Light Guide Plate Recess for Edge Circuit Board Positioning
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Solution Overview
Problem
Conventional display devices with front-light modules suffer from increased thickness due to the placement of circuit boards on the surface of light guide plates, which hinders the integration of additional components and affects display quality.
Innovation Solution
Incorporating recess portions on the light guide plate's second light-guiding block to house positioning and light-shielding components, allowing for a reduced thickness by relocating the flexible circuit board and light source, and using optical adhesive layers to enhance adhesion and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board is placed on the surface of the light guide plate to fix the light source, then the light source can be securely positioned and powered, but the overall thickness of the display device increases
Solution Approach 1:
The patent relocates the circuit board from the surface plane of the light guide plate to the edge region, utilizing the lateral dimension instead of the vertical stacking dimension. This dimensional shift allows the circuit board to be positioned in the edge region beside the light-incident surface, reducing the overall thickness while maintaining electrical connection and positioning functionality.
Solution Approach 2:
The circuit board is extracted from its conventional position on the light guide plate surface and relocated to the edge region. This extraction removes the thickness-increasing element from the main stacking sequence, allowing the display device to achieve reduced overall thickness while the circuit board continues to perform its functions in the edge region.
2Reliability
If the circuit board is placed on the light guide plate surface, then the light source can be fixed and powered, but additional components cannot be placed in front of the light guide plate without increasing thickness
Solution Approach 1:
By moving the circuit board to the edge region beside the light-incident surface, the patent frees up the surface area in front of the light guide plate. This dimensional reorganization allows additional components such as touch panels, optical films, and other functional layers to be integrated in the optical path without being blocked by the circuit board, thereby enhancing adaptability and versatility.
Solution Approach 2:
The circuit board is taken out from the surface position that would otherwise block component integration. This extraction clears the optical path and surface area, enabling the integration of multiple additional components in front of the light guide plate without requiring increased thickness to accommodate routing or positioning conflicts.
3Reliability
If the optical adhesive layer thickness is increased to accommodate the circuit board, then the circuit board can be properly positioned, but the overall thickness of the display device cannot be effectively reduced
Solution Approach 1:
The patent changes the positioning dimension of the circuit board from vertical (requiring thick optical adhesive layers) to lateral (edge region positioning). This dimensional change allows the circuit board to be securely positioned beside the light-incident surface without increasing the thickness of the optical adhesive layer, as the circuit board is now supported and positioned in the lateral direction rather than requiring vertical clearance.
Data Source
AI summary
A display device includes a display panel, a light guide plate (LGP), a light source, and a positioning component. The LGP is disposed on a display surface of the display panel and has an upper surface and a lower surface opposite to each other, a light-incident surface, a first light-guiding block, and a second light-guiding block. A display area of the display panel corresponds to the first light-guiding block. The second light-guiding block extends outside the display area and has at least one recess portion. The recess portion is located on at least one of the upper surface and the lower surface and extends to the light-incident surface. The light source is disposed beside the light-incident surface. The positioning component is disposed on the second light-guiding block and located in the recess portion. Besides, the positioning component extends outside the recess portion and fixes the location of the light source.