Embedded Touch Sensor in Light Emitting Display Panel
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Solution Overview
Problem
Conventional light emitting display devices with touch sensing functionality face increased thickness and complex manufacturing processes due to the separate integration of touch panels and light emitting display panels.
Innovation Solution
An embedded touch sensor system within the light emitting display device, utilizing a matrix of subpixels with data lines, gate lines, and reference electrodes, where a data driving circuit and reference electrode driving circuit manage voltage levels and signals to enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is separately manufactured and bonded to a light emitting display panel, then touch sensing function is achieved, but device thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the touch sensor and display panel into a single integrated structure. The touch sensor includes a touch electrode layer formed on the same substrate as the display panel, with shared transparent electrode layers and conductive structures. This integration eliminates the need for separate touch panels and bonding processes, directly reducing device thickness while maintaining touch sensing functionality.
Solution Approach 2:
The transparent electrode layer serves multiple functions: it acts as both the touch sensor electrode for detecting touch input and as part of the display structure for light emission. The same conductive layers and transistor structures are utilized for both display driving and touch sensing operations, reducing the need for separate dedicated components and simplifying the overall device architecture.
2Adaptability or versatility
If a touch panel is separately manufactured and bonded to a light emitting display panel, then touch sensing function is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the manufacturing processes for touch sensors and display panels into a single unified process. Both structures are formed on the same substrate using the same sequence of deposition, patterning, and etching steps. This eliminates multiple bonding processes, alignment procedures, and separate manufacturing lines, directly reducing manufacturing complexity.
Solution Approach 2:
The patent segments the manufacturing process into distinct functional layers (touch electrode layer, display electrode layer, transistor layers) that can be independently patterned and formed using standard semiconductor fabrication techniques. This modular layer-by-layer approach simplifies the overall manufacturing process while enabling complex integrated functionality.
3Adaptability or versatility
If reference electrodes are used for touch sensing, then touch sensitivity is improved, but voltage management complexity increases
Solution Approach 1:
The patent implements reference electrodes that are maintained at a stable reference voltage potential during touch sensing operations. These reference electrodes are strategically positioned and electrically connected to voltage lines that provide equipotential regions, enabling accurate touch detection by providing a stable voltage baseline for comparison with touch electrode signals.
Solution Approach 2:
The patent employs periodic switching between display driving mode and touch sensing mode. During touch sensing periods, the reference electrodes are activated and maintained at reference voltage levels, while during display periods, normal display driving occurs. This time-division multiplexing simplifies voltage management by activating reference voltage lines only when needed for touch sensing.
Data Source
AI summary
Disclosed are a light emitting display device, a light emitting display panel, a driving circuit, and a driving method. A light emitting display device, a light emitting display panel, a driving circuit, and a driving method with an embedded touch sensor are provided in which a data voltage and a first reference voltage are supplied to a plurality of data lines and a plurality of reference electrodes which are arranged in the light emitting display panel in a first driving period, and a second reference voltage different from the first reference voltage is supplied to one or more of the plurality of reference electrodes in a second driving period different from the first driving period.