Display Device Hue Accuracy via Local Quality Aperture Ratios
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Solution Overview
Problem
In liquid crystal display devices, the varying reflectances of metal electrodes across different wavelength ranges for red, green, and blue pixels lead to unequal amounts of light being reflected, resulting in images being displayed with hues different from the actual hues due to non-uniform aperture ratios.
Innovation Solution
A display device configuration with a reflection unit and strategically positioned reflection areas on the active matrix substrate, where the reflection areas are adjusted to ensure uniform light output from red, green, and blue pixel areas by varying the widths of source lines and gate lines, and incorporating driving circuit units to control light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes (gate lines and source lines) are used in the display panel, then electrical connectivity and device functionality are achieved, but the reflectances of these metal electrodes vary across different wavelength ranges (R, G, B), causing non-uniform light reflection and hue distortion in the displayed image
Solution Approach 1:
The patent applies local quality by creating pixel areas with different aperture ratios tailored to specific color requirements. Red pixel areas have a first aperture ratio, green pixel areas have a second aperture ratio, and blue pixel areas have a third aperture ratio. This local differentiation compensates for the varying reflectances of metal electrodes across different wavelengths, ensuring uniform light output and accurate hue representation for each color region.
2Ease of manufacture
If uniform aperture ratios are used for all pixel areas (R, G, B), then manufacturing simplicity is maintained, but the varying reflectances of metal electrodes cause non-uniform light output and hue distortion
Solution Approach 1:
The patent implements local quality by assigning different aperture ratios to different color pixel areas. Red pixel areas are designed with a first aperture ratio, green pixel areas with a second aperture ratio, and blue pixel areas with a third aperture ratio. This localized differentiation compensates for the wavelength-dependent reflectance characteristics of metal electrodes, achieving uniform light output across all colors while maintaining manufacturing feasibility through a systematic design approach.
3Manufacturing precision
If the aperture ratios of pixel areas are adjusted to compensate for varying metal electrode reflectances, then hue accuracy is improved, but the device complexity increases due to different design parameters for each pixel area
Solution Approach 1:
The patent manages device complexity through systematic local quality differentiation. By defining specific aperture ratios for each color pixel area (first ratio for red, second for green, third for blue), the patent achieves hue accuracy while maintaining design organization. The complexity is controlled through a methodical approach where each pixel area's aperture ratio is deliberately designed based on the reflectance characteristics of metal electrodes at corresponding wavelengths, rather than through ad-hoc adjustments.
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
This configuration ensures that the amounts of light outgoing from each pixel area are approximately uniform, thereby maintaining the actual hue of the image displayed, reducing hue variations and enhancing display accuracy.
Implementation Method 1
a reflection unit that allows light emitted from a light source to pass therethrough so as to be projected to the active matrix substrate, and reflects light from the active matrix substrate toward the active matrix substrate
Implementation Method 2
the counter substrate including color filters of R (red), G (green), and B (blue) at positions corresponding to the pixel areas, respectively
Data Source
AI summary
Provided is a technique for controlling the hue of an image when the image is displayed on a display panel so that the image should not be displayed with a hue different from the actual hue. The display device includes a display panel that includes an active matrix substrate 11a and a counter substrate 11b, and a reflection unit 12. The active matrix substrate 11a includes gate lines and source lines 24, and includes a plurality of pixel areas that are defined by the gate lines and the source lines 24. The counter substrate 11b includes color filters 31R, 31G, 31B of R, G, B at positions corresponding to the pixel areas. The reflection unit 12 transmits light from the light source 14, and reflects light from the active matrix substrate 11a. The pixel areas of R, G, B have reflection areas that reflect light from the reflection unit 12 so that the respective amounts of light outgoing from the above-described pixel areas are approximately uniform.