Semiconductor Display Touch Sensor Driving Period Division
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Solution Overview
Problem
Current display devices, such as LCDs and AMOLEDs, face issues with slow response time, limited flexibility, short lifespan, and low yield, while touch screens experience high failure rates due to display noise interference during touch recognition, leading to reduced luminance and increased touch sensing time.
Innovation Solution
A display device incorporating semiconductor light emitting devices with a touch sensor system that alternates driving modes between the display and touch sensor to minimize touch sensing time and maximize display panel driving period, utilizing a controller to sequentially drive the display and touch sensor, with touch sensing lines turned on or off based on input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display and touch sensor are driven simultaneously, then the touch recognition can be performed continuously, but the display panel noise interferes with the touch sensor causing high failure rate and reduced measurement precision
Solution Approach 1:
The patent divides the driving period into separate display driving periods and touch sensor driving periods, preventing simultaneous operation. This temporal segmentation eliminates the interference between display panel noise and touch sensor signals, resolving the contradiction between continuous touch recognition and measurement precision.
Solution Approach 2:
The patent implements periodic alternation between display driving and touch sensor driving modes. During display driving periods, the display operates normally while the touch sensor remains inactive. During touch sensor driving periods, the display is turned off and the touch sensor performs recognition. This periodic action ensures that touch recognition is performed only when display noise is absent, maintaining measurement precision while preserving reliability through systematic scheduling.
2Productivity
If the touch sensor is driven during the display driving time, then the touch recognition can be performed more frequently, but the display luminance decreases and the display quality deteriorates
Solution Approach 1:
The patent establishes periodic cycles where the display operates during display driving periods and the touch sensor operates during separate touch sensor driving periods. This ensures that touch recognition frequency is optimized within the constraints of maintaining display luminance, as the display operates at full brightness during its dedicated periods without interruption from touch sensor operations.
Solution Approach 2:
The patent dynamically adjusts the driving modes of both the display and touch sensor based on the current operational phase. The controller switches between display-driven mode and touch-sensor-driven mode, optimizing the timing and duration of each phase to balance touch recognition frequency requirements with display luminance maintenance.
3Manufacturing precision
If the resolution of the display panel is increased, then the display quality is improved, but the touch sensing time increases in proportion
Solution Approach 1:
The patent segments the touch sensing operation into distinct phases that occur during dedicated touch sensor driving periods. By separating high-resolution display operations from touch sensing operations into non-overlapping time segments, the system can process touch data for high-resolution displays without the time pressure of simultaneous display refresh, effectively managing the trade-off between resolution and sensing time.
Solution Approach 2:
The patent implements periodic touch sensor driving periods that are synchronized with the display refresh cycle. During these periodic intervals, the touch sensor performs comprehensive sensing operations across the entire high-resolution display area. The periodic nature allows the system to allocate sufficient time for complete touch sensing across all pixels without compromising display quality, as the sensing operation is concentrated into dedicated time windows.
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 approach reduces touch sensing time, increases display panel luminance, and optimizes the division of driving periods between the display and touch sensor, enhancing the overall performance and efficiency of flexible display devices.
Implementation Method 1
light emitting diodes (LEDs) are well known light emitting devices for converting an electrical current to light
Data Source
AI summary
A display device including a display including a plurality of semiconductor light emitting devices; a touch sensor including touch sensing lines disposed to overlap with the plurality of semiconductor light emitting devices, and arranged to cross each other to sense a touch input; and a controller configured to sequentially drive the touch sensor to sense a touch input and the display to control the semiconductor light emitting devices. Further, a driving mode of the touch sensor includes a first driving mode in which part of the touch sensing lines are turned on, and a second driving mode in which at least part of touch sensing lines turned off in the first driving mode are additionally turned on when the touch input is sensed in the first driving mode.