Display Source Driver Screening Using Multiplexed Test Bus
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Solution Overview
Problem
Conventional methods for testing and correcting voltage degradation in electronic displays, such as LED and OLED displays, are time-consuming and space-intensive, leading to undesirable visual artifacts due to variations in temperature and pixel aging, which affect the current applied to pixels and can result in malfunctioning source drivers and data lines.
Innovation Solution
The implementation of testing circuitry coupled to each pixel to determine current flow and compensate for malfunctioning components, including the use of a test bus to isolate and repair defective source drivers and data lines, allowing for simultaneous testing and minimal additional components, thereby reducing downtime and increasing display resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional test electrodes and external test circuits are used to identify failed source drivers, then component failure detection is achieved, but testing time increases significantly and additional space is consumed on the integrated circuit
Solution Approach 1:
The patent merges the test electrode function with existing data lines by multiplexing them to serve dual purposes: data transmission during normal operation and testing during repair mode. This eliminates the need for separate dedicated test electrodes, reducing space consumption and testing time while maintaining reliable component failure detection capability
Solution Approach 2:
The patent implements multi-functionality by enabling data lines to perform both their primary function of transmitting display data and a secondary function of serving as test electrodes for component failure detection. This universal approach allows the same physical infrastructure to support multiple operations, resolving the contradiction between detection reliability and time/space efficiency
2Reliability
If conventional test electrodes and external test circuits are used to identify failed source drivers, then component failure detection is achieved, but additional space is consumed on the integrated circuit reducing area for additional pixels
Solution Approach 1:
The patent combines the testing function with existing data line infrastructure, eliminating the need for separate dedicated test electrode structures. By merging these functions into the same physical pathways, the patent avoids consuming additional integrated circuit area while maintaining reliable component failure detection
Solution Approach 2:
The patent makes data lines universal by enabling them to function as both data transmission channels and test electrodes. This multi-functional approach maximizes the utilization of existing circuit area, leaving more space available for additional pixels while preserving detection reliability
3Productivity
If display panel sensing is used to identify operational properties of pixels, then performance improvement is achieved, but variations in temperature and pixel aging cause visual artifacts
Solution Approach 1:
The patent implements feedback mechanisms where test circuits measure actual component characteristics (such as source driver output and pixel response) and use this information to adjust drive signals dynamically. This feedback loop compensates for temperature variations and pixel aging effects, maintaining display performance while eliminating visual artifacts caused by environmental factors
Data Source
AI summary
Embodiments disclosed herein provide systems and methods for testing and repairing various aspects of an electronic display. The electronic display includes a reference array and an active array. The electronic display also includes test circuitry used to test individual or any combination of pixels of the electronic display. Switches may be disposed between the pixels and the test circuitry to be to repair the various components of the electronic display.