Light Valve Panel Segment Electrodes for LCD Contrast
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Solution Overview
Problem
Liquid crystal displays face limitations in contrast ratio and luminance distribution due to uniform backlight irradiation, leading to poor dark image display and color distortion at side viewing angles.
Innovation Solution
A light valve panel is introduced between the display panel and backlight unit, capable of controlling light incident on each pixel based on image luminance distribution, using segment electrodes connected through a resistance pattern to generate voltage distributions and adjust luminance, thereby improving contrast ratio and reducing color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a uniform backlight unit irradiates light onto the entire screen, then the display panel can be driven with simple structure, but the contrast ratio is limited and dark images cannot be displayed well
Solution Approach 1:
The backlight unit is divided into multiple independently controllable backlight regions corresponding to different blocks of the light valve panel. This segmentation allows each region to provide light independently, enabling localized light transmittance control without requiring complex full-screen control mechanisms, thus improving contrast ratio while maintaining structural simplicity.
Solution Approach 2:
A light valve panel with liquid crystal layers is introduced as an intermediary component between the backlight unit and the display panel. This intermediary controls light transmittance by adjusting liquid crystal orientation in response to applied voltages, enabling precise local light modulation without directly modifying the backlight structure, thereby improving contrast while avoiding complex backlight control.
2Illumination intensity
If blocks are divided into segment electrodes connected through resistance pattern, then voltage distribution can be generated to control luminance, but the electrode structure becomes more complex
Solution Approach 1:
Different blocks of the light valve panel are assigned different voltage levels to achieve local luminance control. Each block can have distinct voltage applied to its segment electrodes, creating spatially varying electric fields that control liquid crystal orientation and light transmittance locally, thereby achieving precise luminance control without requiring uniform complex structures across the entire panel.
Solution Approach 2:
The voltage parameter applied to segment electrodes is varied to control luminance levels. By changing voltage magnitudes and distributions across different blocks and segments, the liquid crystal orientation and light transmittance are dynamically controlled, enabling precise luminance adjustment without adding structural complexity.
3Illumination intensity
If a light valve panel controls light incident on each pixel, then contrast ratio is improved, but manufacturing complexity increases
Solution Approach 1:
The light valve panel is segmented into blocks with segment electrodes that can be manufactured using standard thin-film deposition and patterning techniques. This segmentation approach is compatible with existing manufacturing processes, allowing incremental complexity addition without requiring complete process overhauls, thus improving contrast ratio while maintaining ease of manufacture.
Solution Approach 2:
The light valve panel structure serves multiple functions: it controls light transmittance for contrast improvement, provides luminance distribution control through voltage variation, and maintains compatibility with existing display panel manufacturing processes. This multi-functionality reduces the need for separate manufacturing lines or specialized processes, thereby improving contrast while preserving ease of manufacture.
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 contrast ratio, prevents the moiré and bright line phenomena, and simplifies manufacturing processes, resulting in improved image quality and reduced luminance and color distortion at side viewing angles.
Implementation Method 1
segment electrodes connected through a resistance pattern that enables generation of a voltage distribution to the segment electrodes of each block
Implementation Method 2
A liquid crystal display displays an image by controlling an electric field applied to liquid crystal molecules based on a data voltage and adjusting a light transmittance of pixels
Data Source
AI summary
A light valve panel and a liquid crystal display using the same are discussed. The light valve panel according to an embodiment includes a transparent electrode layer having a plurality of blocks supplied with a voltage through data input lines. The transparent electrode layer has a low resistance or has a high resistance. When a transparent electrode layer has low resistance, each block is divided into a plurality of segment electrodes connected through a resistance pattern. A voltage is distributed to the plurality of segment electrodes of each block based on the resistance pattern. When a transparent electrode layer has high resistance, the voltage distribution in each block is based on a resistance difference that varies based on a distance between voltage feeding positions.