Driver Circuit Short-Circuit Shielding for AMOLED Yield
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Solution Overview
Problem
In the production of AMOLED display devices, signal line leads remaining after test signal lines are cut off can corrode and oxidize, leading to short circuits between the driver chip and signal line leads, preventing normal display functionality.
Innovation Solution
A driver circuit with short-circuit shielding circuits, comprising diodes and control sub-circuits, is introduced to control the connection between signal line leads and signal lines, enabling the signal line leads to transmit test signals during the lighting test and disconnecting them during the module lighting period to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If test signal lines are cut off from the display substrate after lighting test, then the display substrate can proceed to module bonding process, but the signal line leads remaining on the substrate corrode and oxidize causing short circuits
Solution Approach 1:
The patent extracts and removes the test signal lines from the display substrate after the lighting test is completed. By cutting off the test signal lines, the system eliminates the source of potential short circuits while preserving the necessary signal line leads for normal operation, thus resolving the contradiction between productivity improvement through test line removal and reliability maintenance of remaining leads.
Solution Approach 2:
The patent introduces an isolation mechanism that acts as an intermediary between the signal line leads and the external environment. This isolation layer prevents direct contact between the signal line leads and corrosive elements, thereby maintaining lead integrity while allowing the leads to remain connected for normal display operation.
2Ease of operation
If signal line leads remain connected to test signal lines during lighting test, then the display substrate can be tested, but short circuits occur when driver chip drives the display substrate after test
Solution Approach 1:
The patent implements a dynamic switching mechanism that changes the connection state of signal line leads based on operational phase. During the lighting test phase, the leads are connected to test signal lines for testing purposes. After testing, the system dynamically switches to disconnect test lines while maintaining necessary connections for normal operation, thus resolving the contradiction between test accessibility and operational reliability.
Solution Approach 2:
The patent segments the signal transmission path into distinct functional sections: test signal lines, signal line leads, and display substrate signal lines. This segmentation allows independent control and management of each section, enabling the test lines to be disconnected while preserving the integrity and functionality of the remaining signal path components.
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
The solution ensures that the display substrate can perform lighting tests normally and display correctly during the module lighting period by preventing short circuits and maintaining signal integrity, thereby improving the yield of display substrates.
Implementation Method 1
each of the plurality of short-circuit shielding circuits includes one of a first diode and a second diode; an anode of the first diode is coupled with one signal line lead which is one of the plurality of signal line leads and which is coupled with the short-circuit shielding circuit including the first diode; and a cathode of the first diode is coupled with corresponding one of the first signal lines; a cathode of the second diode is coupled with one signal line lead which is one of the plurality of signal line leads and which is coupled with the short-circuit shielding circuit including the second diode; and an anode of the second diode is coupled with corresponding one of the second signal lines
Data Source
AI summary
The present disclosure provides a driver circuit and its working method and a display device. The driver circuit includes: a driver chip coupled with a plurality of signal lines; a plurality of signal line leads that are corresponding to the plurality of signal lines in a one-to-one manner; and a plurality of short-circuit shielding circuits that are corresponding to the plurality of signal line leads in a one-to-one manner. Each of the plurality of short-circuit shielding circuits is coupled between corresponding one of the plurality of signal line leads and corresponding one of the plurality of signal lines, and is configured to turn on or off a connection between the corresponding one of the plurality of signal line leads and the corresponding one of the plurality of signal lines.