Backlight Module Uniform Luminance via Diffuser Plate
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Solution Overview
Problem
Direct-type backlight modules in LCD devices face issues with uneven luminance due to the bright regions over LEDs and dim regions between them, leading to increased manufacturing costs when trying to improve luminance uniformity by adding more LEDs.
Innovation Solution
A backlight module design featuring a grid pattern of mini-LEDs with corresponding lenses that direct light rays to achieve uniform luminance across a rectangular area, reducing the need for additional LEDs and potentially eliminating the need for a diffuser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more LEDs are added to improve luminance uniformity, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
A diffuser plate is introduced as an intermediary component between the LED array and the display panel. The diffuser plate scatters and redistributes the light from the LEDs, converting the non-uniform light distribution into uniform luminance across the display area, thereby eliminating the need to increase LED quantity for uniformity purposes
Solution Approach 2:
The patent uses a cost-effective diffuser plate made from materials like PTFE (polytetrafluoroethylene) or other scattering materials, which is a relatively inexpensive component that can achieve the uniformity effect without requiring additional expensive LEDs
2Illumination intensity
If more LEDs are added to improve luminance uniformity, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The diffuser plate serves as a simple intermediary component that passively redistributes light without requiring complex control systems, additional circuitry, or sophisticated alignment mechanisms, thereby maintaining device simplicity while achieving uniform luminance
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a component with specific scattering properties (the diffuser plate), which modifies the light distribution pattern from non-uniform to uniform without changing the LED array configuration
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 provides improved luminance uniformity without increasing the number of mini-LEDs, reducing manufacturing costs and enhancing display device efficiency.
Implementation Method 1
each LED light source comprises an LED and a corresponding lens disposed above the LED, the corresponding lens directing light rays emitted from the LED onto
Data Source
AI summary
A display device (100) includes a display panel (110), a first light source (E), and second light source (F). The first and second light sources (E, F) are respectively aligned with a first spot (5) and second spot (6) in a direction perpendicular to a substrate (310). The first light source (E) irradiates the first spot (5) and a third spot (M) with luminance of a first value, and irradiates the second spot (6) with luminance of a second value. The first light source (E) irradiates a midpoint (N′) between the first and second spots with a luminance value that is half of the addition of the first value and second value.