Asymmetrical Light Guide Plate for Edge-Lit Backlight Uniformity
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Solution Overview
Problem
Edge-lit backlight display devices face challenges in achieving uniform luminance due to the minimal number of diffusion sheets, leading to noticeable hot spots and degraded image quality, as they strive to minimize thickness and cost while maintaining appearance and consumer demand for thin display products.
Innovation Solution
A display device with a light guide plate featuring an asymmetrical reflective pattern that includes a central embossed portion, a concave portion, and an outer embossed portion with varying protruding heights, designed to increase light scattering and improve luminance uniformity by adjusting the light source array arrangement and reflective pattern density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of diffusion sheets is reduced to minimize thickness and cost, then the product becomes thinner and more cost-effective, but luminance uniformity deteriorates and hot spots become noticeable
Solution Approach 1:
The reflective pattern is designed with spatially varying properties: the first reflective portion (near the light source) has different reflective characteristics than the second reflective portion (farther from the light source). This local differentiation allows optimized light control in different regions to compensate for the reduced diffusion sheets, maintaining luminance uniformity while achieving thinner design.
Solution Approach 2:
The reflective pattern employs asymmetric design where the reflective portions are positioned and configured differently relative to the light source array. The first reflective portion extends in a direction toward the light source while the second reflective portion has different orientation, creating asymmetric light redistribution that improves uniformity without requiring additional diffusion layers.
2Illumination intensity
If the reflective pattern density is increased to improve luminance uniformity, then hot spots are reduced, but the device complexity increases
Solution Approach 1:
The reflective pattern is segmented into distinct functional portions: a first reflective portion positioned near the light source array and a second reflective portion positioned farther away. Each segment serves a specific function in light redistribution, allowing complex uniformity control to be achieved through modular, manageable segments rather than a uniformly complex pattern across the entire surface.
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 enhances luminance uniformity and prevents field of view degradation by optimizing the reflective pattern's design and light source array placement, effectively mitigating hot spots and improving image quality in edge-lit backlight systems.
Implementation Method 1
a reflective pattern for reflecting light to the front surface of the light guide plate is provided at a rear surface of the light guide plate
Implementation Method 2
a light guide plate arranged behind the display panel to guide light incident upon a side surface facing the edge from the light source array so that the light is projected through a front surface toward the display panel
Implementation Method 3
a light guide plate arranged behind the display panel to guide light incident upon a side surface facing the edge from the light source array
Data Source
AI summary
The present invention relates to a display device and a light guide plate thereof. According to an aspect of the present invention, there is provided a display device, including: a display panel configured to output an image to a front surface of the display device; a light source array arranged along at least one edge of the display device to output light; and a light guide plate arranged behind the display panel to guide light incident upon a side surface facing the edge from the light source array so that the light is projected through a front surface toward the display panel.