Backlight Module Reflector Side Wall Light Leakage
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Solution Overview
Problem
Direct type backlight modules face issues with light uniformity due to excess light luminance reflected from diffusion lenses, leading to display non-uniformity at the edges.
Innovation Solution
A backlight module design incorporating a light leakage feature with holes in the reflector's side wall, arranged in a specific pattern to allow some light rays to pass through, reducing excess light energy reflection and enhancing edge brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If diffusion lenses are attached to light emitting diodes in a direct type backlight module, then light emitting capability is improved, but light uniformity deteriorates due to excess light luminance reflected from the reflector at the edges
Solution Approach 1:
The patent applies local quality by creating different optical characteristics at different locations of the reflector. The side wall of the reflector is designed with light leakage features (holes or transparent portions) specifically at the edge region, while the base remains fully reflective. This local differentiation allows edge regions to leak excess light for uniformity while maintaining high reflectivity in the base for light emission efficiency.
Solution Approach 2:
The patent converts the harmful effect of light reflection at the edges into a beneficial effect. Instead of trying to prevent light from reaching the side wall, the design intentionally allows light to reflect off the side wall and then leak through the light leakage features. This converts the previously harmful reflected light into a useful contribution to edge illumination uniformity.
2Stability of the object's composition
If the number of light emitting diodes is increased to achieve excellent light uniformity, then display quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the light uniformity control function from the light emitting diodes themselves and transfers it to the reflector structure. Instead of adding more LEDs or complex control circuits, the design uses the reflector's geometry and light leakage features to passively regulate light distribution, achieving uniformity without increasing component count.
Solution Approach 2:
The reflector acts as an intermediary element that mediates between the light sources and the display panel. By designing the reflector with specific geometric features and light leakage portions, it controls and redistributes light from the LEDs to achieve uniform illumination without requiring additional active components or complex control systems.
3Use of energy by moving object
If the reflector side wall is made fully reflective to maximize light output, then light efficiency is improved, but edge brightness uniformity deteriorates due to excess light luminance
Solution Approach 1:
The reflector is designed with spatially varying properties: the base portion has high reflectivity for maximum light efficiency, while the side wall includes light leakage features at the edges to control brightness uniformity. This local differentiation allows each region to optimize for its specific function.
Solution Approach 2:
Instead of making the entire reflector partially reflective, the patent applies partial reflectivity only where needed - at the side wall edges. The base remains fully reflective, and only specific portions of the side wall have light leakage features, achieving the desired effect with minimal compromise to overall light efficiency.
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 achieves improved light uniformity at the edges of the backlight module, enhancing display quality by controlling light leakage and reducing sharp brightness, thereby providing a more uniform illumination.
Implementation Method 1
The lens unit is disposed on the light source and configured to diffuse light emitted from the light source
Implementation Method 2
a reflector (108) having a base (104) and a side wall (106) extending from the base (104)
Implementation Method 3
the light leakage feature including holes, some of the light rays pass through the side wall, making at least one portion of the light leak out through the reflector
Data Source
AI summary
A backlight module including a back board, a reflector, at least one light source, at least one lens unit, and a light leakage feature is disclosed. The reflector includes a base and at least one side wall connected to the base and is disposed on the back board. The light source is disposed on the board and emits light. The lens unit is disposed on the light source and configured to diffuse the light emitted from the light source for generating light rays impinging on the side wall. The light-leakage feature is disposed at the side wall and configured to allow some of the light rays to pass through the side wall.