Black Sidewall LED Case for Light Leakage Control
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Solution Overview
Problem
In liquid crystal display devices, reducing the size and thickness of light-emitting diodes (LEDs) leads to light leakage from the sidewalls, causing non-uniform luminance and detrimental effects on display quality due to the inability to effectively shield light from the side surfaces.
Innovation Solution
The LEDs are housed in cases with sidewalls that are colored or painted black, providing a high light-shielding property, which prevents light leakage and ensures that light enters the light guide uniformly, even when the LEDs are minimized in size and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size and thickness of LEDs are reduced, then the thickness or size of backlight devices and liquid crystal display devices is reduced, but light leaks out from the side surfaces causing non-uniform luminance
Solution Approach 1:
The sidewalls of the LED package are colored or painted black to provide high light-shielding property. This color change transforms the transparent or translucent sidewalls into light-blocking surfaces, preventing light leakage while maintaining the reduced thickness design of the LED package.
Solution Approach 2:
The patent converts the potentially harmful light leakage from thin sidewalls into a beneficial solution by applying black coloration. The black color absorbs or blocks the light that would otherwise leak out, turning the thin sidewall from a weakness into an effective light-shielding structure.
2Volume of moving object
If the thickness of the package walls is reduced, then the size of the LED is reduced, but luminance uniformity deteriorates due to light leakage
Solution Approach 1:
The sidewalls are colored black to prevent light leakage, ensuring that even with reduced package size and wall thickness, the luminance remains uniform. The black coloration compensates for the reduced wall thickness by providing effective optical shielding.
3Object-affected harmful factors
If black coloration is applied to sidewalls, then light shielding property is improved, but manufacturing process complexity increases
Solution Approach 1:
The black coloration can be applied through various methods including painting or using black resin material during molding. This approach integrates the light-shielding function into the existing manufacturing process without requiring additional complex steps, as the coloration can be performed during the molding process itself or through simple surface treatment.
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 solution maintains uniform luminance near the light source unit, enhancing the display quality of liquid crystal display devices by effectively blocking unnecessary light emission and ensuring that light is directed towards the intended path.
Implementation Method 1
At least a part of the sidewalls is colored or painted in black. The black coloration absorbs or blocks light that would otherwise leak from the side surfaces, preventing harmful light emission and ensuring uniform luminance.
Data Source
AI summary
According to one embodiment, a light source device includes a light-emitting chip, and a case in which the light-emitting chip is accommodated. The case includes a light-emitting surface which transmits light from the light-emitting chip, and a plurality of sidewalls extending so as to intersect the light-emitting surface. At least a part of the sidewalls is colored or painted in black.