Gate Driver Start Signal Blocking to Prevent Display Burnt Defects
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Solution Overview
Problem
Display devices experience burnt defects due to timing errors in the output of start signals from a timing controller to a gate driver, leading to abnormal scan signals being input to sub pixels.
Innovation Solution
Incorporating a start control circuit between the timing controller and the gate driver to manage the timing of start signals, ensuring only signals at normal timings are transmitted, thereby preventing simultaneous application of high voltage differences to sub pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timing controller outputs start signals to the gate driver without timing control, then the gate driver can be driven, but timing errors cause multiple scan signals to be simultaneously input to sub pixels causing burnt defects
Solution Approach 1:
A start control circuit is introduced as an intermediary component between the timing controller and the gate driver. This mediator monitors the timing of start signals and selectively transmits or blocks signals to prevent timing errors from reaching the gate driver, thereby eliminating burnt defects without requiring complex modifications to the existing timing controller or gate driver circuits.
Solution Approach 2:
The start control circuit performs preliminary timing verification of start signals before they are transmitted to the gate driver. By checking the timing in advance and blocking improperly timed signals, the system prevents burnt defects before they can occur, rather than attempting to correct or detect them after the fact.
2Reliability
If the start control circuit blocks abnormal start signals, then burnt defects are minimized, but the circuit complexity increases
Solution Approach 1:
The start control circuit serves as a simple intermediary that only performs timing verification and signal blocking functions. It does not require complex control logic or additional components beyond what is necessary for basic timing detection and signal switching, thus minimizing the increase in device complexity while ensuring reliable operation.
3Object-affected harmful factors
If multiple start signals are output simultaneously due to timing error, then the gate driver receives abnormal signals, but adding control circuitry increases device complexity
Solution Approach 1:
The start control circuit acts as a protective intermediary that monitors for simultaneous start signal conditions and blocks them from reaching the gate driver. This simple timing verification and blocking mechanism effectively eliminates the harmful effect of simultaneous voltage application without requiring complex control systems.
Solution Approach 2:
The start control circuit applies preliminary anti-action by detecting and blocking abnormal simultaneous start signals before they can cause burnt defects. This preventive approach counters the potential harmful effect in advance, eliminating the need for complex post-detection or correction mechanisms.
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a display panel in which a plurality of sub pixels connected to a plurality of scan lines is defined, a gate driver which supplies a scan signal to the plurality of scan lines, a timing controller which outputs a plurality of start signals to the gate driver, and a start control circuit connected between the timing controller and the gate driver. When at least two start signals, among the plurality of start signals, are a gate turn-on voltage of a pixel transistor to which the scan signal is supplied, the start control circuit stops outputting the plurality of start signals.