Dual Liquid Crystal Display Illuminance-Adaptive Spatial Filtering
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Solution Overview
Problem
Dual liquid crystal cell display devices face issues with reduced luminance viewing angle and image quality due to environmental illuminance, leading to perceived narrower viewing angles in bright conditions and image quality deterioration in dark conditions.
Innovation Solution
An image processing device that generates image signals for both rear and front liquid crystal cells and controls the spatial filter process based on illuminance detected by a sensor, adjusting the filter characteristics such as filter passage width and peak value to optimize image blur and light transmission, thereby improving image quality across varying illuminance conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a spatial filter is used to blur the rear liquid crystal cell image, then the luminance viewing angle is improved, but image quality deteriorates due to flare (black float) in dark environments and reduced contrast
Solution Approach 1:
The patent applies dynamics by making the spatial filter characteristics variable rather than fixed. The filter passage width and peak value are dynamically adjusted based on detected illuminance levels, allowing the system to optimize between viewing angle and image quality depending on environmental conditions. This is achieved through the filter control unit that receives illuminance detection values and adjusts filter parameters accordingly.
Solution Approach 2:
The patent implements parameter changes by modifying the spatial filter parameters (filter passage width and peak value) based on illuminance conditions. In bright environments, the filter passage width is increased to enhance viewing angle, while in dark environments, the filter characteristics are adjusted to minimize flare and maintain image quality. This parameter adaptation resolves the contradiction between viewing angle and image quality.
2Illumination intensity
If the filter passage width is increased to improve viewing angle in bright environments, then luminance perception is enhanced, but image quality deteriorates due to emphasized flare in dark environments
Solution Approach 1:
The patent uses parameter changes to adapt the filter passage width and peak value according to illuminance levels. In bright environments, larger filter passage width is applied to improve luminance perception and viewing angle. In dark environments, the filter parameters are adjusted to reduce flare effects. This dynamic parameter adjustment eliminates the need to choose between luminance perception and flare reduction.
Solution Approach 2:
The patent implements feedback by using an illuminance detection unit to sense environmental light conditions and feeding this information to the filter control unit. The filter characteristics are then adjusted based on this feedback, creating a closed-loop system that automatically optimizes the balance between luminance perception and flare reduction according to actual viewing conditions.
Data Source
AI summary
In a display device with two liquid crystal cells, image quality deterioration depending on brightness and darkness of an environment is reduced. For this purpose, as an image signal for a liquid crystal display panel in which a display image is generated by light passing through a rear liquid crystal cell and a front liquid crystal cell, an image processing unit generates a rear image signal for the rear liquid crystal cell and a front image signal for the front liquid crystal cell. This image processing unit performs a spatial filter process on the rear image signal. Then, a filter control unit controls the spatial filter process performed on the rear image signal in the image processing unit on the basis of a detection value of an illuminance sensor that detects illuminance around the display panel.