Reflective Sheet Layout for LCD Edge Hotspot Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) panels suffer from light distribution issues, resulting in dark shadows at the peripheral sides due to inadequate light transmission, necessitating close placement of light sources which can lead to hotspot generation.
Innovation Solution
A display module with a reflective sheet inside the bottom chassis, featuring a sheet bottom portion and obliquely formed sheet side surface portion with light adjustment features like slits, holes, or diffusion layers to adjust and disperse light, reducing hotspot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is disposed close to the side portions of the display module to prevent dark shadows at the peripheral side, then light distribution to peripheral regions is improved, but hotspots are generated at the peripheral side
Solution Approach 1:
The reflective sheet is designed with different surface characteristics in different regions: the first surface has a reflective layer to reflect light, while the second surface has a light-transmitting layer with a specific refractive index to control light transmission. This local differentiation allows the peripheral regions to receive adequate light without generating hotspots, as each surface performs its specific optical function optimally
Solution Approach 2:
The patent changes the refractive index parameter of the light-transmitting layer to be between 1.3 and 1.7, which optimizes light transmission control. By adjusting this physical parameter, the system achieves balanced light distribution to peripheral regions while preventing excessive light concentration that would cause hotspots
2Use of energy by moving object
If a reflective sheet is used to reflect light toward the front of the display panel, then light utilization efficiency is improved, but light uniformity across the display panel deteriorates
Solution Approach 1:
The reflective sheet is constructed as a composite structure with two distinct surfaces: a first surface with a reflective layer for high light reflection, and a second surface with a light-transmitting layer having controlled refractive index for uniform light transmission. This composite design enables the sheet to simultaneously achieve high light utilization efficiency through reflection and maintain light uniformity through controlled transmission, resolving the contradiction between these two requirements
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 effectively reduces hotspot generation at the peripheral sides of the display panel by optimizing light distribution, ensuring even illumination and minimizing dark shadows.
Implementation Method 1
a reflective sheet disposed inside the bottom chassis to allow light illuminated from the backlight unit to be reflected forward
Implementation Method 2
a sheet side surface portion which is obliquely formed to face a rear surface of the display panel
Data Source
AI summary
Display apparatus includes LEDs, bottom chassis to accommodate the LEDs; and reflective member disposed on the bottom chassis. The reflective member includes a reflective bottom portion, and a reflective inclined portion obliquely formed to face a rear surface of the display panel which includes first regions that respectively correspond to LEDs located adjacent to the reflective inclined portion, and second regions each provided between two neighboring first regions and has a reflective characteristic different from a reflective characteristic of a neighboring first region. Second regions and neighboring first regions are on the reflective inclined portion having a uniform incline angle with respect to a side edge of the reflective bottom portion, the first regions include a group of light adjusting members, and the group of light adjusting members of each of the first regions is disposed to correspond to one of the LEDs disposed adjacent to the reflective inclined portion.