KR20100068070A - Method for inspecting liquid crystal display device having multi display panel - Google Patents

Abstract

PURPOSE: A method for inspecting a liquid crystal display device with a multi display panel is provided to standardize a brightness inspection method for a multi display panel and a multi backlight. CONSTITUTION: MxN display panels of a liquid crystal display device(400) display one screen including at least two display panels(410a,410b). Z measurement points are selected for pixel areas(425a,425b) of the respective MxN display panels to measure brightness. The first brightness uniformity and the MxN brightness uniformity about each display panel are calculated based on the measured brightness. The first uniformity and the MxN brightness uniformity are calculated.

Description

Inspection method of liquid crystal display device having multiple display panels {METHOD FOR INSPECTING LIQUID CRYSTAL DISPLAY DEVICE HAVING MULTI DISPLAY PANEL}

The present invention relates to a method for inspecting a liquid crystal display device having multiple display panels, and more particularly, to a liquid crystal display device having multiple display panels for displaying one screen by providing two or more display panels in left and right directions. It relates to a test method for the luminance uniformity.

In today's information society, display is more important as a visual information transmission medium, and in order to gain a major position in the future, it is necessary to satisfy requirements such as low power consumption, thinness, light weight, and high definition.

The display itself has a cathode ray tube (CRT), an electroluminescent (EL), a light emitting diode (LED), a visible fluorescence display (VFD), a field emission The display may be classified into a light emitting type such as a field emission display (FED) and a plasma display panel (PDP), and a non-light emitting type such as a liquid crystal display (LCD).

The liquid crystal display is an apparatus for representing an image by using optical anisotropy of liquid crystal. In addition to the CRT having the excellent visibility and the average power consumption compared to the CRT having the same screen size, the heat generation is also small. It is attracting attention as a display device.

The liquid crystal used in the liquid crystal display device is not a light emitting material that emits light itself, but a light source that modulates the amount of light coming from the outside to display on the screen, so that a separate light source for irradiating light to the liquid crystal display panel In other words, it requires a backlight unit.

Hereinafter, the liquid crystal display device will be described in detail.

Unless otherwise specified, the portion where the lamp is located in the completed liquid crystal display device is referred to as a relatively lower portion, and the portion where the liquid crystal display panel is located is referred to as an upper portion.

A liquid crystal display device is a display panel which largely injects liquid crystal between an array substrate and a color filter substrate to output an image, and is installed under the display panel to emit light over the entire surface of the display panel. The backlight assembly includes a plurality of case parts for fixing and coupling the display panel and the backlight assembly to each other.

As described above, the display panel is largely composed of an array substrate, a color filter substrate, and a liquid crystal layer formed between the array substrate and the color filter substrate.

In general, the manufacturing process of the liquid crystal display device includes a driving element array process for forming a driving element on a lower array substrate, a color filter process for forming a color filter on an upper color filter substrate, a liquid crystal cell process, and a module Process).

The array process may include a plurality of gate lines arranged in one direction at regular intervals on an array substrate, which is a glass substrate, and a plurality of data lines and gate lines arranged at regular intervals in a direction perpendicular to the gate lines; A process of forming a plurality of thin film transistors and pixel electrodes respectively formed in a matrix pixel region defined by a data line is provided.

In addition, the color filter process includes a process of forming a black matrix layer, a color filter layer, and a common electrode on the color filter substrate, which is a glass substrate, to block light reaching portions other than the pixel region. In this case, the common electrode may be formed on the lower glass substrate according to the driving mode of the display panel.

Subsequently, after the alignment film is printed on the array substrate and the color filter substrate, the alignment control force or the surface fixing force (ie, the pretilt angle and orientation direction) on the liquid crystal molecules of the liquid crystal layer formed between the array substrate and the color filter substrate. The alignment film is oriented to provide.

Subsequently, a spacer for maintaining a constant cell gap is formed on the array substrate, and a sealing material is coated on the outer portion of the color filter substrate, and then the pressure is applied to the array substrate and the color filter substrate.

On the other hand, the array substrate and the color filter substrate is composed of a large area mother substrate. In other words, a plurality of panel regions are formed in a large area of the mother substrate, and a thin film transistor and a color filter layer serving as driving elements are formed in each of the panel regions, so that the mother substrate is cut and processed to manufacture a single display panel. must do it. Thereafter, the liquid crystal is injected into the individual display panel processed as described above through the liquid crystal inlet, and the liquid crystal inlet is encapsulated to form a liquid crystal layer.

The polarizing plate is attached to the unit display panel manufactured as described above, and a module process of mounting a driving circuit board and a backlight assembly for driving the display panel is performed to complete a liquid crystal display device.

Here, the inspection process, the inspection to confirm the completeness of the unit process in the manufacturing process of the liquid crystal display device or the measurement of the electrical and optical characteristics of the product contributes to the identification of the cause of the defect and to understand and improve the product characteristics In addition, the inspection and test technology is very important after each unit process because it provides the opportunity to reduce production costs and improve quality.

In particular, the luminance uniformity test for the unit display panel or the backlight is one of the important tests to check whether the luminance uniformity for the entire pixel area of the display panel or the backlight satisfies the criteria required by the buyer.

Recently, according to various needs of a user, a liquid crystal display device having multiple display panels displaying one screen by providing two or more display panels in left, right, and up and down directions has been developed, but according to the luminance inspection of multiple display panels and multiple backlights The method is not standardized.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for inspecting a liquid crystal display device having a multi display panel to standardize a luminance test method for multiple display panels and multiple backlights.

Other objects and features of the present invention will be described in the configuration and claims of the invention described below.

In order to achieve the above object, the inspection method of the liquid crystal display device having a multi-display panel of the present invention is a liquid crystal display having two or more display panels in the left and right or up and down directions to display one screen MxN display panel Preparing the device; Defining a pixel region in which an image is displayed on each of the MxN display panels; Measuring luminance by selecting Z measurement points for each pixel area of the M × N display panels; Calculating first to MxN luminance uniformity for each display panel based on the measured luminances; And comparing luminance values of the display panel with respect to measurement points symmetrically to the left and right or up and down in the MxN display panels, to calculate first luminance uniformity to (MxN) luminance uniformity.

As described above, the inspection method of the liquid crystal display device having the multiple display panel according to the present invention can be actively coped with the needs of the buyer by standardizing the luminance uniformity inspection can be applied to the multiple display panel and multiple backlight.

In addition, display panels and backlights that do not meet the standards have a cost-effective effect by being discarded or reprocessed.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the inspection method of the liquid crystal display device having a multiple display panel according to the present invention.

1 is a flowchart schematically illustrating a method of inspecting a multi-liquid crystal display device according to an exemplary embodiment of the present invention, wherein two or more display panels are provided in left, right, up, down, left, and up and down directions to display a single screen. A method for inspecting luminance uniformity for a liquid crystal display is shown.

As shown in the figure, the inspection method of the liquid crystal display device having a multiple display panel according to the present invention displays left and right (or up and down) display in addition to the first inspection method S1 for inspecting individual luminance uniformity for a single display panel or a backlight. And a second inspection method S2 for inspecting luminance uniformity with respect to the panel or the backlight.

That is, the inspection method of the liquid crystal display device having the multiple display panel according to the present invention includes not only the evaluation of the luminance of the individual display panel or the backlight but also the comparative evaluation of the luminance at the symmetrical points between the display panels. Characterized in that the inspection method of the multiple backlights.

In this case, when the display panel is referred to for convenience of description, the description of the backlight is included in substantially the same manner.

For example, in a liquid crystal display device having multiple display panels provided with two display panels in the left and right directions and displaying one screen, the first inspection method S1 is performed at an arbitrary point for each of the left and right display panels. This is achieved by measuring the luminance value.

After calculating the luminance uniformity using the measured luminance values and the following equations, the luminance uniformity is compared with a preset reference value to determine whether the luminance uniformity satisfies the criteria required by the buyer.

At this time, if the rejection determination is made, the disposal or reprocessing process is performed, and if the acceptance determination is made, the following second inspection method S2 is performed.

The second inspection method S2 calculates a luminance uniformity by comparing luminance values measured at symmetrical points of the left and right display panels, and then compares the luminance uniformity with a preset reference value to determine whether the luminance uniformity satisfies the criteria required by the buyer. You will be judged.

At this time, if the rejection determination is made, the disposal or reprocessing process is performed, and if the acceptance decision is made, the subsequent process is performed.

As described above, luminance values are measured by the first inspection method S1 and the second inspection method S2, and the luminance uniformity calculated by using the luminance values must satisfy the reference value of an individual display panel or a backlight. In addition, the reference value for the point of symmetry between display panels shall be satisfied.

At this time, the order of the first inspection method (S1) and the second inspection method (S2) may be changed in order, and two or more display panels are provided not only left and right, but also in the vertical direction, left and right, up and down direction to display one screen. The present invention is also applicable to a liquid crystal display device having multiple (MxN) display panels.

2 is a perspective view schematically illustrating a structure of an inspection apparatus used in an inspection method of a multiple liquid crystal display according to the present invention.

As shown in the drawings, the inspection apparatus 150 used in the inspection method of the multi-liquid crystal display apparatus according to the present invention includes a stage 151 loaded with the substrate 100 loaded thereon, and configured to be rotatable or movable; The camera 152 is positioned above the loaded substrate 100 and is movably mounted, and a monitor 153 that displays a screen observed by the camera 152.

In this case, the monitor 153 is connected to the camera 152 to display a screen observed by the camera 152, and a predetermined input / output device 156 is provided for input and output operations.

In addition, the inspection apparatus 150 used in the inspection method of the multiple liquid crystal display device according to the present invention is for controlling the camera 152, the monitor 153 and the input and output devices 156, including the stage 151. The controller 154 may further include a calculator (not shown) for calculating luminance uniformity using the measured luminance values.

Hereinafter, an inspection method of the multiple liquid crystal display device according to the present invention using the inspection device configured as described above will be described by way of example.

FIG. 3 is a plan view illustrating an inspection method of a multiple liquid crystal display according to a first exemplary embodiment of the present invention. FIG. 3 is a liquid crystal display having two display panels provided with two display panels in left and right directions and displaying one screen. The apparatus is shown as an example.

As shown in the drawing, the multiple liquid crystal display device 100 according to the first embodiment of the present invention includes a first display panel 110a positioned at the left side and a second display panel 110b positioned at the right side. The first and second display panels 110a and 110b are largely composed of an array substrate, a color filter substrate, and a liquid crystal layer formed between the array substrate and the color filter substrate.

The first display panel 110a and the second display panel 110b each include a first pixel region 125a and a second pixel region 125b on which an image is displayed.

In this case, the multiple liquid crystal display device 100 according to the first exemplary embodiment of the present invention may include a first pixel area 125a of the first display panel 110a and a second pixel area of the second display panel 110b. The case where 125b) has the magnitudes of H and V in the horizontal and vertical directions, respectively, is shown as an example.

For the luminance measurement, A1 to I1 and A2 to I2 of each of the first pixel area 125a of the first display panel 110a and the second pixel area 125b of the second display panel 110b are measured. Although a case of selecting a total of nine measurement points is given as an example, the present invention is not limited thereto, and the luminance may be measured by selecting a plurality of measurement points, such as one, seventeen, or twenty five, respectively.

As described above, in the case of measuring luminance by selecting nine measurement points, A1 and A2 select centers of the first pixel area 125a and the second pixel area 125b, and B1, B2, and D1 and D2, respectively, An edge portion separated by H / 12 from the left and right sides of the first pixel region 125a and the second pixel region 125b and separated by V / 12 from the upper side is selected.

Further, C1 and C2 select left and right center portions separated by V / 12 from the upper side of the first pixel region 125a and the second pixel region 125b, respectively.

Further, E1, E2, F1, and F2 select upper and lower center portions separated by H / 12 from the left and right sides of the first pixel region 125a and the second pixel region 125b, respectively.

In addition, G1, G2, and I1 and I2 select edge portions that are separated by H / 12 from the left and the right of the first pixel region 125a and the second pixel region 125b, and are separated by V / 12 from the lower side, respectively.

In addition, H1 and H2 select left and right central portions separated by V / 12 from the lower side of the first pixel region 125a and the second pixel region 125b, respectively.

In this case, the measuring points A2 to I2 of the second pixel area 125b are applied to the first pixel area 125a to compare and measure the luminance between the left and right first display panel 110a and the second display panel 110b. It characterized in that it has a position symmetrical to the left and right with respect to the selected measuring point A1 to I1.

However, the present invention is not limited to the numerical values such as the position and number of the measurement points described above, and the numerical values described above are just one example, and the present invention provides the left and right first display panel 110a and the second display panel ( Applicable as long as the measurement points A2 to I2 of the second pixel region 125b are symmetrical with respect to the measurement points A1 to I1 selected in the first pixel region 125a to compare and measure the luminance between 110b). Do.

FIG. 4 is a plan view illustrating a method of inspecting a multiple liquid crystal display according to a second exemplary embodiment of the present invention, wherein two display panels are provided in a vertical direction to display a 1 × 2 display panel displaying one screen. The liquid crystal display device which has is shown, for example.

As shown in the figure, the multiple liquid crystal display 200 according to the second embodiment of the present invention includes a first display panel 210a positioned at an upper portion and a second display panel 210b disposed at a lower portion thereof. The first and second display panels 210a and 210b are largely composed of an array substrate, a color filter substrate, and a liquid crystal layer formed between the array substrate and the color filter substrate.

The first display panel 210a and the second display panel 210b each include a first pixel area 225a and a second pixel area 225b on which an image is displayed.

In this case, the multiple liquid crystal display device 200 according to the second exemplary embodiment of the present invention may include a first pixel area 225a of the first display panel 210a and a second pixel area of the second display panel 210b. The case where 225b) has the magnitudes of V and H in the horizontal and vertical directions, respectively, is shown as an example.

In the case where luminance is measured by selecting nine measurement points, A1 and A2 select centers of the first pixel region 225a and the second pixel region 225b, and B1, B2, and D1 and D2, respectively, The corner portions separated by V / 12 from the left and right sides of the first pixel region 225a and the second pixel region 225b and separated by H / 12 from the upper and lower sides are selected.

In addition, C1 and C2 select left and right center portions separated by H / 12 from the upper and lower sides of the first pixel region 225a and the second pixel region 225b, respectively.

Further, E1, E2, F1, and F2 select upper and lower center portions separated by V / 12 from the left and right sides of the first pixel region 225a and the second pixel region 225b, respectively.

In addition, G1, G2, and I1 and I2 select edge portions that are separated by V / 12 from the left and the right of the first pixel region 225a and the second pixel region 225b, and are separated by H / 12 from the upper side, respectively. .

In addition, H1 and H2 select left and right center portions separated by H / 12 from above and below the first pixel region 225a and the second pixel region 225b, respectively.

In this case, the measuring points A2 to I2 of the second pixel area 225b may be applied to the first pixel area 225a to compare and measure the luminance between the upper and lower first display panels 210a and the second display panel 210b. It characterized in that it has a position that is symmetrical up and down with respect to the selected measuring point A1 ~ I1.

Meanwhile, in the liquid crystal display device having the 2 × 1 display panels and the liquid crystal display device having the 1 × 2 display panels illustrated in FIGS. 3 and 4, the first and second display panels 110a and 210a and 110b are respectively separated. , 210b), the first luminance uniformity and the second luminance uniformity according to the luminance measurement are calculated through Equations 1 and 2, respectively.

As such, the first luminance uniformity and the second luminance uniformity are displayed as a ratio of the maximum value and the minimum value among the luminance values measured in the first display panels 110a and 210a and the second display panels 110b and 210b. Can be.

In addition, the third luminance uniformity and the fourth luminance uniformity for comparing and measuring the luminance between the left and right upper and lower first display panels 110a and 210a and the second display panels 110b and 210b are expressed by Equations 3 and 4 below. Is calculated.

As such, the third luminance uniformity represents a ratio of luminance values at measurement points that are symmetrical between the left and right first display panels 110a and 210a and the second display panels 110b and 210b, and the fourth luminance uniformity is the first luminance uniformity. And the ratio of the second luminance uniformity.

FIG. 5 is a plan view illustrating an inspection method of a multi-liquid crystal display device according to a third exemplary embodiment of the present invention, wherein two display panels are provided in up, down, left, and right directions to display one screen and have 2 × 2 display panels. The liquid crystal display device is shown as an example.

As shown in the drawing, the multiple liquid crystal display 300 according to the third exemplary embodiment of the present invention may include a first display panel 310a positioned at the left side and an upper side, and a second display panel positioned at the right side and the upper side. 310b) and a third display panel 310c positioned at the left side and a lower side, and a fourth display panel 310d positioned at the right side and the lower side, and the first display panel 310a to the fourth display panel 310d. Is largely composed of an array substrate and a color filter substrate and a liquid crystal layer formed between the array substrate and the color filter substrate.

The first display panel 310a to the fourth display panel 310d each include a first pixel area 325a to a fourth pixel area 325d on which an image is displayed.

In this case, the multiple liquid crystal display 300 according to the third exemplary embodiment of the present invention may include the first pixel region 325a of the first display panel 310a to the fourth pixel region of the fourth display panel 310d. The case where 325d) has the magnitudes of H and V in the horizontal and vertical directions, respectively, is shown as an example.

In addition, the first pixel area 325a of the first display panel 310a and the second pixel area 325b of the second display panel 310b and the third display panel 310c of the third display panel 310c are used to measure luminance. A total of nine measurement points of A1 to I1 and A2 to I2 and A3 to I3 and A4 to I4 are selected for each of the three pixel areas 325c and the fourth pixel areas 325d of the fourth display panel 310d. Although the case is taken as an example, the present invention is not limited thereto, and the luminance may be measured by selecting a plurality of measurement points such as one, seventeen, or twenty five, respectively.

As described above, in the case of measuring luminance by selecting nine measurement points, A1 and A2 select centers of the first pixel region 325a and the second pixel region 325b, and B1, B2, and D1 and D2, respectively, An edge portion separated by H / 12 from the left and right sides of the first pixel region 325a and the second pixel region 325b and separated by V / 12 from the upper side is selected.

In addition, C1 and C2 select left and right center portions separated by V / 12 from the upper side of the first pixel region 325a and the second pixel region 325b, respectively.

Further, E1, E2, F1, and F2 select upper and lower center portions separated by H / 12 from the left and right sides of the first pixel region 325a and the second pixel region 325b, respectively.

In addition, G1 and G2 and I1 and I2 select edge portions that are separated by H / 12 from the left and right sides of the first pixel region 325a and the second pixel region 325b, and are separated by V / 12 from the lower side, respectively.

In addition, H1 and H2 select left and right central portions separated by V / 12 from the lower side of the first pixel region 325a and the second pixel region 325b, respectively.

In the same manner, A3 and A4 select centers of the third pixel region 325c and the fourth pixel region 325d, and B3, B4, D3 and D4 respectively select the third pixel region 325c and the fourth pixel region. An edge portion separated by the left and right of 325d by H / 12 and V / 12 from the upper side is selected.

Further, C1 and C2 select left and right central portions separated by V / 12 from the upper side of the third pixel region 325c and the fourth pixel region 325d, respectively.

Further, E1, E2, F1, and F2 select upper and lower center portions separated by H / 12 from the left and right sides of the third pixel region 325c and the fourth pixel region 325d, respectively.

In addition, G1, G2, and I1 and I2 select edges that are separated by H / 12 from the left and the right of the third pixel region 325c and the fourth pixel region 325d, and are separated by V / 12 from the lower side, respectively.

Further, H1 and H2 select left and right central portions separated by V / 12 from the bottom of the third pixel region 325c and the fourth pixel region 325d, respectively.

In this case, the measurement points A2 to I2 and A4 to I4 of the second pixel area 325b and the fourth pixel area 325d are displayed on the left and right first display panel 310a, the second display panel 310b, and the third display. Measurement points A1 to I1 and A3 to I3 selected in the first pixel area 325a and the third pixel area 325c to compare and measure the luminance between the panel 310c and the fourth display panel 310d, respectively. It is characterized by having a symmetrical position.

In addition, the measuring points A3 to I3 and A4 to I4 of the third pixel area 325c and the fourth pixel area 325d are respectively disposed on the upper and lower first display panels 310a, the third display panels 310c, and the second display. Up and down for the measurement points A1 to I1 and A2 to I2 selected in the first pixel area 325a and the second pixel area 325b to compare and measure the luminance between the panel 310b and the fourth display panel 310d. It is characterized by having a position symmetrical to.

Meanwhile, in the liquid crystal display device having the 2 × 2 display panels illustrated in FIG. 5, the first to fourth luminance uniformity to the fourth luminance according to the luminance measurement of the individual first display panels 310a to the fourth display panel 310d. Uniformity is calculated through the following equations 5 to 8, respectively.

As such, the first luminance uniformity to the second luminance uniformity may be displayed as a ratio between the maximum value and the minimum value among the luminance values measured in each of the first display panel 310a to the fourth display panel 310d.

In addition, the fifth to eighth luminance uniformity for comparing and measuring the luminance between the left and right upper and lower first display panels 310a to the fourth display panel 310d are calculated by the following equations (9) to (12).

As described above, the fifth luminance uniformity represents a ratio of luminance values at measurement points that are symmetrical between the left and right first display panel 310a and the second display panel 310b, and the sixth luminance uniformity is the upper and lower first display panels 310a. And the ratio of the luminance value at the measurement points symmetrical between the third display panel 310c and the third display panel 310c.

In addition, the seventh luminance uniformity represents a ratio of luminance values at measurement points that are symmetrical between the top, bottom, left and right first display panels 310a and the fourth display panels 310d, and the eighth luminance uniformity is the first luminance uniformity and the first. The ratio of 2 luminance uniformity to 4th luminance uniformity is shown.

FIG. 6 is a plan view illustrating an inspection method of a multiple liquid crystal display according to a fourth exemplary embodiment of the present invention, for example, in which a total of 17 measurement points are selected to measure luminance.

In this case, the multiple liquid crystal display according to the fourth embodiment of the present invention is the same as the multiple liquid crystal display according to the first embodiment of the present invention, which is provided with two display panels in left and right directions to display one screen. The liquid crystal display device which has a display panel is shown, for example.

As shown in the figure, the multiple liquid crystal display device 400 according to the fourth embodiment of the present invention includes a first display panel 410a positioned on the left side and a second display panel 410b positioned on the right side. The first and second display panels 410a and 410b are largely composed of an array substrate, a color filter substrate, and a liquid crystal layer formed between the array substrate and the color filter substrate.

The first display panel 410a and the second display panel 410b each include a first pixel area 425a and a second pixel area 425b on which an image is displayed.

In this case, the multiple liquid crystal display 400 according to the fourth exemplary embodiment of the present invention may include a first pixel area 425a of the first display panel 410a and a second pixel area of the second display panel 410b. For example, 425b) has the magnitudes of H and V in the horizontal and vertical directions, for example.

In addition, a total of 17 measurement points of 1 to 17 are measured for the first pixel area 425a of the first display panel 410a and the second pixel area 425b of the second display panel 410b to measure luminance. For example, select.

7A and 7B are tables showing a result of measuring luminance uniformity of left and right display panels in the method of inspecting the multiple liquid crystal display shown in FIG. 6, wherein the unit is nit.

Referring to the drawings, the first luminance uniformity of the first pixel region 425a of the left first display panel 410a is 1.27, and the first luminance uniformity of the second pixel region 425b of the right second display panel 410b is shown. It can be seen that the luminance uniformity is 1.33.

Further, the third luminance uniformity, which is the ratio of the luminance values at the measurement points that are symmetrical between the left and right first display panels 410a and the second display panels 410b, is, for example, about 90.92% at the measurement points 17. It can be seen that the fourth luminance uniformity, which is the ratio of the first luminance uniformity and the second luminance uniformity, is about 95.49%.

8A and 8B are tables showing the results of measuring luminance uniformity of the left and right backlights in the inspection method of the multiple liquid crystal display shown in FIG. 6, and the unit is cd / m ² .

Referring to the drawings, the first luminance uniformity of the backlight with respect to the first pixel region 425a of the left first display panel 410a is 1.23, and is equal to the second pixel region 425b of the right second display panel 410b. It can be seen that the second luminance uniformity of the backlight is about 1.267.

Further, the third luminance uniformity of the backlight, which is the ratio of the luminance values at the measurement points symmetrical between the left and right first display panels 410a and the second display panels 410b, is, for example, about 96.55% at the measurement points 17, It can be seen that the fourth luminance uniformity, which is the ratio of the first luminance uniformity and the second luminance uniformity, is about 97.08%.

The first to fourth luminance uniformity values calculated as described above are compared with the reference values required by the buyer, and a pass or fail determination is made.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

1 is a flow chart schematically showing a method of inspecting a multiple liquid crystal display according to the present invention.

2 is a perspective view schematically showing the structure of an inspection apparatus used in the inspection method of the multiple liquid crystal display according to the present invention;

3 is a plan view for explaining a method of inspecting a multiple liquid crystal display according to a first embodiment of the present invention;

4 is a plan view for explaining a test method of a multiple liquid crystal display according to a second exemplary embodiment of the present invention.

5 is a plan view for explaining a method of inspecting a multiple liquid crystal display according to a third exemplary embodiment of the present invention.

FIG. 6 is a plan view illustrating an inspection method of a multiple liquid crystal display according to a fourth exemplary embodiment of the present invention. FIG.

7A and 7B are tables showing results of measuring luminance uniformity of left and right display panels in the inspection method of the multiple liquid crystal display shown in FIG.

8A and 8B are tables showing results of measuring luminance uniformity of the left and right backlights in the inspection method of the multiple liquid crystal display shown in FIG.

DESCRIPTION OF REFERENCE NUMERALS

100 to 400: multiple liquid crystal display 110a to 410a: first display panel

110b to 410b: second display panel 125a to 425a: first pixel area

125b to 425b: second pixel area 310c: third display panel

310d: fourth display panel 325c: third pixel region

325d: fourth pixel region

Claims (15)

Preparing a liquid crystal display device having MxN display panels, each of which has two or more display panels arranged in left and right directions and displaying one screen; Defining a pixel region in which an image is displayed on each of the MxN display panels; Measuring luminance by selecting Z measurement points for each pixel area of the M × N display panels; Calculating first to MxN luminance uniformity for each display panel based on the measured luminances; And Comparing the luminance values of the display panel with respect to measurement points that are symmetrically to the left and right or up and down in the MxN display panels, and calculating a first luminance uniformity to an MxN luminance uniformity. Inspection method of having a liquid crystal display device. The method of claim 1, wherein the Z measurement points comprise 1, 9, 17, or 25 measurement points in total. The method of claim 1, further comprising comparing the calculated first luminance uniformity to MxN luminance uniformity values with preset reference values. The liquid crystal display of claim 1, further comprising comparing the calculated first 'luminance uniformity to (MxN)' luminance uniformity values with preset reference values. method of inspection. The multiplicity of claim 1, wherein the first to MxN luminance uniformity is calculated as a ratio between a maximum value and a minimum value among luminance values measured for each of the first to MxN display panels. An inspection method of a liquid crystal display device having a display panel. The display panel of claim 1, wherein the first uniformity of the luminance uniformity to the (MxN-1) luminance uniformity of the first display panel and the second display panel are symmetrical from left to right or up and down. An inspection method for a liquid crystal display device having a multiple display panel, characterized in that it is calculated as a ratio of luminance values at measurement points that are symmetrical to each other. 6. The method of claim 5, wherein the (MxN) 'luminance uniformity is calculated as a ratio between the first luminance uniformity and the second luminance uniformity to the MxN luminance uniformity. 2. The liquid crystal display device according to claim 1, further comprising: a 2x1 display panel provided with a first display panel and a second display panel in left and right directions to display one screen; When the second pixel area of the second display panel has H and V sizes in the horizontal and vertical directions, respectively, A1 for each of the first pixel area of the first display panel and the second pixel area of the second display panel. 9. A method for inspecting a liquid crystal display device having a multiple display panel, wherein a total of nine measurement points, i.e., I1 and A2 to I2 are selected. 9. The method of claim 8, wherein A1 and A2 select centers of the first pixel area and the second pixel area, and B1, B2, D1, and D2 are H from the left and the right of the first pixel area and the second pixel area, respectively. And a corner portion separated by / 12 and separated by V / 12 from the upper side. 9. The method of claim 8, wherein C1 and C2 select left and right central portions separated by V / 12 from an upper side of the first pixel region and the second pixel region, respectively, and E1, E2, F1, and F2 respectively represent a first pixel region and a first pixel region. And an upper and lower center portions separated by H / 12 from the left and right sides of the second pixel region, wherein the liquid crystal display device having a multiple display panel is selected. The method of claim 8, wherein the G1 and the G2 and the I1 and I2 are selected by the edge portion of the first pixel region and the second pixel region separated by H / 12 from the left and right, and V / 12 from the lower side, respectively, And H2 respectively select left and right center portions separated by V / 12 from the lower side of the first pixel region and the second pixel region, respectively. The method of claim 8, wherein the measurement points A2 to I2 of the second pixel area are measured at the measurement points A1 to I1 selected in the first pixel area to compare and measure luminance between the left and right first and second display panels. An inspection method of a liquid crystal display device having a multiple display panel, characterized in that it has a position symmetrically with respect to the left and right. The method of claim 8, wherein the first luminance uniformity and the second luminance uniformity according to the luminance measurement of the respective first and second display panels are determined.

Inspection method of a liquid crystal display device having a multiple display panel, characterized in that calculated through. The method of claim 8, wherein the third luminance uniformity and the fourth luminance uniformity for comparing and measuring the luminance between the left and right first and second display panels are

Inspection method of a liquid crystal display device having a multiple display panel, characterized in that calculated through. 2. The method of claim 1, wherein the luminance uniformity of the backlight is inspected in the liquid crystal display device having the MxN display panels.

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