Display Device Background Color Adaptation
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Solution Overview
Problem
Conventional display devices face challenges in effectively superimposing images on backgrounds while maintaining high visibility, particularly in varying brightness conditions, due to limitations in color reproduction and contrast against diverse background colors.
Innovation Solution
A display device comprising a first and second translucent substrate with a liquid crystal layer and light emitters that control the color of the image based on the background's RGB average gradation values, using a field-sequential system to adjust the voltage applied to the liquid crystal layer for optimal contrast and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light modulation layer transmits incident light when no electric field is generated, then the background is visible through the translucent substrates, but the image contrast and visibility against diverse background colors deteriorates
Solution Approach 1:
The patent employs field-sequential color display where the light modulation layer alternates between transmitting and scattering states in synchronization with sequentially emitted red, green, and blue light from the light source. This periodic switching enables both background visibility during transmission phases and image contrast during scattering phases, resolving the contradiction between these two requirements.
Solution Approach 2:
The light modulation layer dynamically changes its optical state (transmissive or scattering) based on the applied electric field in response to sequentially activated color channels. This dynamic adaptation allows the system to optimize both background visibility and image contrast at different time intervals within each display frame, preventing information loss while maintaining illumination.
2Device complexity
If a fixed voltage is applied to the liquid crystal layer, then the device structure is simple, but the adaptability to varying background colors and brightness conditions deteriorates
Solution Approach 1:
The patent implements dynamic voltage control where the display controller adjusts the voltage applied to the light modulation layer based on the specific color and brightness characteristics of the background. This dynamic adjustment enables the system to adapt to varying background conditions while maintaining a relatively simple overall device structure, as the adaptation is achieved through control logic rather than additional hardware components.
Solution Approach 2:
The system changes the electrical parameter (voltage) applied to the liquid crystal layer according to the background characteristics. By varying the voltage level, the light modulation layer can optimize its scattering or transmitting properties for different background colors and brightness levels, enhancing adaptability without requiring complex structural modifications.
3Device complexity
If the light emitter emits light of a predetermined color, then the light source structure is simple, but the color reproduction accuracy against diverse backgrounds deteriorates
Solution Approach 1:
The light emitter sequentially emits red, green, and blue light in periodic cycles corresponding to the three color channels. This field-sequential approach uses simple predetermined color emissions but achieves accurate color reproduction by temporally separating the color emissions and synchronizing them with the light modulation layer's scattering states, eliminating the need for complex multi-color simultaneous emission structures.
Solution Approach 2:
The display controller uses background color information as feedback to determine the optimal voltage applied to the light modulation layer for each color channel. This feedback mechanism enables accurate color reproduction against diverse backgrounds by adjusting the scattering intensity based on the background characteristics, while the light source itself remains structurally simple with predetermined color emissions.
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 enhances image visibility by adjusting the color of the image to be complementary or primary based on the background's color, improving contrast and visibility across different brightness levels.
Implementation Method 1
a liquid crystal layer including polymer dispersed liquid crystal sealed between the first translucent substrate and the second translucent substrate
Implementation Method 2
the light modulation layer transmits the incident light received from the light source when the electric field is not generated, and scatters the incident light and emits the scattered light to the transparent substrates when the electric field is generated
Implementation Method 3
at least one light emitter facing at least one of a side surface of the first translucent substrate or a side surface of the second translucent substrate
Data Source
AI summary
According to an aspect, a display device includes: a first translucent substrate; a second translucent substrate facing the first translucent substrate; a liquid crystal layer including polymer dispersed liquid crystal sealed between the first translucent substrate and the second translucent substrate; at least one light emitter facing at least one of a side surface of the first translucent substrate or a side surface of the second translucent substrate; and a display controller that controls a color of an image overlapping with a background viewed through the first translucent substrate and the second translucent substrate according to a color of the background.