Reflecting Plate Segmentation for LCD Brightness Uniformity
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Solution Overview
Problem
Liquid crystal display devices suffer from non-uniform brightness due to light concentration at specific areas caused by the curvature of the reflecting plate, leading to hot spots and increased brightness non-uniformity, especially as bezel thickness decreases and light source distance shortens.
Innovation Solution
A supporting member is disposed on the back surface of the reflecting plate to minimize its curvature, creating a uniform light path and reducing light concentration in specific areas by flattening the reflecting plate's surface in the light-entry area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reflecting plate is made thin and bonded to the light guiding plate, then the device complexity is reduced and manufacturing is easier, but the reflecting plate curves causing light concentration and brightness non-uniformity
Solution Approach 1:
The reflecting plate is divided into a first reflecting plate (bonded to the light guiding plate) and a second reflecting plate (floating without bonding). This segmentation allows the first plate to provide structural support while the second plate maintains optimal reflective geometry, preventing curvature-induced light concentration and brightness non-uniformity.
2Area of stationary object
If the bezel thickness is decreased to improve design freedom and maximize active area, then the device dimensions are improved, but the distance between the active area and light source decreases causing increased light concentration and hot spots
Solution Approach 1:
By segmenting the reflecting plate into bonded and floating portions, the invention enables precise control of the light reflection path. The floating second reflecting plate can be positioned to compensate for the reduced distance caused by thin bezels, ensuring uniform light distribution across the active area even when bezel thickness is minimized.
3Use of energy by moving object
If the reflecting plate is curved to accommodate the light source geometry, then the light collection efficiency is improved, but light concentrates in specific areas creating hot spots and search light-type hot spots
Solution Approach 1:
The reflecting plate is segmented into a first portion bonded to the light guiding plate and a second floating portion. This allows the first portion to follow the curved geometry for efficient light collection while the second floating portion maintains a controlled position to distribute light uniformly, preventing hot spots and search light-type hot spots.
Solution Approach 2:
The light guiding plate acts as an intermediary between the light source and the reflecting plate. It guides light from the light source to the reflecting plate in a controlled manner, working in conjunction with the segmented reflecting plate structure to achieve both efficient light collection and uniform distribution, preventing concentration in specific areas.
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 solution effectively minimizes non-uniformity in brightness by preventing light concentration, reducing the occurrence of hot spots and improving overall image quality by maintaining a uniform light distribution across the display.
Implementation Method 1
The reflecting plate reflects a light generated from the light source toward the light guiding plate and improves the light efficiency of the backlight unit
Implementation Method 2
The supporting member is disposed under the reflecting plate and supports at least a part of one surface of the reflecting plate
Data Source
AI summary
Provided is a liquid crystal display device. The liquid crystal display device includes: a liquid crystal display panel; a light source under the liquid crystal display panel; a light guiding plate; a reflecting plate; a guide mold; and a supporting member. The light guiding plate is in contact with one surface of the light source. The reflecting plate is disposed under the light guiding plate. The guide mold accommodates the light source, the light guiding plate, and the reflecting plate therein. The supporting member is disposed under the reflecting plate and supports at least a part of one surface of the reflecting plate.