Segmented Shift Register Fault Isolation for In-Vehicle Displays
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Solution Overview
Problem
In-vehicle display panels with GIP structure face reliability issues due to potential erroneous operations in TFT-based shift register circuits, leading to display malfunctions, especially in safety-critical applications like in-vehicle electronic clusters, where failures can result in incomplete or incorrect information display.
Innovation Solution
A display device with a shift register GIP circuit that divides the shift register into segments, each with multiple units connected to scan signal lines, and a controller that monitors output and detects malfunctions, allowing for fault-tolerant operation by ensuring that subsequent stages can operate normally even if one segment fails, thereby limiting the defective area to a specific band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift register is divided into multiple segments with independent start signal lines, then fault tolerance is improved and malfunction propagation is prevented, but device complexity increases due to additional start signal lines and control circuitry
Solution Approach 1:
The shift register is divided into multiple independent segments (first shift register segment, second shift register segment, etc.), each with its own start signal line. This segmentation prevents malfunction propagation between segments while maintaining overall system functionality. Each segment can operate independently, so a failure in one segment does not affect other segments.
Solution Approach 2:
Independent start signal lines act as intermediaries between the controller and each shift register segment. The controller can selectively activate specific segments by controlling which start signal lines receive the start signal, enabling precise fault isolation and selective operation of functional segments.
2Use of energy by moving object
If the shift register is segmented into multiple groups, then power consumption is reduced by selective activation, but device complexity increases due to additional clock signal lines and control circuitry
Solution Approach 1:
The shift register is divided into multiple segments that can be selectively activated. By controlling which segments receive start signals and clock signals, power consumption is reduced by keeping non-functional segments in a low-power state while maintaining only necessary segments in active operation.
Solution Approach 2:
The shift register segments are activated periodically or selectively based on operational requirements. The controller can activate specific segments only when needed, rather than continuously operating all segments, thereby reducing overall power consumption while maintaining display functionality.
Data Source
AI summary
A display device includes: a display unit including pixels; a shift register connected to scan signal lines and outputting a pulse signal sequentially, the shift register being divided into shift register segments; a driver generating a clock signal to be supplied to each segment, and a video signal to be input to each pixel; and a controller controlling the driver for generating the clock signal and the video signal, the controller monitoring output of each segment and detecting a malfunction of any of the segments. A shift register unit of a first stage of each segment outputs the pulse signal at a prescribed timing after receiving a start signal. The unit of a stage differing from the first stage outputs the pulse signal at a prescribed timing after receiving a carry signal based on the pulse signal from the unit of a preceding stage.