Liquid Crystal Display Sensing Device Using Time-Division Color Backlight
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Solution Overview
Problem
Conventional liquid crystal displays with touch or image sensing functions have reduced reliability due to physical changes and potential damage from color filters used in image sensing.
Innovation Solution
A sensing device and method that utilize a liquid crystal layer between panels, with infrared and visible light sensors, and a backlight emitting different colors of light, allowing for time-divisional color image sensing without color filters, thereby preventing image damage and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color filters are used in conventional liquid crystal displays for image sensing, then color image sensing capability is achieved, but reliability is reduced due to physical changes and potential damage from dispersion agents
Solution Approach 1:
The patent removes color filters from the liquid crystal display structure, extracting the problematic component that caused reliability issues while preserving color sensing capability through an alternative mechanism using separate red, green, and blue light emitting members and corresponding photodetectors
Solution Approach 2:
The patent segments the color sensing function into separate red, green, and blue sensing channels, each with its own light emitting member and photodetector, eliminating the need for a single color filter and allowing independent optimization of each color channel's reliability
2Measurement precision
If color filters with dispersion agents are used for image sensing, then color separation is achieved, but image damage occurs due to dispersion agent effects
Solution Approach 1:
The patent extracts and removes the color filter layer containing dispersion agents from the display structure, eliminating the source of image damage while maintaining color separation functionality through spatially separated red, green, and blue photodetectors
Solution Approach 2:
The patent creates separate optical paths for red, green, and blue light using distinct light emitting members and photodetectors, copying the color separation function without relying on the problematic dispersion agent mechanism in color filters
3Adaptability or versatility
If physical changes are used for sensing functions in liquid crystal displays, then sensing capability is achieved, but reliability is reduced
Solution Approach 1:
The patent implements a dynamic sensing approach where the liquid crystal layer is selectively activated only when sensing is required, switching between display mode and sensing mode to prevent degradation from continuous physical changes while maintaining full sensing capability
Solution Approach 2:
The patent changes the operational parameters of the liquid crystal layer, controlling its state (display vs. sensing mode) to minimize unnecessary physical changes and improve reliability while preserving sensing functionality through controlled parameter transitions
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
Enables accurate color image sensing by separating colors easily and preventing image damage from color filter dispersion agents, improving sensing reliability and signal-to-noise ratio.
Implementation Method 1
an infrared ray sensor formed in at least one of the lower panel and the upper panel
Implementation Method 2
a visible light sensor formed in at least one of the lower panel and the upper panel
Implementation Method 3
The electric fields align LC molecules in the LC layer so that polarization of incident light is controlled
Implementation Method 4
field-generating electrodes are applied with voltages so that electric fields are generated in the LC layer
Implementation Method 5
a backlight device positioned at an outer surface of the lower panel, wherein the backlight device includes a plurality of light emitting members representing different colors
Data Source
AI summary
The sensing device is provided. A sensing device according to an exemplary embodiment of the present invention includes a lower panel, an upper panel facing the lower panel, a liquid crystal layer positioned between the lower panel and the upper panel, an infrared ray sensor formed in at least one of the lower panel and the upper panel, a visible light sensor formed in at least one of the lower panel and the upper panel, and a backlight device positioned at an outer surface of the lower panel, wherein the backlight device includes a plurality of light emitting members representing different colors and an infrared ray light emitting member.