Touch Electrode Layout to Prevent Display Signal Interference
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Solution Overview
Problem
The quality of light emitting display apparatuses is deteriorated due to the influence of uplink signals transmitted from the display apparatus to a touch pen, affecting image output.
Innovation Solution
The light emitting display apparatus is designed with separate areas for supplying gate pulses and uplink signals, where a touch electrode unit includes first and second areas parallel to gate lines, with the touch driver supplying uplink signals during a display period in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uplink signals are transmitted through the touch electrode unit, then touch sensing function is enabled, but image quality deteriorates due to interference with gate pulses
Solution Approach 1:
The display panel is divided into a first area for displaying images and a second area for touch sensing operations. The gate driver supplies gate pulses to gate lines in the first area during display periods, while the touch driver supplies uplink signals to touch driving electrodes in the second area during non-display periods. This spatial and temporal segmentation prevents interference between gate pulses and uplink signals, enabling both display quality and touch sensing function to operate effectively without mutual interference.
2Device complexity
If gate pulses and uplink signals are supplied to the same area simultaneously, then device complexity is reduced, but signal interference occurs affecting display quality
Solution Approach 1:
The gate driver and touch driver operate in periodic alternation. During display periods, the gate driver supplies gate pulses to gate lines while the touch driver remains inactive. During non-display periods, the touch driver supplies uplink signals to touch driving electrodes while the gate driver remains inactive. This periodic action ensures that gate pulses and uplink signals are never supplied simultaneously to the same area, eliminating signal interference while maintaining a relatively simple device structure.
Data Source
AI summary
A light emitting display apparatus in which an area where a gate pulse is supplied is different from an area where an uplink signal is supplied is disclosed. The light emitting display apparatus comprises a light emitting device unit with light emitting devices and gate lines, a touch electrode unit including touch electrodes on the light emitting device unit, and a touch driver sensing a pen touch by driving the touch electrode unit, wherein the touch electrode unit includes a first area and a second area, each of the first area and the second area is in parallel with the gate lines, and in one-frame period, the touch driver supplies an uplink signal to a touch driving electrode in the first area or the second area during a display period in which an image is output from the light emitting device unit.