Touch Detection via Depth Sensing and Calibration Mapping
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Solution Overview
Problem
Current electronic devices require a touch panel of the same size as the display screen, leading to increased costs due to the need for redevelopment of touch panels for different sizes.
Innovation Solution
A touch implementation method and device that uses calibration points displayed on the screen, acquiring both pixel coordinates and three-dimensional coordinates using a depth device, to calculate a mapping parameter for determining the touch point, allowing touch functionality without a dedicated touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated touch panel of the same size as the display screen is used, then touch functionality is achieved, but device cost increases
Solution Approach 1:
The patent extracts the touch detection function from the dedicated touch panel and implements it separately using a depth sensing device. The depth device detects touch coordinates by capturing depth information of the user's finger, separating the touch detection mechanism from the display and touch panel assembly, thereby reducing overall device cost while maintaining touch functionality.
Solution Approach 2:
The patent introduces a depth sensing device as an intermediary component to detect touch coordinates. Instead of relying on the touch panel itself for coordinate detection, the depth device serves as a mediator that captures three-dimensional depth information and converts it into two-dimensional touch coordinates through coordinate transformation, enabling touch functionality without requiring a dedicated touch panel of the same size as the display.
2Measurement precision
If a dedicated touch panel is used for each display screen size, then accurate touch detection is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent makes the depth sensing device universal by enabling it to work with display screens of various sizes. The depth device captures depth information and the system performs coordinate transformation to adapt the three-dimensional depth coordinates to the specific display screen dimensions. This universal approach allows the same depth device to support multiple display sizes, eliminating the need for dedicated touch panels for each screen size and reducing manufacturing complexity.
Solution Approach 2:
The patent changes the coordinate system parameters through transformation. The depth device operates in a three-dimensional coordinate system, while the display screen uses a two-dimensional coordinate system. By performing coordinate transformation that adjusts parameters based on the display screen size and orientation, the system accurately maps touch points across different screen configurations without requiring hardware changes for each size.
3Measurement precision
If calibration points are used for coordinate mapping, then touch accuracy is improved, but user operation time increases
Solution Approach 1:
The patent performs coordinate mapping calibration in advance during the device setup phase. The system displays multiple calibration points on the screen, detects their depth coordinates using the depth device, and pre-calculates the transformation parameters between three-dimensional depth coordinates and two-dimensional display coordinates. This preliminary calibration establishes a mapping relationship that is stored and used for subsequent touch operations, improving accuracy without requiring calibration during normal use.
Data Source
AI summary
A touch implementation method and device and an electronic device are provided, and the method includes: displaying N calibration points for user touch by a display screen of an electronic device; acquiring first coordinates of the N calibration points for user touch; acquiring second coordinates of the N calibration points; and calculating a mapping parameter between a first coordinate of a point and a second coordinate of the point according to the first coordinates of the N calibration points and the second coordinates of the N calibration points. The mapping parameter is configured for acquiring a first coordinate of a touch point touched by the user upon a user touching the display screen. Embodiments of present disclosure can reduce the cost of the electronic.