Display Connection Board Pad Testing Circuit
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Solution Overview
Problem
Existing display devices face challenges in reliably testing the connection state of pads between the connection board and the display panel, which can lead to signal distortion and manufacturing inefficiencies.
Innovation Solution
A display device with a connection board that includes a driving circuit with a comparator to compare voltages at a node with a reference voltage, outputting a contact test signal to indicate the connection state, allowing for the testing of pad connections without additional test apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional external test apparatuses are used to test pad connections, then measurement accuracy can be ensured, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates the test signal generation circuit, switching circuit, and detection circuit directly into the connection board, merging the previously separate testing apparatus with the connection board itself. This integration eliminates the need for external test equipment while maintaining testing functionality, thereby reducing device complexity and manufacturing cost without sacrificing measurement precision
Solution Approach 2:
The connection board performs self-testing by generating test signals internally, switching between normal operation and test modes, and detecting connection states without external intervention. The driving circuit automatically outputs test signals through connection board pads, and the detection circuit autonomously determines connection states, enabling the system to serve its own testing needs
2Reliability
If additional test apparatuses are introduced for pad connection testing, then connection state detection reliability improves, but manufacturing time and cost increase
Solution Approach 1:
By integrating testing functionality into the connection board, the patent eliminates the need for separate testing equipment and procedures. The testing function is combined with the normal operational function, allowing connection state detection to be performed during the same manufacturing process without adding extra steps, thereby maintaining reliability while improving manufacturing efficiency
Solution Approach 2:
The connection board is pre-configured with test signal generation and detection circuits during manufacturing, so that testing capability is built-in before the product reaches the customer. This preliminary integration of testing functionality allows for immediate verification of pad connections without requiring additional testing equipment or time during assembly or quality control
3Ease of operation
If the connection board includes integrated test circuits, then testing can be performed without external apparatus, but the connection board complexity increases
Solution Approach 1:
The driving circuit is designed to perform multiple functions: it drives the display panel during normal operation and generates test signals for connection testing when needed. The switching circuit alternates between normal driving mode and test signal output mode, allowing the same hardware to serve dual purposes. This multi-functionality reduces the need for separate dedicated test components, thereby simplifying the overall structure while maintaining ease of operation
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 efficient testing of pad connections, reducing manufacturing costs and time by determining connection states within the display device, ensuring proper signal transmission without distortion.
Implementation Method 1
a comparator configured to compare a voltage at the first node with a reference voltage and to output a contact test signal corresponding to a comparison result
Implementation Method 2
a pull-up resistor electrically connected between a first voltage terminal and a first node
Data Source
AI summary
A display device includes a display panel including first and second panel pads electrically connected to each other, a connection board including first and second connection board pads connected to the first and second panel pads, respectively, an output pad, and a driving circuit. The driving circuit includes a pull-up resistor connected between a first voltage terminal and a first node, and a comparator configured to compare a voltage at the first node with a reference voltage and to output a contact test signal corresponding to a comparison result to the output pad. The first connection board pad is electrically connected to the first node, and the second connection board pad is connected to a second voltage terminal.