Display Driver IC Temperature Control via Weighted Lookup
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Solution Overview
Problem
Existing display devices with light emitting elements in a matrix form face challenges in efficiently controlling temperature, particularly during full white display states, as they generate heat, leading to reduced lifetime and potential damage, and existing solutions either fail to detect temperature rises promptly or complicate the device structure with multiple temperature detectors.
Innovation Solution
A method involving driver ICs that detect exothermic temperatures and generate temperature information, which is then weighted using a look-up table to control the supply current to light emitting elements, allowing for efficient temperature control without the need for individual temperature detectors on each element, thus simplifying the structure and enabling proper control even with irregular temperature distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature detector is provided to each light emitting element to detect temperature rise immediately, then temperature control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses the driver IC's built-in temperature detection function as a copy representation of the light emitting element's temperature state. Instead of placing physical temperature detectors on each element, the system copies the temperature information through the driver IC's monitoring capability, achieving temperature detection without additional hardware complexity.
Solution Approach 2:
The driver IC is given multiple functions: it not only drives the light emitting elements but also serves as a temperature detector for its corresponding region. This multi-functionality eliminates the need for separate temperature detection components, reducing device complexity while maintaining temperature monitoring capability.
2Device complexity
If driver IC temperature detection is used to control supply current, then device complexity is reduced, but temperature control precision may deteriorate due to indirect measurement
Solution Approach 1:
The system implements feedback control by continuously monitoring the driver IC's temperature and using this information to adjust the supply current to the light emitting elements. The temperature detection result feeds back to the control circuit, which modifies the drive current accordingly, creating a closed-loop control system that maintains temperature within acceptable ranges.
Solution Approach 2:
The driver IC acts as an intermediary between the power supply and the light emitting elements, and also as a mediator for temperature detection. By monitoring the driver IC's temperature (which reflects the local thermal environment), the system indirectly measures the temperature condition and uses this information to control the supply current, achieving temperature management without direct element monitoring.
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 allows for immediate detection and management of heat generation, prolonging the lifetime of light emitting elements and simplifying the device structure, while maintaining optimal luminance and temperature control, and can be adjusted independently to suit various conditions without increasing costs.
Implementation Method 1
generating temperature information of the driver IC by detecting an exothermic temperature caused by the consumption power of each of the driver ICs
Implementation Method 2
detecting an exothermic temperature caused by the consumption power of each of the driver ICs
Data Source
AI summary
A method of controlling the temperature of a display device which includes a display panel having a plurality of light emitting elements arrayed in a matrix form, and a plurality of driver ICs is disclosed. The method includes the steps of: generating temperature information of the driver IC by detecting an exothermic temperature caused by the consumption power of each of the driver ICs; and controlling a supply current to the light emitting elements by comparing the temperature information with temperature information added with weighted position information to perform weighting in such a manner that exothermic temperature detection data of the driver IC becomes larger for the driver IC corresponding to an upper area of the display panel by using a look-up table previously formed and stored.