Light Guide Plate Pattern Design for LCD Bezel Luminance Uniformity
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Solution Overview
Problem
The edge type backlight unit in liquid crystal display apparatuses experiences a hot spot phenomenon due to directional light sources, leading to non-uniform luminance and image distortion, which is not effectively addressed by increasing the number of light emitting diodes or enlarging the bezel size, as these solutions either increase power consumption or reduce the display area.
Innovation Solution
A light guide plate with a pattern unit, comprising a diffusion pattern and a compensation pattern, is used to diffuse light uniformly across the bezel area, reducing the hot spot phenomenon by distributing light within the directivity angle of the light sources and compensating for shaded areas, thereby improving luminance uniformity without increasing power consumption or reducing display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light emitting diodes is increased to overcome the hot spot phenomenon, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by creating different optical patterns in different regions of the light guide plate. Specifically, a first pattern is formed in the bezel area to control light distribution in the shaded area, while a second pattern is formed in the display area to manage light in the emission area. This localized pattern differentiation enables uniform luminance without requiring additional light sources, thereby avoiding increased power consumption.
Solution Approach 2:
The patent changes optical parameters by varying the pattern density, depth, and configuration across different regions of the light guide plate. By adjusting these pattern parameters, the light extraction efficiency is optimized locally - higher extraction in shaded areas and controlled extraction in emission areas - achieving uniform luminance distribution without increasing the number of LEDs or power consumption.
2Illumination intensity
If the bezel size is increased to block the hot spot portion, then luminance uniformity is improved, but display area is reduced
Solution Approach 1:
The patent applies local quality by creating different optical patterns in different regions of the light guide plate. Specifically, a first pattern is formed in the bezel area to control light distribution in the shaded area, while a second pattern is formed in the display area to manage light in the emission area. This localized pattern differentiation enables uniform luminance without requiring additional light sources, thereby avoiding increased power consumption.
Solution Approach 2:
The patent changes optical parameters by varying the pattern density, depth, and configuration across different regions of the light guide plate. By adjusting these pattern parameters, the light extraction efficiency is optimized locally - higher extraction in shaded areas and controlled extraction in emission areas - achieving uniform luminance distribution without increasing the number of LEDs or power consumption.
3Illumination intensity
If light emitting diodes are arranged densely to prevent shaded area formation, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating different optical patterns in different regions of the light guide plate. Specifically, a first pattern is formed in the bezel area to control light distribution in the shaded area, while a second pattern is formed in the display area to manage light in the emission area. This localized pattern differentiation enables uniform luminance without requiring additional light sources, thereby avoiding increased power consumption.
Solution Approach 2:
The patent changes optical parameters by varying the pattern density, depth, and configuration across different regions of the light guide plate. By adjusting these pattern parameters, the light extraction efficiency is optimized locally - higher extraction in shaded areas and controlled extraction in emission areas - achieving uniform luminance distribution without increasing the number of LEDs or power consumption.
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 light guide plate with a pattern unit effectively reduces the hot spot phenomenon by uniformly distributing light across the bezel area, enhancing luminance consistency and maintaining a compact display design.
Implementation Method 1
the pattern unit is configured to diffuse light incident through the incident plane in the first direction in the bezel area
Data Source
AI summary
Light can be uniformly distributed in the bezel area by diffusing the light in the bezel area blocked by an upper case, or by providing an optical pattern for light concentration. Accordingly, the brightness of light is similar for all positions at the boundary between the bezel area and the display area, thereby solving the hot spot problem caused by a brightness difference depending on position.