Driving Circuit Pixel Shift Calibration for Touch Input
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Solution Overview
Problem
Organic light emitting display devices face image quality distortion due to large differences in gray scales between adjacent organic light emitting diodes, leading to increased power consumption and delay in processing touch inputs in smart devices.
Innovation Solution
A driving circuit that calibrates pixel shift data to determine touch input positions based on detection signals from a touch sensor, reducing the need for frequent transmissions between the application processor and timing controller, and incorporating a touch position calculating unit to generate pixel shift calibrated touch coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If touch coordinates are transmitted frequently from application processor to timing controller, then touch input responsiveness is improved, but power consumption and transmission delay increase
Solution Approach 1:
The timing controller performs pixel shift calibration on touch coordinates in advance before transmitting to the application processor. This preliminary calibration action eliminates the need for frequent back-and-forth transmissions, reducing power consumption while maintaining responsive touch input performance.
Solution Approach 2:
The timing controller acts as an intermediary that receives uncalibrated touch coordinates from the touch sensor, performs pixel shift calibration, and then transmits calibrated coordinates to the application processor. This intermediary processing eliminates the need for the application processor to repeatedly request and receive uncalibrated coordinates.
2Productivity
If multiple processors are used for touch coordinate processing, then processing capability is improved, but device complexity increases
Solution Approach 1:
The timing controller is designed to perform multiple functions: it generates timing control signals for the display panel driver, processes pixel shift calibration for display images, and now also performs pixel shift calibration for touch coordinates. This multi-functionality eliminates the need for separate dedicated processors, reducing device complexity while maintaining processing capability.
Solution Approach 2:
The patent merges the touch coordinate calibration function into the timing controller, which already handles display timing and pixel shift processing. By combining these functions in a single processor, the system reduces the number of separate processors needed while maintaining comprehensive processing capability.
Data Source
AI summary
In an electronic device, touch coordinates, which are not pixel shift calibrated, are not transmitted from an application processor to a timing controller. Instead, pixel shift data are supplied to a touch position calculating unit disposed in a driving circuit or the application processor, and the touch position calculating unit generates pixel shift calibrated touch coordinates by reflecting the pixel shift data when calculating a touch position based on detection signals from a touch sensor. Accordingly, it is not necessary to transmit touch coordinates, which are not pixel shift calibrated, from the application processor to the timing controller, thereby decreasing a delay and power consumption due to frequency transception.