Monolithic Touch Driver Integration for Narrow-Bezel Displays
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Solution Overview
Problem
The increasing number of IC chips required for drivers in display devices due to higher resolution and area demands leads to increased manufacturing costs and hinders the development of narrower frames, as these drivers are typically mounted separately from the pixel circuit.
Innovation Solution
A display device with a touch sensor and driver circuits, including a pixel circuit, light-emitting device, and sensor electrode, where the driver circuits are monolithically formed over the same substrate as the pixel circuit, utilizing transistors with metal oxide channels, and a sensor electrode connected through openings in the insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If IC chips are mounted separately on the substrate for driver circuits, then the display device can achieve high resolution and larger area, but the manufacturing cost increases and the frame width cannot be narrowed
Solution Approach 1:
The driver circuit is integrated monolithically with the pixel circuit on the same substrate, merging two previously separate functional blocks into a single device structure. This eliminates the need for separate IC chip mounting and reduces the number of components while maintaining high-resolution display capabilities
2Measurement precision
If IC chips are mounted separately on the substrate for driver circuits, then the display device can achieve high resolution and larger area, but the manufacturing cost increases
Solution Approach 1:
By integrating the driver circuit monolithically with the pixel circuit on the same substrate, the manufacturing process is simplified from multi-step assembly (including IC chip mounting) to a single monolithic fabrication process, thereby reducing manufacturing costs while achieving high display resolution
3Measurement precision
If IC chips are mounted separately on the substrate for driver circuits, then the display device can achieve high resolution and larger area, but the frame width cannot be narrowed
Solution Approach 1:
The driver circuit is merged with the pixel circuit into a single monolithic structure, eliminating the need for separate IC chip mounting areas and associated bonding wires, thereby enabling narrower frame width while maintaining high display resolution
Data Source
AI summary
A display device including a touch sensor and a driver for driving the touch sensor is provided. The display device has a touch panel function, an electrode of the touch sensor is electrically connected to a first driver circuit formed monolithically on a substrate where a pixel circuit is formed. A transistor including a metal oxide in a semiconductor layer can be used in the first driver circuit. The transistor included in the first driver circuit is easily downsized and can operate at high speed. Thus, the area occupied by the circuit can be reduced, which contributes to a narrower bezel.