Light Guide Plate Dot Diameter Gradient for LCD Brightness Uniformity
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Solution Overview
Problem
Existing side-lit type LED backlight sources suffer from nonuniform light emission due to the uniform diameter design of dots on the light guide plate, leading to brightness unevenness and hotspots in LCD devices.
Innovation Solution
A light guide plate design where the diameter of dots increases progressively from the center to both sides in the same row and along the direction far from the LED lamps, with larger diameters in regions corresponding to weaker light emission angles, and the use of projections with higher refractive indices on the light-incident side to improve light refraction and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dots with uniform diameter are used on the light guide plate, then the manufacturing process is simple, but the light emission uniformity deteriorates causing brightness unevenness and hotspots
Solution Approach 1:
The patent applies local quality by varying the dot diameter according to its position on the light guide plate. Dots closer to the LED have smaller diameters while dots farther away have larger diameters, creating position-dependent optical properties that compensate for the directional light emission characteristics of LEDs and achieve uniform overall illumination.
Solution Approach 2:
The patent changes the geometric parameter (diameter) of the dots based on their longitudinal distance from the LED. By progressively increasing the dot diameter from the LED side toward the display screen side, the system compensates for the angular distribution of LED light emission to achieve uniform brightness across the display area.
2Illumination intensity
If dots with larger diameter are placed farther from LEDs, then light-educing performance improves, but the manufacturing complexity increases due to non-uniform diameter requirements
Solution Approach 1:
The patent implements local quality by making dot diameter position-dependent rather than uniform. Each dot's diameter is specifically optimized for its location relative to the LED, with smaller diameters near the LED and progressively larger diameters toward the display screen, achieving optimal light distribution while maintaining manufacturability through a systematic gradient design.
3Device complexity
If uniform dot diameter is used, then device complexity is low, but brightness uniformity across the screen deteriorates
Solution Approach 1:
The patent introduces a systematic parameter change in dot diameter along the longitudinal direction. By defining a gradient relationship where dot diameter increases with distance from the LED, the system achieves brightness uniformity across the display screen while maintaining relatively simple manufacturing processes through a predictable dimensional variation pattern.
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 design enhances the uniformity of emergent light, reduces light mixing distance, and prevents hotspots by optimizing light intensity distribution and refraction, resulting in improved brightness uniformity across the LCD screen.
Implementation Method 1
a plurality of dots 131 arranged at intervals are disposed on the light guide plate 13 and configured to change the direction of light emitted by the LED lamps 11 at a side by means of reflection
Implementation Method 2
change the direction of light emitted by the LED lamps 11 at a side by means of reflection, scattering and the like
Implementation Method 3
the use of projections with higher refractive indices on the light-incident side to improve light refraction and mixing
Data Source
AI summary
A light guide plate used for an LED backlight source. The LED backlight source comprises a plurality of LED lamps. The light guide plate comprises a light guide plate body (24). The light guide plate body (24) is provided thereon with a plurality of dots (242), and there is a light guide region in the light guide plate body (24). In the light guide region, the diameters of the dots in the same dot row progressively increase from the middle to either side, and diameters of the dots in the same dot column progressively increase in the direction away from the LED lamps.