Liquid Crystal Display Test Pixel Chromaticity Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining desired chromaticity and contrast due to changes in color filter or liquid crystal characteristics, and irregularities in backlights or temperature conditions, leading to complex structures to address these issues.
Innovation Solution
Incorporating test pixels with the same constitution as regular pixels on the liquid crystal display panel, along with light detectors and a controller to adjust backlight intensities, ensuring stable chromaticity and contrast by compensating for changes in optical transmissivity and chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If means are provided to adjust contrast and compensate for chromaticity irregularities in liquid crystal display devices, then chromaticity stability and contrast are improved, but device structure becomes complicated
Solution Approach 1:
The patent extracts the chromaticity detection and adjustment function from the main display area by providing a dedicated test pixel region separate from the liquid crystal display part. This allows chromaticity measurement and backlight adjustment to be performed independently without interfering with the display function, thereby improving chromaticity stability while avoiding unnecessary complexity in the display structure.
Solution Approach 2:
The patent creates a copy of the pixel structure in the form of test pixels that have the same constitution as regular display pixels but are located in a separate test pixel region. These test pixels replicate the optical characteristics of display pixels, enabling accurate chromaticity measurement without requiring complex measurement systems, thus improving reliability while maintaining structural simplicity.
2Measurement precision
If test pixels and light detectors are added to detect and adjust backlight characteristics, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the test pixel function with the existing pixel structure, using the same liquid crystal layer and color filter structure. The light detector is integrated with the test pixel region, allowing chromaticity measurement to be performed using the same optical path as the display, thereby improving measurement precision without significantly increasing device complexity.
Solution Approach 2:
The test pixels in the patent serve dual purposes: they function as regular display pixels when needed and simultaneously serve as chromaticity measurement elements. The liquid crystal display panel itself provides the measurement function through its test pixels, eliminating the need for separate complex measurement systems and achieving self-service capability.
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 allows for simple and effective adjustment of chromaticity and contrast, maintaining stability despite changes in liquid crystal or backlight conditions, thereby avoiding the need for complex structures.
Implementation Method 1
each pixel includes a pair of electrodes and the optical transmissivity of liquid crystal is controlled for each pixel in response to an electric field generated between these electrodes
Implementation Method 2
a light detector which detects light from the backlight through the test pixel for detection
Data Source
AI summary
In a liquid crystal display device including a liquid crystal display panel and a backlight, the present invention provides a detection-use pixel having the same constitution as respective pixels constituting a liquid crystal display part in the liquid crystal display panel and being formed on a region other than the liquid crystal display part, a light detector detecting light from the backlight through the detection-use pixel, and a controller adjusting the intensity of the light from the backlight in response to a signal from the light detector to adjust the change of the characteristics and chromaticity in the liquid crystal display panel properly.