Display Device Color Shift Correction Under External Light
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Solution Overview
Problem
Display devices face challenges in maintaining color accuracy and reproducibility under varying external light conditions, as external light influences the color gamut and causes shifts in the colors displayed, leading to reduced image quality.
Innovation Solution
A display device with a liquid crystal layer and a field-sequential light emitter system, where an external light analyzer adjusts the color gamut and a signal adjuster converts pixel input signals to minimize color shifts by comparing and calculating gradation values for each color, and adjusting light emission intensities or pulse widths accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external light is present, then the display device can be used in brighter environments, but color accuracy and gamut are degraded due to color shifts
Solution Approach 1:
The patent implements dynamic adaptation by detecting external light conditions and adjusting display parameters in real-time. The display device changes its color gamut and applies color shift correction based on the detected ambient light, transforming from a static display system to a dynamic one that adapts to varying environmental conditions.
Solution Approach 2:
The patent employs a feedback mechanism where the display device detects external light information, analyzes the color shift, and adjusts its output accordingly. This closed-loop control system continuously monitors the display environment and compensates for color degradation, ensuring color accuracy is maintained despite varying ambient light conditions.
2Manufacturing precision
If color gamut is expanded to improve image quality, then color reproduction is enhanced, but color shift under external light becomes more pronounced
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and storing color shift correction data for various external light conditions. Before displaying content, the system detects the ambient light and retrieves appropriate correction parameters, preventing color shift from occurring in the first place rather than correcting it after the fact.
Solution Approach 2:
The patent changes display parameters dynamically based on external light conditions. By adjusting color gamut settings, brightness levels, and color temperature according to the detected ambient light, the system optimizes color reproduction while minimizing color shift sensitivity to environmental factors.
3Manufacturing precision
If field-sequential light emission is used to improve color accuracy, then color reproduction is enhanced, but complexity of light control increases
Solution Approach 1:
The patent utilizes periodic action through field-sequential light emission, where red, green, and blue lights are emitted in alternating time periods. This temporal separation allows precise control of each color component independently, enabling high color accuracy while using a single light emitter rather than three separate emitters.
Solution Approach 2:
The patent transitions from spatial control (three separate light emitters) to temporal control (single emitter with time-division multiplexing). By adding the time dimension to the control strategy, the system achieves the same color accuracy as three simultaneous emitters but with reduced hardware complexity.
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 reduces color shifts and improves color reproducibility even under external light influence, maintaining high image quality by dynamically adjusting the display's color gamut and light emission parameters.
Implementation Method 1
a light modulation layer and a light source. The light modulation layer is disposed between a pair of transparent substrates and includes a plurality of light modulation devices that have predetermined refractive index anisotropy
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
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 and second translucent substrates; at least one light emitter facing at least one of side surfaces of the first and the second translucent substrates; and a display controller. The display controller includes: an external light analyzer setting, in accordance with a received signal of external light information, a second color gamut different from a first color gamut displayable when the external light is not present; and a signal adjuster converting in color a first pixel input signal into a second pixel input signal that reduces a color shift of a second reproduced color in the second color gamut from a first reproduced color in the first color gamut in accordance with the first pixel input signal.