Pixel Drive Circuit Light Touch Module for Transflective Displays
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Solution Overview
Problem
Transflective liquid crystal display apparatuses face challenges in integrating touch functionality while maintaining low energy consumption and efficient use of both internal and external light sources, which is essential for diverse environmental conditions.
Innovation Solution
A pixel driving circuit with a light touch module comprising a photosensitive unit, signal reading unit, amplifier, and processor is introduced, allowing for the detection of light intensity changes and determination of touch positions, enabling both display and touch functions simultaneously without interfering with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch function is integrated into a transflective display apparatus, then the human-machine interaction convenience is improved, but the device complexity increases
Solution Approach 1:
The display apparatus integrates multiple functions into a single device by combining the display function with the touch sensing function. The same display structure serves dual purposes: displaying visual information and detecting touch inputs through light intensity changes, eliminating the need for separate touch sensing components
Solution Approach 2:
The touch sensing circuit is merged with the display circuit by using the photosensitive unit integrated within the display pixel structure. The signal reading unit shares the same circuit architecture as the display driving circuit, combining what could be separate functions into a unified system
2Measurement precision
If a light touch module is added to each pixel, then the touch sensitivity is improved, but the energy consumption increases
Solution Approach 1:
The touch detection is performed periodically rather than continuously, with the signal reading unit activated at specific intervals to read the electrical signal from the photosensitive unit. This periodic sampling approach maintains high touch sensitivity while significantly reducing overall energy consumption compared to continuous monitoring
Solution Approach 2:
The display apparatus uses its own display backlight as the light source for touch detection, eliminating the need for separate illumination sources. The photosensitive unit detects light intensity changes from the display's own backlight, allowing the system to serve its touch sensing function using resources already available for display operation
3Measurement precision
If the photosensitive unit detects light intensity changes, then the touch position detection accuracy is improved, but the interference between display and touch functions increases
Solution Approach 1:
The electrical signal representing light intensity information is read and stored in advance in a holding circuit before display refresh operations occur. By capturing the touch information beforehand and separating the reading timing from the display updating timing, the patent prevents interference between the touch detection function and the display function while maintaining accurate touch position detection
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 enables high sensitivity touch functionality and efficient energy use, allowing the display apparatus to function effectively in various lighting conditions and support both direct and remote touch interactions, making it suitable for large-sized displays.
Implementation Method 1
a photosensitive unit for sensing the light intensity and producing an electrical signal carrying the light intensity information
Data Source
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AI summary
There is disclosed a pixel driving circuit and its driving method, an array substrate, a transflective display apparatus. At least one of the pixels of the pixel driving circuit includes a light touch module (10) which comprises: a photosensitive unit (101) which senses the light intensity and produces an electrical signal carrying the light intensity information; a signal reading unit (102) connected with the photosensitive unit and reading the electrical signal fromthere; an amplifier (103) connected with the signal reading unit (102) and amplifying the electrical signal acquired therefrom; and a processor (104) connected with the amplifier (103), having a threshold of the change of the electrical signal and the electrical signal amplified at a previous time stored therein, and taking the acquired position information of the pixel where the light touch module (10) is located as the touch position when the change amount of the electrical signal amplified at a current time relative to the electrical signal amplified at the previous time acquired from the amplifier (103) is greater than the threshold. The driving circuit and the driving method provided in the present disclosure cause the array substrate and the transflective display apparatus applying the both to realize the light touch function on the basis of realizing the display function.