Display Touch Driver Uplink Signal Timing
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Solution Overview
Problem
The increasing thickness of panels in electronic devices leads to parasitic capacitance between panel electrodes and touch electrodes, hindering signal transmission and reception, and increasing driving voltage to solve this issue results in higher power consumption.
Innovation Solution
A display device system and method that improves signal reliability between a display device and an active pen by transmitting uplink signals during the blank period of the frame period when the display panel is not displaying an image, using a touch driver to sense touches and encode data for transmission through touch electrodes, and receiving downlink signals in a subsequent time period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the panel thickness is reduced, then the parasitic capacitance between panel electrode and touch electrode increases, but reducing panel thickness is not always feasible for structural reasons
Solution Approach 1:
The patent applies preliminary action by transmitting the uplink signal during the blank period before the display period begins. This timing arrangement allows the signal to be sent before the panel electrode becomes active and creates parasitic capacitance with the touch electrode, thereby preventing signal interference while maintaining thin panel design
Solution Approach 2:
The patent employs dynamics by dynamically adjusting the timing of uplink signal transmission based on the display frame structure. The signal is transmitted during the blank period when the display driver is not actively driving the display panel, creating a dynamic time-division multiplexing scheme that avoids parasitic capacitance interference without requiring physical separation
2Reliability
If the driving voltage of uplink signal is increased, then the signal transmission reliability improves, but the power consumption increases
Solution Approach 1:
The patent uses preliminary action by transmitting the uplink signal during the blank period before the display period. This timing allows signal transmission at normal voltage levels without the need for voltage boosting, thereby maintaining signal reliability while avoiding increased power consumption that would result from higher driving voltages
Solution Approach 2:
The patent applies periodic action by utilizing the periodic blank periods in the display frame structure for uplink signal transmission. This periodic time-division approach allows reliable signal communication at standard voltage levels by exploiting the natural periodic inactive periods of the display driver, avoiding continuous high-voltage operation and its associated power consumption
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a display driver configured to display an image on the display panel in a frame period unit, to display the image on the display panel in a display period of the frame period, and to not display the image in a blank period of the frame period, a touch panel including touch electrodes, and a touch driver configured to sense a touch adjacent to the touch panel via the touch electrodes, and to transmit an uplink signal to an external device through the touch electrodes in a first time period, the first time period being in the blank period.