Electrical measurement circuit and medium-large display screen

Abstract

The utility model discloses an electrical testing circuit and a medium-and-large-scale display screen. The electrical testing circuit comprises a first electrical testing unit and a second electrical testing unit. The first electrical measurement unit is arranged in a top frame area of the middle-large size display screen; the second electrical measurement unit is arranged in a bottom frame area of the middle-large size display screen; the first electrical measurement unit is electrically connected with each connecting end in the first direction of the pixel unit array of the medium-large display screen; and the second electrical measurement unit is electrically connected with each connecting end in the second direction of the pixel unit array of the medium-large display screen. A first electrical testing unit is arranged in a top frame area of a medium-large display screen to test an R picture, a G picture and a B picture of a pixel unit array, and a second electrical testing unit is arranged in a bottom frame area of the medium-large display screen to test a gray scale picture of the pixel unit array. And meanwhile, the second test unit can test whether the data line is disconnected or not, so that the test efficiency is improved, and the omission ratio is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen electrical measurement, and particularly relates to an electrical measurement circuit and a medium and large-sized display screen. Background Art

[0002] In recent years, liquid crystal display technology has achieved rapid development. It has excellent characteristics such as high maturity, low radiation, low power consumption, and easy integration. Therefore, it has been widely used in the display field, especially in the display of portable electronic products.

[0003] During the production process of liquid crystal display panels, tests are required to determine whether the liquid crystal display panels meet the quality requirements. Electrical measurement is carried out before the display screens flow into the subsequent processes. Qualified products are selected to enter the subsequent processes, and unqualified products are selected to prevent them from being mixed into the qualified products flowing into the subsequent processes, so as not to affect the yield of the subsequent processes.

[0004] When an LCD display module is in the production process, picture failures are likely to occur, resulting in a certain point in the displayed image always showing the same color, and this kind of failure is irreparable. Only by replacing the entire LCD display module can the problem be solved. Therefore, picture detection is carried out after the production of LCD display modules. The electrical measurement of the LCD display module uses a signal source to drive the LCD display module to display various pictures, and by comparing with the established picture standards, it is judged whether the display function of the LCD display module is normal.

[0005] However, for existing medium and large-sized display screens, due to the relatively large RC Loading of the Panel, the electrical measurement circuit cannot be fully placed at the bottom of the Panel. If it is placed at the bottom, due to the too large Loading and too small bottom space, the electrical measurement transistors can only be designed as relatively small transistors, resulting in unsatisfactory electrical measurement effects, such as low electrical measurement efficiency and high missed detection rate. This causes defective products to flow to subsequent processes, resulting in a large amount of product waste and thus reducing the display quality. Summary of the Utility Model

[0006] Existing medium and large-sized display screens have problems of low electrical measurement efficiency and high missed detection rate, resulting in defective products flowing to subsequent processes.

[0007] To solve the above problems, an electrical measurement circuit and a medium and large-sized display screen are proposed. By setting the first electrical measurement unit in the top border area of the medium and large-sized display screen to test the R picture, G picture, and B picture of the pixel unit array, and setting the second electrical measurement unit in the bottom border area of the medium and large-sized display screen to test the grayscale picture of the pixel unit array, and at the same time, the second test unit can also test whether the data line is open-circuited, improving the test efficiency and reducing the missed detection rate.

[0008] An electrical measurement circuit for testing medium and large-sized display screens, comprising:

[0009] A first electrical measurement unit;

[0010] A second electrical measurement unit;

[0011] The first electrical measurement unit is arranged in the top border area of the medium and large-sized display screen;

[0012] The second electrical measurement unit is arranged in the bottom border area of the medium and large-sized display screen;

[0013] The first electrical measurement unit is electrically connected to each connection end in the first direction of the pixel unit array of the medium and large-sized display screen;

[0014] The second electrical measurement unit is electrically connected to each connection end in the second direction of the pixel unit array of the medium and large-sized display screen.

[0015] Combined with the electrical measurement circuit described in the first aspect of the present invention, in the first possible implementation manner, the first electrical measurement unit includes:

[0016] Multiple first electrical measurement TFTs;

[0017] A first input circuit;

[0018] A second input circuit;

[0019] The first input circuit is electrically connected to the gates of the multiple first electrical measurement TFTs respectively;

[0020] The source terminals of the multiple first electrical measurement TFTs are electrically connected to the first ends of the pixel units in the pixel unit array respectively;

[0021] The second input circuit is electrically connected to the drain terminals of the multiple first electrical measurement TFTs respectively according to the set picture sequence.

[0022] Combined with the first possible implementation manner of the first aspect of the present invention, in the second possible implementation manner, the second input circuit includes:

[0023] Multiple groups of R potential input circuits, G potential input circuits and B potential input circuits;

[0024] The R potential input circuit, G potential input circuit and B potential input circuit are electrically connected to the pixel units respectively according to the picture sequence.

[0025] Combined with the second possible implementation manner of the first aspect of the present invention, in the third possible implementation manner, the picture sequence is:

[0026] R picture, G picture, B picture.

[0027] In combination with the first possible implementation manner of the first aspect of the present utility model, in the fourth possible implementation manner, the second electrical measurement unit includes:

[0028] A plurality of second electrical measurement TFTs;

[0029] A third input circuit;

[0030] A fourth input circuit;

[0031] The third input circuit is electrically connected to the gates of the plurality of second electrical measurement TFTs respectively;

[0032] The drain terminals of the plurality of second electrical measurement TFTs are electrically connected to the second ends of the pixel units in the pixel unit array respectively;

[0033] The fourth input circuit is electrically connected to the source terminals of the plurality of second electrical measurement TFTs.

[0034] In combination with the fourth possible implementation manner of the first aspect of the present utility model, in the fifth possible implementation manner, the source terminals of the plurality of second electrical measurement TFTs are commonly connected and then electrically connected to the fourth input circuit.

[0035] In a second aspect, a medium and large-sized display screen includes the electrical measurement circuit described in the first aspect. Among them, it further includes:

[0036] A top border area;

[0037] A bottom border area;

[0038] An AA display area;

[0039] The electrical measurement circuit includes a first electrical measurement unit and a second electrical measurement unit; the first electrical measurement unit is arranged in the top border area of the medium and large-sized display screen, and the second electrical measurement unit is arranged in the bottom border area of the medium and large-sized display screen;

[0040] The first electrical measurement unit and the second electrical measurement unit are respectively connected to the connection ends in the first direction and the second direction of the pixel units in the pixel unit array of the AA display area.

[0041] In combination with the medium and large-sized display screen described in the second aspect of the present utility model, in the first possible implementation manner, the first electrical measurement unit is used to test the R picture, G picture, and B picture of the pixel unit array, and the second electrical measurement unit is used to test the gray-scale picture of the pixel unit array.

[0042] Implementing the electrical measurement circuit and the large and medium-sized display screen of the present utility model, by arranging the first electrical measurement unit in the top border area of the large and medium-sized display screen to test the R picture, G picture, and B picture of the pixel unit array, and arranging the second electrical measurement unit in the bottom border area of the large and medium-sized display screen to test the gray-scale picture of the pixel unit array. At the same time, the second test unit provided can also test whether the data line is open-circuited, improving the test efficiency and reducing the missed detection rate. Brief Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0044] Figure 1 It is a schematic structural diagram of the large and medium-sized display screen in the present utility model;

[0045] Figure 2 It is a schematic circuit connection diagram of the electrical measurement circuit in the present utility model;

[0046] The names of the parts referred to by each number in the drawings are: 100 - large and medium-sized display screen, 110 - top border area, 120 - bottom border area, 130 - AA display area, 140 - pixel unit array, 210 - first electrical measurement unit, 211 - first electrical measurement TFT, 212 - first input circuit, 213 - second input circuit, 220 - second electrical measurement unit, 221 - second electrical measurement, 222 - third input circuit, 223 - fourth input circuit. Detailed Embodiment

[0047] The following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, other embodiments obtained by those of ordinary skill in the art without creative efforts all fall within the scope of protection of the present utility model.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0052] In the existing medium and large-sized display screen 100, there are problems of low electrical test efficiency and high missed inspection rate, resulting in defective products flowing to subsequent processes.

[0053] In view of the above problems, an electrical test circuit and a medium and large-sized display screen 100 are proposed.

[0054] An electrical test circuit, such as Figure 1 , Figure 1 is a schematic structural diagram of the medium and large-sized display screen 100 in the present utility model; it is used to test the medium and large-sized display screen 100, and includes a first electrical test unit 210 and a second electrical test unit 220; the first electrical test unit 210 is disposed in the top border area 110 of the medium and large-sized display screen 100; the second electrical test unit 220 is disposed in the bottom border area 120 of the medium and large-sized display screen 100; the first electrical test unit 210 is electrically connected to each connection end in the first direction of the pixel unit array 140 of the medium and large-sized display screen 100; the second electrical test unit 220 is electrically connected to each connection end in the second direction of the pixel unit array 140 of the medium and large-sized display screen 100. By disposing the first electrical test unit 210 in the top border area 110 of the medium and large-sized display screen 100 to test the R picture, G picture, and B picture of the pixel unit array 140, and disposing the second electrical test unit 220 in the bottom border area 120 of the medium and large-sized display screen 100 to test the gray scale picture of the pixel unit array 140, and at the same time, the second test unit disposed can also test whether the data line is open-circuited, improving the test efficiency and reducing the missed inspection rate.

[0055] As shown Figure 1 , a first electrical measurement unit 210 is provided at the top, and a second electrical measurement unit 220 is also provided at the bottom. Among them, the top electrical measurement can measure conventional pictures such as red, green, blue, white, black, etc. The second test unit can achieve white and black pictures, and the second test unit can avoid missing detection of open circuits in the Fanout area traces. Because if the electrical measurement circuit at the bottom is not added, the open circuit of the Fanout trace cannot be detected and flows to the subsequent process, reducing the product yield.

[0056] Furthermore, as shown Figure 2 , Figure 2 is a circuit connection schematic diagram of the electrical measurement circuit in the present utility model; the first electrical measurement unit 210 includes a plurality of first electrical measurement TFTs 211, a first input circuit 212 (VGG), and a second input circuit 213 (RGB); the first input circuit 212 (VGG) is electrically connected to the gates of the plurality of first electrical measurement TFTs 211 respectively; the source electrodes of the plurality of first electrical measurement TFTs 211 are electrically connected to the first ends of the pixel units in the pixel unit array 140 respectively; the second input circuit 213 (RGB) is electrically connected to the drain electrodes of the plurality of first electrical measurement TFTs 211 respectively according to the set picture sequence.

[0057] Furthermore, as shown Figure 2 , the second input circuit 213 (RGB) includes multiple groups of R potential input circuits, G potential input circuits, and B potential input circuits; the R potential input circuits, G potential input circuits, and B potential input circuits are electrically connected to the pixel units respectively according to the picture sequence.

[0058] Preferably, the picture sequence is R picture, G picture, B picture.

[0059] Furthermore, as shown Figure 2 , the second electrical measurement unit 220 includes a plurality of second electrical measurement TFTs 221, a third input circuit 222 (SW), and a fourth input circuit 223 (SA); the third input circuit 222 (SW) is electrically connected to the gates of the plurality of second electrical measurement TFTs 221 respectively; the drain electrodes of the plurality of second electrical measurement TFTs 221 are electrically connected to the second ends of the pixel units in the pixel unit array 140 respectively; the fourth input circuit 223 (SA) is electrically connected to the source electrodes of the plurality of second electrical measurement TFTs 221.

[0060] Furthermore, as shown Figure 2 , the source electrodes of the plurality of second electrical measurement TFTs 221 are commonly connected and then electrically connected to the fourth input circuit 223 (SA).

[0061] The principle of electrical measurement is as follows: when the first input circuit 212 (VGG) inputs a high level, the top first electrical measurement TFT 211 is fully turned on. By inputting the R potential, G potential, and B potential through the second input circuit 213 (RGB), electrical measurement of the R picture, G picture, and B picture can be achieved in the order of R, G, and B settings. After the first input circuit 212 (VGG) inputs a low level, the third input circuit 222 (SW) is set to a high level, and the fourth input circuit 223 (SA) inputs the corresponding potential to achieve electrical measurement of the grayscale picture. At the same time, it can also detect whether there are defects such as open circuits in the Fanout. For example, if there is an open circuit in a certain data line, there will be abnormalities such as vertical lines in the displayed picture, thereby determining that there is an abnormality in the display screen 100 and preventing it from entering the subsequent process, thus improving the competitiveness of the product.

[0062] In the second aspect, as Figure 1 , a medium and large-sized display screen 100 includes the electrical measurement circuit of the first aspect. Among them, it further includes a top border area 110, a bottom border area 120, and an AA display area 130; the electrical measurement circuit includes a first electrical measurement unit 210 and a second electrical measurement unit 220; the first electrical measurement unit 210 is arranged in the top border area 110 of the medium and large-sized display screen 100, and the second electrical measurement unit 220 is arranged in the bottom border area 120 of the medium and large-sized display screen 100; the first electrical measurement unit 210 and the second electrical measurement unit 220 are respectively connected to the connection ends in the first direction and the second direction of the pixel units of the pixel unit array 140 in the AA display area.

[0063] Furthermore, the first electrical measurement unit 210 is used to test the R picture, G picture, and B picture of the pixel unit array 140, and the second electrical measurement unit 220 is used to test the grayscale picture of the pixel unit array 140.

[0064] Implementing the electrical measurement circuit of the present utility model and the medium and large-sized display screen 100, by arranging the first electrical measurement unit 210 in the top border area 110 of the medium and large-sized display screen 100 to test the R picture, G picture, and B picture of the pixel unit array 140, and arranging the second electrical measurement unit 220 in the bottom border area 120 of the medium and large-sized display screen 100 to test the grayscale picture of the pixel unit array 140, and at the same time, the second test unit can also test whether the data line is open, improving the test efficiency and reducing the missed detection rate.

[0065] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electrical measurement circuit, characterized in that, For testing medium and large-sized displays, including: The first electrical measurement unit; The second electrical measurement unit; The first electrical measurement unit is arranged in the top border area of the medium and large-sized display; The second electrical measurement unit is arranged in the bottom border area of the medium and large-sized display; The first electrical measurement unit is electrically connected to each connection end in the first direction of the pixel unit array of the medium and large-sized display; The second electrical measurement unit is electrically connected to each connection end in the second direction of the pixel unit array of the medium and large-sized display.

2. The electrical measurement circuit according to claim 1, wherein The first electrical measurement unit includes: Multiple first electrical measurement TFTs; The first input circuit; The second input circuit; The first input circuit is electrically connected to the gates of the multiple first electrical measurement TFTs respectively; The source electrodes of the multiple first electrical measurement TFTs are electrically connected to the first ends of the pixel units in the pixel unit array respectively; The second input circuit is electrically connected to the drain electrodes of the multiple first electrical measurement TFTs respectively according to the set picture sequence.

3. The electrical measurement circuit according to claim 2, characterized in that, The second input circuit includes: Multiple groups of R potential input circuits, G potential input circuits and B potential input circuits; The R potential input circuit, G potential input circuit and B potential input circuit are electrically connected to the pixel unit according to the picture sequence respectively.

4. The electrical measurement circuit according to claim 3, wherein, The picture sequence is: R picture, G picture, B picture.

5. The electrical measurement circuit according to claim 2, characterized in that, The second electrical measurement unit includes: Multiple second electrical measurement TFTs; The third input circuit; The fourth input circuit; The third input circuit is electrically connected to the gates of the multiple second electrical measurement TFTs respectively; The drain electrodes of the multiple second electrical measurement TFTs are electrically connected to the second ends of the pixel units in the pixel unit array respectively; The fourth input circuit is electrically connected to the source electrodes of the multiple second electrical measurement TFTs.

6. The electrical measurement circuit according to claim 5, characterized in that, The source electrodes of the multiple second electrical measurement TFTs are commonly connected and then electrically connected to the fourth input circuit.

7. A medium or large-sized display screen, comprising the electrical measurement circuit according to any one of claims 1-6, characterized in that, It further includes: The top border area; The bottom border area; The AA display area; The electrical measurement circuit includes the first electrical measurement unit and the second electrical measurement unit; The first electrical measurement unit is arranged in the top border area of the medium and large-sized display, and the second electrical measurement unit is arranged in the bottom border area of the medium and large-sized display; The first electrical measurement unit and the second electrical measurement unit are respectively connected to the connection ends in the first direction and the second direction of the pixel units of the pixel unit array in the AA display area.

8. The medium and large-sized display screen according to claim 7, wherein, The first electrical measurement unit is used to test the R picture, G picture and B picture of the pixel unit array, and the second electrical measurement unit is used to test the gray-scale picture of the pixel unit array.

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