Gate Driver Error Detection in Display Devices
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Solution Overview
Problem
Existing display devices face challenges in reliably detecting operation errors of gate drivers when at least some circuit elements are disposed in the display region, as conventional methods are not sufficient to ensure accurate detection of normal operation.
Innovation Solution
A display device configuration that includes a display panel with gate lines and source lines, gate line driving circuitry with multiple gate drivers, a control circuit for supplying control signals, and a signal processing circuit to output detection signals based on scanning signals, allowing for reliable detection of gate driver operation errors by distinguishing between driven and non-driven gate drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If gate drivers are disposed in the display region, then the display device can achieve higher integration and smaller frame region, but it becomes more difficult to reliably detect operation errors of the gate drivers
Solution Approach 1:
The gate line driving function is segmented into multiple gate drivers (first gate driver and second gate driver) that can be independently controlled. This segmentation allows the system to selectively drive only the necessary gate drivers, enabling error detection by comparing expected vs. actual scanning behavior of individual gate drivers within the display region.
Solution Approach 2:
A feedback mechanism is implemented where the control circuit receives scanning signals from gate drivers and generates detection signals based on the relationship between control signals and scanning signals. This feedback loop enables continuous monitoring and reliable detection of operation errors even when gate drivers are integrated in the display region.
2Use of energy by moving object
If multiple gate drivers are driven alternately to reduce power consumption, then energy efficiency improves, but it becomes more complex to detect whether each gate driver is operating normally
Solution Approach 1:
The system dynamically switches between different driving modes (alternating drive mode and simultaneous drive mode) based on operational requirements. The control circuit can flexibly control whether to drive the first gate driver, second gate driver, or both, enabling power savings while maintaining a relatively simple detection mechanism that adapts to the current driving mode.
Solution Approach 2:
The control circuit serves multiple functions: it generates control signals for driving gate drivers, receives scanning signals from gate drivers, generates detection signals for error detection, and controls the driving mode. This multi-functionality reduces the need for separate dedicated detection circuits, simplifying the overall system while enabling error detection in alternating drive modes.
3Reliability
If all gate drivers are driven simultaneously, then detection of operation errors becomes simpler, but power consumption increases
Solution Approach 1:
The system implements partial driving where only the necessary gate drivers are activated at any given time. In alternating drive mode, only one gate driver is driven at a time, reducing power consumption. The detection mechanism is designed to work effectively with this partial action by monitoring the scanning signals from the actively driven gate driver and comparing them against expected behavior based on control signals.
Data Source
AI summary
The display device includes a display panel, gate line driving circuitry that includes gate drivers provided for each of gate lines, a control circuit, and a signal processing circuit. The control circuit supplies a control signal to at least one gate driver corresponding to a gate line to be scanned first in a unit period in which the gate lines are scanned. The gate driver which received the control signal is driven on the basis of the control signal, and the gate drivers in subsequent stages are each driven on the basis of a scanning signal of the gate driver in a preceding stage. The signal processing circuit outputs, on the basis of a scanning signal of at least one gate driver corresponding to a gate line to be scanned last in the unit period and the control signal, a detection signal that indicates whether the gate driver is normal.