Variable Reflectivity Reflector for Display Light Control
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Solution Overview
Problem
Current liquid crystal display devices primarily regulate light through adjusting the luminance of the light source, lacking effective methods for local and global control of light rays, which limits the dynamic range and uniformity of the display.
Innovation Solution
A reflector with a first and second electrode layer forming a variable electrical field, where oppositely charged light reflective and absorptive particles are distributed, allowing for control of reflectivity by adjusting the electrical field, enabling both local and global light regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the light source is adjusted to regulate light rays, then the global luminance control is improved, but the local light regulation capability deteriorates
Solution Approach 1:
The reflector is divided into multiple independently controllable regions through segmented electrode structures (first electrode layer with multiple electrodes, second electrode layer with corresponding electrodes). Each region can be controlled by applying different voltages to specific electrode pairs, enabling local light regulation while maintaining overall luminance control.
Solution Approach 2:
The reflector utilizes dynamically adjustable particle distribution through variable voltage application. By changing the voltage between electrode layers, the distribution of light-reflecting and light-absorbing particles can be dynamically adjusted, allowing the reflector to adapt between different light regulation modes (local and global) and achieve versatile light control.
2Ease of manufacture
If a fixed reflector structure is used, then the manufacturing simplicity is improved, but the light regulation flexibility deteriorates
Solution Approach 1:
The reflector employs particles with different optical properties (light-reflecting and light-absorbing particles) that can be moved between different positions by changing the electrical parameter (voltage) applied to the electrode layers. This allows a single structure to achieve multiple light regulation states without requiring multiple fixed reflector configurations.
Solution Approach 2:
The invention replaces complex mechanical adjustment mechanisms with an electrical field-based particle control system. Instead of using movable mechanical components to adjust reflectivity, the patent uses electric fields to move charged particles, significantly simplifying the mechanical structure while maintaining high light regulation flexibility.
3Device complexity
If only light source luminance adjustment is used for light regulation, then the device complexity is reduced, but the display dynamic range deteriorates
Solution Approach 1:
The invention introduces an intermediary component (the controllable reflector with particle layers) between the light source and the display panel. This intermediary actively modulates the light before it reaches the display, providing an additional control dimension that extends the display's dynamic range without requiring significant changes to the light source itself.
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
This solution allows for precise regulation of reflectivity, enhancing the dynamic range and uniformity of the display by moving particles in response to electrical signals, thereby improving the luminance control of liquid crystal display devices.
Implementation Method 1
a first electrode layer and a second electrode layer opposite to and spaced apart from each other; the first electrode layer and the second electrode layer are configured to form a variable electrical field therebetween
Implementation Method 2
moving the light reflective particles and the light absorptive particles in opposite directions through the action of the electrical field
Data Source
AI summary
A reflector, and a method for controlling the same, a backlight module, and a display device are provided in the embodiments of the disclosure, the reflector including a first electrode layer and a second electrode layer opposite to and spaced apart from each other; the first electrode layer and the second electrode layer are configured to form a variable electrical field between the first electrode layer and the second electrode layer in response to electrical signals applied respectively on the first electrode layer and the second electrode layer; and light reflective particles and light absorptive particles are distributed in a space therebetween, the light reflective particles and the light absorptive particles being charged oppositely, the light reflective particles reflecting light rays while the light absorptive particles absorbing light rays, respectively.