JPH02234191A - Liquid crystal panel inspecting device - Google Patents

Abstract

PURPOSE:To prevent the inaccuracy of an inspection executed by a person's help with regard to a D-D defect, and also, to curtail the manhour for the inspection by providing a mask circuit for enlarging and reducing image data binarized by a binarizing circuit and a measuring circuit for measuring an area of the image data and coordinate values of X and Y. CONSTITUTION:A signal (a) which becomes a semi-lighting state is sent through a driving circuit 10, an image of a display state of a liquid crystal panel (LCD panel) 12 which becomes a semi-lighting state is brought to image pickup by a color camera 1, and the number of bits determined by a control part 7 is added or deleted to or from binary image data which is binarized in a mask circuit 5. Subsequently, an area of the image data, and the minimum value and the maximum value of coordinates in the (x) direction and the (y) direction are measured by a measuring circuit 6, the image data whose area exceeds some prescribed value, and also, whose length in the (y) direction exceeds a prescribed value is extracted by the control part 7, a defect in the (y) direction of a defect (D-D defect) which appears at the time of semi-lighting is detected, and a defect in the (x) direction is detected by changing the coordinates of (x) and (y). In such a way, the inspection is executed exactly, and also, the manhour for the inspection can be curtailed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal panel (hereinafter referred to as rLCD panel) inspection device, and particularly to an LCD panel inspection device for detecting comb-shaped lighting on an LCD panel. [Prior Art] A defect (hereinafter referred to as D-D) that appears when a conventional LCD panel is lit in a comb pattern (hereinafter referred to as half-lighting with a driving signal applied to every other drain line on both sides of the LCD panel). (referred to as defects) are inspected for drive circuits, backlights, and
It is made into an oval shape including a CD panel fixing jig. Next, a detailed explanation will be given with reference to the drawings. FIG. 4 is an explanatory diagram showing a conventional inspection method. LCD panel 41,
Set it on the LCD panel fixing jig 42, and attach the backlight 4.
4, the drive circuit 43 is manually set to a half-lighting drive signal value, the light from the backlight 44 is transmitted through the liquid crystal layer of the LCD panel 41, and the display state of the LCD panel 41 is inspected by performing a physical inspection. Ta. [Problems to be Solved by the Invention] The conventional LCD panel inspection method described above lacks accuracy because it is inspected with the naked eye, and the inspection results vary depending on the person conducting the inspection. In addition, there was a drawback that the inspection was performed manually, which required a lot of inspection man-hours.

[Means to solve the problem]

The LCD panel inspection device of the present invention includes a color camera for inputting an image, an input circuit for converting the input color image information into a digital signal, and an input circuit for converting the color image information converted into a digital signal into three colors of red, green, and blue. An image memory that stores images by color, a binarization circuit that binarizes using a pre-specified threshold, and a mask circuit that adds or deletes a pre-specified number of bits to the binarized image data. , the minimum value of the area and coordinates in the X direction (horizontal direction) of the image data added/deleted by the mask circuit. Maximum value,
Minimum value of the coordinate in the y direction (vertical direction). A measurement circuit that measures the maximum value of M, a backlight that irradiates light that passes through the liquid crystal layer of the liquid crystal panel, a device that determines the transmittance of light to the liquid crystal layer of the liquid crystal panel, and a drain line that is located above and below the liquid crystal panel. A drive circuit that can give a drive signal to each wire, a control section that controls the human power circuit, the binarization circuit, the mask circuit, the measurement circuit, and the drive circuit, and a display that displays test results. It consists of the following parts. [Example] Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The LCD panel inspection apparatus shown in FIG. 1 includes a color camera 1 for inputting an image, an input circuit 2 for converting the input color image information into a digital signal, and a R - An image memory 3 that stores the three colors of G and H, a binarization circuit 4 that binarizes the binarized image data using a certain appropriate threshold value, and a predetermined memory for the binarized image data. A mask circuit 5 that adds or deletes the number of bits, the area of the enlarged/reduced image data, the minimum and maximum values of the coordinates in the X direction (horizontal direction), and the minimum and maximum values of the coordinates in the y direction (vertical direction) A measurement circuit 6 for measuring the value, an ILcD panel fixing jig 11 for fixing the LCD panel 12, a backlight 9 for transmitting light to the liquid crystal layer of the LCD panel 12, and a backlight for the liquid crystal layer of the LCD panel. Drive circuit 1 that determines the light transmittance of step 9
0, the input circuit 2, the binarization circuit 4, the measurement circuit 6,
It is configured to include a control section 7 that controls the drive circuit 10, and a display section 8 that displays the test results. Here, in the LCD panel 12, the control unit 7 sends a signal a to the LCD panel 12 through the drive circuit 10, which causes the LCD panel 12 to be in a half-lighted state.
The part where the half-lit β is displayed will be displayed. An image of the display state of the LCD panel 12 is captured by a color camera 1,
The output signal is converted into an RGB digital signal by an input circuit 2 and stored in an image memory 3 as image data. In the binarization circuit 4, the data is binarized based on the value determined by the control unit 7. Figure 2 is a binarized image of the LCD panel in a half-lit state. When this binary image data is added to or deleted from the image in the mask circuit 5 using the number of bits determined by the control unit 7, the image data with the D-D defect is removed from the third
As shown in the figure, the image data is connected in the vertical direction.

Here, the measurement circuit 6 calculates the area of the image data, the minimum value and maximum value of the coordinate in the X direction, and the minimum value of the coordinate in the y direction. A D-D defect can be detected by measuring the maximum value and extracting image data of a defect having an area of a certain value or more and a length in the y direction (maximum value - minimum value) of a certain value or more by the control unit 7. The extraction results of the control unit 7 are then displayed on the display unit 8. In the above, a defect in the y direction was found, but a defect in the X direction is X and y
You can perform the same method by replacing the coordinates of . [Effects of the Invention] The LCD panel inspection device of the present invention includes a binarization circuit, a mask circuit for enlarging/reducing the image data binarized by the binarization circuit, and a mask circuit for enlarging and reducing the image data area and X, Y. By providing a measurement circuit that measures coordinate values, the LCD panel's D-
Since the inspection for D defects can be done automatically, it has the effect of reducing the inaccuracy of manual inspection and reducing the number of inspection man-hours.

Molly, 4... Binarization circuit, 5... Mask circuit, 6
...Measuring circuit, 7...Control section, 8...Display section, 9
...Backlight, 10...Drive circuit, 11...
LCD panel fixing jig, 12...LCD panel.

Claims (1)

[Claims] A color camera for inputting images, an input circuit that converts the input color image information into digital signals, and an image that stores the color image information converted to digital signals in three colors: red, green, and blue. A memory, a binarization circuit that binarizes with a pre-specified threshold, a mask circuit that adds or deletes a pre-specified number of bits to the binarized image data, and the mask circuit adds or deletes bits. A measurement circuit that measures the area of the image data, the minimum and maximum values of the x-direction (horizontal direction) coordinates, and the minimum and maximum values of the y-direction (vertical direction) coordinates, and the measurement circuit that measures the area of the image data transmitted through the liquid crystal layer of the liquid crystal panel. a backlight that irradiates light, a drive circuit that can determine the transmittance of light to the liquid crystal layer of the liquid crystal panel and apply a drive signal to each drain line above and below the liquid crystal panel, and the input A liquid crystal panel inspection device comprising: a control section that controls a circuit, the binarization circuit, the mask circuit, the measurement circuit, and the drive circuit; and a display section that displays inspection results.