Liquid Crystal Display With Integrated Photo Sensing Substrate
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Solution Overview
Problem
Conventional liquid crystal display devices lack an integrated image sensing function, requiring separate devices for image sensing and display, which increases complexity and size.
Innovation Solution
A liquid crystal display device incorporating a photo sensing device with a thin film transistor (TFT) and storage capacitor, integrated into the TFT array substrate, allowing for ambient light sensing and image detection, enabling both display and image sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate image sensing device is used, then image sensing function is achieved, but device complexity and size increase
Solution Approach 1:
The patent combines the image sensing function with the liquid crystal display device by integrating a photo sensing device into the TFT array substrate. The photo sensing device shares the same substrate and manufacturing process as the display device, merging two separate functions (display and sensing) into a single integrated device, thereby reducing overall device complexity while maintaining both functionalities
Solution Approach 2:
The TFT array substrate is designed to serve dual purposes: as the display device substrate and as the integration platform for the photo sensing device. The photo sensing device, storage capacitor, and switch TFT all share the same substrate infrastructure, creating a multi-functional device that can both display images and sense external images/documents
2Adaptability or versatility
If a separate image sensing device is used, then image sensing function is achieved, but device size increases
Solution Approach 1:
The patent merges the image sensing function with the display device by integrating the photo sensing device onto the same TFT array substrate. This integration eliminates the need for a separate physical sensing device, thereby reducing the overall device size while maintaining image sensing capability
Solution Approach 2:
The photo sensing device components (photo TFT, storage capacitor, switch TFT) are nested within the existing TFT array substrate structure. The sensing function is embedded within the display device's substrate, creating a compact integrated design where one device is effectively nested within another, reducing total device footprint
3Ease of manufacture
If photo sensing device is integrated into TFT array substrate, then manufacturing process is simplified, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines the manufacturing processes of the display device and photo sensing device into a single integrated process. Both devices are formed on the same TFT array substrate using the same fabrication steps, which simplifies the overall manufacturing process by eliminating the need for separate device fabrication and assembly, despite requiring precise alignment and integration
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 integration of a photo sensing device within the liquid crystal display device simplifies the manufacturing process, reduces size, and enables the device to sense and display images, such as documents or fingerprints, without the need for additional hardware.
Implementation Method 1
The photo sensing device operates to sense an ambient light
Implementation Method 2
a storage capacitor to store charge generated by light
Data Source
AI summary
A liquid crystal display device includes a gate line and a data line intersecting each other on a substrate. The liquid crystal display device further includes a photo sensing device and a first thin film transistor (“TFT”) located at an intersection area of the gate line. The photo sensing device operates to sense an ambient light and includes a storage capacitor to store charge generated by light. The photo sensing device is drive by a driving voltage other than the data voltage.