MEMS Light Valve for Display Contrast
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Solution Overview
Problem
Current liquid crystal display technologies rely on backlights for illumination, leading to incomplete black image representation due to imperfect liquid crystal molecule orientations, resulting in suboptimal contrast and failing to meet high-quality display requirements.
Innovation Solution
A microelectromechanical systems (MEMS) light valve device with a shading unit and swing arm mechanism, integrated into each sub-pixel, controls backlight entry by using a high scattering coated layer to enhance light use efficiency and achieve dynamic contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are used to control light transmission, then the display can be formed by manipulating polarization direction, but the contrast cannot be reduced sufficiently because light still exits from the panel when pixels are off
Solution Approach 1:
The invention divides each pixel into multiple sub-pixels, with each sub-pixel containing an independent light valve device. This segmentation allows individual control of light transmission in each sub-pixel, enabling more precise black level control and improved overall contrast by independently managing light blocking in different regions of the pixel structure.
Solution Approach 2:
The invention introduces a light valve device as an intermediary component between the backlight and the liquid crystal layer. This light valve acts as a preliminary light blocking mechanism that can completely prevent light from reaching certain areas before the liquid crystal layer, ensuring true black representation and improving contrast by eliminating light leakage that occurs with liquid crystal alone.
2Ease of operation
If liquid crystal layer is used to control light transmission through voltage application, then display images can be formed, but light leakage occurs when pixels should be completely off
Solution Approach 1:
The light valve device performs preliminary light blocking action before the light reaches the liquid crystal layer. By pre-blocking light in the light valve, the system ensures that no light can pass through to the liquid crystal layer when the pixel should be off, preventing light leakage and improving black level performance while maintaining ease of operation through independent control.
3Illumination intensity
If MEMS light valve device is integrated into each sub-pixel to control backlight entry, then display contrast is improved and black representation is complete, but device structure becomes more complex
Solution Approach 1:
The invention merges the light valve device with the existing pixel structure by integrating it into each sub-pixel. The light valve is combined with the liquid crystal layer, color filter, and other components in a unified structure, reducing overall device complexity while maintaining the contrast improvement benefits. This merging allows the light valve to work协同 with existing components rather than adding separate complex systems.
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 MEMS light valve device effectively manages backlight entry in each sub-pixel, improving display contrast and overall display effect by allowing complete black representation and reducing light leakage.
Implementation Method 1
A high scattering coated layer is coated on the shading plate, the driving unit and surfaces of the swing arm to raise a light use efficiency.
Implementation Method 2
the driving unit drives the swing arm to rotate the second shading plate in a facing region of the shading zone and a facing region of the photic zone to accomplish state switch of the light valve.
Implementation Method 3
the driving unit can drive the two second shading plates close to the first shading plate to make the second shading plate face the photic zone of the driving substrate for preventing light entering the driving substrate.
Data Source
AI summary
A light valve device includes a driving substrate having a shading zone and a photic zone. A shading unit includes a first shading plate, two driving devices, and second shading plates respectively connected to the two driving devices. The driving devices and the first shading plate are fixed in the shading zone adjacent to the driving substrate. The first shading plate is between the two driving devices. The driving devices are operable to drive the two second shading plates close to the first shading plate to make the second shading plates face the photic zone of the driving substrate for preventing light entering the driving substrate. By locating the light valve device under the sub pixel, the dynamic contrast can be raised to promote the display effect.