MEMS Reflective Plate for Dynamic Contrast in Backlight Displays
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Solution Overview
Problem
Conventional liquid crystal displays 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
Incorporating a MEMS reflective plate with a rotating reflective sheet and driving unit into the display panel, allowing for 0-360° rotation and controlled light reflection between pixel areas to enhance dynamic contrast and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are used between two parallel glass substrates to control light transmission, then the display can be made thin and power-saving, but the black image cannot be completely achieved due to imperfect molecular orientations, resulting in reduced contrast
Solution Approach 1:
The patent introduces a movable reflective plate that can dynamically adjust its position and orientation to control light reflection. By making the reflective plate movable rather than fixed, the system achieves dynamic control over light paths, enabling complete light blocking for black display while maintaining structural efficiency
Solution Approach 2:
The reflective plate is divided into multiple independent reflective units, each corresponding to a pixel area. This segmentation allows independent control of light reflection for each pixel, enabling precise black level control without affecting other pixels, thereby achieving high contrast ratios
2Illumination intensity
If a reflective plate is added to control light reflection for improving contrast, then display quality is enhanced, but the device structure becomes more complex
Solution Approach 1:
The reflective plate serves multiple functions: it reflects light to pixel areas, blocks light for black display, and can be positioned at different angles for various display modes. By making this single component multi-functional, the patent avoids adding multiple separate components, thus enhancing display quality while limiting structural complexity increase
Solution Approach 2:
The reflective plate is designed as a thin, flexible structure that can be easily positioned and controlled. This thin-film approach minimizes the added thickness and structural bulk, allowing the system to achieve improved display quality without significant increases in device complexity or size
3Illumination intensity
If the reflective plate rotates to control light reflection between pixel areas, then dynamic contrast is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The reflective plate is designed to rotate and position itself based on control signals without requiring complex external positioning mechanisms. The driving unit provides torque while the plate's own structure and magnetic properties enable it to achieve and maintain the required angular positions, reducing manufacturing precision requirements for external positioning components
Solution Approach 2:
The system controls light reflection by changing the rotation angle parameter of the reflective plate. By using continuous angular adjustment rather than discrete positions, and by controlling the plate through magnetic fields or electrostatic forces, the system achieves precise angular control without requiring mechanical precision in the driving mechanism
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 effectively controls light reflection between pixel areas, improving dynamic contrast and reducing power consumption while maintaining high reflectivity, thereby enhancing the display panel's performance.
Implementation Method 1
the driving unit is employed to drive the reflective sheet to rotate
Implementation Method 2
the reflective sheet is located to reflect light in a pixel off area to an adjacent pixel on area
Data Source
AI summary
The present invention provides a display panel, comprising a brightness enhancement film, a light guide plate and a backlight source, and the brightness enhancement film is located to stack with the light guide plate, and the backlight source is located at a lateral side of the light guide plate, wherein the display panel further comprises a MEMS reflective plate located at a bottom of the light guide plate, and the MEMS reflective plate comprises a control substrate and reflective units, and the control substrate is employed to control working statuses of the reflective units, and the reflective unit comprises a driving unit located at the control substrate and a reflective sheet rotatably connected to the driving unit, and the driving unit is employed to drive the reflective sheet to rotate.