Ultra-small sensor module for display panel inspection

Abstract

The ultra-small sensor module for inspecting display panels includes an overvoltage protection circuit that protects the circuit module from external overvoltage, a DC voltage conversion circuit that converts the voltage into a driving voltage within the module, a limit signal detection circuit that detects a limit sensor signal using an ultra-small optical switch, a sensor signal processing circuit that converts the limit sensor signal detected by the limit signal detection circuit into a digital signal, and a defect determination unit that determines a defect in the display panel based on the limit sensor signal converted by the sensor signal processing circuit. The overvoltage protection circuit, the DC voltage conversion circuit, the limit signal detection circuit, the sensor signal processing circuit, and the defect determination unit are integrally arranged on an internally mounted main board.

Description

Technology Field

[0001] The present invention relates to a micro-sensor module for display panel inspection, and more specifically, to a micro-sensor module for display panel inspection that detects defects in a display panel. Background Technology

[0003] Display panels, such as organic light-emitting display devices, may have various types of defects during manufacturing, and foreign substances, smudges (stains), surface scratches, bubbles, etc., on the display panel can adversely affect the performance of the display, so they must be thoroughly detected and removed through pre-inspection.

[0004] In particular, if defects in OLED panels are not detected in advance and display devices are manufactured using them, defects will occur, causing significant losses; therefore, it is crucial to detect defects in OLED panels before the completion of display device production.

[0005] General inspection methods for display panels mainly utilize vision inspection, which evaluates the image quality of the product during the display manufacturing process to determine whether there are defects, and electrical inspection, which drives the OLED panel substrate (a glass plate on which a large number of panels with only circuits mounted on it are arranged) at the pixel level using electrical signals.

[0006] However, devices for inspecting these display panels are vulnerable to external overvoltage, which can lead to device failure. Furthermore, previously, sensor modules were not miniaturized, and sensors were mounted externally rather than internally. Although the goal was to minimize the size of cleanroom equipment while diversifying its functions to maximize performance within the minimum space, this was not achieved. The problem to be solved

[0008] Therefore, the objective of the present invention is to provide a micro-sensor module for inspecting a display panel that is formed as an internally mounted type and can be protected against external overvoltage. means of solving the problem

[0010] A micro-sensor module for inspecting a display panel having a protection function against shock voltage according to one embodiment of the present invention may include: a noise filter that reduces noise of an incoming current from the outside; an overvoltage protection circuit that receives the incoming current with reduced noise from the noise filter and removes external overvoltage; a DC voltage conversion circuit that receives 24VDC from the overvoltage protection circuit and converts it into 5VDC, which is the driving voltage within the module; a limit signal detection circuit that receives current from the DC voltage conversion circuit and detects a limit sensor signal using a micro-optical switch; a sensor signal processing circuit that converts the limit sensor signal detected by the limit signal detection circuit into a digital signal, analyzes it, and graphs it; and a defect determination unit that determines a defect in the display panel based on the limit sensor signal converted by the sensor signal processing circuit. The overvoltage protection circuit, the DC voltage conversion circuit, the limit signal detection circuit, the sensor signal processing circuit, and the defect determination circuit may be integrally arranged on an internally mounted main board. It may include a motor power supply function, an overvoltage protection function, an encoder signal detection transmission function, and a sensor detection function.

[0011] delete

[0012] delete Effects of the invention

[0014] According to the present invention, all internal components of the sensor module are integrally formed on the main board, and the main board is internally mounted so that it can be miniaturized, and the durability can be improved by compensating for parts vulnerable to external overvoltage through the overvoltage protection circuit.

[0015] In addition, since various functions are equipped, the inspection of display panels can be facilitated by utilizing these functions, and the accuracy of defect judgment of display panels can be improved. Brief explanation of the drawing

[0017] FIG. 1 is a configuration diagram of a micro-sensor module for display panel inspection according to the present invention. Figure 2 is a circuit diagram of the sensor module and a graph of the detected limit sensor signal. FIG. 3 is a circuit diagram of a first embodiment of a micro-sensor module for display panel inspection. FIG. 4 is a circuit diagram of a second embodiment of a micro-sensor module for display panel inspection. FIG. 5 is a circuit diagram of a third embodiment of a micro-sensor module for display panel inspection. Specific details for implementing the invention

[0018] Hereinafter, a miniature sensor module (1) for inspecting a display panel according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0019] FIG. 1 is a configuration diagram of a micro-sensor module (1) for inspecting a display panel according to the present invention, FIG. 2 is a circuit diagram of the sensor module (1) and a graph of the detected limit sensor signal, FIG. 3 is a circuit diagram of a first embodiment of a micro-sensor module (1) for inspecting a display panel, FIG. 4 is a circuit diagram of a second embodiment of a micro-sensor module (1) for inspecting a display panel, and FIG. 5 is a circuit diagram of a third embodiment of a micro-sensor module (1) for inspecting a display panel.

[0020] The configuration of a miniature sensor module (1) for display panel inspection is explained with reference to FIGS. 1 to 5.

[0021] The ultra-small sensor module (1) for inspecting display panels includes an overvoltage protection circuit (10), a DC voltage conversion circuit (20), a limit signal detection circuit (30), a sensor signal processing circuit (40), a noise filter (50), and a defect judgment unit (60).

[0022] The overvoltage protection circuit (10) is configured to protect the circuit module from external overvoltage.

[0023] The DC voltage conversion circuit (20) is a DC-DC converter that converts the input 24VDC into the module's driving voltage (5VDC).

[0024] The limit signal detection circuit (30) detects the limit sensor signal using a miniature optical switch.

[0025] The sensor signal processing circuit (40) converts the limit sensor signal detected by the limit signal detection circuit (30) into a digital signal.

[0026] The noise filter (50) reduces the noise of the incoming current from the outside.

[0027] The defect determination unit (60) determines the defect of the display panel based on the limit sensor signal converted by the sensor signal processing circuit unit (40).

[0028] Here, the overvoltage protection circuit (10), DC voltage conversion circuit (20), limit signal detection circuit (30), sensor signal processing circuit (40), and defect determination unit (50) of the ultra-small sensor module (1) for display panel inspection are integrally arranged on the internally mounted main board. By doing so, it can be implemented as an externally mounted type rather than an internally mounted type.

[0029] The ultra-small sensor module (1) for display panel inspection has functions including a motor power supply function, an overvoltage protection function, an encoder signal detection transmission function, and a sensor detection function.

[0030] FIG. 1 is a configuration diagram of a micro-sensor module (1) for inspecting a display panel according to the present invention.

[0031] The noise filter (50) reduces the noise of the input current entering from the outside and directs it to the overvoltage protection circuit (10), and the overvoltage protection circuit (10) removes the external overvoltage and transmits 24VDC to the DC voltage conversion circuit (20). The DC voltage conversion circuit (20) converts the input 24VDC into a driving voltage (5VDC) within the module and transmits the current to the limit signal detection circuit (30), and the limit signal detection circuit (30) detects the limit sensor signal using a miniature optical switch. The sensor signal processing circuit (40) converts the limit sensor signal detected by the limit signal detection circuit (30) into a digital signal. The limit sensor signal converted by the sensor signal processing circuit (40) is analyzed and graphed, and based on this, a defect in the display panel is determined.

[0032] Due to the above-described ultra-small sensor module (1) for inspecting display panels, all internal components of the sensor module are formed integrally on the main board, and the main board can be miniaturized by being internally mounted, and durability can be improved by compensating for parts vulnerable to external overvoltage through the overvoltage protection circuit.

[0033] In addition, since various functions are equipped, the inspection of the display panel can be facilitated by utilizing these functions, and the accuracy of defect judgment of the display panel can be improved. Explanation of the symbols

[0035] 1: Ultra-small sensor module for display panel inspection 10: Overvoltage protection circuit section 20: DC voltage conversion circuit section 30: Limit signal detection circuit section 40: Sensor signal processing circuit 50: Noise filter 60: Defect Determination Unit

Claims

Claim 1 A noise filter that reduces noise in the input current entering from the outside; an overvoltage protection circuit that receives the input current with noise reduced by the noise filter and removes external overvoltage; a DC voltage conversion circuit that receives 24VDC from the overvoltage protection circuit and converts it to 5VDC, which is the driving voltage within the module; a limit signal detection circuit that receives current from the DC voltage conversion circuit and detects a limit sensor signal using a miniature optical switch; and a sensor signal processing circuit that converts the limit sensor signal detected by the limit signal detection circuit into a digital signal, analyzes it, and graphs it. A miniature sensor module for inspecting a display panel having a protection function against shock voltage, comprising a defect determination unit that determines a defect in the display panel based on a limit sensor signal converted by the sensor signal processing circuit unit, wherein the overvoltage protection circuit unit, the DC voltage conversion circuit unit, the limit signal detection circuit unit, the sensor signal processing circuit unit, and the defect determination unit are integrally arranged on an internally mounted main board, and are characterized by including a motor power supply function, an overvoltage protection function, an encoder signal detection transmission function, and a sensor detection function. Claim 2 delete Claim 3 delete

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