Reflection Sheet Segmentation for Edge-Light Luminance Uniformity
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Solution Overview
Problem
Edge light type light source devices for liquid crystal panels face issues with wrinkles and deflection in the reflection sheet due to humidity, temperature, and thermal expansion differences, leading to luminance unevenness in the displayed image.
Innovation Solution
A light source device configuration using a reflection sheet with a first reflection sheet piece pinched by the light guide plate and an opposite member, and a second reflection sheet piece slidably sandwiched between the first reflection sheet piece and the light guide plate or opposite member, allowing for free expansion and contraction to prevent wrinkles and deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reflection sheet is fixed rigidly to prevent position shift, then the position stability is improved, but wrinkles and deflection occur due to thermal expansion differences
Solution Approach 1:
The reflection sheet is divided into a fixed portion and a movable portion. The movable portion can expand and contract in the thickness direction in response to thermal expansion differences between the light guide plate and reflection sheet, preventing wrinkles and deflection while maintaining position stability through the fixed portion.
Solution Approach 2:
The reflection sheet is segmented into multiple functional regions: a fixed portion that maintains position stability, and a movable portion that accommodates thermal expansion. This segmentation allows different parts of the reflection sheet to serve different purposes, resolving the contradiction between stability and shape maintenance.
2Shape
If the reflection sheet is made loose to allow free expansion, then wrinkles and deflection are prevented, but the position stability deteriorates
Solution Approach 1:
The reflection sheet incorporates a movable portion that can dynamically adjust its position in the thickness direction based on thermal conditions. This dynamic capability allows the sheet to prevent wrinkles while maintaining overall position stability through the fixed portion.
Solution Approach 2:
By segmenting the reflection sheet into fixed and movable portions, the invention allows the movable portion to provide the necessary flexibility for expansion without compromising the position stability provided by the fixed portion.
3Reliability
If a complex fixing structure with insertion parts and receiving parts is used, then position stability is improved, but device complexity increases
Solution Approach 1:
The invention uses a simple fixed portion that can be easily attached to the light guide plate, avoiding complex fixing structures. The dynamic adjustment is achieved through the movable portion's ability to expand and contract, not through complex mechanical fixing mechanisms.
Solution Approach 2:
The invention merges the fixing function and the expansion accommodation function into a single integrated structure consisting of a fixed portion and a movable portion, eliminating the need for separate complex fixing mechanisms like insertion parts and receiving parts.
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 configuration effectively prevents wrinkles and deflection in the reflection sheet, ensuring even light distribution and maintaining image brightness by allowing the second reflection sheet piece to slide and expand freely, thus addressing the thermal expansion issues.
Implementation Method 1
a light guide plate (5) which emits light made incident thereon through one surface (5a)
Implementation Method 2
a reflection sheet (6) which has one surface (6a) facing the other surface (5b) of the light guide plate and reflects the light made incident on the light guide plate to one surface (5a) side of the light guide plate
Data Source
AI summary
Provided are a light source device which includes a light guide plate configured to emit light made incident thereon through one surface thereof, a reflection sheet which has one surface facing the other surface of the light guide plate and is configured to reflect the light made incident on the light guide plate to one surface side of the light guide plate, and an opposite member oppositely disposed to the other surface of the reflection sheet, such that an occurrence of wrinkles and deflection in the reflection sheet may be prevented with a simple configuration, while surely fixing the position of the reflection sheet, and a display apparatus including the light source device.The reflection sheet includes a first reflection sheet piece and a second reflection sheet piece, wherein the first reflection sheet piece is pinched by the light guide plate and the back cover, and the second reflection sheet piece is held by the first reflection sheet piece.