Backlight Module Light Guide Plate Uniform Illumination
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Solution Overview
Problem
Conventional LED backlight modules face challenges in maintaining uniform brightness and color consistency due to the fixed distance between light-emitting diodes, which limits the ability to decrease the number of LEDs and increase brightness, thereby increasing costs.
Innovation Solution
The implementation of a backlight module design featuring a bounding frame with first and second light-emitting elements emitting light in different directions, accompanied by reflecting sheets to optimize light distribution, and an optical element comprising a light guide plate and films to ensure uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the distance between LED units is increased to reduce the number of LEDs, then cost decreases, but brightness uniformity deteriorates
Solution Approach 1:
The patent segments the light emission function by introducing a separate light guide plate component that receives light from LEDs and redistributes it uniformly across the display area. This allows fewer LEDs to be used while maintaining brightness uniformity, as the light guide plate divides and spreads the light from each LED to multiple locations.
Solution Approach 2:
The light guide plate acts as an intermediary between the LEDs and the display panel. It receives concentrated light from the LEDs and transforms it into uniform distributed light, enabling cost reduction through fewer LEDs without sacrificing brightness uniformity.
2Quantity of substance
If the number of light-emitting diodes is decreased to reduce cost, then manufacturing cost decreases, but color consistency deteriorates
Solution Approach 1:
The light guide plate segments and redistributes light from fewer LEDs across the entire display area, ensuring uniform color distribution. Each LED's light is divided and spread to multiple locations, maintaining color consistency even with reduced LED count.
Solution Approach 2:
The patent applies local quality by designing the light guide plate with specific optical properties in different regions to control light distribution. The light guide plate ensures that each region receives appropriate light characteristics from the LEDs, maintaining overall color consistency across the display.
3Quantity of substance
If brightness of light emitting diodes is increased to reduce the number of LEDs, then the number of LEDs decreases, but brightness uniformity deteriorates
Solution Approach 1:
The light guide plate segments the bright light from high-intensity LEDs and redistributes it uniformly across the display area. This prevents localized brightness hotspots while maintaining overall high brightness levels, allowing fewer high-power LEDs to be used effectively.
Solution Approach 2:
The light guide plate transforms the point-source light emission from LEDs into a distributed two-dimensional light field across the display panel. This dimensional transformation spreads the light energy uniformly, enabling the use of fewer high-brightness LEDs without compromising uniformity.
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 addresses color shift and brightness variations, allowing for a reduction in the number of light-emitting diodes, thereby decreasing costs while maintaining a wider color gamut and uniform illumination.
Implementation Method 1
A first reflecting sheet is set on the bounding frame, and has a reflecting surface on one side
Implementation Method 2
A second reflecting sheet is set under the bounding frame, and has a second reflecting surface substantially facing upward
Implementation Method 3
an optical element comprising a light guide plate and films to ensure uniform light emission
Data Source
AI summary
A light-emitting unit includes a bounding frame, a first light-emitting element, a second light-emitting element, and a first reflecting sheet. The first light-emitting element and the second light-emitting element are disposed in the bounding frame, and emit light in different directions. The first reflecting sheet is disposed on the bounding frame, and has a reflecting surface on one side away from the bounding frame.