Display Panel Lightning Test Circuit With ESD Protection Resistors
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Solution Overview
Problem
Transistors in lightning test circuits of display devices are vulnerable to damage from external static electricity during pixel lighting tests, leading to potential defects and luminance differences in the display panel.
Innovation Solution
Incorporating resistors adjacent to the lightning test circuit transistors on a flexible printed circuit board to dissipate static electricity and protect the transistors from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If transistors are used in the lightning test circuit to switch the test signal, then the pixel lighting test can be performed, but the transistors are vulnerable to damage from external static electricity
Solution Approach 1:
A resistor is introduced as an intermediary component between the transistor and the external environment. The resistor is connected in parallel with the transistor, serving as a protective pathway that diverts static electricity away from the transistor while allowing the test signal to pass through normally. This intermediary component enables the lighting test to proceed while protecting the transistor from static damage.
Solution Approach 2:
The resistor is pre-installed in parallel with the transistor before any static electricity damage can occur. This beforehand protective measure creates a safety pathway that cushions the transistor against future static discharge events, ensuring the transistor remains protected during the lighting test and subsequent operations.
2Reliability
If resistors are added to protect transistors from static electricity, then transistor damage is prevented, but the device complexity increases
Solution Approach 1:
The resistor serves as a simple intermediary component that provides protection without requiring complex circuitry. By connecting the resistor in parallel with the transistor, the design achieves transistor protection using a single additional component rather than a complex protective circuit, thereby minimizing the increase in device complexity.
3Reliability
If resistors are placed adjacent to the lightning test circuit, then static electricity is dissipated, but luminance difference may occur in the display panel
Solution Approach 1:
The resistor is placed locally adjacent to the lightning test circuit where it is most effective at dissipating static electricity. This localized placement ensures that the protective function is achieved at the critical point without requiring resistors throughout the entire display panel, thereby minimizing the overall impact on luminance uniformity while maintaining effective static protection.
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
Prevents or reduces damage to transistors in the lightning test circuit, maintaining consistent luminance and reducing defects in the display panel during pixel testing.
Implementation Method 1
a first resistor adjacent to one side of the lightning test circuit to be connected to the gate electrode and the first electrode, and a second resistor adjacent to the other side of the lightning test circuit to be connected to the gate electrode and the first electrode
Data Source
AI summary
A display device includes: a display panel including a pixel connected to a scan line and a data line; a flexible printed circuit board connected to the display panel; a lightning test circuit on the flexible printed circuit board and connected to the data line; and a plurality of resistors adjacent to opposite sides of the lightning test circuit and connected to the lightning test circuit.