Liquid Crystal Display Light Guide Plate Frame Narrowing
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing the width of the frame around the image display area, particularly on the lateral sides, due to limitations in moldability and reliability of resin injection molding.
Innovation Solution
A liquid crystal display device design that includes a light guide plate with a reflection sheet attached using an adhesive material in a dot or stripe pattern, which reduces the need for a frame by reflecting light internally and minimizing light leakage, while also using double-sided light shielding tape and optional metal frames for further light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame width is reduced to narrow the edge area, then the image display area can be expanded, but the moldability and reliability of resin injection molding deteriorate
Solution Approach 1:
The frame is divided into multiple resin frames (first resin frame and second resin frame) with different functions and structures. The first resin frame provides structural support while the second resin frame focuses on light reflection and shielding, allowing each segment to be optimized independently for both narrow edge area and reliable molding
Solution Approach 2:
Different portions of the frame structure are given different properties: the first resin frame uses a structure optimized for structural integrity, while the second resin frame uses a structure optimized for light reflection and shielding. This local differentiation allows the overall frame to achieve narrow edge area while maintaining reliability in critical regions
2Area of stationary object
If the frame width is reduced to narrow the edge area, then the image display area can be expanded, but the manufacturing precision deteriorates due to fluidity limitations of resin
Solution Approach 1:
The frame is segmented into multiple resin frames that can be manufactured separately with higher precision and then assembled. This segmentation allows each component to be molded within optimal dimensional constraints, avoiding the fluidity limitations that would affect a single large-frame component
Solution Approach 2:
A light guide plate is introduced as an intermediary component between the light source and the frame structure. This allows the frame to be designed primarily for structural support and light management rather than having to precisely control light distribution, thereby improving manufacturing precision
3Stability of the object's composition
If adhesive material is applied to the entire surface of the light guide plate, then the reflection sheet is firmly attached, but light leakage from boundary surfaces increases
Solution Approach 1:
The adhesive material is applied selectively at specific locations (dots or stripes) rather than across the entire surface. This localized application provides sufficient attachment stability at critical bonding points while leaving other areas transparent to light, thereby preventing light leakage
Solution Approach 2:
Instead of applying adhesive across the full surface area, adhesive is applied partially at strategic locations. This partial action is sufficient to achieve the required attachment stability while minimizing the harmful effect of light leakage through excessive adhesive coverage
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 allows for a narrower edge area around the image display, reduces light leakage, and enhances the structural integrity of the backlight by internal light reflection and strategic light shielding, effectively addressing the limitations of traditional frame designs.
Implementation Method 1
the lower surface of the light guide plate includes concaves and convexes formed to cause light that advances in the light guide plate to be reflected inside and to advance toward the upper surface
Implementation Method 2
The frame is formed of a material having a high light reflectance, and reflects light output from side surfaces of the light guide plate to be returned to the light guide plate
Implementation Method 3
an adhesive material that is disposed on the reflection sheet in a planar shape of dots or stripes and attaches the reflection sheet to the light guide plate
Data Source
AI summary
A liquid crystal display device includes: a light guide plate that includes upper, lower and side surfaces; a light emitting element disposed to face an edge surface that is a part of the side surfaces; a reflection sheet that is bent to face the lower surface of the light guide plate and parts of the side surfaces thereof except for the edge surface; and an adhesive material disposed on the reflection sheet in a planar shape of dots or stripes and attaches the reflection sheet to the light guide plate. The lower surface of the light guide plate includes concaves and convexes formed to cause light that advances in the light guide plate to be reflected inside and to advance toward the upper surface. The thickness of the adhesive material is smaller than a maximum value of a height difference of the concaves and convexes.