.
Innovation Solution
A liquid crystal display device design featuring a light guide plate with grooves on its bottom surface and a reflection surface that adjusts its angle near the LEDs to enhance light reflection and distribution, allowing for increased light radiation and reduced dark areas between LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If grooves are formed in the bottom surface of the light guide plate to radiate light, then light radiation is improved, but the angle of light radiated becomes non-uniform
Solution Approach 1:
The patent applies local quality by making the groove angle variable across different regions of the light guide plate. Specifically, the groove angle is set to a first angle in a first region and a second angle (different from the first angle) in a second region. This allows each region to optimize light radiation according to its specific requirements, thereby achieving both increased light radiation quantity and improved angle uniformity.
2Use of energy by stationary object
If LEDs are used as light emitting elements, then power consumption is reduced, but light distribution uniformity deteriorates due to scattered luminous points
Solution Approach 1:
The patent segments the light guide plate into multiple regions (first region and second region) with different groove angles. This segmentation allows each region to be optimized for light extraction from nearby LEDs, thereby compensating for the scattered nature of LED luminous points and achieving more uniform overall light distribution while maintaining low power consumption.
Solution Approach 2:
The patent implements local quality by assigning different groove angles to different regions of the light guide plate. The first region has a first groove angle optimized for light extraction near LEDs, while the second region has a second groove angle optimized for uniform distribution. This regional differentiation addresses the non-uniform light distribution caused by scattered LED luminous points.
3Illumination intensity
If the light guide plate is made with specific groove structures, then light radiation is enhanced, but device complexity increases
Solution Approach 1:
The patent enhances light radiation by implementing different groove angles in different regions rather than using a uniform structure throughout. This localized optimization allows the light guide plate to achieve enhanced radiation efficiency while maintaining relatively simple groove structures in each region, avoiding the need for complex multi-layer or multi-component systems.
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 increases light radiation near LEDs, reducing dark spots and achieving more uniform light distribution across the display panel, thereby improving display quality and reducing non-uniformity in light angles.
Implementation Method 1
a reflection surface is formed on a surface of the groove for reflecting the light with respect to a radiation surface of the light guide plate
Data Source
AI summary
A liquid crystal display device includes a display panel, a backlight which radiates light to the display panel, a light emitting element which is mounted on the backlight, and a light guide plate on which light from the light emitting element is incident. The light guide plate has an upper surface and a bottom surface. The bottom surface has grooves formed therein delimited by at least one surface which extends at a slant with respect to the bottom surface. A reflection sheet is provided which reflects the light radiated from the bottom surface. The grooves are formed to produce a first light which is reflected on the grooves and a second light which is radiated from the grooves and is reflected on the reflection sheet, and an asymmetric prism sheet is arranged on the light guide plate.