Touch Sensor Integration in Display Device Polarizer
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Solution Overview
Problem
Existing display devices face challenges in integrating a touch sensor without additional layers or flexible printed substrates, particularly in organic EL display devices, which require efficient signal transmission and electrode arrangements that do not interfere with the display functionality.
Innovation Solution
A display device structure incorporating a substrate with a display region, terminal part, polarizer, retardation plate, and intersecting wirings, where the polarizer and retardation plate overlap the display and terminal parts, and are connected via lead-out lines and adhesive layers with conductive particles, allowing for electrostatic capacitance detection and touch sensing without additional electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor is integrated into an organic EL display device, then touch sensing functionality is achieved, but the structure becomes more complex and may interfere with display performance
Solution Approach 1:
The patent merges the touch sensor electrodes with the display device's existing polarizer and retardation plate structures. The first wirings are arranged in the polarizer and the second wirings in the retardation plate, combining multiple functions into existing components without adding separate touch sensor layers.
Solution Approach 2:
The polarizer and retardation plate serve dual functions: maintaining display performance and enabling touch sensing. The first wirings in the polarizer and second wirings in the retardation plate both contribute to optical performance and touch electrode functionality, making these components multi-functional.
2Adaptability or versatility
If additional electrode layers are added for touch sensing, then touch sensor functionality is achieved, but the number of layers increases and manufacturing complexity increases
Solution Approach 1:
The touch sensor electrodes are merged with the optical compensation films. The first wirings are formed in the polarizer layer and second wirings in the retardation plate layer, combining touch sensing electrodes with existing optical components to avoid additional manufacturing steps.
Solution Approach 2:
The polarizer and retardation plate serve dual purposes as both optical compensation films for display performance and as substrates for touch sensor electrodes, eliminating the need for separate touch sensor manufacturing processes.
3Length of stationary object
If the polarizer and retardation plate overlap the terminal part, then lead-out lines can be extended, but the wiring arrangement becomes more complex
Solution Approach 1:
The wirings are arranged in intersecting directions with the first wirings extending in one direction and the second wirings in a perpendicular direction. This two-dimensional wiring arrangement allows lead-out lines to be extended in multiple directions from the display region to the terminal part.
Data Source
AI summary
A display device includes a substrate including a display region arranged with pixels, and a terminal part on the outside of the display region, a polarizer overlapping the display region and the terminal part, the polarizer arranged with first wirings, a retardation plate overlapping the display region and the terminal part, the retardation plate between the pixels and the polarizer, and second wirings arranged in a direction intersecting the direction the first wirings is arranged, wherein an interval the first wirings is arranged is narrower than an interval the second wirings is arranged, the first wirings and the second wirings are arranged sandwiching a dielectric body, the first wirings and the second wirings are connected to a lead-out line, and an end of the retardation plate at the terminal part is closer to the display region than an end of the polarizer.