Backlight Module LED Distance Compensation
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Solution Overview
Problem
Conventional backlight modules for LCDs suffer from color shifting defects due to differences in luminous efficiency among LEDs, leading to suboptimal white light production, which is exacerbated by the need to add more LEDs or adjust their arrangement, increasing cost and heat generation.
Innovation Solution
A backlight module design featuring a light guide plate and a base with specific arrangement surfaces for LEDs of varying luminous efficiency, where the distance between the LEDs and the base is adjusted to compensate for lower luminous efficiency, allowing for improved coupling and uniform color light emission without increasing the number of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of LEDs with lower luminous efficiency (e.g., green LEDs) is increased to improve color uniformity, then color shifting defect is improved, but cost and heat generation increase
Solution Approach 1:
The patent applies local quality by positioning LEDs with different luminous efficiencies at different distances from the light guide plate. Specifically, LEDs with lower luminous efficiency are placed closer to the light guide plate, while LEDs with higher luminous efficiency are placed farther away. This creates a non-uniform spatial distribution that compensates for the inherent differences in LED performance, achieving color uniformity without increasing the number of LEDs or heat generation.
2Manufacturing precision
If LEDs are repositioned closer to the light guide plate to improve coupling efficiency, then color shifting defect is reduced, but device complexity increases
Solution Approach 1:
The patent implements local quality through a structured arrangement where LEDs are positioned at different distances from the light guide plate based on their luminous efficiency characteristics. The base structure includes multiple arrangement surfaces at different heights, creating a systematic rather than arbitrary configuration. This reduces device complexity by providing a clear design rule: lower efficiency LEDs go on surfaces closer to the light guide plate, while higher efficiency LEDs go on surfaces farther away.
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 enhances the coupling efficiency of LEDs, reduces unnecessary cost and energy consumption, and effectively minimizes color shifting defects by ensuring uniform luminous intensity across different color LEDs, thereby improving the overall backlight performance.
Implementation Method 1
a light guide plate
Implementation Method 2
enhances the coupling efficiency of LEDs
Data Source
AI summary
The present invention provides a backlight module and a display apparatus. The backlight module comprises a light guide plate, a base, a first light emitting diode and a second light emitting diode. The base is disposed at one side of the light guide plate. The first light emitting diode is disposed on a first arrangement surface of the base. The second light emitting diode is disposed on the second arrangement surface of the base. The distance between the first light emitting diode and the bottom surface is longer than the distance between the second light emitting diode and the bottom surface. The present invention can improve color shifting defect and coupling effect of the light emitting diodes.