CN106228923B - A kind of driving circuit, driving method and display panel - Google Patents
A kind of driving circuit, driving method and display panel Download PDFInfo
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- CN106228923B CN106228923B CN201610627187.7A CN201610627187A CN106228923B CN 106228923 B CN106228923 B CN 106228923B CN 201610627187 A CN201610627187 A CN 201610627187A CN 106228923 B CN106228923 B CN 106228923B
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- 238000002834 transmittance Methods 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 2
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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
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Abstract
The invention discloses a kind of driving circuit, driving method and display panels, in normal displaying mode, data-signal can be output to each data line, realize the normal display of display panel by the data-signal that control module output normal driving display panel is shown, output module；In test pattern, the external power supply signal for being used to test is output to output module by control module, and then the power supply signal for being used to test is input to each data line by output module, realizes driving voltage-brightness test of display panel.In addition, the method that the present invention realizes test does not need to tear the flip chip at data access end and cause to destroy test sample compared with conventional test methodologies；And arbitrary point on display panel can be tested, it is not limited in traditional test mode that the corresponding region of incoming end for tearing flip chip can only be tested, subsequent bad analysis can also be normally shown and carried out after the completion of test, improve the accuracy of failure analysis and save testing cost.
Description
Technical Field
The invention relates to the technical field of display, in particular to a driving circuit, a driving method and a display panel.
Background
In the prior art, generally, the driving voltage for driving the display panel is changed, and the brightness of the display panel corresponding to each driving voltage is collected, so as to obtain a corresponding relationship curve between the driving voltage and the brightness of the display panel, that is, a voltage-brightness test is performed on the display panel, and then a voltage-transmittance characteristic curve of the display panel can be obtained. In the prior art, when a voltage-transmittance characteristic test is performed on a display panel, a data voltage signal (i.e., a driving voltage signal for performing the test) needs to be provided by an external power supply, specifically, as shown in fig. 1, by tearing off a flip-chip film at a data access end M on the display panel and then coating a silver paste lead-out wire at the access end where the film is torn off, an external dc power supply can provide an ac or dc driving voltage signal to the display panel. And only the area corresponding to the data access end with the film torn off can be tested during testing, and after the testing is finished, the sample is damaged and cannot be reused, and subsequent analysis work and use cannot be continued, so that waste is caused, and the testing cost is also increased.
Therefore, how to implement the test of the voltage-transmittance characteristic curve of the display panel without damaging the test sample is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a driving circuit, a driving method and a display panel, which are used for realizing the test of a voltage-transmittance characteristic curve of the display panel on the premise of not damaging a test sample.
An embodiment of the present invention provides a driving circuit, including: the device comprises a switching module, a control module and an output module; wherein,
the switching module is connected between the first power supply signal end and the second power supply signal end; the switching module is used for inputting a switching signal for controlling the control module to switch between a display mode and a test mode to the control module;
the control module is used for inputting a first control signal and a data signal for display to the output module when receiving a switching signal for switching into a display mode; when receiving a switching signal for switching to a test mode, inputting a second control signal and a data signal for testing to the output module; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply;
the output module is used for inputting data signals for display to each data line when the first control signals are received; and inputting a data signal for testing to each data line when the second control signal is received.
In a possible implementation manner, in the above driving circuit provided by an embodiment of the present invention, the control module is further configured to:
and when receiving a switching signal for switching into a test mode, accessing an external power supply signal for testing through the test voltage access point.
In a possible implementation manner, in the above driving circuit provided by an embodiment of the present invention, the control module is further configured to: a scan signal and a common voltage signal for driving the display panel to display are provided.
In a possible implementation manner, in the driving circuit provided in an embodiment of the present invention, the switching module includes: a first resistor and a second resistor; wherein,
one end of the first resistor is electrically connected with the first power signal, and the other end of the first resistor is electrically connected with one end and the output end of the second resistor respectively; the other end of the second resistor is electrically connected with the second power supply signal end; when the first resistor is disconnected from the second resistor, the output end is used for inputting a switching signal for switching to a display mode to the control module; when the first resistor is connected with the second resistor, the output end is used for inputting a switching signal for switching to a test mode to the control module.
In a possible implementation manner, in the foregoing driving circuit provided by the embodiment of the present invention, the control module is a clock controller.
In a possible implementation manner, in the driving circuit provided in an embodiment of the present invention, the output module is a source driver chip.
The embodiment of the invention provides a display panel, which comprises the driving circuit provided by the embodiment of the invention.
An embodiment of the present invention provides a driving method of the driving circuit provided in the embodiment of the present invention, including:
when the switching module inputs a switching signal for switching into a display mode to the control module, the control module inputs a first control signal and a data signal for display to the output module; the output module inputs data signals for display to each data line when receiving the first control signal;
when the switching module inputs a switching signal for switching into a test mode to the control module, the control module inputs a second control signal and a data signal for testing to the output module; the output module inputs a data signal for testing to each data line when receiving the second control signal; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a driving circuit, a driving method and a display panel, wherein the driving circuit comprises: the device comprises a switching module, a control module and an output module; the switching module is connected between the first power supply signal end and the second power supply signal end; the switching module is used for inputting a switching signal for controlling the control module to switch the display mode and the test mode to the control module; the control module is used for inputting a first control signal and a data signal for display to the output module when receiving a switching signal for switching into a display mode; when receiving a switching signal for switching into a test mode, inputting a second control signal and a data signal for testing to the output module; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply; the output module is used for inputting data signals for display to each data line when receiving the first control signal; when receiving the second control signal, a data signal for testing is input to each data line.
Specifically, the driving circuit provided in the embodiment of the present invention can control the switching between the display mode and the test mode through the switching module. In the normal display mode, the control module outputs data signals for normally driving the display panel to display, and the output module can output the data signals to each data line to realize the normal display of the display panel; in the test mode, the control module outputs an external power supply signal for testing to the output module, and then the output module inputs the power supply signal for testing to each data line, so that the test of the driving voltage-brightness of the display panel is realized. In addition, compared with the traditional test method, the method for realizing the test of the driving circuit provided by the embodiment of the invention does not need to tear off the flip chip film at the data access end to damage the test sample; any point on the display panel can be tested, the method is not limited to the traditional test mode that only the area corresponding to the access end of the chip on film is torn off, and the method is more favorable for poor analysis; after the test is finished, the result can be normally displayed and subsequent failure analysis can be carried out, the accuracy of failure analysis is improved, and the test cost is saved.
Drawings
FIG. 1 is a schematic diagram of a prior art display panel with an external test power supply;
fig. 2 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an external test power supply of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an external test AC power signal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an external test DC power signal according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a source driver chip according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of a driving circuit, a driving method, and a display panel according to embodiments of the present invention with reference to the accompanying drawings.
An embodiment of the present invention provides a driving circuit, as shown in fig. 2, which may include: the device comprises a switching module 01, a control module 02 and an output module 03; wherein,
the switching module 01 is connected between a first power signal terminal VDD and a second power signal terminal GND; the switching module 01 is configured to input a switching signal for controlling the control module 02 to switch between the display mode and the test mode to the control module 02;
the control module 02 is configured to input a first control signal and a data signal for display to the output module 03 when receiving a switching signal for switching to the display mode; when receiving a switching signal for switching to the test mode, the output module 03 is input with a second control signal and a data signal for testing; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply;
the output module 03 is configured to input a data signal for display to each data line when receiving the first control signal; when receiving the second control signal, a data signal for testing is input to each data line.
The driving circuit provided by the embodiment of the invention can realize the switching between the control display mode and the test mode through the switching module. In the normal display mode, the control module outputs data signals for normally driving the display panel to display, and the output module can output the data signals to each data line to realize the normal display of the display panel; in the test mode, the control module outputs an external power supply signal for testing to the output module, and then the output module inputs the power supply signal for testing to each data line, so that the test of the driving voltage-brightness of the display panel is realized. In addition, compared with the traditional test method, the method for realizing the test of the driving circuit provided by the embodiment of the invention does not need to tear off the flip chip film at the data access end to damage the test sample; any point on the display panel can be tested, the method is not limited to the traditional test mode that only the area corresponding to the access end of the chip on film is torn off, and the method is more favorable for poor analysis; after the test is finished, the result can be normally displayed and subsequent failure analysis can be carried out, the accuracy of failure analysis is improved, and the test cost is saved.
In a specific implementation, in the driving circuit provided in the embodiment of the present invention, the control module may further be configured to: and when receiving a switching signal for switching into a test mode, accessing an external power supply signal for testing through the test voltage access point. Specifically, when the driving circuit provided in the embodiment of the present invention is tested, as shown in fig. 3, the control module may access an external power signal for testing through the test voltage access point P, so as to output the external power signal to each data line through the output module, thereby driving the display panel to display under the driving of the test driving voltage, and obtaining the display brightness of the display panel corresponding to the driving voltage. In addition, the external power signal accessed by the control module through the test voltage access point may be an ac power signal, as shown in fig. 4, or a dc power signal, as shown in fig. 5. The voltage value of the direct current power supply signal or the alternating current power supply signal meets the Gamma voltage range, namely, the external test voltage for testing can replace the Gamma voltage to drive the display panel to display when testing.
In a specific implementation, in the driving circuit provided in the embodiment of the present invention, the control module may further be configured to: a scan signal and a common voltage signal for driving the display panel to display are provided. Specifically, in the driving circuit provided in the embodiment of the present invention, the control module needs to provide control signals, such as a scan signal and a common voltage signal, for driving the display panel to perform display in both of the two operating modes, so as to implement normal display of the display panel in the two operating modes.
In a specific implementation, as shown in fig. 6, in the driving circuit provided in the embodiment of the present invention, the switching module may include: a first resistor R1 and a second resistor R2; one end of the first resistor R1 is electrically connected to the first power signal VDD, and the other end is electrically connected to one end of the second resistor R2 and the output end Out, respectively; the output end Out is used for inputting a switching signal to the control module 02; the other end of the second resistor R2 is electrically connected to the second power signal terminal GND.
Specifically, the switching module may implement the function of outputting the switching signal through two resistors, where a resistance of the first resistor R1 may be 1 to 10K Ω, and a resistance of the second resistor R2 may be 0. When the first resistor R1 is 4.7K Ω and the second resistor R2 is in an off state, the output terminal Out may output a high level signal to the control module, so that the control module may operate in a normal display mode, and at this time, the control module may output a data signal, a common voltage signal, and a scan signal for driving the display panel to normally display; when the first resistor R1 is 4.7K Ω, and the second resistor R2 is 0 Ω (i.e., the second resistor R2 is in a connected state (or R1 is in a disconnected state, and R2 is 4.7K Ω), the output terminal Out may output a low level signal to the control module, so that the control module operates in a test mode, and at this time, the control module outputs an external power signal as a data signal for testing the display panel, and normally outputs a common voltage signal and a scan signal for driving the display panel to display.
In a specific implementation, as shown in fig. 6, in the driving circuit provided in the embodiment of the present invention, the control module may be a clock controller, and the output module may be a source driver chip. The schematic structural diagram of the source driver chip is shown in fig. 7, and in order to implement that the source driver chip completes corresponding functions in the display mode and the test mode, two signal input ports are added compared with the prior art, one is a test voltage input port Vtest, and the other is a control signal port Operation for controlling mode switching; the working principle of other ports of the source driver chip and the modules including the buffer module, the digital-to-analog conversion module, the latch module, the shift register, the data register, the level conversion module, the low-voltage differential signal receiver and the like are the same as those of the prior art, and detailed description is omitted here.
Specifically, when receiving a switching signal which is output by the switching module and is switched into a display mode, the clock controller enters a normal display working mode, inputs a high-level control signal to a control signal end Operation of the source driving chip, so that the source driving chip works in the normal working mode for normally driving the display panel to display, receives a clock signal output by the clock controller and Data signal Data for driving the display panel to normally display at the same time, and outputs the Data signal to each Data line of the display panel by the source driving chip to realize normal display of the display panel; when receiving a switching signal which is output by the switching module and is switched into a test mode, the clock controller enters a test working mode, a low-level control signal is input to a control signal end Operation of the source driving chip, so that the source driving chip also enters the test working mode, an external power supply signal for testing is accessed by the clock controller through a test voltage access point, a test voltage is output to a test voltage input end Vtest of the source driving chip, and meanwhile, the source driving chip also receives a clock signal, a control signal and the like which are output by the clock controller and are required for testing. The test voltage is a plurality of fixed values, the fixed values are used as drive voltages and are output to the data lines through the source drive chip, the brightness of the display panel can change along with the change of the voltage value of the test voltage, and finally the test of the drive voltage-brightness characteristic curve of the display panel is realized. After the test is finished, the signal at the output end of the switching module is switched to a switching signal for controlling the clock controller to carry out a normal display working mode, so that the display panel is switched to the normal display mode, and the subsequent bad analysis is facilitated.
Based on the same inventive concept, an embodiment of the present invention provides a display panel including the driving circuit provided in the embodiment of the present invention. The display panel can be applied to any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Since the principle of the display panel to solve the problem is similar to that of the driving circuit, the implementation of the display panel can refer to the implementation of the driving circuit, and repeated descriptions are omitted.
Based on the same inventive concept, an embodiment of the present invention provides a driving method of the driving circuit, which includes:
when the switching module inputs a switching signal for switching into a display mode to the control module, the control module inputs a first control signal and a data signal for display to the output module; the output module inputs data signals for display to each data line when receiving the first control signal;
when the switching module inputs a switching signal for switching into a test mode to the control module, the control module inputs a second control signal and a data signal for testing to the output module; the output module inputs a data signal for testing to each data line when receiving the second control signal; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply.
According to the driving method provided by the embodiment of the invention, in the normal display mode, the control module outputs the data signals for normally driving the display panel to display, and the output module can output the data signals to each data line to realize the normal display of the display panel; in the test mode, the control module outputs an external power supply signal for testing to the output module, and then the output module inputs the power supply signal for testing to each data line, so that the test of the driving voltage and the brightness of the display panel is realized. In addition, compared with the traditional test method, the method for realizing the test of the driving circuit provided by the embodiment of the invention does not need to tear off the flip chip film at the data access end to damage the test sample; any point on the display panel can be tested, the method is not limited to the traditional test mode that only the area corresponding to the access end of the chip on film is torn off, and the method is more favorable for poor analysis; after the test is finished, the result can be normally displayed and subsequent failure analysis can be carried out, the accuracy of failure analysis is improved, and the test cost is saved.
The embodiment of the invention provides a driving circuit, a driving method and a display panel, wherein the driving circuit comprises: the device comprises a switching module, a control module and an output module; the switching module is connected between the first power supply signal end and the second power supply signal end; the switching module is used for inputting a switching signal for controlling the control module to switch the display mode and the test mode to the control module; the control module is used for inputting a first control signal and a data signal for display to the output module when receiving a switching signal for switching into a display mode; when receiving a switching signal for switching into a test mode, inputting a second control signal and a data signal for testing to the output module; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply; the output module is used for inputting data signals for display to each data line when receiving the first control signal; when receiving the second control signal, a data signal for testing is input to each data line.
Specifically, the driving circuit provided in the embodiment of the present invention can control the switching between the display mode and the test mode through the switching module. In the normal display mode, the control module outputs data signals for normally driving the display panel to display, and the output module can output the data signals to each data line to realize the normal display of the display panel; in the test mode, the control module outputs an external power supply signal for testing to the output module, and then the output module inputs the power supply signal for testing to each data line, so that the test of the driving voltage and the brightness of the display panel is realized. In addition, compared with the traditional test method, the method for realizing the test of the driving circuit provided by the embodiment of the invention does not need to tear off the flip chip film at the data access end to damage the test sample; any point on the display panel can be tested, the method is not limited to the traditional test mode that only the area corresponding to the access end of the chip on film is torn off, and the method is more favorable for poor analysis; after the test is finished, the result can be normally displayed and subsequent failure analysis can be carried out, the accuracy of failure analysis is improved, and the test cost is saved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A driver circuit, comprising: the device comprises a switching module, a control module and an output module; wherein,
the switching module is connected between the first power supply signal end and the second power supply signal end; the switching module is used for inputting a switching signal for controlling the control module to switch between a display mode and a test mode to the control module;
the control module is used for inputting a first control signal and a data signal for display to the output module when receiving a switching signal for switching into a display mode; when receiving a switching signal for switching to a test mode, inputting a second control signal and a data signal for testing to the output module; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply;
the output module is used for inputting data signals for display to each data line when the first control signals are received; inputting a data signal for testing to each of the data lines when the second control signal is received;
the switching module includes: a first resistor and a second resistor; wherein,
one end of the first resistor is electrically connected with the first power signal, and the other end of the first resistor is electrically connected with one end and the output end of the second resistor respectively; the other end of the second resistor is electrically connected with the second power supply signal end; when the first resistor is disconnected from the second resistor, the output end is used for inputting a switching signal for switching to a display mode to the control module; when the first resistor is connected with the second resistor, the output end is used for inputting a switching signal for switching to a test mode to the control module.
2. The drive circuit of claim 1, wherein the control module is further configured to:
and when receiving a switching signal for switching into a test mode, accessing an external power supply signal for testing through the test voltage access point.
3. The drive circuit of claim 1, wherein the control module is further configured to: a scan signal and a common voltage signal for driving the display panel to display are provided.
4. A drive circuit as claimed in any one of claims 1 to 3, wherein the control module is a clock controller.
5. The driver circuit according to any of claims 1 to 3, wherein the output module is a source driver chip.
6. A display panel comprising the driver circuit according to any one of claims 1 to 5.
7. A driving method of the driving circuit according to any one of claims 1 to 5, comprising:
when the switching module inputs a switching signal for switching into a display mode to the control module, the control module inputs a first control signal and a data signal for display to the output module; the output module inputs data signals for display to each data line when receiving the first control signal;
when the switching module inputs a switching signal for switching into a test mode to the control module, the control module inputs a second control signal and a data signal for testing to the output module; the output module inputs a data signal for testing to each data line when receiving the second control signal; the data signal used for testing is a direct current voltage signal or an alternating current voltage signal of an external power supply.
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| CN106504687B (en) * | 2016-12-16 | 2018-04-03 | 惠科股份有限公司 | Display panel detection method and display panel detection system |
| CN107038985B (en) * | 2017-06-02 | 2020-04-03 | 京东方科技集团股份有限公司 | Driving module for display panel, display panel and display device |
| CN110875001A (en) * | 2019-11-29 | 2020-03-10 | 京东方科技集团股份有限公司 | Test circuit, display substrate, display panel and test method |
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| JP2001282164A (en) * | 2000-03-31 | 2001-10-12 | Sanyo Electric Co Ltd | Driving device for display device |
| US8427073B2 (en) * | 2009-05-27 | 2013-04-23 | Green Solution Technology Co., Ltd. | LED driving circuit and backlight module |
| TWI506607B (en) * | 2011-04-14 | 2015-11-01 | Novatek Microelectronics Corp | Controller driver for driving display panel |
| KR101860739B1 (en) * | 2011-05-18 | 2018-05-25 | 삼성디스플레이 주식회사 | Supply voltage converter, display device including the same and method of controlling driving voltage |
| US9218756B2 (en) * | 2013-07-05 | 2015-12-22 | Infineon Technologies Ag | Test system for semiconductor array |
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