Brightness Control Plate for LCD Light Leakage Reduction
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Solution Overview
Problem
Liquid crystal displays (LCDs) experience light leakage in the normally black mode due to inclined incident light not perpendicular to the absorbing axis of the polarization plate, leading to degradation in contrast ratio.
Innovation Solution
A brightness control plate is attached between the lower polarization plate and the dual brightness enhanced film (DBEF) in the display unit to reduce the brightness of inclined incident light, preventing light leakage and improving contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a brightness control plate is attached between the lower polarization plate and the DBEF, then light leakage is reduced and contrast ratio is improved, but device complexity increases
Solution Approach 1:
A brightness control plate is introduced as an intermediary component between the lower polarization plate and the DBEF. This plate selectively controls the brightness of inclined incident light, preventing it from reaching the liquid crystal layer at angles that would cause light leakage in normally black mode, thereby improving contrast ratio without fundamentally changing the existing display structure.
Solution Approach 2:
The brightness control plate is designed to selectively affect only inclined incident light that is not perpendicular to the absorbing axis of the polarization plate. It allows perpendicular light to pass through while blocking or reducing the brightness of inclined light, thereby locally improving the optical properties where needed without affecting the overall structure.
2Manufacturing precision
If the brightness control plate is made thicker, then light leakage reduction is improved, but the display unit thickness increases
Solution Approach 1:
The thickness of the brightness control plate is optimized to achieve the desired light leakage reduction effect. By carefully selecting the thickness parameter, the plate can effectively block inclined incident light while maintaining a compact overall display unit thickness. The thickness is adjusted to provide sufficient optical control without excessive bulk.
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 implementation of a brightness control plate effectively reduces light leakage and enhances the contrast ratio by adjusting the brightness of inclined incident light, resulting in improved display performance in the normally black mode.
Implementation Method 1
a brightness control plate interposed between the lower polarization plate and the DBEF to reduce the brightness of inclined incident light that is not perpendicular to an absorbing axis of the polarization plate
Data Source
AI summary
A liquid crystal display and method of reducing light leakage in a black mode of a liquid crystal display is provided. In the liquid crystal display, a backlight assembly generates light, and a display unit is disposed over the backlight assembly to display an image by using light received from the backlight assembly. A DBEF (dual brightness enhanced film) is attached to a lower polarization plate provided at the display unit. A brightness control plate is interposed between the lower polarization plate and the DBEF to reduce the brightness of an inclined incident light that is not perpendicular to an absorbing axis of the polarization plate.