VR Display Segmented Scan Control for Luminance
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Solution Overview
Problem
Virtual reality (VR) display devices employing organic light emitting display panels face limitations in increasing luminance due to short light emission duration, which affects user immersion and satisfaction, as conventional scan methods restrict the ability to enhance brightness effectively.
Innovation Solution
A driving method that differentiates scan methods between a focus area and a peripheral area, using a global shutter method for the focus area and a rolling shutter method for the peripheral area, allowing for adjustable light emission duration and power supply voltage to improve brightness and reduce user fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional uniform scan method is used, then the device complexity is low, but the luminance of the display screen cannot be increased effectively
Solution Approach 1:
The display panel is divided into a first area (center area) and a second area (peripheral area), with different scan methods applied to each region. The first area uses a global shutter method for simultaneous pixel activation, while the second area uses a rolling shutter method for sequential activation, allowing optimized luminance control in each region without requiring complete system redesign
Solution Approach 2:
Different scan methods are applied to different regions of the display panel based on their specific requirements. The center area receives the global shutter method to maximize luminance for user focus area, while the peripheral area uses the rolling shutter method to control emission duration, creating locally optimized performance characteristics
2Illumination intensity
If the light emission duration is increased to raise luminance, then the luminance improves, but the frame rate and resolution cannot be maintained
Solution Approach 1:
The display panel is segmented into first and second areas with different emission duration requirements. The first area maintains shorter emission duration to preserve frame rate, while the second area uses longer emission duration to compensate for luminance loss, allowing overall luminance improvement without sacrificing frame rate
Solution Approach 2:
The emission duration parameter is changed differently for different regions. By extending the emission duration in the second area while keeping it shorter in the first area, the system achieves higher overall luminance while maintaining acceptable frame rate through strategic parameter optimization
3Measurement precision
If the addressing time and horizontal period are shortened to increase resolution, then the resolution improves, but the time margin for charging pixels is reduced
Solution Approach 1:
The display panel is divided into regions where the first area prioritizes resolution with shorter charging time requirements, while the second area compensates for reduced charging time by extending emission duration, allowing high resolution to be achieved without complete charging time reduction
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 performance by increasing luminance and reducing VR-related dizziness, thereby improving user immersion and satisfaction, while also reducing power consumption by optimizing power supply voltage and emission duration.
Implementation Method 1
An active matrix type organic light emitting display panel including an organic light emitting diode (hereinafter, referred to as 'OLED') which emits light by itself
Data Source
AI summary
The display device according to the present disclosure may comprise a display panel including data lines and scan lines crossing each other and pixels disposed in a plurality of horizontal lines; a data driving circuit configured to supply data voltages to the data lines; a gate driving circuit configured to supply scan signals for applying the data voltages to the pixels and to supply reset signals for turning off the pixels that are emitting light to the pixels through the scan lines; and a timing controller configured to cause first pixels in a first area to simultaneously emit light and simultaneously stop emitting light, and cause second pixels in a second area different than the first area to sequentially emit light and sequentially stop emitting light by controlling the data driving circuit and the gate driving circuit.