Centralized LED Driver for Uniform Sensing Accuracy
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Solution Overview
Problem
Conventional LED sensing systems experience errors due to varying sensing speeds for LEDs near and far from the driving circuit, affecting the accuracy of light-emitting diode performance assessment.
Innovation Solution
An LED sensing system with a driver positioned centrally within the LED array, featuring an activation terminal, address input terminal, row and column selection parts, analog-to-digital converter, and shift register, allowing for uniform inspection of LEDs by applying a constant current and converting output voltage into digital format for serial transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the driving circuit is disposed on the side of the light-emitting diode array, then the device complexity is reduced and ease of manufacture is improved, but the sensing speed becomes non-uniform across different LEDs causing sensing errors
Solution Approach 1:
The driver is moved from a one-dimensional edge position to a two-dimensional central position within the LED array, enabling uniform sensing distance to all LEDs regardless of their position in the array
Solution Approach 2:
The LED array is divided into addressable units with row and column selection parts, allowing systematic sensing of individual LEDs while maintaining the driver's central position
2Measurement precision
If the driver is positioned at the central portion of the LED array, then uniform sensing speed and accuracy are achieved across all LEDs, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The driver performs multiple functions including constant current application, voltage sensing, analog-to-digital conversion, and serial data output, consolidating what would otherwise require separate components
Solution Approach 2:
The driver integrates multiple functional blocks (row selection, column selection, ADC, shift register) into a single centralized component, reducing overall system complexity despite the central positioning
3Ease of manufacture
If conventional side-positioned driving circuit is used, then manufacturing is simpler, but sensing errors occur due to varying distances from the driver to different LEDs
Solution Approach 1:
The driver is repositioned from the edge (one-dimensional placement) to the center (two-dimensional placement) of the LED array, creating equal sensing paths to all LEDs and eliminating position-dependent sensing errors
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 configuration enables consistent and error-reduced sensing of LEDs, optimizing brightness by storing digital output voltages and facilitating real-time inspection of display panels.
Implementation Method 1
apply a constant current to the column input line corresponding to the input address, so as to forwardly conduct the LED corresponding to the input address to output an output voltage
Data Source
AI summary
A LED sensing system and a display panel sensing system are disclosed. The LED sensing system comprises LEDs and a driver. The LEDs are arranged in a LED array, and the driver is disposed on a central portion of the LED array and electrically connected to the LEDs respectively. The driver can receive an activation maintenance signal, and receive an input address, and turn on one of the LEDs corresponding to the input address, so as to obtain a magnitude of a voltage of the LED corresponding to the input address for determining performance of the LED and a yield rate of the LED array.