Display Driving Device With Built-In Test Function
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Solution Overview
Problem
Conventional display panel inspection methods are complex and limited, requiring external test apparatuses and fixed test methods, which restrict the ability to test image quality using various patterns and methods, complicating the defect inspection process and aging testing.
Innovation Solution
A display driving device with a built-in test function that stores and controls pattern data for various test patterns, allowing adjustment of display order, time, frame frequency, size, shape, color, and structure, enabling internal generation and display of multiple test patterns without external apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test patterns are received from external test apparatus, then defect inspection can be performed, but the test process becomes complicated and interface conditions must be considered
Solution Approach 1:
The patent merges the test pattern generation function and control function into the display driving device itself. The storage circuit stores multiple test patterns and control data internally, eliminating the need for external test apparatus. This integration simplifies the test process by removing interface requirements while maintaining reliable defect inspection capability through built-in self-testing functionality.
Solution Approach 2:
The display driving device performs self-testing by generating and displaying test patterns internally without requiring external test equipment. The device uses its own resources (storage circuit, control circuit, data driving circuit) to conduct comprehensive defect inspection, thereby reducing test process complexity while ensuring reliable quality verification.
2Device complexity
If a fixed test method is used, then the test process is simple, but the image quality of the display panel cannot be tested in various methods
Solution Approach 1:
The storage circuit is designed to store multiple different test patterns (e.g., black pattern, white pattern, color bar pattern, gradient pattern) and the control circuit can selectively apply different display methods (sequential display, simultaneous display, aging test, defect inspection). This multi-functional design enables versatile image quality testing while maintaining a unified, simple test process architecture within the display driving device.
Solution Approach 2:
The control circuit dynamically adjusts test parameters based on control data, including display order, display time, frame frequency, size, shape, and color of test patterns. This dynamic configurability allows the system to adapt between different test methods and scenarios without requiring complex external control, achieving both versatility and simplicity through programmable flexibility.
3Reliability
If multiple test patterns are displayed sequentially, then comprehensive testing is achieved, but testing time increases
Solution Approach 1:
The control circuit implements periodic action by displaying multiple test patterns in a cyclic sequence according to control data. Different test patterns can be displayed alternately or simultaneously in different regions, allowing comprehensive testing coverage while optimizing test time through efficient time-multiplexed or space-multiplexed display strategies.
Solution Approach 2:
The system transitions from sequential time-based testing to parallel spatial testing by displaying multiple test patterns simultaneously in different display regions. The control circuit can divide the display panel into multiple areas, each showing different test patterns at the same time, thereby achieving comprehensive testing coverage without increasing overall test time, effectively utilizing the spatial dimension to reduce temporal loss.
Data Source
AI summary
A display device having a test function includes a display panel; and a display driving device configured to store pattern data corresponding to test patterns for testing an image quality of the display panel and control data for controlling the pattern data. The display driving device sets a display order and a display time of each of the test patterns by using the control data, and performs driving such that at least two test patterns are displayed on the display panel depending on the control data.