Pixel Circuit Pressure Sensing Integration
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Solution Overview
Problem
Existing touch display technologies face challenges in integrating pressure sensing functionality accurately within liquid crystal display devices due to installation tolerances, which affect the precision of pressure sensing mechanisms.
Innovation Solution
A pixel circuit is designed to integrate pressure sensing by incorporating a detection electrode, reference module, amplification module, reset module, and switch module, allowing for time multiplexing of scan signals to alternate between display and pressure sensing modes, enabling accurate pressure detection within the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure sensing mechanism is installed in a backlight portion or middle frame portion of a display device, then touch control function is implemented, but installation tolerance reduces measurement precision
Solution Approach 1:
The patent merges the pressure sensing mechanism with the pixel circuit by integrating the detection electrode into the pixel circuit structure. The detection electrode is formed in the same manufacturing process as the transistor electrodes, eliminating the need for separate installation of pressure sensing components. This integration resolves the technical contradiction by achieving both touch control functionality and high measurement precision through structural unification.
2Adaptability or versatility
If a separate pressure sensing mechanism is installed in the display device, then touch control is achieved, but device complexity increases
Solution Approach 1:
The pixel circuit is designed to perform multiple functions: it serves both as the display driving circuit and as the pressure sensing unit. The detection electrode, reference electrode, and amplification module are shared between the pixel circuit and pressure sensing functions. This multi-functionality approach resolves the contradiction by achieving pressure sensing capability without adding separate dedicated components, thereby maintaining device simplicity.
3Adaptability or versatility
If pressure sensing mechanism is installed separately, then touch control function is added, but manufacturing cost increases due to additional installation steps
Solution Approach 1:
The pressure sensing components (detection electrode, reference electrode, amplification module) are prepared and integrated into the pixel circuit during the same manufacturing process. The detection electrode is formed simultaneously with the transistor source and drain electrodes, and the amplification module is constructed using the same thin-film transistor fabrication steps. This preliminary integration resolves the contradiction by eliminating post-manufacturing installation steps, thereby reducing manufacturing costs while achieving pressure sensing functionality.
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 enhances the accuracy of pressure sensing by integrating the functionality within the display device, reducing installation errors and maintaining production cost efficiency by using the same type of transistors for both display and pressure sensing functions.
Implementation Method 1
The detection electrode is configured to detect a pressing by a touch object to generate a detection capacitance with the touch object
Implementation Method 2
The amplification module is coupled with the reference module and the detection electrode, and is configured to output an amplified current signal according to an input voltage signal
Data Source
AI summary
A pixel circuit, a driving method thereof, a substrate including the pixel circuit, a display panel, and an electronic device are disclosed. The pixel circuit includes a pixel unit and a pressure sensing unit. The pixel unit is connected to a scan line and a data line, and is configured to write in an image signal provided through the data line according to a signal provided through the scan line. The pressure sensing unit is connected to the scan line, and includes a detection electrode, a reference module, an amplification module, a reset module, a switch module, and a signal reading line.