Light Guide Plate Fixation Members for Slim Backlight Units
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Solution Overview
Problem
Existing backlight units, both edge and direct types, face challenges in achieving slimness and uniform brightness, particularly in large-sized LCD devices, leading to manufacturing difficulties and increased costs.
Innovation Solution
A backlight unit design featuring a plurality of light source packages with metal printed-circuit-boards and light emitting diodes, parallel light guide plates, and a bottom cover with fixation holes and members for secure assembly, which allows for a slimmer configuration and reduced manufacturing costs by eliminating the need for additional fixing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If direct type backlight unit is used to achieve uniform brightness, then brightness uniformity is improved, but device thickness increases making slimness difficult to achieve
Solution Approach 1:
The backlight unit is divided into multiple independent light source packages, each with its own light guide plate. This segmentation allows each module to be optimized independently for both brightness uniformity and thinness, resolving the contradiction between achieving uniform brightness and maintaining slim device thickness.
Solution Approach 2:
The light guide plates are positioned parallel to the light source packages in a vertical arrangement, utilizing the vertical dimension to achieve uniform light distribution while maintaining a thin overall profile. This dimensional reconfiguration allows the system to achieve brightness uniformity without increasing device thickness.
2Reliability
If additional fixing elements are added to secure light guide plates, then assembly reliability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The fixation members are integrated directly into the light guide plates as built-in features rather than separate components. This merging of the fixing function into the light guide plate structure eliminates the need for additional fixing elements, reducing manufacturing complexity while maintaining assembly reliability.
Solution Approach 2:
The light guide plates are designed with self-fixing capabilities through integrated fixation members that secure them directly to the bottom cover without requiring external fixing elements. This self-service approach simplifies the assembly process and reduces manufacturing complexity while ensuring reliable attachment.
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 proposed backlight unit achieves a slimmer LCD device configuration with improved uniformity and reduced manufacturing costs by securely fastening light guide plates to a bottom cover using integrated fixation members, enhancing light distribution and reducing brightness deviations.
Implementation Method 1
The light guide plate 11 is configured to disperse incident light from the light source 12
Implementation Method 2
The light guide plate 11 is configured to disperse incident light from the light source 12
Implementation Method 3
The optical sheets 25 are configured to uniformly diffuse light from the light sources 22
Implementation Method 4
The optical sheets 25 are configured to uniformly diffuse light from the light sources 22
Implementation Method 5
The reflection sheet 14 is configured to reflect light downward-progressing from the light guide plate 11 toward the optical sheets 15
Data Source
AI summary
A backlight unit that includes a plurality of light source packages configured to each include a metal printed-circuit-board (PCB) and light emitting diodes; a plurality of light guide plates disposed parallel to the light source packages, respectively; at least one fixation member formed on an incident surface of each light guide plate corresponding to one side surface of each light guide plate; and a bottom cover configured to include a plurality of fixation holes which are formed to receive and secure the respective fixation members.