Display Driving Circuit Self-Testing via Voltage Level Signaling
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Solution Overview
Problem
Existing display panels require additional test circuits for built-in self-testing, which occupy internal space and necessitate changes in overall circuit layout.
Innovation Solution
A display driving circuit with a control circuit that transmits voltage levels to drivers for self-testing without additional test circuits, allowing for built-in self-tests using the original circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional test circuits are added for built-in self-test, then self-testing capability is improved, but internal space occupation increases and circuit layout complexity increases
Solution Approach 1:
The existing driver circuits are designed to perform both their original display driving function and self-testing function. The control circuit transmits voltage levels through the same data lines that connect to pixel circuits, allowing the drivers to test themselves without requiring separate dedicated test circuits. This multi-functionality approach enables built-in self-test while avoiding additional space occupation.
Solution Approach 2:
The driver circuits perform self-testing by autonomously responding to voltage level inputs from the control circuit. Each driver tests its own coupling status with pixel circuits by monitoring voltage level changes, eliminating the need for external test equipment or additional internal test circuits. The system serves itself by using its existing operational mechanisms for both normal function and self-diagnosis.
2Reliability
If additional test circuits are added for built-in self-test, then self-testing capability is improved, but circuit layout complexity increases
Solution Approach 1:
The control circuit utilizes existing data lines and voltage level signaling mechanisms for both normal display operation and self-testing. By transmitting different voltage levels through the same circuit pathways, the system achieves self-testing capability without modifying the overall circuit layout or adding complex test circuitry.
Solution Approach 2:
The self-testing mechanism relies on changing voltage level parameters rather than adding physical test circuits. The control circuit transmits multiple voltage levels (e.g., first voltage level, second voltage level) through existing connections, and drivers respond by returning corresponding voltage levels. This parameter-based approach simplifies the circuit layout while enabling comprehensive self-testing.
Data Source
AI summary
The present application provides a display driving circuit and a method for testing drivers thereof, which is applied to a control circuit for testing a first and a second driver connected in series. The control circuit transmits an enable signal, a first voltage level, and a second voltage level to the first driver for comparing a first returned voltage level and a second returned voltage level of the first driver with a first preset parameter and a second preset parameter. When the first returned voltage level is not equal to the first preset parameter or the second returned voltage level is not equal to the second preset parameter, the control circuit stops testing. Thereby, by using the voltage levels transmitted between the control circuit and the drivers, built-in self-tests may be performed, which simplifies the self-tests of the display driving circuit and no external testing device is required.