Temperature-Based Parasitic Capacitance Compensation in Display Pixels
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Solution Overview
Problem
Electronic display devices, such as OLED and micro LED displays, face non-uniformity issues due to temperature gradients and aging, leading to visual anomalies and reduced image quality, which existing compensation methods fail to adequately address.
Innovation Solution
The implementation of adaptive compensation techniques involving pixel sensing and lookup tables to adjust image data, accounting for temperature-induced parasitic capacitance variations, ensures uniform pixel response and improved display fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature compensation is not applied, then device complexity is reduced, but display uniformity and image quality deteriorate due to temperature-induced parasitic capacitance variations
Solution Approach 1:
The system performs preliminary temperature sensing and parasitic capacitance calculation before image display. By pre-calculating the temperature-induced parasitic capacitance variations and determining compensation values in advance, the system eliminates temperature-related display non-uniformity before the actual imaging process occurs, resolving the contradiction between maintaining display uniformity and avoiding complex real-time compensation mechanisms.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that acts between the temperature sensor and the display output. This intermediary layer calculates parasitic capacitance based on temperature readings and applies appropriate compensation to the display signals, thereby decoupling the direct relationship between temperature variations and display non-uniformity while avoiding the need for complex hardware modifications.
2Reliability
If real-time temperature sensing and compensation is implemented, then display performance consistency is improved, but processing time and system complexity increase
Solution Approach 1:
The system performs temperature sensing and parasitic capacitance calculation before image display. By pre-calculating compensation values based on current temperature conditions, the system ensures display performance consistency without requiring time-consuming real-time adjustments during the actual imaging process.
Solution Approach 2:
The patent applies partial compensation by focusing specifically on temperature-induced parasitic capacitance variations rather than attempting to compensate for all possible sources of display non-uniformity. This selective approach maintains display performance consistency while minimizing processing time and system complexity.
3Manufacturing precision
If temperature-based parasitic capacitance compensation is applied, then image quality is enhanced, but computational requirements and processing overhead increase
Solution Approach 1:
The patent applies partial compensation by focusing specifically on temperature-induced parasitic capacitance variations rather than attempting to compensate for all possible sources of display non-uniformity. This selective approach enhances image quality by addressing the dominant temperature-related factor while keeping computational requirements manageable.
Solution Approach 2:
The system changes the parameter being compensated from direct pixel intensity adjustment to parasitic capacitance calculation based on temperature. By transforming the compensation approach to work with temperature-derived parasitic capacitance values rather than directly modifying display parameters, the system enhances image quality while reducing computational complexity.
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 effectively compensates for temperature-related non-uniformities, enhancing image quality by reducing visual artifacts and maintaining consistent display performance across devices and over time.
Implementation Method 1
it is understood that a parasitic capacitance (CG) at a gate of the driver TFT may cause a loss of data voltage (VGS) during emission
Implementation Method 2
temperature-based parasitic capacitance variation compensation
Data Source
AI summary
Systems and methods are presently disclosed that compensate for temperature-based parasitic capacitance variation of a pixel of a display by causing a driver transistor of the pixel to enter an ohmic or linear region. A lookup table is generated based on temperatures at the pixel, diode voltages, and target diode currents or luminances at a diode of the pixel. A correction voltage is determined based on a target diode current or luminance, a temperature at the pixel, and the lookup table. A data voltage is applied corresponding to the target diode current or luminance and the correction voltage to the driver transistor.