Liquid Crystal Display Transparent Area Transmittance Control
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Solution Overview
Problem
In field-sequential liquid crystal display devices, the background is not clearly viewable due to limited transmittance in subfields other than the W field, resulting in a short viewing time for the background.
Innovation Solution
An image display device that divides the frame period into subfields, extracts a transparent display area, and uses transparency setting data to forcibly display this area in all subfields, allowing light of different colors to be emitted, ensuring the background is visible through the transparent display area in each subfield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the liquid crystal panel transmits light in the W field to enable background viewing, then the background viewing time is extended, but the color display accuracy is degraded in non-W subfields
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different display areas. The transparent display area maintains high transmittance across all subfields (R, G, B, W) to enable background viewing, while the non-transparent area undergoes normal field-sequential color control. This spatial differentiation allows the same liquid crystal panel to simultaneously achieve extended background viewing time in transparent regions and accurate color display in non-transparent regions, resolving the contradiction between these two requirements.
2Illumination intensity
If the liquid crystal panel maintains high transmittance in all subfields for transparent display area, then background visibility is improved, but the light usage efficiency for color display is reduced
Solution Approach 1:
The patent implements local quality by applying different transmittance control strategies to different spatial regions. The transparent display area maintains high transmittance in all subfields to maximize background visibility, while the non-transparent area uses selective transmittance control optimized for color display efficiency. This localized approach ensures that light usage efficiency is preserved in regions where color display is prioritized, while background visibility is maximized in transparent regions.
Solution Approach 2:
The patent segments the display area into transparent and non-transparent regions, each with independent transmittance control characteristics. This segmentation allows the system to optimize for different objectives in different regions: background visibility in transparent areas and color display efficiency in non-transparent areas, thereby resolving the contradiction between these competing requirements without compromising overall system performance.
3Manufacturing precision
If the frame period is divided into four subfields (W, R, G, B) to reduce color breakup, then color display quality is improved, but the transparent display time is limited to only the W field
Solution Approach 1:
The patent applies local quality by enabling transparent display functionality in all four subfields (W, R, G, B) specifically for the transparent display area, while maintaining the four-subfield structure for color display in non-transparent areas. This localized modification allows the system to simultaneously achieve high color display quality through field-sequential coloring in non-transparent regions and extended transparent display time across all subfields in transparent regions, effectively resolving the contradiction between these two parameters.
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 solution enables the background to be clearly and easily viewed by maintaining high transmittance in all subfields, including R, G, and B fields, thereby extending the viewing time and improving the visibility of the background.
Implementation Method 1
a liquid crystal panel to control its transmission state
Implementation Method 2
each of LEDs (Light Emitting Diodes) of red (R), green (G), and blue (B) to be a light source of backlight is sequentially switched
Data Source
AI summary
A liquid crystal display device (100) according to the present invention comprises: a transparent-display-area extraction circuit (15) for extracting an area to be used as a transparent display area from an input image signal (Sin); a subfield generation circuit (21) which divides the input image signal (Sin) into a plurality of subfields to generate a subfield image signal (Ssf) and reads, from a resister (22), transparency setting data (Dts) for forcibly changing the transparent display area to a state of transparent display in all the subfields; and a display panel drive unit (23,30) which displays an image on a crystal liquid panel (60) for each subfield on the basis of the subfield image signal (Ssf) and changes the transparent display area into a state of transparent display on the liquid crystal panel (60) on the basis of the transparency setting data (Dts).