LCD Light Shielding Member for Leakage Prevention
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Solution Overview
Problem
Conventional LCD devices experience light leakage between the LED FPCB and the light guide plate, leading to reduced brightness uniformity, especially with high luminous intensity LEDs, which affects the overall brightness and thickness of the device.
Innovation Solution
Incorporating a light shielding member attached to the diffusion plate of the optical sheet on the light guide plate to prevent light leakage, ensuring that light emitted from the optical source is directed uniformly onto the LC panel without escaping through the gaps between the LED FPCB and the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high luminous intensity LED devices are used to increase brightness, then the brightness of the display is improved, but light leakage occurs between the LED FPCB and the light guide plate, causing reduced brightness uniformity
Solution Approach 1:
A light shielding member is introduced as an intermediary component between the LED FPCB and the light guide plate. This light shielding member effectively blocks stray light from leaking into gaps, while allowing the high luminous intensity LED to continue providing bright illumination. The light shielding member acts as a mediator that prevents the harmful side effect (light leakage) without reducing the beneficial effect (brightness).
Solution Approach 2:
The light shielding member is strategically positioned only at specific locations where light leakage occurs (between the LED FPCB and light guide plate), rather than uniformly across the entire structure. This localized approach prevents brightness uniformity issues caused by high-intensity LEDs without affecting the overall brightness output of the display.
2Length of stationary object
If the structure is simplified without additional components, then the device thickness is reduced, but light leakage cannot be prevented
Solution Approach 1:
The light shielding member is implemented as a thin film or sheet structure that can be easily integrated into the existing display assembly. This thin-film approach provides effective light blocking capability while adding minimal thickness to the device, thus preventing light leakage without significantly increasing the overall device thickness.
Solution Approach 2:
The light shielding member is positioned in a specific spatial dimension (between the LED FPCB and light guide plate in the vertical stacking direction) to block light leakage paths. By utilizing this intermediate dimension, the solution prevents light leakage without requiring additional horizontal space or significantly increasing device thickness.
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 enhances brightness uniformity and reduces the thickness of the LCD device by effectively blocking light leakage, resulting in improved optical efficiency and a more uniform illumination across the display.
Implementation Method 1
a light shielding member attached to a space portion of the diffusion plate to prevent light leakage
Data Source
AI summary
Disclosed is a liquid crystal display (LCD) device capable of enhancing brightness uniformity by preventing light leakage. The LCD device comprises an LC panel; an optical source for providing light to the LC panel; a light guide plate coupled to a light emission surface of the optical source; a light emitting diode (LED) printed circuit board (PCB) disposed on the light guide plate and the optical source; an optical sheet disposed on the light guide plate, and having a diffusion plate and a prism sheet on an upper surface of one side corresponding to the LED PCB, the diffusion plate having a light shielding member attached thereto; and a mold frame for accommodating therein the optical source, the light guide plate, and the optical sheet.