Scan Driver OE Signal Segmentation for OLED Compensation
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Solution Overview
Problem
Organic light emitting display devices face issues with deteriorating organic light emitting diodes and driving transistors, leading to suboptimal display luminance, which existing compensation methods struggle to fully address.
Innovation Solution
A display device and method that incorporate a scan driver generating distinct OE signals for image display and sensing periods, controlling switching and sensing transistors to optimize the operation of organic light emitting diodes, thereby simplifying the scan driver and improving display quality by selectively activating sensing scan lines and receiving sensing signals from specific pixel rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation circuits are placed inside the pixels, then pixel deterioration can be compensated, but the circuit structure within the pixels becomes complex
Solution Approach 1:
The patent divides the compensation function into two parts: sensing transistors remain inside the pixels while the compensation circuitry is placed outside the panel. This segmentation allows pixel-level sensing without burdening the pixel circuit structure with full compensation functionality.
Solution Approach 2:
The patent extracts the compensation circuitry from the pixel structure and places it outside the panel. Only the essential sensing transistors remain in the pixels, while the complex compensation processing is moved to external circuits that can access the sensing signals.
2Reliability
If sensing scan lines are activated for all pixel rows, then sensing signals can be received from all pixels, but the scan driver complexity increases
Solution Approach 1:
The patent implements partial sensing by activating sensing scan lines for only specific pixel rows rather than all rows. This allows selective compensation for deteriorated pixels in certain regions while reducing the overall complexity of the scan driver structure.
Solution Approach 2:
The display panel is divided into multiple pixel rows, and sensing is performed selectively on specific rows. This segmentation allows the scan driver to manage sensing operations in a more manageable way, reducing its complexity while still achieving effective compensation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances display quality by effectively compensating for transistor and diode deterioration, improving luminance and extending the lifespan of organic light emitting display devices through targeted signal management.
Implementation Method 1
an organic light emitting diode connected to a pixel circuit including a driving transistor connected to the organic light emitting diode
Data Source
AI summary
A display device includes a display part including an organic light emitting diode (OLED) connected to a pixel circuit connected to a scan line and a sensing scan line, a signal generator configured to generate at least one display output enable (OE) signal during an image display period; and generate at least one sensing OE signal during a sensing period; and a scan driver including a display scan signal terminal connected to the scan line and a sensing scan signal terminal connected to the sensing scan line, wherein the scan driver is configured to: generate a scan signal for turning on the switching transistor in response to the display OE signal during the image display period; and generate a sensing scan signal for turning on the sensing transistor in response to the sensing OE signal during the sensing period.