Panel Driving Circuit Internal Test Pattern Generation
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panel driving circuits require external testing devices to generate test patterns, making the testing process complex and dependent on external signal conditions.
Innovation Solution
A driving circuit with a pattern generation unit and selection unit that produces and selects pattern test data and signals, including horizontal and vertical synchronizing signals, and a data activating signal, based on a system clock, allowing for internal generation and application of test patterns to the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external testing devices are used to generate test patterns, then the panel testing can be performed, but the testing process becomes complex and dependent on external signal conditions
Solution Approach 1:
The driving circuit is designed to generate test patterns and control signals internally without requiring external testing devices. The pattern generation unit creates test data and the control signal generation unit produces necessary control signals, enabling the system to test itself autonomously.
Solution Approach 2:
The patent combines the pattern generation functionality and control signal generation functionality directly into the driving circuit. This merging eliminates the need for separate external testing devices and simplifies the overall testing architecture by integrating multiple functions into a single unit.
2Reliability
If external testing devices are used to provide test signals, then panel testing can be performed, but the system becomes dependent on external signal conditions
Solution Approach 1:
The driving circuit generates all necessary test signals and patterns internally through its integrated pattern generation unit and control signal generation unit, eliminating dependency on external testing devices and external signal conditions.
Solution Approach 2:
The driving circuit is designed to perform multiple functions: it can drive the liquid crystal panel during normal operation and simultaneously generate test patterns and control signals for panel testing. This multi-functionality reduces dependency on external devices by making the driving circuit self-sufficient for both operation and testing.
3Manufacturing precision
If the driving circuit interfaces directly with the graphic processor in video interface mode, then image quality is improved and CPU burden is reduced, but the driving circuit cannot generate test patterns internally
Solution Approach 1:
The patent merges the pattern generation unit and control signal generation unit into the driving circuit that operates in video interface mode. This integration allows the driving circuit to maintain its direct interface with the graphic processor for high-quality image display while simultaneously possessing the capability to generate test patterns internally for testing purposes.
Solution Approach 2:
The driving circuit is designed with multi-functionality, enabling it to operate in video interface mode for high-quality image display while also generating test patterns and control signals internally. This eliminates the need to switch between different operating modes or use external testing devices.
Data Source
AI summary
A panel driving circuit that produces a panel test pattern and a method of testing a panel are provided. The driving circuit includes a pattern generation unit and a selection unit. The pattern generation unit responds to a system clock and produces pattern test data and pattern test signals. The selection unit responds to a test signal and selects and outputs either (a) the pattern test data and the pattern test signals that are outputted from the pattern generation unit, or (b) the pattern test data and pattern test signals that are directly applied from the outside. The driving circuit and the method of the panel test generates the panel test data, the horizontal synchronizing signal, the vertical synchronizing signal, and the data activating signal within the driving circuit using a system clock so that the testing of the panel can be carried out without using a separate test device.