LED Display Control Circuit with Test Module for Intensity Drift
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Solution Overview
Problem
Display devices, particularly LED displays, face challenges in maintaining consistent output intensity over time due to changes in electrical characteristics caused by aging and electrical stress, which affects the quality of images displayed.
Innovation Solution
A system that includes a display control circuit and a test module to dynamically adjust control signals based on real-time measurements of LED electrical characteristics, using test control signals to determine current and voltage relationships, allowing for precise adjustment of PWM signals and current settings to maintain target output intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LED display devices are operated continuously over time, then productivity is improved, but the electrical characteristics of the LEDs change causing output intensity to drift from target values
Solution Approach 1:
The patent implements a feedback mechanism where the test module periodically measures the electrical characteristics of LED display devices and sends correction data to the display control circuit. The control circuit then adjusts the control signals based on measured deviations from target output intensity, creating a closed-loop system that maintains consistency despite aging and electrical stress over continuous operation.
2Measurement precision
If test control signals are applied to measure LED electrical characteristics, then measurement precision is improved, but the display operation is interrupted
Solution Approach 1:
The patent employs periodic action by scheduling test measurements at specific intervals (e.g., between image frames or at predetermined time periods) rather than continuously. This allows the system to periodically assess LED electrical characteristics and apply corrections without constantly interrupting display operation, balancing measurement precision with operational continuity.
Solution Approach 2:
The system performs preliminary measurements of LED electrical characteristics at predetermined intervals before significant drift occurs. By proactively measuring and correcting parameters such as forward voltage and current at scheduled times, the system prevents large deviations in output intensity rather than reacting to them after they occur.
3Reliability
If dynamic adjustment of control signals is implemented, then output intensity consistency is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing the display control circuit to perform both normal display control functions and test/control signal adjustment functions. The same control circuit that drives the LEDs for image display also processes test data and applies corrections, eliminating the need for completely separate testing and control hardware, thus reducing overall system complexity while maintaining output consistency.
4Reliability
If frequent testing of LED characteristics is performed, then reliability of output intensity is improved, but productivity is reduced
Solution Approach 1:
The system performs testing at optimized periodic intervals that balance reliability and productivity. By scheduling tests between image frames or at predetermined time periods rather than before every frame, the system maintains accurate knowledge of LED characteristics without significantly impacting display frame rate and overall productivity.
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 ensures that the display maintains consistent color and brightness by accurately tracking changes in LED characteristics over time, improving the overall performance and longevity of the display device.
Implementation Method 1
A display can be created by assembling an array of LED display devices. Each LED display device of the array can be controlled, based on certain expected electrical characteristics of the LED display devices, to output light of a target intensity to display an image.
Implementation Method 2
The test module is further configured to determine electrical characteristics of the at least one LED based on the at least one test output current
Data Source
AI summary
Systems and methods for controlling a display apparatus are provided. In one example, an apparatus comprises a display comprising a plurality of light emitting diodes (LED), a display control circuit configured to generate display control signals, and a test module configured to generate test control signals. In a test operation mode, at least one LED of the plurality of LEDs is configured to be controlled by the test control signals from the test module to conduct at least one test output current. The test module can determine electrical characteristics of the at least one LED based on the at least one test output current. The display control circuit can adjust the display control signals based on the electrical characteristics of the at least one LED.