Backlight Module Mesh Dot Shift and Diffusing Tape
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Solution Overview
Problem
Conventional backlight modules for liquid crystal displays suffer from hotspot issues due to the high directivity of light emitting diodes and the mismatch between the mesh dot layer area and the visible region, leading to bright and dark areas, which are difficult to resolve without complicating the manufacturing process.
Innovation Solution
The mesh dot layer is shifted inward relative to the visible region of the liquid crystal panel, and a diffusing tape is attached to the bottom of the light guide plate, with the tape's position and width calculated to align with the light entrance surface, diffusing light to prevent hotspots and dark lines or bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mesh dot layer area is made greater than the visible region area, then the light guide plate can provide sufficient brightness, but bright and dark areas appear alternately causing hotspot problems
Solution Approach 1:
The patent extracts the problematic mesh dot layer from the visible region area and relocates it to the non-visible region. By shifting the mesh dot layer inward by a first distance, the design removes the source of hotspot problems (alternating bright and dark areas) while preserving the light guide plate's ability to provide sufficient brightness through the diffusing tape and optimized light path.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the light guide plate. The mesh dot layer is strategically positioned only in the non-visible region, while the visible region receives uniform light distribution. This local differentiation allows the system to achieve both sufficient brightness and uniformity without hotspot problems.
2Object-affected harmful factors
If micro structures are formed on the light entrance surface to increase light emitting angle, then hotspot problem is solved, but manufacturing process becomes time-consuming and strenuous
Solution Approach 1:
The patent introduces a diffusing tape as an intermediary element between the light source and the visible region. This diffusing tape serves as a mediator that redistributes light uniformly without requiring complex micro structures on the light guide plate. The mesh dot layer is simplified to a basic pattern in the non-visible region, dramatically reducing manufacturing complexity while still solving the hotspot problem.
Solution Approach 2:
The patent changes the positional parameter of the mesh dot layer by shifting it inward by a first distance into the non-visible region. This parameter change simplifies the mesh dot layer structure from a complex compensation pattern to a basic light distribution pattern, making the manufacturing process easier while maintaining effectiveness in solving hotspot issues.
3Ease of manufacture
If the mesh dot layer area is reduced to match the visible region area, then manufacturing is simplified, but uniform light distribution cannot be achieved
Solution Approach 1:
The patent solves the uniform light distribution problem by utilizing the third dimension (depth) rather than relying solely on the two-dimensional area of the mesh dot layer. By shifting the mesh dot layer inward and using the diffusing tape to scatter light through the light guide plate thickness, the system achieves uniform illumination without requiring the mesh dot layer to cover the entire visible region area.
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
This design effectively eliminates hotspots and dark lines, improving image display quality and visual comfort by providing uniform light distribution to the liquid crystal panel.
Implementation Method 1
The diffusing tape is attached onto the bottom surface corresponding to the light entrance surface for diffusing light in the light guide plate to the light exit surface
Implementation Method 2
be guided by the light guiding design of the light guide plate 12 (e.g. utilizing a mesh dot layer 20 formed on a bottom surface 18 of the light guide plate 12)
Data Source
AI summary
A backlight module is for providing light to a liquid crystal panel having a visible region. The backlight module includes a light guide plate, light emitting units, a mesh dot layer, and a diffusing tape. The light emitting units are disposed at a position corresponding to a light entrance surface of the light guide plate for emitting light to the light entrance surface. The mesh dot layer is disposed on a bottom surface of the light guide plate. A side of the mesh dot layer corresponding to the light entrance surface is shifted inward by a first distance relative to a side of the visible region corresponding to the light entrance surface. The diffusing tape is attached onto the bottom surface corresponding to the light entrance surface for diffusing light in the light guide plate to a light exit surface of the light guide plate.