Backlight Module Silica Gel Layer Light Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional direct-type LED backlights suffer from thickness issues, non-uniform light emission, and poor adjustment of backlight areas due to limited LED light sources and increased optical distance requirements.
Innovation Solution
A backlight module incorporating a circuit substrate with LED chips and a silica gel layer that diffuses light, optionally with a phosphor layer and three-dimensional microstructures on the silica gel layer, to enhance light uniformity and reduce module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between the backlight source and the diffusion plate is increased to improve light uniformity, then the light emission uniformity is improved, but the thickness of the backlight module increases
Solution Approach 1:
A liquid crystal layer is introduced as an intermediary substance between the backlight source and the diffusion plate. This liquid crystal layer has adjustable optical properties that enable it to homogenize light distribution without requiring a large physical distance, thus achieving uniform light emission while maintaining a compact module thickness.
Solution Approach 2:
The optical properties of the liquid crystal layer are dynamically adjusted by changing parameters such as voltage applied to the liquid crystal. This allows the liquid crystal layer to transition between different optical states, optimizing light uniformity distribution while maintaining a fixed, compact module structure with reduced thickness.
2Adaptability or versatility
If the number of LED light sources is increased to improve local dimming effect, then the adjustment effect of backlight area is improved, but the device complexity increases
Solution Approach 1:
The backlight module is divided into multiple independently controllable regions or zones. Each region can be adjusted separately through the liquid crystal layer's spatially selective optical control, enabling local dimming effects without requiring a corresponding increase in the number of LED light sources. This segmentation allows complex backlight patterns to be achieved with a simpler LED arrangement.
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 more uniform light emission and reduces the thickness of the backlight module, improving light distribution and energy efficiency while maintaining a compact design.
Implementation Method 1
the first silica gel layer makes the light emitted from the LED chips more diffuse
Implementation Method 2
the phosphor layer has a thickness less than 0.15 mm... so that the light emitted from the LED chips is uniformly illuminates the phosphor layer
Data Source
AI summary
A backlight and a liquid crystal display. The backlight includes: a circuit substrate, a plurality of LED chips and a first silica gel layer. The plurality of LED chips are fixed by means of die bond on the circuit substrate, and the first silica gel layer is applied to the circuit substrate and wraps the plurality of LED chips. The first silica gel layer makes light emitted by the LED chips more diffuse, thus enhancing light emission uniformity of the backlight and reducing a thickness of a backlight module.