Integrated Pixel Circuit for OLED Touch Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-cell touch panel OLED display panels require separate circuits for display drive and touch functions, leading to higher production costs, thicker screens, and increased complexity.
Innovation Solution
A pixel circuit integrating a luminous device, photosensitive device, drive control sub-module, data write sub-module, light-emitting control sub-module, and touch detection sub-module, where the data write sub-module transmits data signals to the drive control sub-module, the light-emitting control sub-module drives the luminous device for display, and the touch detection sub-module processes touch signals, reducing the need for separate circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are used for display drive and touch functions, then the reliability and functionality are improved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the display drive circuit and touch detection circuit into a single integrated pixel circuit. The touch detection sub-module and display drive sub-module share common components including the photosensitive device, drive control transistor, and signal transmission pathways. This merging eliminates the need for completely separate circuits while maintaining both display and touch functionality.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions through a unified structure. The same pixel circuit structure handles both display driving (through the display drive sub-module) and touch detection (through the touch detection sub-module). The drive control transistor and photosensitive device serve dual purposes in both display and touch operations.
2Reliability
If separate circuits are used for display drive and touch functions, then the functionality is improved, but the production cost increases
Solution Approach 1:
By merging the display drive circuit and touch detection circuit into one integrated structure, the patent reduces the total number of components that need to be manufactured and assembled. The shared components (drive control transistor, photosensitive device, signal lines) are manufactured in the same process batch, simplifying production and reducing costs compared to manufacturing separate circuits.
3Reliability
If separate circuits are used for display drive and touch functions, then the functionality is improved, but the display screen thickness increases
Solution Approach 1:
The integration of both display and touch circuits within the same pixel circuit structure eliminates the need for separate circuit layers or additional space for discrete components. The shared signal pathways and common transistor structures reduce the overall vertical stacking requirements, enabling thinner display screens while maintaining full functionality.
4Reliability
If separate circuits are used for display drive and touch functions, then the functionality is improved, but the energy consumption increases
Solution Approach 1:
The unified pixel circuit structure allows for shared use of power supply lines, reference voltage sources, and control signal pathways between display and touch functions. The drive control transistor and other active components can be dynamically controlled to serve either display or touch operations at different times, reducing overall power consumption compared to having continuously active separate circuits.
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 integration reduces production costs and thickness by combining touch and display functions within the pixel circuit, enabling thinner and more cost-effective OLED display panels.
Implementation Method 1
a touch detection signal, which is decreased as the light intensity irradiated onto the photosensitive device is increased
Data Source
AI summary
A pixel circuit, an organic electroluminescent display panel and a display device are provided. The pixel circuit includes a luminous device (D1), a photosensitive device (P1), a drive control sub-module (1), a data write sub-module (2), a light-emitting control sub-module (3) and a touch detection sub-module (4). Upon the data write sub-module (2) being turned on, a data signal at the data signal terminal (Data) is transmitted to the drive control sub-module (1) by the data write sub-module (2). Upon the light-emitting control sub-module (3) being turned on, the light-emitting control sub-module (3) controls the drive control sub-module (1) to drive the luminous device (D1) to give off light, so as to achieve a display function. Upon the touch detection sub-module (4) being turned on, the touch detection sub-module (4) controls output of a touch detection signal from the drive control sub-module (1) to a touch signal read terminal. The touch detection signal is decreased as the light intensity irradiated onto the photosensitive device is increased, so as to achieve a touch detecting function. Touch and display functions are integrated in the pixel circuit, so that the production cost involved in arranging a display drive circuit and a touch circuit separately can be saved, and thickness of the display panel can be thinned as well.