Touch-Speed Display Timing Control to Reduce Scroll Image Drag
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Solution Overview
Problem
Display devices experience screen abnormalities, such as image drag, during screen scrolling due to mismatches between previous and current frame images, degrading display quality.
Innovation Solution
A display device with a touch sensing portion to detect input speed, adjusting the scan and data signal periods based on input speed, and incorporating a processor to manage porch periods and refresh rates to maintain consistent frame width and reduce display periods, thereby improving display quality and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the scan signal and data signal periods are reduced during high-speed touch input, then the image switching speed is improved and screen abnormalities are minimized, but the power consumption increases
Solution Approach 1:
The patent dynamically adjusts the scan signal and data signal periods based on the touch input speed. When high-speed scrolling is detected, the signal periods are reduced to enable faster image switching. This dynamic adaptation resolves the contradiction by optimizing performance only when necessary, rather than maintaining high speed continuously which would waste energy during normal operation.
Solution Approach 2:
The patent changes the timing parameters (signal periods) of the display system in response to detected touch input speed. By modifying these parameters dynamically, the system achieves fast image switching during high-speed scrolling while avoiding unnecessary power consumption during normal operation, thus resolving the speed-power consumption trade-off.
2Manufacturing precision
If the scan signal and data signal periods are reduced to prevent image drag, then the display quality during scrolling is improved, but the frame refresh rate consistency deteriorates
Solution Approach 1:
The system dynamically adjusts signal timing only during high-speed touch input events, while maintaining standard timing during normal operation. This conditional dynamic adjustment preserves frame refresh rate consistency for the majority of operation while enabling quality improvement during scrolling events, resolving the contradiction between display quality and refresh rate consistency.
Solution Approach 2:
The patent applies different timing parameters locally - using reduced signal periods specifically during high-speed scrolling events while maintaining normal periods during other operations. This localized quality adjustment ensures high display quality during scrolling without compromising overall frame refresh rate consistency, as the adjustment is applied only where and when needed.
3Reliability
If the image switching speed is increased during high-speed touch input, then the screen abnormality is reduced, but the power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of image switching speed based on real-time detection of touch input speed. During high-speed scrolling events that cause screen abnormalities, the system increases switching speed to prevent display artifacts. During normal operation, standard switching speed is maintained to conserve power, thus resolving the reliability-power consumption contradiction.
Solution Approach 2:
The system changes the image switching parameters dynamically in response to touch input conditions. By modifying switching speed only when screen abnormalities are likely to occur (during high-speed scrolling), the patent achieves reliable display quality without the continuous power consumption that would result from maintaining high switching speed at all times.
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 effectively reduces screen abnormalities and enhances display quality by quickly updating data signals during reduced display periods, while maintaining consistent refresh rates and minimizing power consumption.
Implementation Method 1
a touch driver which senses a touch input based on a change of a capacitance between the sensing electrodes
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A display device includes a display portion, a display driver, a touch sensing portion, and a touch driver. The display portion includes data lines, scan lines, and pixels connected to the data lines and the scan lines. The display driver provides data signals to the data lines and sequentially provides scan signals to the scan lines. The touch sensing portion includes sensing electrodes. The touch driver senses a touch input based on a change of a capacitance between the sensing electrodes and calculates a movement speed of the touch input. When the movement speed of the touch input is greater than a reference speed, a first period in which the scan signals and the data signals are provided is reduced in a frame period in which a frame image is displayed.