Matrix Electrode Light Controller for Local Dimming
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Solution Overview
Problem
Conventional liquid crystal display apparatuses with local dimming function do not effectively limit the area that light from the backlight reaches, resulting in unnecessary light provision in certain areas.
Innovation Solution
A display apparatus comprising a display device with a light guiding plate and a light controller that includes a substrate with light control areas, electrodes arranged in a matrix, and circuitry to control light transmittance, allowing for precise adjustment of light emission to match image brightness, thereby reducing unnecessary light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight-driving control is used to change light intensity in accordance with image brightness, then local dimming function is achieved, but the area that light reaches is not limited resulting in unnecessary light provision
Solution Approach 1:
The light control panel is divided into multiple light control areas (first light control area and second light control area) that can be independently controlled. Each light control area has its own electrode arrangement that can be selectively activated to control light transmission in specific regions, allowing precise limitation of light reach areas.
Solution Approach 2:
Different regions of the display apparatus are provided with different light transmittance characteristics by controlling specific electrode areas. The first and second light control areas have different electrode arrangements that create distinct local optical properties, enabling each area to independently adjust light transmission based on local image requirements.
2Loss of energy
If light control areas with matrix electrodes are introduced to limit light reach, then unnecessary light provision is reduced, but device complexity increases
Solution Approach 1:
The light control panel integrates multiple functional layers including substrate, electrode arrangements, insulating films, and light control areas into a single unified structure. The first and second electrode arrangements are combined within the same panel, allowing coordinated control of light transmission across different regions through integrated circuitry.
Solution Approach 2:
The light control panel serves multiple functions: it acts as both a light transmission control mechanism and a spatial segmentation device. The same structural elements (substrate, electrodes, insulating films) perform both mechanical support and optical control functions, reducing the need for separate components.
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 enables accurate local dimming, ensuring that only the necessary amount of light is provided to the display area, enhancing image quality and reducing energy consumption by minimizing light wastage.
Implementation Method 1
a liquid crystal layer provided between the first substrate and the second substrate
Data Source
AI summary
According to an aspect, a display apparatus includes: a display device that includes a display area in which a plurality of pixels are provided; an illuminator that includes a light guiding plate opposed to the display area and a light source configured to emit light to the light guiding plate; and a light controller configured to adjust an amount of light emitted from the illuminator. The light controller includes: a first substrate provided with a plurality of light control areas opposed to the display area; a plurality of electrodes arranged in a matrix in each of the light control areas; circuitry configured to control light transmittance of each of the light control areas; and a plurality of wiring lines that couple the circuitry and the electrodes.