Display Device Sensor-Area Pixel Circuit for Unintended Emission Control
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Solution Overview
Problem
Display devices with integrated sensors face issues of unintentional pixel emission due to sensor operations, affecting image quality.
Innovation Solution
The display device incorporates a second pixel circuit in the sensor area with a switching element connected to a power line and controlled by an off-control signal to prevent unintended light emission during sensor operation, utilizing a separate power line and control signal line to manage pixel emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is integrated into the display area, then the functionality of the display device is improved, but unintentional pixel emission occurs due to sensor operation
Solution Approach 1:
The display area is segmented into a first display area for normal pixel operation and a sensor area for sensor integration. Second pixels are specifically configured in the sensor area with different circuit structures (including additional switching elements) compared to first pixels, allowing independent control of pixel emission in the sensor area to prevent unintentional emission during sensor operation.
Solution Approach 2:
Different pixel circuits are used in different regions: first pixel circuits in the first display area and second pixel circuits in the sensor area. The second pixel circuits include additional switching elements (fifth and sixth switching elements) that enable independent control of the light emitting element in the sensor area, allowing the sensor to operate without causing unintentional pixel emission while maintaining normal display functionality in other areas.
2Reliability
If pixels in the sensor area are controlled independently, then image quality is improved, but device complexity increases
Solution Approach 1:
The pixel circuit is segmented into functional modules with different levels of complexity. First pixels use a standard pixel circuit structure, while second pixels in the sensor area use an enhanced structure with additional switching elements. This segmentation allows independent control of sensor area pixels without requiring complete redesign of all pixel circuits, thereby managing complexity while improving image quality.
Solution Approach 2:
The enhanced pixel circuit structure with additional switching elements is applied locally only to second pixels in the sensor area, while first pixels in the display area use the standard structure. This localized approach improves image quality in the sensor area without unnecessarily increasing complexity across the entire display device.
Data Source
AI summary
A display device according to an embodiment includes a display area including a first display area and a sensor area, a first pixel located in the first display area, and including a first pixel circuit and a first light emitting element connected to the first pixel circuit, and a second pixel located in the sensor area, and including a second pixel circuit and a second light emitting element connected to the second pixel circuit, structures of the first pixel circuit and the second pixel circuit being different. The second pixel circuit includes a switching element connected between a power line to which an off voltage of the second light emitting element is applied and the second light emitting element and turned on by an off-control signal.