Display Panel Defect Inspection via Input Sensor Jitter
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Solution Overview
Problem
Existing methods for defect inspection of display panels, particularly those affecting input sensors, are inefficient in detecting defects that impact sensor performance.
Innovation Solution
An apparatus and method that involve determining a specific inspection frequency allowing a magnitude of jitter in the input sensor to increase, and setting this frequency to drive the input sensor for defect inspection of the display panel, which includes setting the inspection frequency to a harmonic of the driving frequency of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the input sensor is driven at normal operating frequency, then the sensor performs its intended input sensing function, but defects in the display panel that affect sensor performance cannot be effectively detected
Solution Approach 1:
The inspection is performed before the display panel is assembled with the input sensor, or the sensor is inspected at multiple stages during panel manufacturing. This preliminary inspection allows defects to be detected before they affect final product performance, resolving the contradiction between maintaining normal sensor operation and enabling effective defect detection
Solution Approach 2:
The inspection method dynamically changes the operating frequency of the input sensor to harmonic frequencies of the display panel during inspection, then returns to normal operating frequency for regular use. This dynamic frequency adjustment enables defect detection without permanently altering sensor operation, resolving the contradiction between detection accuracy and ease of operation
2Measurement precision
If the inspection frequency is set to a harmonic frequency of the display panel driving frequency, then defects affecting input sensor performance can be effectively detected through increased jitter magnitude, but this requires deviating from normal sensor operating frequencies
Solution Approach 1:
The system monitors the jitter magnitude of the input sensor at different frequencies and provides feedback to identify frequencies that maximize jitter response. This feedback mechanism automatically determines the optimal harmonic inspection frequency without requiring complex manual tuning, resolving the contradiction between detection sensitivity and process complexity
Solution Approach 2:
The inspection process changes the operating frequency parameter of the input sensor to specific harmonic values of the display panel's driving frequency. By systematically varying this parameter and measuring the corresponding jitter magnitude, the method achieves high defect detection sensitivity while keeping the inspection process manageable through controlled parameter adjustment
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
Effectively detects defects in the display panel that reduce input sensor performance by utilizing the increased jitter magnitude at the specified inspection frequency, allowing for accurate identification of defects such as deposition defects in the display panel's electrodes.
Implementation Method 1
detects the defect of the display panel based on a change in a jitter occurring when the input sensor is driven at the inspection frequency
Data Source
AI summary
Disclosed is an apparatus for inspecting a defect of a display panel. The apparatus for inspecting includes the display panel that displays an image, an input sensor that is disposed on the display panel and senses an input applied from outside, a sensor driving part that drives the input sensor, and an inspection part that is connected with the sensor driving part, sets a frequency of the input sensor to an inspection frequency, and detects the defect of the display panel based on a change in a jitter occurring when the input sensor is driven at the inspection frequency. The inspection frequency includes a harmonic frequency of a driving frequency of the display panel.