Display Sensor Signal Interference Cancellation
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Solution Overview
Problem
The transmission of uplink signals in display devices can interfere with image signals, leading to deterioration in display quality due to overlapping sensor and display parts.
Innovation Solution
A method where sensors in specific areas of the sensor part transmit uplink signals and inversion signals during different periods, with overlapping areas configured to minimize interference, allowing for acknowledgment, position, and data signal transmission while reducing channel configuration costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors in the sensor part transmit uplink signals for communication with active pen, then communication functionality is improved, but display quality deteriorates due to signal interference with image display
Solution Approach 1:
The sensor part is divided into multiple areas (first area, second area, third area, fourth area) that are configured to transmit different signals (uplink signals and inversion signals) during different periods. This segmentation allows the system to separate communication functions from display functions spatially and temporally, reducing signal interference while maintaining communication capability.
Solution Approach 2:
The patent implements periodic transmission of uplink signals and inversion signals in alternating time periods. During the first period, sensors in the first area transmit uplink signals while sensors in the second area transmit inversion signals. This periodic action allows the system to communicate with active pens while minimizing interference with image display signals through time-division multiplexing.
2Productivity
If sensors transmit uplink signals during overlapping periods, then communication efficiency is improved, but noise components increase leading to display quality deterioration
Solution Approach 1:
The patent applies preliminary anti-action by transmitting inversion signals that are opposite in phase to the uplink signals before the harmful interference occurs. The inversion signals are transmitted from sensors in areas that overlap with the uplink signal transmission areas, creating noise cancellation effects that offset the harmful noise components generated during uplink signal transmission.
Solution Approach 2:
The patent converts the harmful noise components generated during uplink signal transmission into beneficial noise cancellation effects. By strategically transmitting inversion signals from overlapping sensor areas, the system transforms the harmful electromagnetic interference into useful noise cancellation that improves overall signal quality and reduces display degradation.
3Adaptability or versatility
If multiple sensor areas transmit signals simultaneously, then communication capability is improved, but interference with image display signals increases
Solution Approach 1:
The sensor part is segmented into multiple functional areas (first, second, third, and fourth areas) that are assigned different transmission tasks. This segmentation enables the system to maintain communication capability with active pens while isolating the interference from image display signals by spatially separating the transmission functions.
Solution Approach 2:
The patent uses periodic transmission patterns where different sensor areas transmit different signals during different time periods. This temporal separation allows multiple communication functions to operate simultaneously without interfering with each other or with image display signals, as each area transmits in its designated time slot.
Data Source
AI summary
A display device includes a display part and a sensor part overlapping the display part. During a first period, sensors in a first area of the sensor part are configured to transmit a first uplink signal. During the first period, sensors in a second area of the sensor part are configured to transmit a first inversion signal with respect to the first uplink signal. During a second period after the first period, sensors in a third area of the sensor part are configured to transmit a second uplink signal. During the second period, sensors in a fourth area of the sensor part are configured to transmit a second inversion signal with respect to the second uplink signal. The first area at least partially overlaps the fourth area. The second area at least partially overlaps the third area.