Display Panel Voltage Control for Sensor-Induced Luminance Drift
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Solution Overview
Problem
Display devices experience luminance deviations due to temperature changes caused by sensors, such as infrared sensors, which affect image visibility.
Innovation Solution
A display device with a first display area and a second display area of different pixel densities, where the second area has higher light transmittance and is supplied with a higher anode initialization voltage when an infrared sensor is operating, and the voltage level is adjusted based on the sensor's operation state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are disposed to overlap portions of the display areas, then the functionality of the display device is improved, but the temperature of the display device locally rises causing luminance deviation
Solution Approach 1:
The patent divides the display area into a first display area with first pixels and a second display area with second pixels. The second display area, which overlaps with the sensor, is configured with different characteristics (lower pixel density, different initialization voltage) to compensate for the local temperature rise caused by sensor operation. This local differentiation allows the system to maintain uniform luminance across the display despite the thermal effect in the sensor-overlapping region.
2Adaptability or versatility
If sensors are disposed to overlap portions of the display areas, then the functionality of the display device is improved, but luminance deviation occurs affecting image visibility
Solution Approach 1:
The patent changes the initialization voltage parameter for pixels in the second display area that overlaps with the sensor. Specifically, a second anode initialization voltage different from the first anode initialization voltage is applied to the second pixels. This parameter change compensates for the luminance deviation caused by sensor operation, ensuring that the overall luminance remains uniform across the entire display area while maintaining sensor functionality.
3Illumination intensity
If different pixel densities are used in different display areas, then luminance compensation is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the display area into a first display area and a second display area based on their functional requirements. The first display area uses first pixels with a first density, while the second display area overlapping with the sensor uses second pixels with a second density. This segmentation allows each region to be optimized independently, achieving luminance uniformity across the entire display while managing the complexity through clear regional differentiation.
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
Compensates for luminance changes due to sensor operation, maintaining consistent image visibility by adjusting pixel initialization voltages in response to sensor activity.
Implementation Method 1
various sensors such as cameras or other image sensors, proximity sensors, fingerprint recognition sensors, illuminance sensors, or infrared (or near-infrared) sensors to name a few, may be disposed to overlap portions of the display areas. Operation of a sensor located on the front surface of the display device may cause the temperature of the display device to locally rise in the area overlapping with the sensor.
Implementation Method 2
Operation of a sensor located on the front surface of the display device may cause the temperature of the display device to locally rise in the area overlapping with the sensor
Data Source
AI summary
A display device including a display panel including a first display area containing first pixels at a first density and a second display area containing second pixels at a second density smaller than the first density, each of the first pixels and the second pixels including a light-emitting element, a power supply circuit configured to supply a first anode initialization voltage to each of the first pixels and supply a second anode initialization voltage to each of the second pixels, and a timing controller configured to control the power supply circuit so that a voltage level of the second anode initialization voltage becomes greater than a voltage level of the first anode initialization voltage.