Touch Display Module Aperture Ratio via Data Line Reuse
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Solution Overview
Problem
Conventional in-cell self-capacitive AMOLED touch display modules have a reduced aperture ratio and shortened service life due to the need for additional touch scanning lines and data lines, which affect the pixel region's performance.
Innovation Solution
The touch display module arranges pixel units between adjacent data lines, with touch scanning lines positioned between data lines to eliminate the need for additional touch scanning lines at the pixel region, allowing for improved aperture ratio and extended service life by using existing signal lines as touch scanning lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional touch scanning lines are arranged at the pixel region, then touch driving function is achieved, but aperture ratio is reduced
Solution Approach 1:
The patent applies multi-functionality by enabling data lines to serve dual purposes: transmitting data signals during display time periods and serving as touch scanning lines during touch time periods. This allows the same physical line structure to perform both display and touch functions, eliminating the need for separate touch scanning lines in the pixel region and thereby maintaining high aperture ratio while achieving complete touch driving capability
Solution Approach 2:
The patent merges the data line and touch scanning line into a single integrated structure. By arranging pixel units in two columns between adjacent data lines and using these data lines for both data transmission and touch scanning, the design combines what were previously separate functional elements into one unified line system, resolving the contradiction between touch functionality and aperture ratio
2Ease of operation
If additional via-holes and touch scanning lines are arranged at pixel region, then touch scanning signal can be applied, but service life of display panel is adversely affected
Solution Approach 1:
The patent extracts the touch scanning function from the pixel region by positioning touch scanning lines in the non-pixel region between data lines. This removes the harmful elements (additional via-holes and touch scanning lines from pixel region) that were degrading panel service life, while still enabling touch scanning signal application through the extracted location in the non-pixel area
Solution Approach 2:
The non-pixel region acts as an intermediary space that facilitates touch scanning signal transmission without interfering with pixel structures. By using this intermediate area between data lines for touch scanning line placement, the patent enables touch functionality while protecting the pixel region from additional via-holes and structural modifications that would reduce service life
3Reliability
If data lines are increased to connect pixel units, then display performance is improved, but number of signal lines increases
Solution Approach 1:
The patent applies multi-functionality by designing data lines to perform dual roles: data transmission during display operations and touch scanning during touch operations. This universal design allows the same set of data lines to maintain display performance while avoiding the need for additional dedicated touch scanning lines, thereby reducing overall signal line complexity
Solution Approach 2:
The patent utilizes parameter changes by switching the functional state of data lines between display time periods and touch time periods. During display periods, data lines transmit data signals; during touch periods, they serve as touch scanning lines. This temporal parameter switching allows one set of lines to replace what would traditionally require two separate sets, reducing device complexity while maintaining display performance
Data Source
AI summary
The touch display module includes touch electrodes, a plurality of pixel units arranged in rows and columns, a plurality of gate lines, and a plurality of data lines crossing the plurality of gate lines. The touch display module further includes a plurality of touch scanning lines. The pixel units in two columns are arranged between every two adjacent data lines, and each data line is electrically connected to the pixel units arranged in two columns and adjacent to the data line. Each touch scanning line is arranged between two adjacent data lines and connected to the corresponding touch electrode. Two gate lines are arranged between every two adjacent rows of pixel units. The pixel units in each row include a first pixel unit and a second pixel unit arranged adjacent to each other.