CN108426703B - Lighting test circuit and lighting test method - Google Patents
Lighting test circuit and lighting test method Download PDFInfo
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- CN108426703B CN108426703B CN201810213497.3A CN201810213497A CN108426703B CN 108426703 B CN108426703 B CN 108426703B CN 201810213497 A CN201810213497 A CN 201810213497A CN 108426703 B CN108426703 B CN 108426703B
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- 238000010998 test method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 abstract description 3
- 101710176296 Switch 2 Proteins 0.000 description 17
- 238000001514 detection method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Abstract
The invention provides a lighting test circuit and a lighting test method. The lighting test circuit is applied to a display module, and the display module comprises N public electrode wires; n is an integer greater than 1; the lighting test circuit includes: the public electrode wire on-off unit is respectively connected with an on-off control line and the N public electrode wires and is used for controlling connection or disconnection between every two public electrode wires under the control of an on-off control signal on the on-off control line; and the on-off control unit is connected with the on-off control line and used for providing the on-off control signal for the on-off control line. The invention solves the problems that in the prior art, the difference of the voltages of the common electrodes is eliminated by a method of connecting the first common electrode wire and the second common electrode wire with the same pin of the lighting signal source chip, so that a checkerboard picture cannot be displayed during the lighting test of a box, and poor touch cannot be detected.
Description
Technical Field
The invention relates to the technical field of display, in particular to a lighting test circuit and a lighting test method.
Background
The display module comprises a plurality of rows and columns of mutually independent public electrode blocks which can be multiplexed as touch electrode blocks, and the display module can comprise a first public electrode wire and a second public electrode wire so as to realize checkerboard picture detection of poor touch during box lighting test. When the box is lighted up and tested, if the voltage of the common electrode transmitted to the first common electrode wire is not equal to the voltage of the common electrode transmitted to the second common electrode wire when a gray scale picture is displayed, checkerboard ghost images with different degrees can be caused on the gray scale picture, and therefore poor detection of the gray scale is influenced. In the prior art, the common electrode voltage difference is eliminated by connecting the first common electrode line and the second common electrode line with the same pin of the lighting signal source chip, however, in this way, a checkerboard picture cannot be displayed during the lighting test of the box, and the significance of adopting two common electrode lines to detect poor touch is lost.
Disclosure of Invention
The invention mainly aims to provide a lighting test circuit and a lighting test method, which solve the problems that in the prior art, the difference of common electrode voltage is eliminated by a method of enabling a first common electrode wire and a second common electrode wire which are included in a display module to be connected with the same pin of a lighting signal source chip, so that a checkerboard picture cannot be displayed during lighting test of a box, and poor touch cannot be detected.
In order to achieve the above object, the present invention provides a lighting test circuit, which is applied to a display module, wherein the display module comprises N common electrode lines; n is an integer greater than 1; the lighting test circuit includes:
the public electrode wire on-off unit is respectively connected with an on-off control line and the N public electrode wires and is used for controlling connection or disconnection between every two public electrode wires under the control of an on-off control signal on the on-off control line; and the number of the first and second groups,
and the on-off control unit is connected with the on-off control line and used for providing the on-off control signal for the on-off control line.
In the implementation process, N is equal to 2, and the public electrode line on-off unit comprises at least one on-off transistor;
a control electrode of the on-off transistor is connected with the on-off control line, a first electrode of the on-off transistor is connected with a first common electrode line included in the display module, and a second electrode of the on-off transistor is connected with a second common electrode line included in the display module;
the at least one on-off transistor is an n-type transistor, or the at least one on-off transistor is a p-type transistor.
When the display module is implemented, the display module also comprises mutually independent multi-row and multi-column common electrode blocks;
the lighting test circuit further includes:
the common electrode voltage providing unit is respectively connected with a voltage control line, the multiple rows and columns of common electrode blocks, the first common electrode line and the second common electrode line and is used for controlling the common electrode blocks to be connected with the first common electrode line or the second common electrode line under the control of the voltage control line; and the number of the first and second groups,
and the lighting signal source is respectively connected with the first common electrode wire and the second common electrode wire and used for providing a first common electrode voltage for the first common electrode wire and a second common electrode voltage for the second common electrode wire.
In practice, the common electrode voltage providing unit includes a first voltage providing module and a second voltage providing module, wherein,
the first voltage providing module is respectively connected with the voltage control line, the first common electrode line, the odd-numbered row and odd-numbered column common electrode blocks and the even-numbered row and even-numbered column common electrode blocks, and is used for controlling the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks to be switched on or off under the control of the voltage control line and controlling the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks to be switched on or off under the control of the voltage control line;
the second voltage providing module is respectively connected with the voltage control line, the second common electrode line, the odd-row and even-column common electrode blocks and the even-row and odd-column common electrode blocks, and is used for controlling the connection between the second common electrode line and the odd-row and even-column common electrode blocks to be switched on or off under the control of the voltage control line and controlling the connection between the second common electrode line and the even-row and odd-column common electrode blocks to be switched on or off under the control of the voltage control line.
In practice, the first voltage providing module includes a plurality of first voltage providing transistors and a plurality of second voltage providing transistors;
the first voltage supply transistor corresponds to an odd-numbered row and odd-numbered column common electrode block, and the second voltage supply transistor corresponds to an even-numbered row and even-numbered column common electrode block;
the grid electrode of the first voltage supply transistor is connected with the voltage control line, the first pole of the first voltage supply transistor is connected with the first common electrode line, and the second pole of the first voltage supply transistor is connected with the common electrode block of the odd-numbered row and the odd-numbered column corresponding to the first voltage supply transistor;
the grid electrode of the second voltage supply transistor is connected with the voltage control line, the first pole of the second voltage supply transistor is connected with the first common electrode line, and the second pole of the second voltage supply transistor is connected with the common electrode block of the even rows and the even columns corresponding to the second voltage supply transistor;
the plurality of first voltage supply transistors are all n-type transistors, and the plurality of second voltage supply transistors are all n-type transistors; or, the plurality of first voltage supply transistors are all p-type transistors, and the plurality of second voltage supply transistors are all p-type transistors;
in practice, the second voltage providing module comprises a plurality of third voltage providing transistors and a plurality of fourth voltage providing transistors;
the third voltage supply transistor corresponds to an odd-numbered row and even-numbered column common electrode block, and the fourth voltage supply transistor corresponds to an even-numbered row and odd-numbered column common electrode block;
the grid electrode of the third voltage supply transistor is connected with the voltage control line, the first pole of the third voltage supply transistor is connected with the second common electrode line, and the second pole of the third voltage supply transistor is connected with the common electrode block of the odd-numbered row and even-numbered column corresponding to the third voltage supply transistor;
a gate of the fourth voltage supply transistor is connected to the voltage control line, a first pole of the fourth voltage supply transistor is connected to the second common electrode line, and a second pole of the fourth voltage supply transistor is connected to the common electrode block of the even-numbered row and odd-numbered column corresponding to the fourth voltage supply transistor;
the plurality of third voltage supply transistors are all n-type transistors, and the plurality of fourth voltage supply transistors are all n-type transistors; alternatively, the plurality of third voltage supply transistors are all p-type transistors, and the plurality of fourth voltage supply transistors are all p-type transistors.
The invention also provides a lighting test method, which adopts the lighting test circuit to carry out lighting test on the display module, wherein the display module comprises N public electrode wires; n is an integer greater than 1; the lighting test method comprises the following steps:
in the lighting test stage of the box, when a gray scale picture is displayed, the on-off control unit provides a first on-off control signal for the on-off control line, and the on-off unit of the public electrode lines controls and conducts the connection between every two public electrode lines under the control of the first on-off control signal.
In implementation, N is equal to 2, and the lighting test method further includes:
in the lighting test stage of the paired boxes, when a black and white checkerboard picture is displayed, the on-off control unit provides a second on-off control signal for the on-off control line, and the public electrode line on-off unit controls and disconnects the connection between the first public electrode line included by the display module and the second public electrode line included by the display module under the control of the second on-off control signal.
When the display module is implemented, the display module comprises mutually independent multi-row and multi-column common electrode blocks; the lighting test circuit comprises a common electrode voltage supply unit and a lighting signal source; the common electrode voltage providing unit comprises a first voltage providing module and a second voltage providing module;
the lighting test method further comprises the following steps:
in the lighting test stage of the pair box, a lighting signal source provides a first common electrode voltage for the first common electrode wire, and a lighting signal source provides a second common electrode voltage for the second common electrode wire; under the control of the voltage control line, the first voltage providing module controls and conducts the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls and conducts the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls and conducts the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls and conducts the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks;
in a module lighting test stage, the first voltage providing module controls to disconnect the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls to disconnect the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls to disconnect the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls to disconnect the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks.
During implementation, in the box-to-box lighting test stage, when a gray scale picture is displayed, the voltage of the first common electrode is equal to that of the second common electrode;
in the lighting test stage of the pair box, when a black and white checkerboard picture is displayed, the voltage of the first common electrode is not equal to that of the second common electrode.
Compared with the prior art, the lighting test circuit and the lighting test method can conduct the connection between every two public electrode wires included in the display module under the control of the on-off control signal provided by the on-off control unit through the public electrode wire on-off unit when a gray scale picture is displayed in a CELL ET (on-box lighting) test stage, so that the public electrode voltages on different public electrode wires are equal when the gray scale picture is displayed in the box lighting test stage, the displayed gray scale picture is accurate, the bad detection of the gray scale is not influenced, and a checkerboard picture can be displayed in the box lighting test stage to detect the bad touch phenomenon.
Drawings
Fig. 1 is a structural diagram of a lighting test circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a lighting test circuit according to another embodiment of the present invention;
fig. 3 is a structural diagram of a lighting test circuit according to another embodiment of the invention;
fig. 4 is a structural diagram of a lighting test circuit according to still another embodiment of the present invention;
fig. 5 is a circuit diagram of a lighting test circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The lighting test circuit is applied to a display module, and the display module comprises N public electrode wires; n is an integer greater than 1; as shown in fig. 1, the lighting test circuit includes:
the common electrode line on-off unit 11 is respectively connected to the on-off control line Switch2 and the N common electrode lines (not shown in fig. 1), and is configured to control connection between each two common electrode lines to be switched on or switched off under control of an on-off control signal on the on-off control line Switch 2; and the number of the first and second groups,
and the on-off control unit 12 is connected with the on-off control line Switch2 and is used for providing the on-off control signal for the on-off control line Switch 2.
The lighting test circuit provided by the embodiment of the invention can conduct the connection between every two public electrode wires included in the display module under the control of the on-off control signal provided by the on-off control unit 12 through the public electrode wire on-off unit 11 when displaying the gray scale picture in the CELL ET (opposite box lighting) test stage, so that when displaying the gray scale picture in the opposite box lighting test stage, the public electrode voltages on different public electrode wires are equal, the displayed gray scale picture is accurate, and the bad detection of the gray scale is not influenced. In addition, the lighting test circuit according to the embodiment of the invention can control to disconnect the connection between every two common electrode wires when a checkerboard picture is displayed in the lighting test stage of the box through the common electrode wire on-off unit 11 so as to detect poor touch.
In actual operation, N may be equal to 2, the display module includes a first common electrode line and a second common electrode line, and when performing a lighting test on the box, if the first common electrode line and the second common electrode line are not connected, then since the voltage of the common electrodes output to the first common electrode line and the second common electrode line by the lighting signal source is different, when displaying a gray-scale picture, a gray-scale picture may have checkerboard ghosts of different degrees, thereby affecting the detection of bad gray-scale. In the embodiment of the present invention, N may be not only equal to 2, but also any integer greater than 2. In the following description of the present invention, N is specifically described as 2.
When N is equal to 2, in the lighting test stage of the pairing box, the first common electrode line and the second common electrode line are controlled to be communicated through the common electrode line on-off unit when the gray-scale picture is displayed, and the first common electrode line and the second common electrode line are controlled to be not communicated through the common electrode line on-off unit when the checkerboard picture is displayed, so that poor touch detection can be realized under the checkerboard picture (a plurality of rows and a plurality of columns of common electrode blocks included in the display module are multiplexed into touch electrode blocks), and checkerboard ghost cannot occur during normal lighting (when the gray-scale picture is displayed). In addition, the lighting test circuit according to the embodiment of the invention can control the first common electrode wire and the second common electrode wire not to be communicated when the checkerboard picture is displayed in the lighting test stage of the box through the common electrode wire on-off unit 11, so that poor touch can be detected.
Specifically, N may be equal to 2, and the common electrode line on-off unit includes at least one on-off transistor;
a control electrode of the on-off transistor is connected with the on-off control line, a first electrode of the on-off transistor is connected with the first common electrode line, and a second electrode of the on-off transistor is connected with the second common electrode line;
the at least one on-off transistor is an n-type transistor, or the at least one on-off transistor is a p-type transistor.
According to an embodiment, N may be equal to 2, as shown in fig. 2, the display module includes a first common electrode line Vcom _ E and a second common electrode line Vcom _ O;
the common electrode line on-off unit 11 includes six on-off transistors: a first on-off transistor M11, a second on-off transistor M12, a third on-off transistor M13, a fourth on-off transistor M14, a fifth on-off transistor M15 and a sixth on-off transistor M16;
the gate of M11 is connected to the on-off control line Switch2, the drain of M11 is connected to the first common electrode line Vcom _ E, and the source of M11 is connected to the second common electrode line Vcom _ O;
the gate of M12 is connected to the on-off control line Switch2, the drain of M12 is connected to the first common electrode line Vcom _ E, and the source of M12 is connected to the second common electrode line Vcom _ O;
the gate of M13 is connected to the on-off control line Switch2, the drain of M13 is connected to the first common electrode line Vcom _ E, and the source of M13 is connected to the second common electrode line Vcom _ O;
the gate of M14 is connected to the on-off control line Switch2, the drain of M14 is connected to the first common electrode line Vcom _ E, and the source of M14 is connected to the second common electrode line Vcom _ O;
the gate of M15 is connected to the on-off control line Switch2, the drain of M15 is connected to the first common electrode line Vcom _ E, and the source of M15 is connected to the second common electrode line Vcom _ O;
the gate of M16 is connected to the on-off control line Switch2, the drain of M16 is connected to the first common electrode line Vcom _ E, and the source of M16 is connected to the second common electrode line Vcom _ O;
m11, M12, M13, M14, M15 and M16 are all n-type transistors.
In the embodiment shown in fig. 2, M11, M12, M13, M14, M15 and M16 may all be MOS transistors (metal-oxide-semiconductor field effect transistors), but are not limited thereto.
In actual operation, the common electrode line on-off unit 11 may include only one on-off transistor; preferably, the common electrode line switching unit 11 may include at least two switching transistors to avoid a situation where the communication between Vcom _ E and Vcom _ O cannot be controlled when displaying a gray-scale picture in the pair-box lighting test phase due to the presence of a switching transistor failure. In specific implementation, the number of the on-off transistors used by the common electrode line on-off unit 11 may be selected according to actual situations.
In specific implementation, the display module can further comprise mutually independent multiple rows and multiple columns of common electrode blocks;
on the basis of the embodiment of the lighting test circuit shown in fig. 1, when N is equal to 2, the display module includes a first common electrode line Vcom _ E and a second common electrode line Vcom _ O;
the common electrode line on-off unit 11 is further connected to the first common electrode line Vcom _ E and the second common electrode line Vcom _ O respectively;
as shown in fig. 3, the lighting test circuit further includes:
a common electrode voltage supply unit 13 connected to the voltage control line Switch1, the plurality of rows and columns of common electrode blocks (not shown in fig. 3), the first common electrode line Vcom _ E, and the second common electrode line Vcom _ O, respectively, for controlling the common electrode blocks to be connected to the first common electrode line Vcom _ E or the second common electrode line Vcom _ O under the control of the voltage control line Switch 1; and the number of the first and second groups,
and a lighting signal source 14, respectively connected to the first common electrode line Vcom _ E and the second common electrode line Vcom _ O, and configured to provide a first common electrode voltage for the first common electrode line Vcom _ E and a second common electrode voltage for the second common electrode line Vcom _ O.
In practical operation, the common electrode voltage providing unit 13 is configured to control the odd-numbered row and even-numbered row common electrode blocks to be connected to the first common electrode line Vcom _ E, control the odd-numbered row and even-numbered row common electrode blocks to be connected to the second common electrode line Vcom _ O, and provide corresponding common electrode voltages to the first common electrode line Vcom _ E and the second common electrode line Vcom _ O through the lighting signal source 14, so as to control the display of the checkerboard image on the display panel included in the display module in the checkerboard image display stage, and detect poor touch at the same time, or control the display of the gray-scale image to provide corresponding common electrode voltages to the common electrode blocks in the box-aligning test stage. When the checkerboard picture is displayed in the box-to-box test stage, the common electrode line on-off unit 11 controls to disconnect the connection between Vcom _ E and Vcom _ O.
In actual operation, in the module lighting test stage, the common electrode voltage supply unit 13 controls the odd-numbered row and odd-numbered column common electrode blocks and the even-numbered row and even-numbered column common electrode blocks not to be communicated with the first common electrode line Vcom _ E, and controls the odd-numbered row and even-numbered column common electrode blocks not to be communicated with the second common electrode line Vcom _ O, so that the common electrode voltage is not supplied to each common electrode block by the lighting signal source 14, but is supplied to each common electrode block by the additionally arranged driving circuit chip.
In practical implementation, on the basis of the embodiment of the lighting test circuit shown in fig. 3, as shown in fig. 4, the common electrode voltage providing unit 13 may include a first voltage providing module 131 and a second voltage providing module 132, wherein,
the first voltage providing module 131 is respectively connected to the voltage control line Switch1, the first common electrode line Vcom _ E, an odd-numbered row and odd-numbered column common electrode block (not shown in fig. 4) and an even-numbered row and even-numbered column common electrode block (not shown in fig. 4), and is used for controlling to turn on or off the connection between the first common electrode line Vcom _ E and the odd-numbered row and odd-numbered column common electrode block (not shown in fig. 4) under the control of the voltage control line Switch1, and to turn on or off the connection between the first common electrode line Vcom _ E and the even-numbered row and even-numbered column common electrode block (not shown in fig. 4) under the control of the voltage control line;
the second voltage providing module 132 is respectively connected to the voltage control line Switch1, the second common electrode line Vcom _ O, an odd-numbered row and even-numbered column common electrode block (not shown in fig. 4) and an even-numbered row and odd-numbered column common electrode block (not shown in fig. 4), and is used for controlling to turn on or off the connection between the second common electrode line Vcom _ O and the odd-numbered row and even-numbered column common electrode block (not shown in fig. 4) under the control of the voltage control line Switch1, and controlling to turn on or off the connection between the second common electrode line Vcom _ O and the even-numbered row and odd-numbered column common electrode block (not shown in fig. 4) under the control of the voltage control line.
Specifically, the first voltage supply module may include a plurality of first voltage supply transistors and a plurality of second voltage supply transistors;
the first voltage supply transistor corresponds to an odd-numbered row and odd-numbered column common electrode block, and the second voltage supply transistor corresponds to an even-numbered row and even-numbered column common electrode block;
the grid electrode of the first voltage supply transistor is connected with the voltage control line, the first pole of the first voltage supply transistor is connected with the first common electrode line, and the second pole of the first voltage supply transistor is connected with the common electrode block of the odd-numbered row and the odd-numbered column corresponding to the first voltage supply transistor;
the grid electrode of the second voltage supply transistor is connected with the voltage control line, the first pole of the second voltage supply transistor is connected with the first common electrode line, and the second pole of the second voltage supply transistor is connected with the common electrode block of the even rows and the even columns corresponding to the second voltage supply transistor;
the plurality of first voltage supply transistors are all n-type transistors, and the plurality of second voltage supply transistors are all n-type transistors; or, the plurality of first voltage supply transistors are all p-type transistors, and the plurality of second voltage supply transistors are all p-type transistors;
specifically, the second voltage supply module may include a plurality of third voltage supply transistors and a plurality of fourth voltage supply transistors;
the third voltage supply transistor corresponds to an odd-numbered row and even-numbered column common electrode block, and the fourth voltage supply transistor corresponds to an even-numbered row and odd-numbered column common electrode block;
the grid electrode of the third voltage supply transistor is connected with the voltage control line, the first pole of the third voltage supply transistor is connected with the second common electrode line, and the second pole of the third voltage supply transistor is connected with the common electrode block of the odd-numbered row and even-numbered column corresponding to the third voltage supply transistor;
a gate of the fourth voltage supply transistor is connected to the voltage control line, a first pole of the fourth voltage supply transistor is connected to the second common electrode line, and a second pole of the fourth voltage supply transistor is connected to the common electrode block of the even-numbered row and odd-numbered column corresponding to the fourth voltage supply transistor;
the plurality of third voltage supply transistors are all n-type transistors, and the plurality of fourth voltage supply transistors are all n-type transistors; alternatively, the plurality of third voltage supply transistors are all p-type transistors, and the plurality of fourth voltage supply transistors are all p-type transistors.
The lighting test circuit according to the present invention is described below with reference to an embodiment.
A specific embodiment of the lighting test circuit of the present invention includes a display module, as shown in fig. 5, where the display module includes a first common electrode line Vcom _ E and a second common electrode line Vcom _ O; as shown in fig. 5, the lighting test circuit includes a common electrode line on-off unit 11, an on-off control unit 12, a common electrode voltage supply unit 13, and a lighting signal source 14;
the on-off control unit 12 is connected to the on-off control line Switch2 and is configured to provide an on-off control signal for the on-off control line Switch 2;
the lighting signal source 14 is respectively connected to the first common electrode line Vcom _ E and the second common electrode line Vcom _ O, and is configured to provide a first common electrode voltage for the first common electrode line Vcom _ E and a second common electrode voltage for the second common electrode line Vcom _ O;
the common electrode line on-off unit 11 includes six on-off transistors: a first on-off transistor M11, a second on-off transistor M12, a third on-off transistor M13, a fourth on-off transistor M14, a fifth on-off transistor M15 and a sixth on-off transistor M16;
the gate of M11 is connected to the on-off control line Switch2, the drain of M11 is connected to the first common electrode line Vcom _ E, and the source of M11 is connected to the second common electrode line Vcom _ O;
the gate of M12 is connected to the on-off control line Switch2, the drain of M12 is connected to the first common electrode line Vcom _ E, and the source of M12 is connected to the second common electrode line Vcom _ O;
the gate of M13 is connected to the on-off control line Switch2, the drain of M13 is connected to the first common electrode line Vcom _ E, and the source of M13 is connected to the second common electrode line Vcom _ O;
the gate of M14 is connected to the on-off control line Switch2, the drain of M14 is connected to the first common electrode line Vcom _ E, and the source of M14 is connected to the second common electrode line Vcom _ O;
the gate of M15 is connected to the on-off control line Switch2, the drain of M15 is connected to the first common electrode line Vcom _ E, and the source of M15 is connected to the second common electrode line Vcom _ O;
the gate of M16 is connected to the on-off control line Switch2, the drain of M16 is connected to the first common electrode line Vcom _ E, and the source of M16 is connected to the second common electrode line Vcom _ O;
the common electrode voltage supply unit 13 includes a plurality of first voltage supply transistors, a plurality of second voltage supply transistors, a plurality of third voltage supply transistors, and a plurality of fourth voltage supply transistors;
in fig. 5, only one first voltage supply transistor M21, one second voltage supply transistor M22, one third voltage supply transistor M23, one fourth voltage supply transistor M24 are exemplarily shown;
the first voltage supply transistor M21 corresponds to an odd-numbered row and odd-numbered column common electrode block Vcoo, and the second voltage supply transistor M22 corresponds to an even-numbered row and even-numbered column common electrode block Vcee;
a gate of the first voltage supply transistor M21 is connected to the voltage control line Switch1, a drain of the first voltage supply transistor M21 is connected to the first common electrode line Vcom _ E, a source of the first voltage supply transistor M21 is connected to the odd-numbered column and odd-numbered row common electrode block Vcoo corresponding to the first voltage supply transistor M21;
a gate of the second voltage supplying transistor M22 is connected to the voltage control line Switch1, a drain of the second voltage supplying transistor M22 is connected to the first common electrode line Vcom _ E, a source of the second voltage supplying transistor M22 is connected to the even row and even column common electrode block Vcee corresponding to the second voltage supplying transistor M22;
the third voltage supply transistor M23 corresponds to an odd-numbered row and even-numbered column common electrode block Vcoe, and the fourth voltage supply transistor M24 corresponds to an even-numbered row and odd-numbered column common electrode block vcoo;
the gate of the third voltage supplying transistor M23 is connected to the voltage control line Switch1, the drain of the third voltage supplying transistor M23 is connected to the second common electrode line Vcom _ O, the source of the third voltage supplying transistor M23 is connected to the odd row and even column common electrode block Vcoe corresponding to the third voltage supplying transistor M23;
the gate of the fourth voltage supplying transistor M24 is connected to the voltage control line Switch1, the drain of the fourth voltage supplying transistor M24 is connected to the second common electrode line Vcom _ O, and the source of the fourth voltage supplying transistor M24 is connected to the even row and odd column common electrode block Vceo corresponding to the fourth voltage supplying transistor M24.
In the embodiment shown in fig. 5, all the transistors are n-type transistors, but not limited thereto.
When the lighting test circuit shown in fig. 5 works, in the lighting test stage of the pair-box, M21, M22, M23 and M24 are normally open; in the phase of the lighting test of the pair of boxes,
when a gray-scale picture is displayed, the Switch2 outputs a high level, M11, M12, M13, M14, M15 and M16 are all opened, and Vcom _ E and Vcom _ O are in short circuit, so that the common electrode voltages input to different common electrode blocks are the same, and checkerboard ghost cannot occur at the moment;
when a checkerboard picture is displayed, the Switch2 outputs a low level, M11, M12, M13, M14, M15 and M16 are all turned off, Vcom _ E and Vcom _ O are not communicated, different common electrode voltages are supplied to VCOM _ E, VCOM _ O by the lighting signal source 14, the checkerboard picture can be displayed, and poor touch control can be detected.
When the embodiment of the lighting test circuit shown in fig. 5 works, in the module lighting test stage, M21, M22, M23 and M24 are normally closed, and the lighting signal source 14 does not provide the common electrode voltage for each common electrode block, but the additional driving circuit chip provides the common electrode voltage for each common electrode block.
The lighting test method of the embodiment of the invention adopts the lighting test circuit to carry out lighting test on the display module, and the display module comprises a first public electrode wire and a second public electrode wire; the lighting test method comprises the following steps:
in the lighting test stage of the box, when a gray scale picture is displayed, the on-off control unit provides a first on-off control signal for the on-off control line, and the public electrode line on-off unit controls and conducts connection between the first public electrode line and the second public electrode line under the control of the first on-off control signal.
The lighting test method provided by the embodiment of the invention can conduct the connection between every two public electrode wires included in the display module under the control of the on-off control signal provided by the on-off control unit through the public electrode wire on-off unit when the gray scale picture is displayed in the CELL ET (on-CELL lighting) test stage, so that the condition that the displayed gray scale picture is inaccurate and the bad detection of the gray scale is influenced because the voltages of the public electrodes on different public electrode wires are different when the gray scale picture is displayed in the on-CELL lighting test stage is improved.
In actual operation, N may be equal to 2, the display module includes a first common electrode line and a second common electrode line, and when performing a lighting test on the box, if the first common electrode line and the second common electrode line are not connected, then since the voltage of the common electrodes output to the first common electrode line and the second common electrode line by the lighting signal source is different, when displaying a gray-scale picture, a gray-scale picture may have checkerboard ghosts of different degrees, thereby affecting the detection of bad gray-scale. In the embodiment of the present invention, N may be not only equal to 2, but also any integer greater than 2. In the following description of the present invention, N is specifically described as 2.
When N is equal to 2, in the lighting test stage of the pairing box, the first common electrode line and the second common electrode line are controlled to be communicated through the common electrode line on-off unit when the gray-scale picture is displayed, and the first common electrode line and the second common electrode line are controlled to be not communicated through the common electrode line on-off unit when the checkerboard picture is displayed, so that poor touch detection can be realized under the checkerboard picture (a plurality of rows and a plurality of columns of common electrode blocks included in the display module are multiplexed into touch electrode blocks), and checkerboard ghost cannot occur during normal lighting (when the gray-scale picture is displayed).
Specifically, the lighting test method may further include:
in the lighting test stage of the paired boxes, when a black and white checkerboard picture is displayed, the on-off control unit provides a second on-off control signal for the on-off control line, and the public electrode line on-off unit controls to disconnect the connection between the first public electrode line and the second public electrode line under the control of the second on-off control signal.
In actual operation, the display module comprises mutually independent multiple rows and multiple columns of common electrode blocks; the lighting test circuit comprises a common electrode voltage supply unit and a lighting signal source; the common electrode voltage providing unit comprises a first voltage providing module and a second voltage providing module;
the lighting test method further comprises the following steps:
in the lighting test stage of the pair box, a lighting signal source provides a first common electrode voltage for the first common electrode wire, and a lighting signal source provides a second common electrode voltage for the second common electrode wire; under the control of the voltage control line, the first voltage providing module controls and conducts the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls and conducts the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls and conducts the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls and conducts the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks;
in a module lighting test stage, the first voltage providing module controls to disconnect the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls to disconnect the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls to disconnect the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls to disconnect the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks.
In actual operation, the common electrode voltage providing unit controls odd-numbered row and even-numbered row common electrode blocks to be respectively connected with the first common electrode line, controls odd-numbered row and even-numbered row common electrode blocks to be respectively connected with the second common electrode line, and provides corresponding common electrode voltages to the first common electrode line and the second common electrode line through the lighting signal source, so that the checkerboard pictures are controlled to be displayed on the display panel included in the display module in the checkerboard picture display stage, poor touch can be detected at the same time, and the corresponding common electrode voltages can be provided for the common electrode blocks in the box aligning test stage when the gray-scale pictures are displayed. When the checkerboard picture is displayed in the box-aligning test stage, the public electrode wire on-off unit controls to disconnect the first public electrode wire and the second public electrode wire so as to display the checkerboard picture.
In practical operation, in a module lighting test stage, the common electrode voltage supply unit controls the odd-numbered row and odd-numbered column common electrode blocks and the even-numbered row and even-numbered column common electrode blocks not to be communicated with the first common electrode line, controls the odd-numbered row and even-numbered column common electrode blocks not to be communicated with the second common electrode line, does not supply common electrode voltage to each common electrode block by the lighting signal source, and supplies the common electrode voltage to each common electrode block by the additionally arranged driving circuit chip.
In actual operation, in the box-to-box lighting test stage, when a gray scale picture is displayed, the voltage of the first common electrode is equal to that of the second common electrode, so that all the common electrode blocks are connected to the same common electrode voltage;
in the lighting test stage of the pair box, when a black and white checkerboard picture is displayed, the voltage of the first common electrode is not equal to the voltage of the second common electrode, so that the checkerboard picture can be displayed.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A lighting test circuit is applied to a display module, and the display module comprises N public electrode wires; n is an integer greater than 1; characterized in that, the test circuit of lighting up includes:
the public electrode wire on-off unit is respectively connected with an on-off control line and the N public electrode wires and is used for controlling connection or disconnection between every two public electrode wires under the control of an on-off control signal on the on-off control line; and the number of the first and second groups,
the on-off control unit is connected with the on-off control line and used for providing the on-off control signal for the on-off control line;
the on-off control unit is used for providing a first on-off control signal for the on-off control line when a gray scale picture is displayed in a box lighting test stage;
and the public electrode wire on-off unit is used for controlling and conducting the connection between every two public electrode wires under the control of the first on-off control signal in the box lighting test stage.
2. The lighting test circuit of claim 1 wherein N is equal to 2, the common electrode line switching unit includes at least one switching transistor;
a control electrode of the on-off transistor is connected with the on-off control line, a first electrode of the on-off transistor is connected with a first common electrode line included in the display module, and a second electrode of the on-off transistor is connected with a second common electrode line included in the display module;
the at least one on-off transistor is an n-type transistor, or the at least one on-off transistor is a p-type transistor.
3. The lighting test circuit of claim 2 wherein the display module further comprises mutually independent rows and columns of common electrode blocks;
the lighting test circuit further includes:
the common electrode voltage providing unit is respectively connected with a voltage control line, the multiple rows and columns of common electrode blocks, the first common electrode line and the second common electrode line and is used for controlling the common electrode blocks to be connected with the first common electrode line or the second common electrode line under the control of the voltage control line; and the number of the first and second groups,
and the lighting signal source is respectively connected with the first common electrode wire and the second common electrode wire and used for providing a first common electrode voltage for the first common electrode wire and a second common electrode voltage for the second common electrode wire.
4. The lighting test circuit of claim 3 wherein the common electrode voltage supply unit includes a first voltage supply module and a second voltage supply module, wherein,
the first voltage providing module is respectively connected with the voltage control line, the first common electrode line, the odd-numbered row and odd-numbered column common electrode blocks and the even-numbered row and even-numbered column common electrode blocks, and is used for controlling the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks to be switched on or off under the control of the voltage control line and controlling the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks to be switched on or off under the control of the voltage control line;
the second voltage providing module is respectively connected with the voltage control line, the second common electrode line, the odd-row and even-column common electrode blocks and the even-row and odd-column common electrode blocks, and is used for controlling the connection between the second common electrode line and the odd-row and even-column common electrode blocks to be switched on or off under the control of the voltage control line and controlling the connection between the second common electrode line and the even-row and odd-column common electrode blocks to be switched on or off under the control of the voltage control line.
5. The lighting test circuit of claim 4, wherein the first voltage supply module includes a plurality of first voltage supply transistors and a plurality of second voltage supply transistors;
the first voltage supply transistor corresponds to an odd-numbered row and odd-numbered column common electrode block, and the second voltage supply transistor corresponds to an even-numbered row and even-numbered column common electrode block;
the grid electrode of the first voltage supply transistor is connected with the voltage control line, the first pole of the first voltage supply transistor is connected with the first common electrode line, and the second pole of the first voltage supply transistor is connected with the common electrode block of the odd-numbered row and the odd-numbered column corresponding to the first voltage supply transistor;
the grid electrode of the second voltage supply transistor is connected with the voltage control line, the first pole of the second voltage supply transistor is connected with the first common electrode line, and the second pole of the second voltage supply transistor is connected with the common electrode block of the even rows and the even columns corresponding to the second voltage supply transistor;
the plurality of first voltage supply transistors are all n-type transistors, and the plurality of second voltage supply transistors are all n-type transistors; alternatively, the plurality of first voltage supply transistors are all p-type transistors, and the plurality of second voltage supply transistors are all p-type transistors.
6. The lighting test circuit of claim 4, wherein the second voltage supply module includes a plurality of third voltage supply transistors and a plurality of fourth voltage supply transistors;
the third voltage supply transistor corresponds to an odd-numbered row and even-numbered column common electrode block, and the fourth voltage supply transistor corresponds to an even-numbered row and odd-numbered column common electrode block;
the grid electrode of the third voltage supply transistor is connected with the voltage control line, the first pole of the third voltage supply transistor is connected with the second common electrode line, and the second pole of the third voltage supply transistor is connected with the common electrode block of the odd-numbered row and even-numbered column corresponding to the third voltage supply transistor;
a gate of the fourth voltage supply transistor is connected to the voltage control line, a first pole of the fourth voltage supply transistor is connected to the second common electrode line, and a second pole of the fourth voltage supply transistor is connected to the common electrode block of the even-numbered row and odd-numbered column corresponding to the fourth voltage supply transistor;
the plurality of third voltage supply transistors are all n-type transistors, and the plurality of fourth voltage supply transistors are all n-type transistors; alternatively, the plurality of third voltage supply transistors are all p-type transistors, and the plurality of fourth voltage supply transistors are all p-type transistors.
7. A lighting test method, which adopts the lighting test circuit as claimed in any one of claims 1 to 6 to perform lighting test on a display module, wherein the display module comprises N public electrode wires; n is an integer greater than 1; the lighting test method is characterized by comprising the following steps:
in the lighting test stage of the box, when a gray scale picture is displayed, the on-off control unit provides a first on-off control signal for the on-off control line, and the on-off unit of the public electrode lines controls and conducts the connection between every two public electrode lines under the control of the first on-off control signal.
8. The lighting test method of claim 7 wherein N is equal to 2, the lighting test method further comprising:
in the lighting test stage of the paired boxes, when a black and white checkerboard picture is displayed, the on-off control unit provides a second on-off control signal for the on-off control line, and the public electrode line on-off unit controls and disconnects the connection between the first public electrode line included by the display module and the second public electrode line included by the display module under the control of the second on-off control signal.
9. The lighting test method according to claim 8, wherein the display module includes mutually independent common electrode blocks in a plurality of rows and a plurality of columns; the lighting test circuit comprises a common electrode voltage supply unit and a lighting signal source; the common electrode voltage providing unit comprises a first voltage providing module and a second voltage providing module;
the lighting test method further comprises the following steps:
in the lighting test stage of the pair box, a lighting signal source provides a first common electrode voltage for the first common electrode wire, and a lighting signal source provides a second common electrode voltage for the second common electrode wire; under the control of the voltage control line, the first voltage providing module controls and conducts the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls and conducts the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls and conducts the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls and conducts the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks;
in a module lighting test stage, the first voltage providing module controls to disconnect the connection between the first common electrode line and the odd-numbered row and odd-numbered column common electrode blocks, the first voltage providing module controls to disconnect the connection between the first common electrode line and the even-numbered row and even-numbered column common electrode blocks, the second voltage providing module controls to disconnect the connection between the second common electrode line and the odd-numbered row and even-numbered column common electrode blocks, and the second voltage providing module controls to disconnect the connection between the second common electrode line and the even-numbered row and odd-numbered column common electrode blocks.
10. The lighting test method according to claim 9, wherein in the pair-box lighting test phase, when a gray-scale picture is displayed, the first common electrode voltage is equal to the second common electrode voltage;
in the lighting test stage of the pair box, when a black and white checkerboard picture is displayed, the voltage of the first common electrode is not equal to that of the second common electrode.
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| JP5893582B2 (en) * | 2013-03-27 | 2016-03-23 | 株式会社ジャパンディスプレイ | Display device with touch detection function and electronic device |
| CN103278948B (en) * | 2013-05-30 | 2015-10-21 | 合肥京东方光电科技有限公司 | The method detected for the line badness of display panel and pick-up unit |
| CN103995407B (en) * | 2014-05-08 | 2016-08-24 | 京东方科技集团股份有限公司 | Array base palte and display floater |
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