Narrow Border In-Cell OLED Touch Panel Structure
Solution Overview
Problem
Existing OLED touch display panels with projected capacitive touch technology have a wide border due to the need for numerous wires connecting sensing conductor lines to a flexible circuit board, making them unsuitable for narrow border designs and compromising touch accuracy.
Innovation Solution
An in-cell active matrix OLED touch panel structure with sensing electrode layers and a thin film transistor layer arranged on one side of the panel, allowing for a narrow border design by positioning conductor blocks and connection lines to correspond with the thin film transistor layer, eliminating the need for circuit connections on three sides and enhancing touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing conductor lines are arranged in a matrix with multiple wires connecting to a flexible circuit board, then touch detection capability is achieved, but the border width increases
Solution Approach 1:
The patent combines the sensing electrode layer with the OLED structure by integrating transparent conductor lines that serve dual purposes: as OLED electrode connections and as touch sensing conductor lines. This merging eliminates the need for separate sensing conductor lines and reduces the number of connections required at the border, thereby reducing border width while maintaining touch detection capability.
Solution Approach 2:
The transparent conductor lines in the OLED structure are designed to perform multiple functions: they serve as electrical connections for the OLED pixels and simultaneously function as the sensing conductor lines for touch detection. This multi-functionality reduces the overall complexity and number of required conductor lines, allowing for a narrower border design.
2Measurement precision
If multiple wires are used to connect sensing conductor lines to the flexible circuit board, then comprehensive touch sensing is achieved, but the arrangement complexity increases
Solution Approach 1:
The patent merges the OLED electrode connections with the touch sensing conductor lines into a single integrated structure. The transparent conductor lines that connect OLED pixels to the driving circuitry simultaneously serve as the sensing lines for touch detection, eliminating the need for separate sensing conductor line arrangements and reducing overall circuit complexity.
Solution Approach 2:
The conductor lines are designed with multi-functionality, serving both as OLED electrode connections and as touch sensing lines. This universal design reduces the number of separate connection arrangements needed, simplifying the overall circuit layout while maintaining comprehensive touch sensing coverage.
3Adaptability or versatility
If conventional projected capacitive touch technique is used, then multi-touch capability is achieved, but the border width increases
Solution Approach 1:
The patent integrates the projected capacitive touch sensing function into the OLED structure itself by using the OLED's transparent conductor lines as the sensing lines. This merging allows multi-touch capability to be achieved without requiring additional separate sensing structures that would increase border width.
Solution Approach 2:
The transparent conductor lines in the OLED structure perform dual functions: driving the OLED pixels and enabling projected capacitive multi-touch sensing. This multi-functionality allows the system to achieve multi-touch capability while maintaining a compact design with reduced border width.
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
The solution enables a narrow border OLED touch panel with improved touch point detection accuracy and higher brightness by optimizing the arrangement of conductor blocks, connection lines, and thin film transistor layers, reducing the use of expensive ITO material and maintaining high conductivity for signal transmission.
Implementation Method 1
an OLED layer configured between the first substrate and the second substrates
Implementation Method 2
a capacitive touch panel uses a capacitance change generated in an electrostatic combination of the arranged transparent electrodes with a human body to generate a current or voltage for detecting touch coordinates
Data Source
AI summary
An in-cell active matrix OLED touch panel structure of narrow border includes first and second substrates, an OLED layer configured between the first and second substrates, first and second sensing electrode layers, and a thin film transistor layer. The first sensing electrode layer includes M first conductor blocks and N connection lines arranged in a first direction. The second sensing electrode layer includes N second conductor blocks arranged in a second direction. Each second conductor block makes use of a corresponding i-th connection line to be extended to one edge of the panel structure. The thin film transistor layer includes K gate lines and L source lines. The M first conductor blocks, the N connection lines, and the N second conductor blocks are disposed at positions corresponding to those of the K gate lines and L source lines of the thin film transistor layer.