Backlight Reflection Member with Overhang Seams for Uniform Brightness
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Solution Overview
Problem
The existing backlight units for liquid crystal display devices suffer from uneven brightness, particularly at the corner portions, due to insufficient light distribution, which can be compensated by increasing the number of LEDs, leading to higher manufacturing costs and the need for custom LED boards.
Innovation Solution
A lighting device with a reflection member featuring a square-shaped bottom portion and rising portions with overhangs that prevent light leakage through seams, allowing efficient light distribution without increasing the number of LEDs, thus maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of LEDs is increased to compensate for insufficient light amount at corner portions, then the brightness uniformity is improved, but the manufacturing cost increases
Solution Approach 1:
The reflection member is divided into multiple rising portions (first rising portion, second rising portion, etc.) that extend from the bottom plate toward the light output side. Each rising portion is segmented to form seams between adjacent portions, creating a structured reflection surface that directs light toward corner areas without requiring additional LEDs
Solution Approach 2:
The reflection member acts as an intermediary element between the light source (LEDs) and the display panel. By strategically designing the rising portions and seams of the reflection member, light is redirected and distributed more uniformly across the display, particularly improving corner brightness without adding more light sources
2Illumination intensity
If the number of LEDs is increased to compensate for insufficient light amount at corner portions, then the brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The reflection member is divided into multiple rising portions (first rising portion, second rising portion, etc.) that extend from the bottom plate toward the light output side. Each rising portion is segmented to form seams between adjacent portions, creating a structured reflection surface that directs light toward corner areas without requiring additional LEDs
Solution Approach 2:
The reflection member serves multiple functions simultaneously: it reflects light from the LEDs, directs light toward the display panel, and specifically targets corner areas for improved brightness. This multi-functional design eliminates the need for custom LED board configurations while achieving uniform brightness distribution
3Reliability
If gaps are formed in the seam due to warping deformation of rising portions, then light leakage occurs causing local dark areas, but increasing the number of light sources near the seam increases cost
Solution Approach 1:
The overhang portions are designed in advance to compensate for potential warping deformation of the rising portions. These overhang portions extend beyond the seams and contact adjacent rising portions, preventing gap formation before warping occurs and ensuring continuous light reflection without requiring additional light sources
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 suppresses uneven brightness at low cost by ensuring consistent light output across the display without the need for custom LED boards, enhancing display quality and reducing manufacturing expenses.
Implementation Method 1
a reflection member configured to reflect light and including a square-shaped bottom portion disposed along the bottom plate, and at least two rising portions rising from at least two adjacent sides of the bottom portion toward the light output side
Data Source
AI summary
An object of the present invention is to realize the suppression of uneven brightness at low cost in a lighting device. A backlight unit 12 according to the present invention includes: LEDs 17 as a light source; a chassis 14 including a bottom plate 14a disposed on a side opposite to a light output side with respect to the LEDs 17 and housing the LEDs 17; and a first reflection sheet 22 reflecting light including a square-shaped bottom portion 24 disposed along the bottom plate 14a, and at least two rising portions 25 and 26 rising from at least two adjacent sides of the bottom portion 24 toward the light output side such that a seam J is formed between adjacent side edges 25a and 26a. An overhang portion 28 is formed on the side edge 25a of the first rising portion 25 of the at least two rising portions 25 and 26. The overhang portion 28 overhangs beyond the seam J in a direction from the bottom portion 24 to the second rising portion 26.