CN114047458A - Display panel, VT testing method of display panel and display device - Google Patents
Display panel, VT testing method of display panel and display device Download PDFInfo
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- CN114047458A CN114047458A CN202111281670.1A CN202111281670A CN114047458A CN 114047458 A CN114047458 A CN 114047458A CN 202111281670 A CN202111281670 A CN 202111281670A CN 114047458 A CN114047458 A CN 114047458A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
Abstract
The embodiment of the invention discloses a display panel, a VT testing method of the display panel and a display device. The display panel includes: the system comprises a plurality of sub-pixels arranged in an array and a plurality of fingerprint identification units arranged in an array; a plurality of data lines, one of which is connected to one of the rows or one of the columns of the sub-pixels; the test circuit comprises a plurality of first switch units and a plurality of first test lines, wherein the control end of each first switch unit is connected with a first control signal end, the first end of each first switch unit is connected with the output end of the fingerprint identification unit, the second end of each first switch unit is connected with the first end of at least one first test line, and the second end of each first test line is connected with at least one data line. And testing the fingerprint identification unit according to the display picture during testing. The embodiment of the invention realizes the fingerprint identification unit test before the display panel bonds the integrated circuit chip. The display panel can only be discarded together with the integrated circuit chip bonded on the screen when the display panel needs to be scrapped.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to a display panel, a VT testing method for the display panel, and a display device.
Background
In the prior art, for the detection mode of the on-screen optical sensing circuit, a mode of detecting the on-screen optical sensing circuit after Bonding an integrated circuit chip on a display screen is adopted. In this way, it is possible to detect that the light sensing circuit in the display screen has a problem, so that the light sensing circuit is discarded together with the integrated circuit chip bonded to the screen only when the light sensing circuit is scrapped due to a failure. Resulting in a large amount of waste and also in higher production costs.
Disclosure of Invention
The embodiment of the invention provides a display panel, a VT test method of the display panel and a display device, which are used for realizing the fingerprint identification unit test before a display panel is bonded with an integrated circuit chip. The problem that the display panel is scrapped due to the fact that the fingerprint identification unit has a problem is avoided, and the display panel and the integrated circuit chip bonded on the screen can be discarded together. The problem of integrated circuit chip waste is solved, and meanwhile, the production cost is also reduced.
In a first aspect, an embodiment of the present invention provides a display panel, including:
the system comprises a plurality of sub-pixels arranged in an array and a plurality of fingerprint identification units arranged in an array;
a plurality of data lines, one of the data lines being connected to one of the sub-pixels in a row or a column;
the test circuit comprises a plurality of first switch units and a plurality of first test lines, wherein the control end of each first switch unit is connected with a first control signal end, the first end of each first switch unit is connected with the output end of the fingerprint identification unit, the second end of each first switch unit is connected with the first end of at least one first test line, and the second end of each first test line is connected with at least one data line;
in the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit, the first control signal end controls the first switch unit to be conducted, a voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first testing line, and the fingerprint identification unit is tested according to the display picture of the display panel.
In a second aspect, an embodiment of the present invention further provides a VT testing method for a display panel, which is applicable to any one of the display panels, where the VT testing method includes:
applying an illumination signal to the fingerprint identification unit;
the first control signal end controls the first switch unit to be conducted, and the voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first test line;
and testing the fingerprint identification unit according to the display picture of the display panel.
In a third aspect, an embodiment of the present invention further provides a display device, including any one of the display panels described above.
In an embodiment of the present invention, a display panel includes: the system comprises a plurality of sub-pixels arranged in an array and a plurality of fingerprint identification units arranged in an array; a plurality of data lines, one of which is connected to one of the rows or one of the columns of the sub-pixels; the test circuit comprises a plurality of first switch units and a plurality of first test lines, wherein the control end of each first switch unit is connected with the first control signal end, the first end of each first switch unit is connected with the output end of the fingerprint identification unit, the second end of each first switch unit is connected with the first end of at least one first test line, and the second end of each first test line is connected with at least one data line; in the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit, the first control signal end controls the first switch unit to be conducted, a voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first testing line, and the fingerprint identification unit is tested according to the display picture of the display panel. Therefore, whether the fingerprint identification unit normally works or not can be visually judged according to the display picture of the display panel. The fingerprint identification unit test is carried out before the display panel is bonded with the integrated circuit chip. The problem that the display panel is scrapped due to the fact that the fingerprint identification unit has a problem is avoided, and the display panel and the integrated circuit chip bonded on the screen can be discarded together. The problem of integrated circuit chip waste is solved, and meanwhile, the production cost is also reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a portion of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention;
FIG. 7 is a flowchart of a VT testing method for a display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the prior art, the detection of the light sensing fingerprint identification display panel often includes a display panel visualization test (VT test) and a fingerprint identification unit test. For the fingerprint identification unit test, after the integrated circuit chip for processing the output signal of the fingerprint identification unit is bonded to the display panel, the display panel is irradiated and the like, and the fingerprint identification signal processed by the integrated circuit chip is received. Therefore, whether the fingerprint identification unit of the display panel is good or bad is judged, and the display panel which cannot be used by the fingerprint identification unit is detected and scrapped. However, since the ic chip for processing the output signal of the fingerprint recognition unit is already bonded to the display panel, the ic chip is discarded along with the scrapped display panel.
Fig. 1 is a schematic diagram of a portion of a circuit of a display panel according to an embodiment of the present invention, and fig. 1 is referred to. To solve the problems in the prior art, an embodiment of the present invention provides a display panel, including:
the system comprises a plurality of sub-pixels arranged in an array and a plurality of fingerprint identification units arranged in an array;
a plurality of data lines 1, one data line 1 is connected with one row or one column of sub-pixels;
the test circuit comprises a plurality of first switch units 2 and a plurality of first test lines 3, wherein the control end of each first switch unit 2 is connected with a first control signal end VTSSSW, the first end of each first switch unit 2 is connected with the output end of the fingerprint identification unit 4, the second end of each first switch unit 2 is connected with the first end of at least one first test line 3, and the second end of each first test line 3 is connected with at least one data line 1;
in the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit 4, the first control signal end VTSSSW controls the first switch unit 2 to be conducted, a voltage signal output by the fingerprint identification unit 4 is transmitted to the corresponding data line 1 through the first testing line 3, and the fingerprint identification unit 4 is tested according to the display picture of the display panel.
The fingerprint identification units 4 may be disposed between the sub-pixels, and the number of the fingerprint identification units 4 may be greater than the number of the sub-pixels, may be less than the number of the sub-pixels, or may be the same as the number of the sub-pixels. When the fingerprint recognition units 4 are less than the number of sub-pixels, the fingerprint recognition units 4 may be spaced apart by a plurality of sub-pixels. The fingerprint recognition unit 4 may be distributed over the entire area of the display panel or may be distributed over a specific area of the display panel. The fingerprint identification unit 4 may be any kind of fingerprint identification unit, and the embodiment of the present invention is not limited to the specific structure of the fingerprint identification unit. The first switching unit 2 may be any switching tube, and may be a transistor such as a thin film transistor, a triode, or a MOS tube.
In the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit 4 through external equipment, the fingerprint identification unit 4 obtains a corresponding voltage signal according to the intensity of the applied illumination signal, a first control signal end VTSSSW controls the first switch unit 2 to be conducted, the voltage signal output by the fingerprint identification unit 4 is transmitted to a data line 1 connected with the second end of the first test line 3 through the first switch unit 2 and the first test line 3, the voltage signal is transmitted to a sub-pixel connected with the data line 1 through the data line 1, and the sub-pixel determines the light-emitting brightness according to the voltage of the received voltage signal output by the fingerprint identification unit 4. Therefore, whether the corresponding fingerprint identification unit 4 is in a normal operation state can be determined according to the light emitting brightness of the corresponding area of the display panel. The voltage signal output by the fingerprint identification unit 4 can be adjusted to a certain range between the highest value of the voltage signal and the lowest value of the voltage signal that can be output by the fingerprint identification unit 4 by adjusting the intensity of the illumination signal. The luminance of the corresponding area of the display panel should be within the expected luminance range. If the brightness of the light emitted by the corresponding area of the display panel is in the expected brightness range, the fingerprint identification unit 4 is indicated to work normally. In the normal working state of the fingerprint identification unit 4, the resistance value of the photodiode changes along with the intensity change of the illumination signal, and the higher the resistance value of the photodiode is, the higher the voltage output by the fingerprint identification unit is. Therefore, in a normal working state, the fingerprint identification unit 4 can control the voltage signal output by the fingerprint identification unit within a certain expected voltage range between the highest value of the voltage signal and the lowest value of the voltage signal (excluding the highest value of the voltage signal and the lowest value of the voltage signal) by adjusting the intensity of the illumination signal. Therefore, the light emitting brightness of the corresponding area of the display panel should be within the expected brightness range in the normal operation state of the fingerprint identification unit 4. If the light-emitting brightness of the corresponding area of the display panel is higher or lower than the expected brightness range due to the internal circuit failure of the fingerprint identification unit 4, the fingerprint identification unit 4 is not operated normally. The internal circuit failure of the fingerprint recognition unit 4 may be a short circuit or an open circuit. When the power supply terminal VDD of the fingerprint identification unit 4 is short-circuited with the output terminal of the fingerprint identification unit 4, the voltage of the voltage signal output by the fingerprint identification unit 4 is the highest, and the luminance of the sub-pixel is the highest under the highest voltage signal. When the ground terminal of the fingerprint identification unit 4 is short-circuited with the output terminal of the fingerprint identification unit 4, the voltage of the voltage signal output by the fingerprint identification unit 4 is the lowest, and the luminance of the sub-pixel is the lowest or even no light is emitted under the lowest voltage signal. When the power supply terminal VDD of the fingerprint identification unit 4 is disconnected from the output terminal of the fingerprint identification unit 4, the voltage of the voltage signal output by the fingerprint identification unit 4 is the lowest, and the luminance of the sub-pixel is the lowest or even no light is emitted under the lowest voltage signal. When the ground terminal of the fingerprint identification unit 4 is disconnected from the output terminal of the fingerprint identification unit 4, the voltage of the voltage signal output by the fingerprint identification unit 4 is the highest, and the luminance of the sub-pixel is the highest under the highest voltage signal. Therefore, when the fingerprint identification unit 4 is not working normally, the light emitting brightness of the corresponding area of the display panel is not in the expected brightness range. The working state of the fingerprint identification unit is determined through the visual representation mode, so that the working state of the fingerprint identification unit 4 can be simply and conveniently judged, the difficulty in judging the working state of the fingerprint identification unit is reduced, and the working efficiency of inspection personnel is improved. The detection mode can be carried out before the integrated circuit chip of the fingerprint identification unit is bonded, and the situation that the integrated circuit chip bonded on the screen can only be discarded together with the display panel when the display panel needs to be scrapped due to the fact that the fingerprint identification unit has problems can be avoided. The problem of integrated circuit chip waste is solved, and meanwhile, the production cost is also reduced.
Fig. 2 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention, and fig. 2 is referred to. Optionally, the data line 1 includes a first data line 11 and a second data line 12 arranged at an interval;
a second end of the first test line 3 is connected to at least one first data line 11 or second data line 12.
The second end of the first test line 3 may be connected to only the at least one first data line 11, or may be connected to only the at least one second data line 12.
Fig. 3 is a schematic diagram of a portion of a circuit of another display panel according to an embodiment of the present invention, and fig. 3 is referred to. Furthermore, the sub-pixels comprise sub-pixels with various light emitting colors, and the light emitting colors of the sub-pixels connected with the same data line are the same;
the second end of the first test line 3 is connected with a plurality of adjacent first data lines 11, and the light emitting colors of the sub-pixels corresponding to different first data lines 11 are different; or
The second end of the first testing line 3 is connected with a plurality of adjacent second data lines 12, and the sub-pixels corresponding to different second data lines 12 have different light emitting colors.
Among them, the sub-pixels may include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. The data line 1 can be connected with a plurality of red sub-pixels, or a plurality of green sub-pixels through the data line 1, and a plurality of blue sub-pixels through the data line 1. The first data lines 11 may be sequentially and cyclically arranged according to the connected sub-pixel colors, for example, the arrangement manner of the first data lines 11 may be cyclically arranged in the order of the red sub-pixel first data line 11, the blue sub-pixel first data line 11, and the green sub-pixel first data line 11. The second ends of the first test lines 3 may be connected to a plurality of adjacent three kinds of the first data lines 11, and no first data line 11 of the same kind is connected to the second end of the same first test line 3. For example, the second end of one first test line 3 may be connected to the adjacent red, blue, and green sub-pixel first data lines 11, and 11, respectively. When the voltage signal output by the fingerprint identification unit 4 is transmitted to the red light sub-pixel first data line 11, the blue light sub-pixel first data line 11 and the green light sub-pixel first data line 11 through the first test line 3, the sub-pixels of the three light-emitting colors can simultaneously emit light with brightness corresponding to the voltage signal output by the fingerprint identification unit 4, and because the distances among the adjacent red light sub-pixel first data line 11, the blue light sub-pixel first data line 11 and the green light sub-pixel first data line 11 are relatively short, the actual light-emitting effect of the display panel is equivalent to that a pixel formed by combining the red light sub-pixel, the blue light sub-pixel and the blue light sub-pixel emits white light. The brightness of the white light, i.e., the gray scale of the light, corresponds to the voltage signal output from the fingerprint recognition unit 4. Whether the fingerprint identification unit 4 normally works can be distinguished by identifying the gray scale of the specific pixel, and the difficulty of distinguishing whether the fingerprint identification unit normally works is further reduced. The technical scheme that the second end of the first test line 3 is connected with the plurality of adjacent second data lines 12 has the same design concept as the technical scheme that the second end of the first test line 3 is connected with the plurality of adjacent first data lines 11, and therefore, the technical scheme that the second end of the first test line 3 is connected with the plurality of adjacent second data lines 12 is not described herein again.
Fig. 4 is a schematic circuit diagram of a portion of another display panel according to an embodiment of the present invention, and fig. 4 is referred to. Further, the test device further comprises a plurality of second switch units 5, wherein the second end of the first test line 3 is connected with the first data line 11 through the second switch units, or the second end of the first test line 3 is connected with the second data line 12 through the second switch units.
The second switch unit may be any switch tube, and may be a transistor such as a thin film transistor, a triode, or a MOS transistor, for example. The second switching unit may turn on the first data line 11 or the second data line 12 corresponding to the second switching unit as needed. The turning on and off of the second switch unit may be controlled by a plurality of data line control signal terminals CKHR, CKHG, and CKHB connected to the control terminal of the second switch unit, for example. In the testing phase of the fingerprint identification unit, part or all of the first data lines 11 may be gated, or part or all of the second data lines 12 may be gated, by controlling the second switching unit to be turned on or off. For example, when the fingerprint identification unit 4 can be tested by only turning on the green sub-pixel first data line 11, only the second switch unit connected to the green sub-pixel first data line 11 may be turned on, and the second switch unit connected to the red sub-pixel first data line 11 and the second switch unit connected to the blue sub-pixel first data line 11 may be turned off. And judging whether the fingerprint identification unit 4 normally works or not according to the light-emitting brightness of the green sub-pixel. If the fingerprint identification unit 4 needs to be judged by the gray scale of the display panel, the second switch unit connected with the first data line 11 of the red sub-pixel, the second switch unit connected with the first data line 11 of the green sub-pixel and the second switch unit connected with the first data line 11 of the blue sub-pixel can be simultaneously turned on. The sub-pixels of the three light-emitting colors are mixed to form white light, and whether the fingerprint identification unit 4 works normally or not is judged through the gray scale of the corresponding area of the display panel. When the display test is performed on the sub-pixels of the display panel, the sub-pixels with specific colors can be selected according to the test requirements for performing the display test. For example, the second switch unit connected to the red sub-pixel first data line 11, the second switch unit connected to the green sub-pixel first data line 11, and the second switch unit connected to the blue sub-pixel first data line 11 may be turned on, respectively, so that the display panel displays red, green, and blue colors, respectively. To detect whether each sub-pixel works normally. Therefore, the second switch unit is arranged, so that the test flexibility of the fingerprint identification unit in the test stage and the sub-pixel display test stage is improved.
Fig. 5 is a schematic circuit diagram of a portion of another display panel according to an embodiment of the present invention, and fig. 5 is referred to. Optionally, the test circuit further includes a plurality of third switching units 6, a fourth switching unit 7, and a plurality of second test lines 8;
the control end of the third switching unit 6 is connected with the second control signal end VTDOSW, the first end of the third switching unit 6 is connected with the first display test end DO, and the second end of the third switching unit 6 is connected with the first end of the first test line 3;
the control end of the fourth switching unit 7 is connected with the third control signal end VTDESW, the first end of the fourth switching unit 7 is connected with the second display test end DE, the second end of the fourth switching unit 7 is connected with the first end of the second test line 8, and the second end of the second test line 8 is connected with at least one data line 1;
the data line 1 connected with the first test line 3 and the second test line 8 is different.
The third switching unit 6 or the fourth switching unit 7 may be any switching tube, and may be a transistor such as a thin film transistor, a triode, or an MOS tube, for example. The third switching unit 6 is used to control the turn-on and turn-off between the first test line 3 and the first display test terminal DO, and the fourth switching unit 7 is used to control the turn-on and turn-off between the second test line 8 and the second display test terminal DE. The first display test terminal DO is for supplying a first display test signal to the first test line 3, and the second display test terminal DE is for supplying a second display test signal to the second test line 8. The first test line 3 and the second test line 8 supply a display test signal to the sub-pixel through the data line, and the sub-pixel determines the light emitting luminance of the sub-pixel according to the display test signal.
With continued reference to fig. 5. Further, in the testing stage of the fingerprint identification unit, the third control signal terminal VTDESW controls the fourth switch unit 7 to be turned on, and the test voltage signal output by the second display test terminal DE is transmitted to the corresponding data line 1 through the second test line 8.
After the fourth switch unit 7 is turned on, the data line 1 connected to the second test signal line can receive the test voltage signal output from the second display test terminal DE. When the test of the fingerprint identification unit is performed, the sub-pixels on the data line 1 connected to the first test signal line may be compared with the sub-pixels on the data line 1 connected to the second test signal line. Because the test voltage signal is known and controllable, whether the fingerprint identification unit 4 is abnormal or not can be visually judged according to the comparison result of the comparison, and the judgment of the fingerprint identification unit 4 is further facilitated.
With continued reference to fig. 5. Further, the first test line 3 is connected with the odd data lines 1, and the second test line 8 is connected with the even data lines 1;
in the display test stage of the sub-pixels connected with the odd data lines 1, the first display test terminal DO outputs a first display test signal, the second control signal terminal VTDOSW controls the third switching unit 6 to be turned on, and the first display test signal is transmitted to the odd data lines 1 through the first test lines 3;
in the display test stage of the sub-pixels connected to the even number of data lines 1, the second display test terminal DE outputs a second display test signal, the third control signal terminal VTDESW controls the fourth switching unit 7 to be turned on, and the second display test signal is transmitted to the even number of data lines 1 through the second test line 8.
In the sub-pixel display test phase of the display panel, the first display test signal output from the first display test terminal DO may be transmitted to the odd sub-pixels through the third switching unit 6, the first test line 3 and the odd data lines 1. The second display test signal outputted from the second display test terminal DE is transmitted to the even-numbered sub-pixels through the fourth switching unit 7 and the second test line 8 and the even-numbered data lines 1. Thereby realizing the sub-pixel display test of the display panel. The technical scheme of the embodiment of the invention not only can realize the test of the fingerprint identification unit, but also can realize the sub-pixel display test of the display panel. The testing process of the fingerprint identification display panel is simplified.
Fig. 6 is a schematic circuit diagram of a portion of another display panel according to an embodiment of the present invention, and fig. 6 is referred to. Optionally, the second end of the first switch unit 2 is connected to the first ends of n first test lines 3, where n is a positive integer less than or equal to 3.
Wherein, the second end of the first switch unit 2 can be connected with the first ends of 1 to 3 first test lines 3. The specific number of the second ends of the first switch units 2 connected to the first test lines 3 can be determined according to actual needs.
Fig. 7 is a flowchart of a VT testing method of a display panel according to an embodiment of the present invention, referring to fig. 7. The embodiment of the invention also provides a VT test method of the display panel, which is suitable for any display panel, and the VT test method comprises the following steps:
s1: applying an illumination signal to the fingerprint identification unit;
s2: the first control signal end controls the first switch unit to be conducted, and the voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first test line;
s3: and testing the fingerprint identification unit according to the display picture of the display panel.
The fingerprint identification device comprises a fingerprint identification unit, a first control signal end, a second control signal end, a first switch unit, a second switch unit, a data line and a sub-pixel, wherein in the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit through external equipment, the fingerprint identification unit obtains a corresponding voltage signal according to the intensity of the applied illumination signal, the first control signal end controls the first switch unit to be switched on, the voltage signal output by the fingerprint identification unit is transmitted to the data line connected with the second end of the first test line through the first switch unit and the first test line, the data line transmits the sub-pixel to the data line, and the sub-pixel emits light with corresponding brightness according to the voltage of the received voltage signal output by the fingerprint identification unit. Therefore, whether the corresponding fingerprint identification unit is in a normal working state or not can be determined according to the light emitting brightness of the corresponding area of the display panel. The voltage signal output by the fingerprint identification unit can be adjusted to be between the highest value and the lowest value of the voltage signal which can be output by the fingerprint identification unit by adjusting the intensity of the illumination signal. The luminance of the corresponding area of the display panel should be within the expected luminance range. If the brightness of the light emitted by the corresponding area of the display panel is in the expected brightness range, the fingerprint identification unit works normally. If the light emitting brightness of the corresponding area of the display panel is higher or lower than the expected brightness range due to the internal circuit failure of the fingerprint identification unit, the fingerprint identification unit is abnormal in operation. The working state of the fingerprint identification unit is determined through the visual representation mode, so that the working state of the fingerprint identification unit can be simply and conveniently judged, the difficulty in judging the working state of the fingerprint identification unit is reduced, and the working efficiency of inspection personnel is improved. And the situation that the display panel is scrapped due to the problem of the fingerprint identification unit and only the integrated circuit chip bonded on the screen is discarded can be avoided. The problem of integrated circuit chip waste is solved, and meanwhile, the production cost is also reduced.
Further, the test circuit further comprises a plurality of third switch units, a fourth switch unit and a plurality of second test lines;
in the testing stage of the fingerprint identification unit, the third control signal end controls the fourth switch unit to be conducted, and the testing voltage signal output by the second display testing end is transmitted to the corresponding data line through the second testing line.
After the fourth switch unit is switched on, the data line connected with the second test signal line can receive the test voltage signal output from the second display test end. When the fingerprint identification unit is tested, the sub-pixels on the data line connected with the first test signal line can be compared with the sub-pixels on the data line connected with the second test signal line. Since the test voltage signal is known and controllable, the purpose of adjusting the reference brightness or the reference gray scale of the sub-pixels on the data line connected to the first test signal line can be achieved by adjusting the test voltage signal. And then judging whether the voltage signal output by the fingerprint identification unit is normal according to the brightness or the gray scale of the sub-pixels on the data line connected with the first test signal line, so as to determine whether the fingerprint identification unit is in a normal working state. The embodiment of the invention has the technical effects that whether the fingerprint identification unit is abnormal or not can be intuitively judged according to the comparison result of the comparison, and the judgment of the fingerprint identification unit is further facilitated.
Furthermore, the test voltage signal output by the second display test terminal comprises a voltage signal corresponding to 8-level gray scale.
The test voltage signal output by the second display test terminal comprises a voltage signal corresponding to 8-level gray scale, so that the gray scale of a pixel formed by sub-pixels on the display panel, wherein the sub-pixels are provided with data signals by the second display test terminal, comprises 8-level gray scale, and the gray scale of the pixel corresponds to the test voltage signal output by the second display test terminal. Therefore, the display area of the display panel, which is provided with the data signal by the second display test terminal, can be used as a reference for comparing with the display area of the voltage signal output by the fingerprint identification unit as the data signal. The gray scale of the display area used as reference can be adjusted as required, whether the gray scale of the display area using the voltage signal output by the fingerprint identification unit as the data signal is in a normal range or not is judged according to the gray scale of the display area used as reference, and whether the fingerprint identification unit can work normally or not is judged visually.
Furthermore, the first test line is connected with odd data lines, and the second test line is connected with even data lines;
in the display test stage of the sub-pixels connected with the odd data lines, the first display test end outputs a first display test signal, the second control signal end controls the third switch unit to be conducted, and the first display test signal is transmitted to the odd data lines through the first test line;
in the display test stage of the sub-pixels connected with the even number of data lines, the second display test end outputs a second display test signal, the third control signal end controls the fourth switch unit to be conducted, and the second display test signal is transmitted to the even number of data lines through the second test line.
In the sub-pixel display test stage of the display panel, the first display test signal output by the first display test terminal can be transmitted to the odd sub-pixels through the third switch unit, the first test line and the odd data lines. And transmitting a second display test signal output by the second display test end to the even-numbered sub-pixels through the fourth switch unit, the second test line and the even-numbered data lines. Thereby realizing the sub-pixel display test of the display panel. The technical scheme of the embodiment of the invention not only can realize the test of the fingerprint identification unit, but also can realize the sub-pixel display test of the display panel. The testing process of the fingerprint identification display panel is simplified.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and refer to fig. 8. The embodiment of the invention also discloses a display device 20 which comprises any one of the display panels 21.
Wherein, the display device uses any display panel in the embodiment of the present invention. The display device has advantageous effects corresponding to the display panel.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A display panel, comprising:
the system comprises a plurality of sub-pixels arranged in an array and a plurality of fingerprint identification units arranged in an array;
a plurality of data lines, one of the data lines being connected to one of the sub-pixels in a row or a column;
the test circuit comprises a plurality of first switch units and a plurality of first test lines, wherein the control end of each first switch unit is connected with a first control signal end, the first end of each first switch unit is connected with the output end of the fingerprint identification unit, the second end of each first switch unit is connected with the first end of at least one first test line, and the second end of each first test line is connected with at least one data line;
in the testing stage of the fingerprint identification unit, an illumination signal is applied to the fingerprint identification unit, the first control signal end controls the first switch unit to be conducted, a voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first testing line, and the fingerprint identification unit is tested according to the display picture of the display panel.
2. The display panel according to claim 1, wherein the data lines include first data lines and second data lines arranged at intervals;
and the second end of the first test line is connected with at least one first data line or second data line.
3. The display panel according to claim 2, wherein the sub-pixels comprise sub-pixels with a plurality of light emission colors, and the light emission colors of the sub-pixels connected with the same data line are the same;
the second end of the first test line is connected with a plurality of adjacent first data lines, and the light emitting colors of the sub-pixels corresponding to different first data lines are different; or
The second end of the first test line is connected with the plurality of adjacent second data lines, and the light emitting colors of the sub-pixels corresponding to the second data lines are different.
4. The display panel according to claim 3, further comprising a plurality of second switch units, wherein the second end of the first test line is connected to the first data line through the second switch units, or the second end of the first test line is connected to the second data line through the second switch units.
5. The display panel according to claim 1, wherein the test circuit further comprises a plurality of third switching units, a fourth switching unit, and a plurality of second test lines;
the control end of the third switching unit is connected with the second control signal end, the first end of the third switching unit is connected with the first display test end, and the second end of the third switching unit is connected with the first end of the first test line;
the control end of the fourth switching unit is connected with the third control signal end, the first end of the fourth switching unit is connected with the second display test end, the second end of the fourth switching unit is connected with the first end of the second test line, and the second end of the second test line is connected with at least one data line;
wherein the data lines to which the first test line and the second test line are connected are different.
6. The display panel according to claim 5, wherein in a testing stage of the fingerprint identification unit, the third control signal terminal controls the fourth switch unit to be turned on, and a test voltage signal output by the second display testing terminal is transmitted to a corresponding data line through the second testing line.
7. The display panel according to claim 5, wherein the first test line is connected to an odd number of data lines, and the second test line is connected to an even number of data lines;
in a display test stage of the sub-pixels connected with the odd data lines, the first display test end outputs a first display test signal, the second control signal end controls the third switch unit to be conducted, and the first display test signal is transmitted to the odd data lines through the first test line;
in a display test stage of the sub-pixels connected with the even data lines, the second display test end outputs a second display test signal, the third control signal end controls the fourth switch unit to be conducted, and the second display test signal is transmitted to the even data lines through the second test line.
8. The display panel according to claim 1, wherein the second end of the first switch unit is connected to the first ends of n first test lines, and n is a positive integer less than or equal to 3.
9. A VT testing method of a display panel, which is suitable for testing the display panel of any one of claims 1 to 8, the VT testing method comprises:
applying an illumination signal to the fingerprint identification unit;
the first control signal end controls the first switch unit to be conducted, and the voltage signal output by the fingerprint identification unit is transmitted to the corresponding data line through the first test line;
and testing the fingerprint identification unit according to the display picture of the display panel.
10. The VT test method of a display panel according to claim 9, wherein the test circuit further comprises a plurality of third switching units, a fourth switching unit, and a plurality of second test lines;
in the testing stage of the fingerprint identification unit, the third control signal end controls the fourth switch unit to be conducted, and a testing voltage signal output by the second display testing end is transmitted to the corresponding data line through the second testing line.
11. The VT test method of a display panel of claim 10, wherein the test voltage signal output by the second display test terminal comprises a voltage signal corresponding to 8-level gray scale.
12. The VT test method of a display panel according to claim 10, wherein the first test line is connected to an odd number of data lines, and the second test line is connected to an even number of data lines;
in a display test stage of the sub-pixels connected with the odd data lines, a first display test end outputs a first display test signal, a second control signal end controls the third switch unit to be conducted, and the first display test signal is transmitted to the odd data lines through the first test line;
in a display test stage of the sub-pixels connected with the even data lines, the second display test end outputs a second display test signal, the third control signal end controls the fourth switch unit to be conducted, and the second display test signal is transmitted to the even data lines through the second test line.
13. A display device comprising the display panel according to any one of claims 1 to 8.
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| KR20190059767A (en) * | 2017-11-23 | 2019-05-31 | 엘지디스플레이 주식회사 | Driving circuit, display panel and display device |
| US20190362667A1 (en) * | 2018-05-23 | 2019-11-28 | Wuhan Tianma Micro-Electronics Co., Ltd. | Display panel, method for driving the same, and display device |
| CN111881847A (en) * | 2020-07-30 | 2020-11-03 | 厦门天马微电子有限公司 | Display panel, detection method thereof and display device |
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