Dual-mode LCD with Fluorescent Layer for Adaptive Brightness
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Solution Overview
Problem
Current liquid crystal display devices lack the capability to seamlessly transition between bright and dark environments, failing to meet user needs for adaptive display modes.
Innovation Solution
A dual-mode liquid crystal display device is developed, featuring a color filter substrate and array substrate with a fluorescent layer at the white sub-pixel position, along with a backlight source that includes independent control of white and ultraviolet light sources, enabling normal color display in bright environments and fluorescent display in dark environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a normal color LCD display is used, then normal display function is achieved in bright environment, but the display brightness cannot be lowered for dark environment
Solution Approach 1:
The display device is designed to perform multiple functions by integrating both normal color display capability and fluorescent display capability into a single device. The color filter substrate incorporates fluorescent materials that can be excited by ultraviolet light, enabling the display to function in both bright environments (normal color mode) and dark environments (fluorescent mode), thus achieving multi-functionality and adaptability without requiring separate display devices.
Solution Approach 2:
The fluorescent layer is selectively applied only to specific sub-pixels (white, red, green, blue sub-pixels) of the color filter substrate, rather than uniformly across the entire display. This localized application allows different regions of the display to have different properties - the fluorescent sub-pixels emit light when excited by UV, while other regions maintain normal color display characteristics, enabling adaptability through local functional differentiation.
2Adaptability or versatility
If a fluorescent layer is added to enable dark environment display, then fluorescent display mode is achieved, but the device structure becomes more complex
Solution Approach 1:
The fluorescent layer is integrated directly onto the color filter substrate during the manufacturing process, merging the fluorescent display function with the existing color filter structure. This combination eliminates the need for separate fluorescent display components or additional layers, thereby achieving dual-mode display capability while minimizing increases in device complexity. The ultraviolet light source is also integrated into the backlight assembly, further consolidating the device structure.
3Ease of operation
If independent control of white and ultraviolet light sources is implemented, then mode switching is enabled, but the control system becomes more complex
Solution Approach 1:
The display device incorporates dynamic control capability that allows switching between normal color display mode and fluorescent display mode based on environmental conditions or user preference. The control system dynamically adjusts the operation of the white light source and ultraviolet light source - in bright environments, only the white light source operates; in dark environments, the ultraviolet light source is activated to excite the fluorescent layer. This dynamic switching capability enhances ease of operation while the control logic remains relatively simple.
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 device effectively switches between normal color display in bright conditions and fluorescent display in dark conditions, meeting user requirements for visibility and adaptability.
Implementation Method 1
the fluorescent layer is excited to emit light, then fluorescent display in a dark environment is achieved
Data Source
AI summary
A dual-mode liquid crystal display device, a color filter substrate and an array substrate are provided. The display device comprises: a color filter substrate, an array substrate assembled with the color filter substrate, and a liquid crystal layer between the color filter substrate and the array substrate. The pixel area of the array substrate comprises red, green, blue and white sub-pixels; and the color filter substrate or the array substrate is provided with a fluorescent layer at the position corresponding to the white sub-pixels.