Light Guide Plate Prism Patterns for LCD Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices face issues with brightness uniformity and the moiré phenomenon due to non-uniform light transmission from slim and flat light guide plates, particularly when using light emitting diodes (LEDs) as light sources.
Innovation Solution
A light guide plate with a diffusion pattern on the incident surface, first and second prism patterns on the emitting and opposite surfaces respectively, and a direction change pattern to ensure uniform light distribution and prevent moiré, along with an optical sheet and reflection sheet to enhance light directionality and reduce light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the light guide plate is formed to have a slim and flat shape to meet the demand for slimness and lightweight, then the weight and thickness are reduced, but the light may not be uniformly transmitted to the LCD panel, degrading brightness uniformity and causing moiré phenomenon
Solution Approach 1:
The patent applies local quality by creating specific surface patterns (diffusion pattern, direction change pattern, prism pattern) at different locations on the light guide plate. The diffusion pattern is formed on the incident surface to locally diffuse light, while the direction change pattern and prism pattern are formed on the emitting surface to locally control light direction and uniformity. This localized modification allows the plate to maintain slimness while achieving uniform light transmission.
2Length of stationary object
If the light guide plate is formed to have a slim and flat shape, then the thickness is reduced, but the light may not be uniformly transmitted to the LCD panel, degrading brightness uniformity and causing moiré phenomenon
Solution Approach 1:
The patent applies local quality by creating specific surface patterns (diffusion pattern, direction change pattern, prism pattern) at different locations on the light guide plate. The diffusion pattern is formed on the incident surface to locally diffuse light, while the direction change pattern and prism pattern are formed on the emitting surface to locally control light direction and uniformity. This localized modification allows the plate to maintain slimness while achieving uniform light transmission.
3Volume of moving object
If the light guide plate is formed to have a slim and flat shape, then the device becomes more compact, but the light may not be uniformly transmitted to the LCD panel, causing moiré phenomenon
Solution Approach 1:
The patent applies local quality by creating specific surface patterns (diffusion pattern, direction change pattern, prism pattern) at different locations on the light guide plate. The diffusion pattern is formed on the incident surface to locally diffuse light, while the direction change pattern and prism pattern are formed on the emitting surface to locally control light direction and uniformity. This localized modification allows the plate to maintain slimness while achieving uniform light transmission.
Solution Approach 2:
The patent converts the potential harm of slim plate design (non-uniform light transmission) into a benefit by using the plate's thickness as a medium to embed functional patterns. The diffusion pattern, direction change pattern, and prism pattern are formed within the plate material itself, utilizing the plate's structure to achieve uniform light transmission while maintaining compact dimensions.
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 maintains brightness uniformity and prevents the moiré phenomenon, improving light efficiency and the slimness of LCD devices by diffusing and directing light effectively across the LCD panel.
Implementation Method 1
an incident surface, to which light generated from a light source is incident, including a diffusion pattern formed in a round shape
Implementation Method 2
an emitting surface, through which the light is emitted, including a first prism pattern
Implementation Method 3
a second prism pattern, formed symmetrically to the first prism pattern, through which the light is diffused
Implementation Method 4
an opposite surface, formed opposite to the emitting surface, including a direction change pattern by which the direction of the light is changed toward the emitting surface
Data Source
AI summary
Disclosed herein are a light guide plate, a backlight assembly including the light guide plate, and a liquid crystal display device including the backlight assembly which can uniformly maintain the brightness uniformity and prevent the moiré phenomenon. The light guide plate in accordance with the present disclosure includes: an incident surface, to which light generated from a light source is incident, including a diffusion pattern formed in a round shape; an emitting surface, through which the light is emitted, including a first prism pattern; and an opposite surface, formed opposite to the emitting surface, including a direction change pattern by which the direction of the light is changed toward the emitting surface.