Touch Display Input Circuit With Low-Voltage Readout Conversion
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting user inputs and have high production costs for readout circuits used in input detection.
Innovation Solution
A display device with an input sensor comprising a transmission electrode and a reception electrode, a readout circuit, and an output circuit, utilizing low-voltage transmission signals and high-voltage transmission signals, along with a voltage generator and scan driving circuit, to enhance input detection precision and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-voltage transmission signals are used to improve input detection precision, then measurement precision improves, but device complexity and production cost increase
Solution Approach 1:
The system is divided into two functional segments: a readout circuit that operates at low voltage (3.3V) for cost-effective signal reading, and a separate output circuit that converts signals to high voltage (12V) for improved touch detection precision. This segmentation allows each circuit to be optimized independently, resolving the contradiction between precision and complexity.
Solution Approach 2:
An output circuit acts as an intermediary between the low-voltage readout circuit and the high-voltage transmission electrode. This intermediary converts low-voltage signals to high-voltage signals, enabling the system to achieve high detection precision without requiring the entire readout circuit to operate at high voltage, thus reducing overall device complexity.
2Measurement precision
If high-voltage transmission signals are used to improve input detection precision, then measurement precision improves, but production cost increases
Solution Approach 1:
The system separates the high-voltage generation function from the readout circuit, placing it in a dedicated output circuit. This allows the majority of the system (readout circuit) to use cost-effective low-voltage components, while only a small portion requires high-voltage capability, thereby reducing overall production cost while maintaining detection precision.
Solution Approach 2:
The readout circuit uses inexpensive low-voltage components (3.3V operation) that are easier and cheaper to manufacture. The high-voltage output circuit is a simple signal conversion stage that does not require complex high-voltage handling throughout the entire system, reducing overall manufacturing cost while achieving the needed detection precision.
3Ease of manufacture
If low-voltage readout circuit is used to reduce production cost, then ease of manufacture improves, but input detection precision deteriorates
Solution Approach 1:
The output circuit serves as an intermediary that takes the low-voltage signal from the cost-effective readout circuit and converts it to a high-voltage signal suitable for driving the transmission electrode. This intermediary enables the system to use inexpensive low-voltage components for signal reading while still achieving high detection precision through high-voltage signal transmission.
Solution Approach 2:
The system changes the voltage parameter dynamically: low voltage (3.3V) is used in the readout circuit for cost-effective operation, while high voltage (12V) is generated in the output circuit for precise touch detection. This parameter change allows the system to optimize both cost and precision in different functional stages.
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 provides precise user input detection and lowers the production cost of readout circuits, improving the overall efficiency and affordability of display devices.
Implementation Method 1
an output circuit configured to convert the low-voltage transmission signal into a transmission signal and to provide the transmission signal to the transmission electrode. The low-voltage transmission signal has a voltage level between a first high voltage and a first low voltage, and the transmission signal has a voltage level between a second high voltage and a second low voltage, and the second high voltage is higher than the first high voltage.
Implementation Method 2
a readout circuit configured to output a low-voltage transmission signal and to receive a reception signal from the reception electrode
Implementation Method 3
an analog-to-digital converter configured to convert the reception sensing signal into a digital signal and to output a digital sensing signal
Data Source
AI summary
A display device including: a display panel; an input sensor disposed on the display panel and including a transmission electrode and a reception electrode; a readout circuit configured to output a low-voltage transmission signal and to receive a reception signal from the reception electrode; and an output circuit configured to convert the low-voltage transmission signal into a transmission signal and to provide the transmission signal to the transmission electrode.