OLED Initialization Driver Timing Control
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Solution Overview
Problem
The existing OLED displays have a short initialization time for the anode electrode, which is insufficient for fully discharging residual voltage from the previous frame, leading to low response speed and image blur, especially for green light emission, due to the limited active period of the OLED initialization signal.
Innovation Solution
An OLED display with an initialization driver that outputs an OLED initialization signal with a longer active period than the scan signal, allowing sufficient time for initialization and full discharge of residual voltage, and independent operation from the gate driver to improve response speed and reduce image blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the OLED initialization signal has the same active period as the scan signal, then the device complexity is reduced and manufacturing is simplified, but the response speed is insufficient and image blur occurs due to inadequate initialization time
Solution Approach 1:
The patent implements dynamic timing control where the OLED initialization signal has a variable active period that extends beyond the scan signal's active period. Specifically, the initialization driver outputs the OLED initialization signal during the entire active period of the scan signal plus an additional extended period, allowing the total active period to adapt based on initialization requirements rather than being fixed to match the scan signal duration exactly.
Solution Approach 2:
The patent separates the initialization function into an independent initialization driver that operates independently from the gate driver. This segmentation allows the OLED initialization signal to have its own distinct timing characteristics (extended active period) without being constrained by the scan signal timing, enabling optimized initialization performance while maintaining separate control functions.
2Reliability
If the OLED initialization signal active period is extended beyond the scan signal active period, then the initialization is more thorough and response speed improves, but the timing coordination becomes more complex
Solution Approach 1:
The initialization driver receives a start signal that triggers the OLED initialization signal output in advance of the scan signal's active period ending. The extended active period ensures that initialization is completed beforehand, with the signal remaining active during the extended period to guarantee full discharge of residual voltage before the next frame begins.
Solution Approach 2:
The timing controller coordinates the start signals to both the gate driver and initialization driver based on the scan signal timing. The initialization driver's extended active period is carefully controlled to end before the next frame's scan signal begins, providing implicit feedback control that ensures proper timing coordination without requiring complex additional circuitry.
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the display includes a display panel, a data driver, an emission control driver, a timing controller, a gate driver, an initialization driver, and a timing controller. The emission control driver is configured to sequentially apply an emission control signal to emission control lines, the emission control signal configured to determine a light emission period and a non-light emission period. The timing controller is configured to output a first start signal and a second start signal. The gate driver is configured to receive the first start signal from the timing controller, sequentially apply a gate initialization signal to gate initialization lines based on the first start signal, and sequentially apply a scan signal to the scan lines. The initialization driver is configured to receive the second start signal and sequentially apply an OLED initialization signal to the OLED initialization lines.