Short Detection Circuit for Display Data Lines
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Solution Overview
Problem
Existing display panel short detection methods, such as optical measurement, require additional equipment and cannot continuously detect defects during normal operation, leading to potential display quality issues due to current leakage from metal shorts between data lines.
Innovation Solution
A short detection device with a data line driver unit and short detection circuit, including first and second short detection amplifiers and a detection unit, continuously monitors data lines for leakage current, using current mirrors and switch groups to identify shorts between data lines without additional optical equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical measurement method is used to detect short connections, then detection accuracy is improved, but additional equipment and measurement procedures are required, increasing device complexity
Solution Approach 1:
The patent extracts the short detection function from the separate optical measurement system and integrates it into the data line driver unit. The detection unit is built into the driver circuitry, allowing short detection to be performed using existing driver components rather than requiring external optical equipment. This extraction principle resolves the contradiction by eliminating additional equipment while maintaining detection capability.
Solution Approach 2:
The patent combines the short detection function with the data line driver unit, merging two previously separate functions (data driving and short detection) into a single integrated unit. The detection unit shares resources with the driver unit, including power supply connections and control signals. This merging resolves the contradiction by reducing device complexity while preserving measurement precision through the integrated detection capability.
2Reliability
If optical measurement method is used for short detection, then short defects can be detected, but detection can only be performed during testing stage, not during normal operation, reducing continuity of detection
Solution Approach 1:
The patent enables continuous short detection by integrating the detection unit into the data line driver unit that operates during normal display operation. Unlike optical measurement that is limited to testing stages, the integrated detection unit can continuously monitor for shorts throughout the entire operational lifetime of the display device. The detection unit operates concurrently with normal data line driving, providing uninterrupted detection coverage. This continuity principle resolves the contradiction by extending detection from periodic testing to continuous monitoring during all operational phases.
3Measurement precision
If data lines are driven by different operational amplifiers with different gradation voltages, then short detection sensitivity is improved, but voltage level stability may be affected when shorts occur
Solution Approach 1:
The patent introduces a detection unit as an intermediary component that monitors voltage levels and short conditions without disrupting the normal data line driving operation. The detection unit measures voltage deviations caused by shorts while the channel amplifier unit maintains stable gradation voltages for display operation. This intermediary detection approach resolves the contradiction by enabling sensitive short detection through voltage monitoring while preserving voltage level stability for normal display function.
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 continuous and accurate detection of panel shorts, preventing display quality abnormalities by identifying voltage deviations caused by current leakage, even during normal operation, without the need for additional measurement procedures or equipment.
Implementation Method 1
a detection unit connected to an output terminal of the first short detection amplifier or an output terminal of the second short detection amplifier to detect a leakage current generated when a short has occurred between two data lines among the N data lines
Data Source
AI summary
A display device including: a panel unit including N data lines; and a data line driver unit including N channels, wherein the data line driver unit includes a channel amplifier unit, and a short detection device for detecting whether or not a short has occurred between two data lines among the N data lines, wherein N is an integer of 2 or more.