LCD Display Structure With Pixel-Level Light Leakage Control
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Solution Overview
Problem
Conventional LCD displays suffer from insufficient contrast due to light leakage through polarizers, limiting their dynamic range and making them inferior to OLED displays in high dynamic range playback.
Innovation Solution
An LCD display structure with a backlight control layer that filters light at a pixel level, comprising a first polarizer, a first glass substrate with a liquid crystal layer, and a second polarizer to twist and control polarization angles, combined with a light display layer to block light in dark areas, achieving ultra-high contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional polarizers are used in LCD display, then the polarization degree can reach 90-99%, but light leakage occurs and contrast is limited to 800-2000
Solution Approach 1:
The patent divides the backlight control into multiple independent liquid crystal layers (first liquid crystal layer and second liquid crystal layer), each capable of independently controlling light transmission. This segmentation allows for more precise control of light rays, blocking leakage paths that a single layer cannot eliminate, thereby reducing light leakage while maintaining high polarization degree.
Solution Approach 2:
The patent introduces a polarizing film as an intermediary component between the backlight and the liquid crystal layers. This polarizing film works in conjunction with the liquid crystal layers to enhance the blocking effect on leaked light rays, further reducing light leakage and improving contrast ratio.
2Device complexity
If conventional LCD structure is used, then the device complexity remains low, but contrast ratio is limited to 1000-3000
Solution Approach 1:
The patent segments the display structure into distinct functional layers: backlight unit, first liquid crystal layer, second liquid crystal layer, and color filter layer. Each layer performs a specific function in light control, allowing for precise contrast enhancement without requiring complete redesign of the entire display system.
Solution Approach 2:
The patent employs a nested structure where the first and second liquid crystal layers are stacked within the same display volume, with each layer contributing to light control. This nested arrangement achieves high contrast ratio without significantly increasing the overall display thickness or complexity.
3Measurement precision
If pixel-level backlight control is implemented, then ultra-high contrast is achieved, but device complexity increases
Solution Approach 1:
The patent designs the liquid crystal layers to serve multiple functions: they act as both the display medium for image formation and the backlight control mechanism for contrast enhancement. This multi-functionality eliminates the need for separate dedicated backlight control components, achieving ultra-high contrast without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the backlight control function with the display function by using the same liquid crystal layers for both purposes. The liquid crystal layers simultaneously control light transmission for image display and block backlight in dark areas, achieving pixel-level control without adding separate control mechanisms.
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 proposed structure significantly enhances LCD contrast by several tens to hundreds of times, approaching the levels of OLED displays, by blocking light in dark areas and allowing only minimal brightness, thereby improving the viewing experience.
Implementation Method 1
a first polarizer connected to the backlight layer and configured to convert the light emitted by the backlight layer into polarized light
Implementation Method 2
a liquid crystal layer is disposed between the first lower glass substrate and the first upper glass substrate, and the liquid crystal layer twists a polarization angle of the polarized light
Implementation Method 3
a second polarizer connected to the first upper glass substrate and configured to filter light passing through the first upper glass substrate
Data Source
AI summary
The present invention relates to the field of display, and in particular to an LCD display having an increased contrast structure, comprising: a backlight layer (1), a backlight control layer (2), and a light display layer (3). The backlight layer (1), the backlight control layer (2), and the light display layer (3) are successively connected; the backlight layer (1) is configured to emit a light source; the backlight control layer (2) filters the light source emitted by the backlight layer (1); the light display layer (3) is provided with a light display surface (305), and the light display surface (305) displays visible light filtered by the backlight control layer (2).