KR102037053B1 - Display panel - Google Patents

Abstract

The present invention provides a display device comprising: a substrate divided into a display area in which an image is displayed and a non-display area surrounding the display area; A gate wiring and a data wiring formed on the substrate and crossing each other; A plurality of pixels formed in a matrix in the display area by the gate lines and the data lines; A first auto probe pad formed in the non-display area and connected to a portion of 2n pixels of one horizontal pixel line through the data line; And a second auto probe pad spaced apart from the first auto probe pad and formed in the non-display area, the second auto probe pad being connected to the other of the 2n pixels of the one horizontal pixel line through the data line. do.

Description

Display panel

The present invention relates to a display panel, and more particularly, to a display panel for dividing and inspecting a test image from a display panel before modularization.

In recent years, as the society enters a full-scale information age, a display field for processing and displaying a large amount of information has been rapidly developed, and various various flat panel display devices have been developed and are in the spotlight.

Specific examples of such a flat panel display include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting diode display (OLED), and the like. For example, these flat panel displays are rapidly replacing conventional cathode ray tubes (CRTs) because of their excellent performance of thinning, light weight, and low power consumption.

Among them, liquid crystal displays have high contrast ratios, are suitable for moving image display, and have low power consumption, and are used in various fields such as notebooks, monitors, and TVs. As it is known, the liquid crystal has a thin, long molecular structure, optical anisotropy having an orientation in an array, and polarization in which the direction of molecular arrangement changes depending on its size when placed in an electric field.

That is, a general liquid crystal display device requires a liquid crystal panel in which a liquid crystal layer is bonded between first and second substrates having an array layer for driving a liquid crystal and a color filter layer for color implementation. It is a component, which causes a difference in transmittance by changing the arrangement direction of the liquid crystal molecules with an electric field inside.

The transmittance difference of the liquid crystal panel is displayed in the form of a color image by reflecting the color combination of the color filter through the light of the back light placed on the back.

A general LCD manufacturing process may be divided into a cell process of completing a liquid crystal panel and a module process of integrating a liquid crystal panel and a backlight with the liquid crystal panel.

The cell process repeats the processes of thin film deposition, photo-lithography, etching, etc. several times to implement an array layer and a color filter layer on each substrate. After forming a seal pattern for bonding to any one of the second substrates, the two substrates are bonded to each other with the liquid crystal layer interposed therebetween to complete the liquid crystal panel. The completed liquid crystal panel is a polarizing plate and a driving circuit in a module process. After the furnace lamp is attached, it is integrated with the backlight to form a liquid crystal display device.

In this case, especially as a final step of the cell process, a test image is realized by applying an electrical signal through contact with the auto probe pad to the liquid crystal panel before the driving circuit is attached, and through a test of visually confirming this by the operator The liquid crystal panel inspection step of determining whether or not is performed.

Hereinafter, an auto probe inspection method of a liquid crystal display will be described with reference to the drawings.

FIG. 1 is a view schematically illustrating a liquid crystal panel to which a signal applied during an auto probe inspection of a conventional liquid crystal display is applied.

As illustrated, the liquid crystal panel is divided into a display area AA in which an image is displayed and a non-display area NAA surrounding the display area.

In this case, the gate lines GL and the data lines DL are formed in the display area AA to define red, green, and blue pixels, and 2n green pixels and 2n blue are formed in one horizontal pixel line. The pixels are arranged sequentially.

Although not illustrated, a switching thin film transistor and a liquid crystal connected to the gate line GL and the data line DL are positioned in each pixel area.

In addition, first and second auto probe pads 25a and 25b for auto probe inspection are formed at one side of the non-display area NAA.

In this case, the first and second auto probe pads 25a and 25b may include the first red, green and blue auto probe pads 20a, 22a, 24a, which are connected to the red, green, and blue pixels of the display area AA. Second red, green, and blue auto probe pads 20b, 22b, and 24b are formed at both sides of the non-display area NAA to be electrically connected to the plurality of red, green, and blue pixels.

That is, two auto probe pads are formed for each color to apply the same gray level signal to pixels of the same color.

In this case, the first and second red auto probe pads 20a and 20b are connected to 2n red pixels of one horizontal pixel line of the display area AA, and the first and second green auto probe pads 22a and 22b are connected to each other. ) Is connected to 2n green pixels of one horizontal pixel line of the display area AA, and the first and second blue auto probe pads 24a and 24b are connected to 2n of one horizontal pixel line of the display area AA. Are connected to two blue pixels.

In a similar manner to the gate and data driving circuits, the gate signals are sequentially applied to the gate lines GL, and the first red, green, and blue auto probe pads 20a, 22a, 24a, and the second red, green, An image is displayed by applying a data signal to the data line DL through contact with the blue auto probe pads 20b, 22b, and 24b.

An image displayed in such a configuration is visually inspected to check for defects such as dot defects or line defects.

On the other hand, in high resolution panels, cross talk defects frequently occur in which desired gray scales are not displayed due to the gray scales of adjacent pixels.

However, the conventional auto probe check applies a different data signal to vertically adjacent pixels so that vertical crosstalk can be checked, but a common data signal is applied to 2n red pixels of one horizontal pixel line and one horizontal pixel. A common data signal is applied to 2n green pixels of a line, and a common data signal is applied to 2n blue pixels of a horizontal pixel line. Therefore, a different data signal cannot be applied to horizontally adjacent pixels. A problem arises.

Therefore, the liquid crystal panel, the driving circuit, and the backlight are integrally modularized, and horizontal crosstalk inspection is performed.

At this time, when the horizontal crosstalk failure occurs, the modular liquid crystal display device is discarded or the liquid crystal panel is discarded after separating the driving circuit and the backlight, so that a loss of manufacturing cost occurs, and the time and manpower generated by modularization and crosstalk inspection are generated. And, a problem arises that requires equipment.

The present invention has been made to solve the above problems, and an object thereof is to provide an auto probe inspection method capable of inspecting cross talk of a liquid crystal panel before modularization.

In addition, there is another purpose to reduce the loss of manufacturing costs due to the defect of the liquid crystal panel, to reduce the time and manpower generated by the modularization, crosstalk inspection, and equipment.

In order to achieve the above object, the present invention includes a substrate divided into a display area for displaying an image and a non-display area surrounding the display area; A gate wiring and a data wiring formed on the substrate and crossing each other; A plurality of pixels formed in a matrix in the display area by the gate lines and the data lines; A first auto probe pad formed in the non-display area and connected to a portion of 2n pixels of one horizontal pixel line through the data line; And a second auto probe pad spaced apart from the first auto probe pad and formed in the non-display area, the second auto probe pad being connected to the other of the 2n pixels of the one horizontal pixel line through the data line. do.

In this case, the first auto probe pad includes a first red auto probe pad, a first green auto probe pad, and a first blue auto probe pad, and the second auto probe pad includes a second red auto probe pad and a second green probe pad. An auto probe pad and a second blue auto probe pad.

The first auto probe pad may include a first red auto probe pad, a first green auto probe pad, and a first blue auto probe pad, and the second auto probe pad may include a second red auto probe pad and a second green auto probe pad. Includes an auto probe pad and a second blue auto probe pad

The display area may include a first display area corresponding to the plurality of pixels connected to the first auto probe pad, and a second display area corresponding to the plurality of pixels connected to the second auto probe pad. do.

In this case, the first display area is divided into first to third areas along a direction parallel to the data line, and any one of the first to third areas displays white color.

The second display area is divided into first to third areas in a direction parallel to the data line, and any one of the first to third areas displays white color.

Meanwhile, the rest of the first to third regions display black or gray.

The data signals applied to the first and second display regions are inverted for each frame.

According to the present invention, n pixels of one horizontal pixel line are connected to the first auto probe pad, and n pixels of one horizontal pixel line are connected to the second auto probe pad, thereby vertical and horizontal crosstalk of the liquid crystal panel. There is an effect that can check.

FIG. 1 is a view schematically illustrating a liquid crystal panel to which a signal applied during an auto probe inspection of a conventional liquid crystal display is applied.
2 is a view schematically showing a liquid crystal panel according to an embodiment of the present invention.
3 is a plan view illustrating an inspection image of a liquid crystal display according to an exemplary embodiment of the present invention.
4 is a diagram illustrating a data signal voltage for displaying the inspection image of FIG. 3.
5 is a plan view illustrating a plurality of inspection images displayed by the liquid crystal panel according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

2 is a view schematically showing a liquid crystal panel according to an embodiment of the present invention.

As shown, the liquid crystal panel 110 according to the embodiment of the present invention is divided into a display area AA for displaying an image and a non-display area NAA surrounding the display area AA.

In this case, the liquid crystal panel 110 includes a first substrate on which the thin film transistor element is formed, a liquid crystal layer formed on the first substrate, and a second substrate covering the liquid crystal layer and bonded to the first substrate.

In addition, the gate line GL and the data line DL are formed along the first and second directions X1 and X2, respectively, in the display area AA on the first substrate to cross each other to define the pixel area. In one horizontal pixel line along the first direction X1, 2n green pixels and 2n blue pixels are sequentially disposed.

Although not illustrated, a switching thin film transistor and a liquid crystal connected to the gate line GL and the data line DL are positioned in each pixel area.

In addition, left and right sides of the non-display area NAA are formed with the first auto probe pad 125a and the second auto probe pad 125b spaced apart from the first auto probe pad 125a for auto probe inspection, respectively. do.

In this case, when the number of red, green, and blue pixels of one horizontal pixel line of the display area AA is 2n, each of the first auto probe pad 125a and the second auto probe pad 125b is one horizontal. The n red, green, and blue pixels of the pixel line are electrically connected to each other through the data line DL.

In more detail, the first auto probe pad 125a is connected to a data line DL corresponding to the first to n-th red, green, and blue pixels, and the second auto probe pad 125b is formed of (n). +1) to 2n nth data lines DL corresponding to the red, green, and blue pixels.

That is, the first to n th red pixels Pr (1) to Pr (n) are connected to the first red auto probe pad 120a of the first auto probe pad 125a and the first green auto probe pad ( The first to nth green pixels Pg (1) to Pg (n) are connected to 122a, and the first to nth blue pixels Pb (1) to Pb (are connected to the first blue auto probe pad 124a. n)) is connected.

The (n + 1) to 2n red pixels Pr (n + 1) to Pr (2n) are connected to the second red auto probe pad 120b of the second auto probe pad 125b. (N + 1) to 2n green pixels Pg (n + 1) to Pg (2n) are connected to the green auto probe pad 122b, and (n) to the second blue auto probe pad 124b. The +1 to 2n blue pixels Pb (n + 1) to Pb (2n) are connected.

In a similar manner to the gate and data driving circuits, a gate signal is applied to the gate wiring GL, and a data signal is applied to the data wiring through contact with the first and second auto probe pads 125a and 125b for inspection. Display the video.

Meanwhile, in the present invention, the same number of red, green, and blue pixels connected to the first and second auto probe pads 125a and 125b are configured equally, but are connected to the first and second auto probe pads 125a and 125b. The number of red, green, and blue pixels to be used may be different for convenience.

Inspection images displayed in such a configuration are visually inspected to examine whether there are defects such as dot defects or line defects, and vertical cross torque and horizontal cross torque.

Hereinafter, the crosstalk inspection will be described with reference to the accompanying drawings.

3 is a plan view illustrating an inspection image of the liquid crystal panel according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating a data signal voltage for displaying the inspection image of FIG. 3.

As shown in FIG. 3, the display area AA of the liquid crystal panel includes a first display area AA1 and a second auto probe pad (125b in FIG. 2) corresponding to the first auto probe pad (125a in FIG. 2). It is divided into a second display area AA2 corresponding to.

In this case, for convenience of description, a direction parallel to the gate line G1 of FIG. 2 is referred to as a first direction X1, and a direction parallel to the data line DL of FIG. 2 is referred to as a second direction X2.

In this case, the first display area AA1 is displayed such that the first to third horizontal areas HPL1, HPL2, and HPL3 have a pattern divided into black, white, and black in the second direction X2, respectively, and the second display area AA2 is black as a whole.

On the other hand, for convenience of description, but may be gray in another embodiment, for example, gray may be 127 gray when the total gray is 256, or gray may be 31 gray when the total gray is 64.

The first and second auto probe pads 125a and 125b of FIG. 2 are used to display a pattern divided into black, white, and black of the first display area AA1 and a black image of the second display area AA2. As shown in FIG. 4, the timing of the signal voltage applied to the first auto probe pad 125a may include the first to third horizontal regions HPL1, HPL2, and HPL3 corresponding to the first to third horizontal regions HPL1, HPL2, and HPL3. Low (± Vl) -high (± Vh) -low (± Vl) are sequentially applied in the third sections T1, T2, and T3 to display black, white, and black.

In addition, a low (± Vl) is applied to the data signal applied to the second auto probe pad 125b in the first to third periods T1, T2, and T3 to display black.

In addition, by inverting the signal for each of the frames F1 and F2 and changing the polarity of the data signal, an afterimage occurring in the first and second display areas AA1 and AA2 can be prevented.

The inspection image displayed through such a configuration can form the boundary between the white and the black vertically and horizontally, and can be visually checked whether the crosstalk phenomenon is generated based on the gradation distortion at the boundary between the white and the black. .

Therefore, it is possible to inspect the vertical and horizontal crosstalks as well as defects such as dot defects or line defects.

That is, vertical and horizontal crosstalk can be inspected without modularization, and thus only the liquid crystal panel 110 of FIG.

Therefore, it is possible to reduce the cost than when detecting a defect by inspecting the vertical crosstalk of the conventional modular liquid crystal display, and it is possible to reduce the equipment, time and manpower required for modularization and crosstalk detection. have.

The black, white, and black patterns displayed on the first and second display areas AA1 and AA2 of the liquid crystal panel of the present invention can be variously changed.

Hereinafter, black, white, and black patterns displayed on the first and second display areas AA1 and AA2 will be described with reference to the drawings.

5 is a plan view illustrating a plurality of inspection images displayed by the liquid crystal panel according to an exemplary embodiment of the present invention.

As shown, the display area according to the exemplary embodiment of the present invention displays various black, white, and black patterns on the first and second display areas AA1 and AA2.

That is, the white pattern may be displayed on any one of the top, middle, and bottom of the first display area AA1, or the white pattern may be displayed on any one of the top, middle, or bottom of the second display area AA2.

In this way, the displayed patterns of the first and second display areas AA1 and AA2 may be changed to visually check whether crosstalk is generated based on grayscale distortion at the boundary between white and black.

Therefore, it is possible to inspect the vertical and horizontal crosstalks as well as defects such as dot defects or line defects.

That is, vertical and horizontal crosstalk with the driving circuit, the backlight unit, and the like can be inspected before modularization, so that only the liquid crystal panel 110 of FIG. 2 can be discarded when the defect is detected.

The width of the pattern may be adjusted in the first and second display areas AA1 and AA2 displayed on the liquid crystal panel by changing the number of pixels connected to the first and second auto probe pads 125a and 125b, respectively.

As described above, the liquid crystal panel according to the embodiment of the present invention has the effect of reducing the cost compared to detecting the defect by inspecting the vertical cross talk of the conventional modular liquid crystal display, and required to modularize and detect the cross talk. There is an effect to save equipment, time and manpower.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and changes to the present invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

110: liquid crystal panel 120a: first red auto probe pad
120b: second red auto probe pad 122a: first green auto probe pad
122b: second green auto probe pad 124a: first blue auto probe pad
124b: second blue auto probe pad 125a: first auto probe pad
125b: second auto probe pad
AA: Display Area NAA: Non-Display Area

Claims (10)

A substrate divided into a display area in which an image is displayed and a non-display area surrounding the display area;
A gate wiring and a data wiring formed on the substrate and crossing each other;
A plurality of pixels formed in a matrix in the display area by the gate lines and the data lines;
A first auto probe pad formed in the non-display area and connected to a portion of 2n pixels of one horizontal pixel line through the data line;
A second auto probe pad spaced apart from the first auto probe pad and formed in the non-display area and connected to the other of the 2n pixels of the one horizontal pixel line through the data line;
Including,
The display area includes a first display area corresponding to the plurality of pixels connected to the first auto probe pad, and a second display area corresponding to the plurality of pixels connected to the second auto probe pad.
The first display area is divided into first to third partial areas along a direction parallel to the data line, and any one of the first to third partial areas displays white.
Display panel.
The method of claim 1,
The 2n pixels may include first to second n pixels, the first auto probe pad may be connected to the first to n pixels, and the second auto probe pad may be formed of the (n + 1) to n pixels. A display panel connected to the (2n) th pixel.

The method of claim 1,
The first auto probe pad includes a first red auto probe pad, a first green auto probe pad, and a first blue auto probe pad, and the second auto probe pad includes a second red auto probe pad and a second green auto probe pad. A display panel comprising a pad and a second blue auto probe pad.
delete delete A substrate divided into a display area in which an image is displayed and a non-display area surrounding the display area;
A gate wiring and a data wiring formed on the substrate and crossing each other;
A plurality of pixels formed in a matrix in the display area by the gate lines and the data lines;
A first auto probe pad formed in the non-display area and connected to a portion of 2n pixels of one horizontal pixel line through the data line;
A second auto probe pad spaced apart from the first auto probe pad and formed in the non-display area and connected to the other of the 2n pixels of the one horizontal pixel line through the data line;
Including,
The display area includes a first display area corresponding to the plurality of pixels connected to the first auto probe pad, and a second display area corresponding to the plurality of pixels connected to the second auto probe pad.
The second display area is divided into first to third partial areas along a direction parallel to the data line, and one of the first to third partial areas displays white.
The method according to claim 1 or 6,
The display panel of which the remaining of the first to third partial regions displays black or gray.
The method according to claim 1 or 6,
A display panel in which data signals applied to the first and second display areas are inverted for each frame.
The method of claim 1,
And a second display area in which all of the second display area is black or gray.
The method of claim 6,
And the first display area is entirely black or gray.

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