Viewing Angle LCD Panel Control for Hue-Consistent White Display
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Solution Overview
Problem
Existing display devices with viewing angle control panels experience a difference in hue when switching between visible and non-visible states due to the operation of liquid crystal molecules, causing discomfort to users.
Innovation Solution
A display device with a liquid crystal display panel and an electro-optical viewing angle control panel, controlled by a control circuit, operates in modes that maintain equal chromaticity of pixels between viewing angle states by adjusting the potential difference between electrodes and adjusting the luminance of sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal molecules operate in the viewing angle control panel to switch between visible and non-visible states, then the viewing angle control is achieved, but the hue of the image visually recognized by a person on the front passenger seat differs between states
Solution Approach 1:
The patent applies parameter changes by adjusting the luminance of sub-pixels (red, green, blue) independently based on the operating mode of the liquid crystal display panel. When the panel operates in a state where liquid crystal molecules are active, the control circuit adjusts the luminance values of sub-pixels to compensate for hue shifts, thereby maintaining consistent color perception across different viewing angle states.
2Ease of operation
If the potential difference between electrodes is changed to control viewing angle, then the electro-optical device functions, but chromaticity of pixels changes between modes
Solution Approach 1:
The patent implements feedback by using the control circuit to detect the operating mode of the liquid crystal display panel and dynamically adjusting the luminance of sub-pixels accordingly. The control circuit receives signals about the panel's state and modifies the output to maintain consistent chromaticity, creating a closed-loop system that compensates for electro-optical effects.
Solution Approach 2:
The patent changes parameters by adjusting the luminance values of red, green, and blue sub-pixels independently based on the potential difference applied to the liquid crystal display panel. This parameter adjustment ensures that chromaticity remains consistent across different operating modes despite changes in the electro-optical state.
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 reduces the hue difference in the displayed image when changing viewing angles, providing a consistent visual experience for users.
Implementation Method 1
a liquid crystal layer including a twisted nematic liquid crystal element (liquid crystal molecules) and controls the viewing angle of a display surface
Implementation Method 2
an electro-optical device overlapping the liquid crystal display panel in plan view... a first substrate including a first electrode, a second substrate including a second electrode facing the first electrode, and a liquid crystal layer positioned between the first electrode and the second electrode
Data Source
AI summary
According to an aspect, a display device includes: a liquid crystal display panel including a display region in which pixels are arranged, an electro-optical device, and a control circuit. The electro-optical device includes a first substrate including a first electrode, a second substrate including a second electrode, and a liquid crystal layer. The control circuit is configured to operate the electro-optical device in one of a first mode in which a potential difference between the first and second electrodes is set to be zero and a second mode in which the potential difference between the first and second electrodes is set to be larger than zero. In a case where the liquid crystal display panel displays achromatic white in the pixels, chromaticity of the pixels when the electro-optical device operates in the first mode is equal to that when the electro-optical device operates in the second mode.