Sensor-Equipped Display Synchronizing Drive Timing With Image Refresh
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electronic apparatuses with integrated input and display panels face challenges in accurately detecting contact or proximity positions on the display screen, particularly in terms of noise removal and synchronization of image display timing with sensor drive timing, leading to potential delays and operation errors.
Innovation Solution
The electronic apparatus comprises a sensor-equipped display device with a detecting circuit that generates raw data including three-dimensional coordinates and physical quantities, an application processor that processes this data to control sensor drive timing, and a display driver that synchronizes image display and sensor operations, using an integrating circuit, A/D converter, filter, and timing controller to enhance detection accuracy and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor operates continuously to detect contact or proximity positions, then detection responsiveness is improved, but power consumption increases and noise interference worsens
Solution Approach 1:
The sensor is driven periodically rather than continuously. The drive circuit activates the sensor at specific intervals synchronized with display refresh cycles, reducing power consumption while maintaining detection responsiveness. The periodic driving allows the sensor to remain inactive during non-detection periods, eliminating unnecessary power usage.
Solution Approach 2:
The system performs preliminary detection in a first detection region before expanding to a second detection region. This staged approach allows the sensor to operate at lower power initially, activating full-sensor operation only when needed based on initial detection results, thereby reducing overall power consumption while maintaining responsiveness.
2Ease of operation
If the sensor drive timing is not synchronized with image display timing, then operational simplicity is maintained, but detection accuracy deteriorates and operation errors occur
Solution Approach 1:
The system uses feedback from the display driver to synchronize sensor drive timing with image display timing. The synchronization signal from the display driver triggers the sensor drive circuit, ensuring that detection operations are coordinated with display refresh cycles. This feedback mechanism maintains detection accuracy without significantly complicating the operational structure.
Solution Approach 2:
The display driver is designed to serve multiple functions: driving the display panel and generating synchronization signals for the sensor drive circuit. This multi-functionality allows the system to maintain synchronization between display and sensor operations without adding separate control circuits, thereby preserving operational simplicity while improving detection accuracy.
3Measurement precision
If noise removal processing is applied to sensor data, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The system extracts and processes only the necessary sensor data components rather than applying comprehensive noise removal to all data. By selectively processing only the relevant detection signals and ignoring redundant data, the system maintains high detection accuracy while minimizing processing time and avoiding unnecessary computational overhead.
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 configuration improves detection accuracy, reduces noise, and enables smooth feedback of sensor inputs to the display, suppressing delays and operation errors, thus enhancing user convenience and the overall performance of the electronic apparatus.
Implementation Method 1
The input panel comprises, for example, a sensor configured to detect variation in capacitance
Data Source
AI summary
According to one embodiment, an electronic apparatus, includes a sensor-equipped display device includes a display device and a sensor configured to detect a contact or proximate position, a display driver configured to output an image display signal to the display device and to output a drive signal to the sensor, a detecting circuit configured to generate, based on the information from the sensor, raw data (Raw data) including three-dimensional information of coordinates of a position on the display device and a physical quantity at the coordinates, and an application processor configured to discriminate whether a part of the region in the display area should be further sensed or not, based on the raw data, and if the part of the region is further sensed, to output the range of the display device to be further sensed and the timing of driving the sensor to the display driver.