Pixel Driving IC Voltage Sensing for Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display technologies face challenges in detecting defects in LED pixels within large-sized display devices, leading to increased circuit area requirements due to the need for separate defect detection circuits for each pixel.
Innovation Solution
An integrated circuit that senses the voltage of a light emitting diode (LED) pixel and compares it to a reference voltage to detect defects, allowing the same circuit to drive and diagnose pixels, thereby eliminating the need for additional comparator circuits and reducing overall circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate defect detection circuits are added for each pixel, then pixel defect detection capability is improved, but circuit area is increased
Solution Approach 1:
The driving circuit is designed to perform multiple functions: it serves as both the signal driving circuit for the pixel and the defect detection circuit. By reusing the same circuit components for both driving and detection purposes, the patent eliminates the need for separate defect detection circuits, thereby maintaining reliable pixel defect detection capability while avoiding the increase in circuit area that would result from adding dedicated detection circuits for each pixel
2Reliability
If multiple defect detection circuits are added, then defect detection accuracy is improved, but device complexity is increased
Solution Approach 1:
The patent implements defect detection functionality within the existing driving circuit by enabling it to sense the voltage of the light emitting diode and compare it with a reference voltage. This multi-functional design allows the same circuit to serve both as the driving circuit and the defect detection circuit, maintaining accurate defect detection while avoiding the increased structural complexity that would arise from adding separate dedicated detection circuits
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 enables efficient detection of pixel defects without increasing circuit area, allowing for simultaneous defect determination across multiple pixels in a row, thereby minimizing defect determination time and optimizing display device performance.
Implementation Method 1
According to a current flowing through an LED included in each of the pixels, the LED may emit light to display a desired image
Implementation Method 2
sense a voltage (e.g. voltage of anode terminal or forward voltage drop) of a light emitting diode included in each pixel
Data Source
AI summary
The present disclosure relates to an integrated circuit, a pixel driving device and a pixel defect detecting method and provides a device and method to sense a voltage of a light emitting diode of a pixel through a data line and to compare the sensed voltage with a reference range, thereby determining a pixel defect.