Gamma Voltage Generator for OLED Aging Compensation
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Solution Overview
Problem
The aging of Thin Film Transistors (TFT) and Organic Light Emitting Diode (OLED) devices in display panels leads to a deterioration of display quality and reduced service life over time, affecting the performance and longevity of OLED display panels.
Innovation Solution
A gamma voltage generator is introduced, comprising a control circuit, data storage circuit, digital-to-analog conversion circuit, and output circuit, which outputs different gamma voltages based on distinct operating phases to compensate for the aging of TFT and OLED components, thereby maintaining optimal operation and extending the display panel's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display panel operates continuously with TFT components and OLED devices, then the display panel can maintain normal display function, but the TFT components and OLED devices gradually age, leading to deterioration of display quality and reduced service life
Solution Approach 1:
The patent implements dynamic adjustment of gamma voltages based on the aging state of TFT components and OLED devices. The system transitions from static gamma voltage to dynamic gamma voltage that changes over time, allowing the display panel to adapt to component aging and maintain display quality throughout its service life.
Solution Approach 2:
The patent changes the gamma voltage parameter over time to compensate for component aging. By adjusting the gamma voltage according to the aging degree of TFT and OLED components, the system maintains optimal display performance and extends the effective service life of the display panel.
2Reliability
If a single gamma voltage is used for the entire operating period, then the device structure is simple, but the display quality deteriorates due to component aging
Solution Approach 1:
The patent segments the operating period into multiple phases (first operating phase, second operating phase, etc.) and assigns different gamma voltages to each phase. This segmentation allows the system to address component aging at different stages while maintaining a manageable structure through the use of multiple data memory units.
Solution Approach 2:
The patent pre-stores multiple gamma voltage values in separate data memory units before operation begins. This preliminary preparation allows the system to quickly switch between different gamma voltages based on the current operating phase and aging state, without requiring complex real-time calculations or adjustments.
3Reliability
If multiple gamma voltages are stored for different operating phases, then the display quality can be maintained throughout the service life, but the data storage circuit requires more memory units
Solution Approach 1:
The patent designs the data memory units with universal functionality, where each memory unit can store a complete set of gamma voltage parameters for different operating phases. This multi-functionality reduces the total number of memory units needed, as each unit can serve multiple purposes across different operating conditions.
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 gamma voltage generator effectively mitigates the aging effects on TFT and OLED components, enhancing display quality and extending the service life of OLED display panels by providing tailored gamma voltages for different phases of operation.
Implementation Method 1
a digital-to-analog conversion circuit, electrically connected to the data storage circuit to receive the corresponding digital signal and convert the corresponding digital signal to an analog voltage signal
Data Source
AI summary
A gamma voltage generator, a display device, and a driving method of a display panel. The gamma voltage generator includes a control module, a data storage module, a digital-to-analog conversion module, and an output module which are electrically connected in sequence. The data storage module includes at least a first data memory and a second data memory. The first memory is configured to store and output a first digital signal to enable the output module to output a first gamma voltage in a first operating phase of the display panel. The second memory is configured to store and output a second digital signal to enable the output module to output a second gamma voltage in a second operating phase of the display panel. The first operating phase and a second operating phase are divided in accordance with a chronological order.