Temperature Sensors on Display Active Area for Color Calibration
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Solution Overview
Problem
Electronic device displays experience color shifts due to temperature changes, leading to variations in luminance and chromaticity, which existing calibration methods struggle to accurately compensate for, resulting in inconsistent color representation.
Innovation Solution
Incorporating temperature sensors close to the pixel material on the TFT glass to measure temperature differences and adjust display colors dynamically, using VGS differences and resistance measurements to ensure accurate color calibration across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature sensors are placed away from pixel material, then device complexity is reduced, but temperature measurement precision deteriorates
Solution Approach 1:
The patent merges the temperature sensing function with the existing TFT array structure by implementing temperature sensors directly on the TFT glass substrate in close proximity to pixel material. This integration approach reduces device complexity by utilizing existing structural elements while achieving high temperature measurement precision through strategic placement near the light-emitting components.
2Measurement precision
If temperature sensors are placed close to pixel material, then temperature measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functional temperature sensors that can measure temperatures at multiple locations within the display structure. These sensors serve dual purposes: providing accurate temperature data for color calibration while also potentially serving as part of the display's thermal management system. This universal approach reduces overall device complexity by consolidating functions.
Solution Approach 2:
The TFT array structure itself is utilized to implement the temperature sensing functionality. The existing conductive materials and transistor structures within the TFT glass are leveraged to create temperature sensors, eliminating the need for separate dedicated sensor components and reducing overall device complexity while maintaining measurement precision.
3Device complexity
If display operates without temperature compensation, then device complexity is reduced, but color accuracy deteriorates
Solution Approach 1:
The patent implements a feedback-based temperature compensation system where temperature sensors continuously monitor the display's thermal state and provide real-time data to a control mechanism. This feedback loop enables dynamic adjustment of pixel values to compensate for temperature-induced color shifts, maintaining color accuracy without requiring complex manual calibration procedures.
Solution Approach 2:
The system dynamically changes display parameters (pixel RGB values) based on measured temperature conditions. By adjusting these parameters in response to temperature variations, the system maintains consistent color representation across different operating temperatures without requiring fundamentally complex calibration infrastructure.
4Manufacturing precision
If display operates with temperature compensation, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or manual calibration systems with an electronic temperature compensation mechanism. By using electronic sensors and software-based adjustments to pixel values, the system achieves high color accuracy without the complexity of physical calibration hardware or manual adjustment mechanisms.
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 solution effectively reduces temperature-induced color shifts, maintaining consistent color representation and luminance by applying precise adjustment values to RGB channels, ensuring stable display performance across temperature changes.
Implementation Method 1
the resistance, indicative of temperature, of a conductive material
Implementation Method 2
a current indicative of temperature-dependent mobility
Data Source
AI summary
An apparatus is disclosed. In some examples, the apparatus comprises a display panel comprising a plurality of display pixels. In some examples, the apparatus comprises a plurality of temperature sensors disposed at different portions the display panel, wherein the plurality of temperature sensors comprise ratioed pairs of thin film transistors and the ratioed pairs of thin film transistors are formed on the display panel. In some examples, the apparatus comprises control circuitry for changing illumination properties of the plurality of display pixels based on changes is temperature detected by a proximate temperature sensor of the plurality of temperature sensors. In some examples, the ratioed pairs of thin film transistors are operated in a sub-threshold mode.