Serration Pattern on Light Guide Plate Side for Edge-Lit Backlight
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Solution Overview
Problem
Edge-lit back light units in liquid crystal displays suffer from reduced light entrance efficiency due to the thickness and number of light sources, leading to lower brightness and non-uniform light distribution, necessitating an improvement in light guide plate design to maintain image quality.
Innovation Solution
A serration pattern is formed on the side of the light guide plate with varying depths in the upper/lower portions and center, using a serration core and fixing plate to transfer the pattern while maintaining the plate's thickness, thereby enhancing light entrance efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the light guide plate and the number of light sources are reduced to reduce weight and thickness of the display device, then the weight and thickness are reduced, but dark portions are generated between point light sources and light entrance efficiency is lowered
Solution Approach 1:
The patent applies local quality by creating different serration depths at different locations on the light guide plate. The center portion has a greater serration depth than the upper and lower portions, which compensates for the reduced light distribution in the center area caused by using fewer light sources. This localized variation in serration depth ensures uniform light entrance efficiency across the entire light guide plate while maintaining reduced thickness.
2Illumination intensity
If a serration pattern is formed on the side of the light guide plate to improve light entrance efficiency, then light entrance efficiency is improved, but the shape of the side may be deformed and thickness may not be maintained
Solution Approach 1:
The patent uses local quality by forming serrations with different depths at different locations. The varying serration depths (greater in center, lesser in upper/lower portions) are specifically designed to improve light entrance efficiency in different areas while maintaining overall shape integrity and thickness uniformity of the light guide plate.
Solution Approach 2:
The patent applies dimensionality change by transitioning from a flat side surface to a three-dimensional serrated surface. The serration pattern introduces depth variation (z-dimension) to the originally two-dimensional side surface, enabling improved light entrance efficiency while maintaining the external轮廓 and overall thickness of the light guide plate.
3Illumination intensity
If serration patterns with different depths are formed in upper/lower portions and center portion to uniformly control light entrance efficiency, then light distribution uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality through a systematically designed serration pattern where the center portion has a greater serration depth than the upper and lower portions. This localized differentiation is achieved through a coordinated movement between the pressing member and support member, creating the desired depth variation without requiring excessively complex manufacturing equipment.
Solution Approach 2:
The patent applies dynamics by using a pressing member that can move in the thickness direction of the light guide plate and a support member with variable height. This dynamic configuration allows the system to create different serration depths at different locations through coordinated movement, achieving uniform light distribution while maintaining manufacturing feasibility through controlled motion rather than static complex structures.
Data Source
AI summary
An apparatus for forming a serration pattern on a light guide plate having a top surface emitting a light, a bottom surface opposite to the top surface, and at least one side surface, arranged between the top surface and the bottom surface, as an incident surface. The apparatus includes a base plate supporting the bottom surface of the light guide plate; a fixing plate facing the top surface of the light guide plate with a predetermined interval; and a serration core transferring the serration pattern onto the at least one side surface of the light guide plate by a thermal pressing process causing a thickness deformation of the light guide plate. Further, the fixing plate induces a changed thickness of the light guide plate to be uniform by limiting a thickness change amount of the light guide plate to the predetermined interval.