CN112530330A - Display device and method for inspecting display device - Google Patents
Display device and method for inspecting display device Download PDFInfo
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- CN112530330A CN112530330A CN202010969390.9A CN202010969390A CN112530330A CN 112530330 A CN112530330 A CN 112530330A CN 202010969390 A CN202010969390 A CN 202010969390A CN 112530330 A CN112530330 A CN 112530330A
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- display
- display device
- scanning line
- gate driver
- inspection
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention provides a display device and a method for inspecting the display device, which can improve the detection precision of display abnormity caused by the broken scanning line. A display device (1) is provided with: a plurality of pixels arranged in a matrix in the display region (21); a scanning line (SCL) connected to each of the pixels arranged in one direction in the display region and supplying a scanning signal (Vscan) to the scanning line (SCL); a 1 st gate driver (22-1) for supplying a scanning signal (Vscan) from one end of a scanning line (SCL); a 2 nd gate driver (22-2) for supplying a scanning signal (Vscan) from the other end of the scanning line (SCL); and a display control circuit (4) for controlling the display of the screen in the display area (21). In the inspection step, the display control circuit (4) floats one end or the other end of the scanning line (SCL) to display all pixels in the display area (21) in a lighting manner.
Description
Technical Field
The invention relates to a display device and a method for inspecting the display device.
Background
Patent document 1 discloses a technique for detecting disconnection of signal lines or scanning lines or degradation of each element constituting a display region.
Documents of the prior art
Patent document
Patent document 1: JP patent application laid-open No. 2017-containing 181574
Disclosure of Invention
In recent years, as display devices have become larger, gate drivers have been arranged on two opposite sides of a display region to supply scanning signals from the two sides of a scanning line in order to reduce the time constant of the scanning line. In such a configuration, even if the scanning line is disconnected during the manufacturing process, the scanning signal is supplied from both ends of the scanning line, and therefore, the display abnormality due to the disconnection of the scanning line may not be detected in the lighting inspection of the cell. In this case, there is a possibility that a display abnormality such as a horizontal line may occur due to a change in Vth caused by energization of the pixel transistor, and therefore, in the inspection step, it is necessary to improve the detection accuracy of the display abnormality caused by disconnection of the scanning line in the manufacturing process.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device and a method for inspecting the display device, which can improve the detection accuracy of detecting a display abnormality caused by a disconnection of a scanning line.
A display device according to one aspect of the present invention includes: a plurality of pixels arranged in a matrix in the display region; a scanning line connected to each of the pixels arranged in one direction in the display region and configured to supply a scanning signal to the scanning line; a 1 st gate driver for supplying the scan signal from one end of the scan line; a 2 nd gate driver for supplying the scan signal from the other end of the scan line; and a display control circuit that controls display of a screen in the display region, wherein the display control circuit floats one end or the other end of the scanning line in an inspection process, and performs lighting display of all pixels in the display region.
A method for inspecting a display device according to an aspect of the present invention, the display device includes: a plurality of pixels arranged in a matrix in the display region; a scanning line connected to each of the pixels arranged in one direction in the display region and configured to supply a scanning signal to the scanning line; a 1 st gate driver for supplying the scan signal from one end of the scan line; and a 2 nd gate driver for supplying the scanning signal from the other end of the scanning line, the method for detecting a display device includes: a step of floating one end of the scanning line to display all pixels of the display area; and floating the other end of the scanning line to display all pixels of the display area.
Drawings
Fig. 1 is a diagram showing an example of a schematic configuration of a display device according to an embodiment.
Fig. 2 is a diagram showing an example of a frame structure of the display device according to the embodiment.
Fig. 3A is a diagram showing an example of a schematic configuration of the 1 st gate driver and the 2 nd gate driver.
Fig. 3B is a diagram showing an example of the schematic configuration of the 1 st gate driver and the 2 nd gate driver.
Fig. 3C is a diagram showing an example of the schematic configuration of the 1 st gate driver and the 2 nd gate driver.
Fig. 4 is a diagram showing an example of a specific processing flow of the inspection method of the display device according to the embodiment.
Fig. 5A is a schematic diagram illustrating example 1 of the switching control of the inspection method of the display device according to the embodiment.
Fig. 5B is a schematic diagram illustrating example 1 of the switching control in the inspection method of the display device according to the embodiment.
Fig. 6A is a schematic diagram illustrating an example 2 of the switch control in the inspection method of the display device according to the embodiment.
Fig. 6B is a schematic diagram illustrating an example 2 of the switch control in the inspection method of the display device according to the embodiment.
The reference numerals are explained below:
1 display device
2 control device
3 driver IC
4 display control circuit
6-1, 6-2 inspection terminal
11 glass substrate
12 relay substrate
21 display area
22-1 st gate driver
22-2 nd gate driver
23 Source driver
221-1 st shift register
221-2 nd shift register
100 inspection apparatus
Cst capacitive element
DTL signal line
LC liquid crystal element
Pix pixel
SCL scanning line
SW1-1, SW1-2, SW2-1, SW2-2 switch circuits (scanning line driving circuit)
Vscan scan signal
Vpix pixel signal
Detailed Description
A mode (embodiment) for carrying out the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the contents described in the following embodiments. The components described below include components that can be easily conceived by those skilled in the art, and substantially the same components. The following constituent elements can be appropriately combined. It is to be noted that the disclosure is merely an example, and it is needless to say that appropriate modifications that can be easily conceived by those skilled in the art while keeping the gist of the invention are also included in the scope of the present invention. In addition, in order to clarify the description, the width, thickness, shape, and the like of each part in the drawings may be schematically shown as compared with the actual form, but the present invention is only an example and is not limited to the explanation of the present invention. In the present specification and the drawings, the same reference numerals are given to the same elements as those described in the already-shown drawings, and detailed description thereof may be omitted as appropriate.
Fig. 1 is a diagram showing an example of a schematic configuration of a display device according to an embodiment. The display device 1 of the present embodiment includes a display region 21 and a driver IC3 on a glass substrate 11, and is connected between the driver IC3 and the control device 2 via a relay substrate 12 made of, for example, a Flexible Printed Circuit (FPC) or the like.
The control device 2 is configured as a storage device including, for example, a CPU (Central Processing Unit) and a memory, and executes a program using these hardware resources, thereby realizing various functions of the display device 1. The control device 2 controls the driver IC3 to process an image displayed on the display device 1 as information of image input gradation in accordance with the execution result of the program.
Fig. 2 is a diagram showing an example of a frame structure of the display device according to the embodiment. The display device 1 of the present embodiment includes a display region 21, a 1 st gate driver 22-1, a 2 nd gate driver 22-2, a source driver 23, and a display control circuit 4 for controlling screen display in the 1 st gate driver 22-1, the 2 nd gate driver 22-2, and the display region 21. The display control circuit 4 has functions of an interface (I/F) between the source driver 23 and the control device 2 and a timing generator. The 1 st gate driver 22-1, the 2 nd gate driver 22-2, the source driver 23, and the display control circuit 4 may be included in the driver IC3 shown in fig. 1, and may be in a form in which the 1 st gate driver 22-1 and the 2 nd gate driver 22-2 are provided on the glass substrate 11, for example. Fig. 2 illustrates a configuration in which the 1 st gate driver 22-1 and the 2 nd gate driver 22-2 are provided on the opposite sides of the display region 21 on the glass substrate 11.
The display region 21 includes a matrix (row-column shape) in which a plurality of pixels Pix are arranged in M rows × N columns. In this specification, a row refers to a pixel row having N pixels Pix arranged in one direction. The column refers to a pixel column having M pixels Pix arranged in a direction orthogonal or intersecting the row arrangement direction. Then, the values of M and N are decided according to the display resolution in the vertical direction and the display resolution in the horizontal direction.
Each pixel Pix is configured to have a TFT element Tr and a liquid crystal element LC. In each pixel Pix, a capacitive element Cst is formed in parallel with the liquid crystal element LC.
In the display region 21, the scanning lines SCL are wired for each row and the signal lines DTL are wired for each column with respect to the arrangement of M rows and N columns of the pixels Pix. The 1 st gate driver 22-1 and the 2 nd gate driver 22-2 sequentially supply the scanning signals Vscan (1, 2, 3, … …, M) to the scanning lines SCL, respectively. The pixel signals Vpix (1, 2, 3, … …, N) are supplied from the source driver 23 to the respective signal lines DTL. The scanning signals Vscan (1, 2, 3, … …, M) are supplied to the gates of the TFT elements Tr constituting the pixels Pix. The pixel signals Vpix (1, 2, 3, … …, N) are supplied to the sources of the TFT elements Tr constituting the respective pixels Pix.
One end of the liquid crystal element LC and one end of the capacitive element Cst are connected to the drain of the TFT element Tr of each pixel Pix. The other end of the liquid crystal element LC and the capacitive element Cst of each pixel Pix are connected to a common electrode COM formed over the entire display region 21. In the present embodiment, the common electrode COM is a transparent electrode provided in common to all the pixels Pix in the display region 21, and a constant common voltage VCOMDC is applied thereto. That is, the display device 1 in the present embodiment is a so-called common DC liquid crystal display device.
In the example shown in fig. 2, the common electrode COM is provided in common to all the pixels Pix in the display area 21, and a plurality of common electrodes COM may be provided in a divided manner for each column or each plurality of columns. The other end of the capacitive element Cst may be connected to a wiring for supplying a predetermined potential other than the common electrode COM.
The display device 1 may be a so-called common inversion type liquid crystal display device in which the voltage applied to the common electrode COM is inverted for each frame. The display device 1 is not limited to a liquid crystal display device, and may be, for example, an Organic EL display using an Organic Light Emitting Diode (OLED) as a display element. The display device 1 may be an inorganic EL display using inorganic light emitting diodes (micro leds) as display elements. The Display device 1 may be an Electrophoretic Display (EPD).
The display device 1 may be a display device with a touch detection function, for example, in which a capacitive touch sensor is integrated. The integration of the display device 1 with the capacitive touch sensor built therein is, for example, a structure including a part of a substrate or an electrode for display and a part of a substrate or an electrode for a touch sensor. Alternatively, the display device 1 may be a display device with a touch detection function of a so-called On Cell type, in which a capacitive touch sensor is mounted, for example. The present disclosure is not limited by way of the display device 1.
In the present embodiment, as shown in fig. 2, in the display device 1, the inspection terminals 6-1 and 6-2 connected to the inspection device 100 in the inspection step are provided on the glass substrate 11. In the inspection process of the display device 1, the display device 1 is connected to the inspection device 100 through the inspection terminals 6-1 and 6-2. The inspection apparatus 100 outputs an inspection signal to be described later to the 1 st gate driver 22-1, the 2 nd gate driver 22-2, and the display control circuit 4 via the inspection terminals 6-1 and 6-2 each composed of a plurality of pads. In fig. 2, the inspection terminals 6-1 and 6-2 are provided for the 1 st gate driver 22-1 and the 2 nd gate driver 22-2, respectively, but one inspection terminal may be provided.
Fig. 3A, 3B, and 3C are diagrams illustrating an example of the schematic configuration of the 1 st gate driver and the 2 nd gate driver.
The 1 st gate driver 22-1 and the 2 nd gate driver 22-2 are circuits that generate scanning signals Vscan (1, 2, 3, … …, M) sequentially supplied to the scanning lines SCL based on synchronization signals such as the start pulse SP and the shift clock SCK output from the display control circuit 4 or the inspection apparatus 100.
Fig. 3A, 3B, and 3C show schematic configurations of the 1 st gate driver 22-1 and the 2 nd gate driver 22-2 of the scanning line scl (M) in the M-th row (M is a natural number from 1 to M). In fig. 3A, 3B, and 3C, the switch circuits SW1-1, SW2-1 schematically show a scan line driving circuit that drives the scan line scl (m) of the mth row in the 1 st gate driver 22-1. In addition, the switch circuits SW1-2, SW2-2 schematically show a scan line driving circuit that drives the scan line SCL (m) of the m-th row in the 2 nd gate driver 22-2. In fig. 3A, 3B, and 3C, VGL is a low potential voltage supplied to the scanning line scl (m) when the scanning line scl (m) in the mth row is not selected, and CLK is a clock signal supplied to the scanning line scl (m) when the scanning line scl (m) in the mth row is selected.
Here, an example of the operation of each of the switch circuits SW1-1, SW2-1, SW1-2, and SW2-2 during actual operation of the display device 1 after shipment will be described. The following examples of the operation of the switch circuits SW1-1, SW2-1, SW1-2, and SW2-2 during actual operation of the display device 1 after shipment are given as examples, but are not limited thereto.
In actual operation of the display device 1 after shipment, when the scanning line scl (m) in the mth row is not selected, the switching circuits SW1-1 and SW1-2 are controlled to be turned off, and the switching circuits SW2-1 and SW2-2 are controlled to be turned on (see fig. 3A). When the scanning line SCL (m) of the m-th row is selected, the switch circuits SW1-1 and SW1-2 are controlled to be turned on, and the switch circuits SW2-1 and SW2-2 are controlled to be turned off. This causes a normal screen display to be performed in the display area 21.
The display device 1 is a display device with a touch detection function, and performs a so-called self-capacitance type touch detection mode in which the switch circuits SW1-1 and SW1-2 are turned off and the switch circuits SW2-1 and SW2-2 are turned on (see fig. 3A). Thereby, the scanning line scl (m) is fixed to VGL. Alternatively, in the detection period, the switch circuits SW1-1, SW1-2, SW2-1 and SW2-2 may be turned off (see fig. 3C) to set the scanning line scl (m) in a floating state, or a protection signal may be supplied to the scanning line scl (m).
Hereinafter, operations in the inspection step before shipment of the display device 1 according to the present embodiment will be described with reference to fig. 4 to 6.
Fig. 4 is a diagram showing an example of a specific processing flow of the inspection method of the display device according to the embodiment. Fig. 5A and 5B are schematic diagrams illustrating example 1 of the switching control in the inspection method of the display device according to the embodiment. Fig. 6A and 6B are schematic diagrams illustrating example 2 of the switch control in the inspection method of the display device according to the embodiment.
The display device 1 is connected to the inspection device 100 in an inspection process before shipment. The inspection apparatus 100 may output a synchronization signal such as the start pulse SP or the shift clock SCK as the inspection signal via the inspection terminals 6-1 and 6-2, or may output a control signal for controlling the display control circuit 4 and a synchronization signal such as the start pulse SP or the shift clock SCK from the display control circuit 4.
First, the inspection apparatus 100 controls the display control circuit 4 so that all pixels are lit in the display area 21 (step S101). In the present embodiment, displaying all the pixels Pix in the display region 21 at the same luminance is referred to as all-pixel lighting display. The brightness of the display by turning on all the pixels may be 100% brightness or may be a predetermined intermediate brightness. The present disclosure is not limited to the brightness of all pixel lit displays.
Subsequently, as shown in FIG. 5A and FIG. 5B, the inspection device 100 controls the switch circuits SW1-1 and SW2-1 to be turned off (step S102). Thus, the end of the scanning line SCL on the 1 st gate driver 22-1 side is in a floating state, and for example, when a disconnection occurs at a certain point of the scanning line SCL, a dark line is generated on the 2 nd gate driver 22-2 side compared to the disconnected point. The inspection device 100 detects the presence or absence of a dark line in the display area 21 (step S103), and if a dark line is present in the display area 21 (yes in step S103), the inspection device 100 determines that the display of the display device 1 is abnormal (step S104), and ends the present processing flow.
When there is no dark line in the display area 21 (step S103: NO), the inspection apparatus 100 controls the switch circuits SW1-2 and SW2-2 to be turned off as shown in FIGS. 6A and 6B (step S105). Thus, the end of the scanning line SCL on the 2 nd gate driver 22-2 side is in a floating state, and for example, when a disconnection occurs at a certain portion of the scanning line SCL, a dark line is generated on the 1 st gate driver 22-1 side compared to the disconnected portion. The inspection device 100 detects the presence or absence of a dark line in the display area 21 (step S106), and if a dark line is present in the display area 21 (yes in step S106), the inspection device 100 determines that the display of the display device 1 is abnormal (step S104), and ends the present processing flow.
If there is no dark line in the display area 21 (no in step S106), the inspection device 100 determines that the display of the display device 1 is normal (step S107), and ends the present processing flow.
In the inspection method of the display device 1 according to the present embodiment, as described above, one of the switch circuits SW1-1 and SW2-1 and the switch circuits SW1-2 and SW2-2 is controlled to be turned off, and the presence or absence of a dark line is determined in a state where one end or the other end of the scanning line SCL is floating. This can improve the detection accuracy of detecting a display abnormality caused by disconnection of the scanning line SCL.
In the inspection method of the display device 1 according to the present embodiment, the switching circuits SW1-1 and SW2-1 are turned off, the end portion of the scanning line SCL on the 1 st gate driver 22-1 side is floated to determine whether or not a dark line exists, and the switching circuits SW1-2 and SW2-2 are turned off, and the end portion of the scanning line SCL on the 2 nd gate driver 22-2 side is floated to determine whether or not a dark line exists. Accordingly, even when the scanning line SCL is disconnected in the outer region of the display region 21, that is, in the vicinity of the 1 st gate driver 22-1 or the 2 nd gate driver 22-2, for example, a display abnormality due to the disconnection of the scanning line SCL can be detected.
The embodiments are not limited to the above. The components of the above embodiments include components that can be easily conceived by those skilled in the art, substantially the same components, and so-called equivalent ranges. Various omissions, substitutions, and changes in the components can be made without departing from the spirit of the embodiments described above.
Claims (4)
1. A display device is characterized by comprising:
a plurality of pixels arranged in a matrix in the display region;
a scanning line connected to each of the pixels arranged in one direction in the display region and configured to supply a scanning signal to the scanning line;
a 1 st gate driver for supplying the scan signal from one end of the scan line;
a 2 nd gate driver for supplying the scan signal from the other end of the scan line; and
a display control circuit that controls display of a picture in the display area,
the display control circuit floats one end or the other end of the scanning line in the inspection process, and performs lighting display of all pixels in the display area.
2. The display device according to claim 1,
the display control circuit performs lighting display of all pixels in the display area in a state where one end of the scanning line is floating and the other end of the scanning line is floating in the inspection process.
3. The display device according to claim 2,
has an inspection terminal to which an inspection device is connected in the inspection step,
a switch control signal for floating at least one end or the other end of the scanning line is input from the inspection device through the inspection terminal.
4. A method for inspecting a display device, wherein the display device comprises: a plurality of pixels arranged in a matrix in the display region; a scanning line connected to each of the pixels arranged in one direction in the display region and configured to supply a scanning signal to the scanning line; a 1 st gate driver for supplying the scan signal from one end of the scan line; and a 2 nd gate driver supplying the scan signal from the other end of the scan line,
the detection method of the display device is characterized by comprising the following steps:
a step of floating one end of the scanning line to display all pixels of the display area; and
and a step of floating the other end of the scanning line to display all pixels of the display area in a lit state.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019170893A JP2021047336A (en) | 2019-09-19 | 2019-09-19 | Display device and inspection method of display device |
| JP2019-170893 | 2019-09-19 |
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| CN112530330A true CN112530330A (en) | 2021-03-19 |
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| CN202010969390.9A Pending CN112530330A (en) | 2019-09-19 | 2020-09-15 | Display device and method for inspecting display device |
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| CN (1) | CN112530330A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1097203A (en) * | 1996-06-10 | 1998-04-14 | Toshiba Corp | Display device |
| CN101114005A (en) * | 2006-07-28 | 2008-01-30 | 三星电子株式会社 | Module and method for detecting defect of thin film transistor substrate |
| CN101866606A (en) * | 2009-04-14 | 2010-10-20 | Nec液晶技术株式会社 | Scan line drive circuit, display device and scanning line driving method |
| CN207458545U (en) * | 2017-11-23 | 2018-06-05 | 昆山龙腾光电有限公司 | A kind of display panel and display device |
-
2019
- 2019-09-19 JP JP2019170893A patent/JP2021047336A/en active Pending
-
2020
- 2020-09-15 CN CN202010969390.9A patent/CN112530330A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1097203A (en) * | 1996-06-10 | 1998-04-14 | Toshiba Corp | Display device |
| CN101114005A (en) * | 2006-07-28 | 2008-01-30 | 三星电子株式会社 | Module and method for detecting defect of thin film transistor substrate |
| CN101866606A (en) * | 2009-04-14 | 2010-10-20 | Nec液晶技术株式会社 | Scan line drive circuit, display device and scanning line driving method |
| CN207458545U (en) * | 2017-11-23 | 2018-06-05 | 昆山龙腾光电有限公司 | A kind of display panel and display device |
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| JP2021047336A (en) | 2021-03-25 |
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