LED Display Threshold Voltage Compensation via Temperature-Adaptive Current
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Solution Overview
Problem
Existing display apparatuses face challenges in maintaining optimal image quality due to deviations in light emitting diodes, which are not adequately compensated for, leading to reduced visibility and image quality.
Innovation Solution
A display apparatus that includes a temperature sensor and a control circuit to identify the appropriate current value based on the temperature, allowing for precise compensation of the display panel by determining the threshold voltage of the light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed current value is used for threshold voltage identification regardless of temperature, then the device complexity is reduced, but the measurement precision of the threshold voltage decreases due to LED deviations
Solution Approach 1:
The patent applies parameter changes by selecting different current values based on temperature conditions. The control circuit identifies whether the current temperature corresponds to a first temperature or a second temperature, and accordingly selects a first current value or a second current value for threshold voltage identification. This dynamic parameter adjustment compensates for LED deviations caused by temperature variations, improving measurement precision without requiring complex compensation operations.
2Reliability
If temperature-based current selection is implemented, then the image quality is improved through precise compensation, but the device complexity increases due to additional temperature sensing and control logic
Solution Approach 1:
The patent implements parameter changes by dynamically selecting current values based on temperature conditions. The control circuit contains logic to identify the current temperature state and select the appropriate current value (first or second) from stored values. This approach maintains reliable image quality across varying temperatures while keeping the compensation system relatively simple through straightforward conditional selection rather than complex real-time 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 improves the image quality of the display apparatus by performing targeted compensation based on the temperature state of the apparatus, thereby enhancing visibility and image fidelity.
Implementation Method 1
a temperature sensor; and a control circuit configured to identify a threshold voltage of the light emitting diode using the first current value when a temperature sensed by the temperature sensor corresponds to the first temperature
Data Source
AI summary
According to an aspect of the present disclosure, a display apparatus may include a display panel in which a pixel circuit including a light emitting diode and a driving transistor connected to the light emitting diode is disposed; a memory configured to store a first current value corresponding to a first temperature and a second current value corresponding to a second temperature; a temperature sensor; and a control circuit configured to identify a threshold voltage of the light emitting diode using the first current value when a temperature sensed by the temperature sensor corresponds to the first temperature, and identifies the threshold voltage of the light emitting diode using the second current value when the temperature sensed by the temperature sensor corresponds to the second temperature.