Adaptive Initialization Voltage Control for Display Panel Black Image Leakage
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Solution Overview
Problem
Organic light emitting display devices face issues with slow frame response speed and display quality deterioration due to insufficient current supply and leakage currents, leading to unwanted light emission during black image rendering.
Innovation Solution
A display device with a bypass transistor and adaptive initialization voltage control, where offset voltages are determined based on image data brightness, temperature, and pixel density to optimize light emitting element operation, preventing unnecessary light emission during black image rendering and enhancing frame response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed initialization voltage is applied to the light emitting element, then the device structure is simple, but the frame response speed becomes slow and display quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the initialization voltage adaptive rather than fixed. The voltage is dynamically adjusted based on real-time detection of black image areas and image data characteristics, allowing the system to optimize frame response speed for different display conditions without using a single fixed voltage value.
Solution Approach 2:
The patent changes the parameter of initialization voltage based on detected image characteristics. By monitoring the proportion of black image areas and analyzing image data, the system modifies the voltage parameter to achieve optimal performance - higher voltage for images with more black areas to improve response speed, and lower voltage for images with fewer black areas to maintain display quality.
2Productivity
If insufficient current is supplied to the light emitting element, then power consumption is reduced, but the frame response speed becomes slow
Solution Approach 1:
The patent applies local quality by providing different initialization voltages to different pixel regions based on their specific conditions. Pixels in areas with black images receive higher voltage to ensure fast response, while pixels in areas with non-black images receive appropriate voltage levels. This localized voltage adjustment optimizes response speed where needed without unnecessarily increasing power consumption across the entire display.
Solution Approach 2:
The system dynamically adjusts current supply based on real-time image analysis. By detecting the proportion of black image areas and adapting the initialization voltage accordingly, the system provides sufficient current only when and where frame response speed is critical, rather than maintaining high current supply continuously, thus optimizing the balance between response speed and power consumption.
3Reliability
If leakage current causes the light emitting element to emit light during black images, then the light emitting element is always on, but display quality deteriorates with unwanted light emission
Solution Approach 1:
The patent implements feedback by continuously monitoring the display output to detect black image areas and using this information to adjust the initialization voltage. The system analyzes whether the light emitting element is emitting light during black image periods and responds by adjusting voltage to prevent unwanted emission, thereby maintaining display quality through closed-loop control.
Solution Approach 2:
The system changes the voltage parameter based on detected leakage current effects. When black images are detected and unwanted light emission is identified, the initialization voltage is adjusted to compensate for leakage current and prevent the light emitting element from remaining illuminated. This parameter adjustment restores display quality without requiring complex additional hardware.
4Productivity
If adaptive voltage control is implemented to improve frame response speed, then display characteristics are enhanced, but the control mechanism becomes more complex
Solution Approach 1:
The patent applies self-service by having the system automatically analyze its own performance characteristics and adjust voltage without external intervention. The display device monitors its own frame response characteristics and black image area proportions, then autonomously determines appropriate initialization voltages. This self-adjusting mechanism improves response speed while avoiding the need for complex external control systems.
Solution Approach 2:
The system uses parameter changes based on measurable display characteristics - specifically the proportion of black image areas and frame response time - to determine initialization voltage. By linking voltage adjustment to these directly measurable parameters, the system achieves improved response speed through a relatively straightforward control mechanism rather than complex algorithms or hardware.
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
The adaptive initialization voltage control improves display characteristics by preventing light emission during black images and increasing frame response speed, thereby enhancing overall display quality and power efficiency.
Implementation Method 1
An organic light emitting display device includes a light emitting diode, and the light emitting diode emits a light through recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel including pixels each including a light emitting element and a bypass transistor connected to the light emitting element to receive an initialization voltage, a first offset voltage determining unit determining a first offset voltage using a brightness period of image data and a temperature of the display panel, a black image detecting unit detecting black data among the image data to determine a dense area of the pixels to which the black data are applied, and determining whether to proceed with a subsequent operation, an image analyzing unit analyzing the image data depending on the determination of whether to proceed with the subsequent operation, and outputting an analyzed result, and a second offset voltage determining unit determining a second offset voltage using the analyzed result. The initialization voltage is determined using the first offset voltage and the second offset voltage.