Touch Panel Display Non-Integer Frame Scanning
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Solution Overview
Problem
Conventional in-cell touch panel display devices typically scan sensing electrodes at a fixed frequency, limiting touch detection accuracy as they cannot execute touch detection a number of times other than an integer in one frame period, which may not be suitable for all touch operations.
Innovation Solution
A touch panel display device with an active matrix substrate and a control unit that alternately switches between gate scan periods and sensor scan periods, allowing for touch detection to be executed a number of times other than an integer in one frame period by scanning segments multiple times, and optionally selecting from different scan patterns based on the type of touch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch detection is executed an integer number of times in one frame period at fixed scan speed, then scanning synchronization is maintained, but touch detection accuracy is limited for certain touch operations
Solution Approach 1:
The patent implements dynamic scanning by allowing the touch panel to execute touch detection a non-integer number of times per frame period (e.g., 1.5 times). This is achieved by dividing the frame period into multiple gate scan periods and sensor scan periods, where sensor scan periods can be configured to complete partial or multiple touch detection cycles. This dynamic approach enables the system to adapt scanning speed to different touch operation types, thereby improving touch detection accuracy without being constrained by fixed integer-based scanning synchronization.
2Measurement precision
If scanning speed is increased to improve touch detection accuracy, then position detection precision improves, but the frame period timing becomes inconsistent with indicated frequency
Solution Approach 1:
The patent segments the frame period into multiple gate scan periods and sensor scan periods. By dividing the overall scanning task into smaller segments, the system can flexibly configure the number and duration of sensor scan periods within the frame period. This segmentation allows the touch detection to be executed a non-integer number of times while maintaining overall frame period synchronization, thus improving position detection precision without compromising frame timing stability.
3Measurement precision
If non-integer scans are permitted to improve touch detection accuracy, then position detection precision improves, but control complexity increases
Solution Approach 1:
The patent employs periodic scanning actions by configuring multiple sensor scan periods within one frame period. Each sensor scan period executes touch detection in a regular, periodic manner, and by setting the number of sensor scan periods to a non-integer multiple of gate scan periods, the system achieves non-integer scanning. This periodic structure simplifies control compared to arbitrary timing, as it maintains regular intervals while enabling flexible scan counts, thus improving position detection precision without excessive control complexity.
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
Enhances touch detection accuracy by enabling scanning at varying speeds, improving position detection precision by allowing non-integer scans and providing options for scan patterns tailored to specific touch operations.
Implementation Method 1
a plurality of counter electrodes disposed to form a matrix and configured to form electrostatic capacitance between the plurality of pixel electrodes and the counter electrodes
Data Source
AI summary
A touch panel display device includes an active matrix substrate and a control unit. The active matrix substrate is provided with gate lines, pixel electrodes connected to the gate lines, counter electrodes disposed to form a matrix, and touch sensor wires connected to the counter electrodes. The control unit alternately switches, during one frame period, between a gate scan period of scanning the gate lines and a sensor scan period of scanning the counter electrodes by a segment SEG and detecting electrostatic capacitance by. The one frame period includes a plurality of gate scan periods and a plurality of sensor scan periods. The control unit scans each of the segments in a first scan mode of completing touch detection of scanning all the segments in the one frame period a number of times other than an integer.