Display Driving Circuit Short Detection via Merged Buffer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display driving circuits fail to effectively detect and locate shorts in data lines of display panels, leading to malfunction and heat generation due to physical changes such as cracks.
Innovation Solution
Incorporating detection circuits and switching circuits that provide detection currents to data lines through detection lines, allowing for the determination of changes in current to identify shorts between data lines or power lines, and accurately pinpointing the shorted position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display driving circuit is designed without short detection functionality, then the device complexity is reduced, but the reliability deteriorates due to undetected shorts causing malfunctions and heat generation
Solution Approach 1:
The detection circuit is merged with the existing output buffer structure. The detection current output unit shares the same physical buffer circuit that drives the data lines, combining detection and driving functions in a single integrated unit. This reduces device complexity while enabling short detection capability.
Solution Approach 2:
The output buffer is designed to serve dual purposes: driving data lines during normal operation and providing detection current for short detection when activated. The same buffer circuit and data lines are used for both driving and detection functions, making the system multi-functional without adding separate dedicated detection hardware.
2Speed
If detection current is provided to all data lines simultaneously, then the short detection speed is improved, but the device complexity increases due to multiple switching circuits
Solution Approach 1:
The data lines are segmented into multiple groups, and detection is performed sequentially for each group rather than all at once. The switching circuit selectively connects different groups of data lines to the detection current output in different time periods, enabling comprehensive detection while using a single reusable buffer circuit for each segment.
Solution Approach 2:
The detection process uses periodic action by sequentially activating detection for different data line groups in repeating cycles. Each group receives detection current during its designated time period, and the switching circuit alternates between groups, achieving thorough detection through time-division multiplexing.
3Measurement precision
If the detection circuit uses separate dedicated circuits for each data line, then the measurement precision of short location is improved, but the device complexity increases
Solution Approach 1:
The detection circuit uses feedback from the state of detection current flow to determine short locations. When a short is detected in a particular data line group, the system receives feedback information about which group is affected, and by analyzing which specific lines within the group show abnormal current characteristics, the precise short location can be determined without needing separate dedicated circuits for each line.
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
Enables the detection of shorts between data lines or power lines and precise location of the shorted position, preventing malfunctions and heat issues in display panels.
Implementation Method 1
a first detection circuit configured to output a first detection current to the first detection line, and output a first detection signal corresponding to a change in the first detection current
Data Source
AI summary
The present disclosure discloses a display driving circuit. The display driving circuit is configured to have a function of detecting a short of a data line occurring on a display panel.