Shift Register Breakage Detection in Display Devices
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Solution Overview
Problem
Existing in-vehicle display devices with liquid crystal panels face challenges in quickly and easily identifying breakages between the display panel and processing devices, often requiring additional components and increased device size for crack detection.
Innovation Solution
A display device configuration that includes a shift register and control circuit surrounding the display area, using clock pulses and start pulses to detect breakages by monitoring outputs from the last register of the shift register, allowing for quick identification of substrate breakages without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crack detection electrodes are added to detect display panel breakage, then detection capability is improved, but device size increases
Solution Approach 1:
The shift register serves dual functions: driving the display pixels and detecting substrate breakages. By utilizing the existing shift register structure for both display control and breakage detection, the patent eliminates the need for separate crack detection electrodes, thereby maintaining detection capability without increasing device size.
Solution Approach 2:
The shift register performs self-diagnosis by monitoring its own output signals. When a substrate breakage occurs, the shift register detects the anomaly through its inherent signal transmission path, eliminating the need for external detection components and reducing overall device complexity.
2Measurement precision
If multiple components are added for breakage detection, then detection precision is improved, but device complexity increases
Solution Approach 1:
The shift register is designed to perform both display driving and breakage detection functions. By making the existing component multi-functional rather than adding separate detection circuits, the patent achieves precise breakage detection while keeping the overall circuit complexity low.
Solution Approach 2:
The breakage detection function is merged with the display driving function within the same shift register circuit. This consolidation allows the system to achieve both display functionality and breakage detection precision without requiring separate complex detection circuits.
Data Source
AI summary
According to an aspect, a display device includes: a display area provided to a substrate; a shift register including a plurality of registers coupled in series; and a control circuit that supplies clock pulses to the registers, and that supplies a start pulse to a first register of the shift register to acquire an output from a last register of the shift register, wherein the display area is provided in an area surrounded by the shift register, the control circuit, and wiring that couples the shift register to the control circuit.