CN108491116B - Touch unit detection method and system of embedded touch display panel - Google Patents
Touch unit detection method and system of embedded touch display panel Download PDFInfo
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- CN108491116B CN108491116B CN201810241528.6A CN201810241528A CN108491116B CN 108491116 B CN108491116 B CN 108491116B CN 201810241528 A CN201810241528 A CN 201810241528A CN 108491116 B CN108491116 B CN 108491116B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
The invention provides a touch unit detection method and a touch unit detection system of an embedded touch display panel. The method for detecting the touch units of the embedded touch display panel can detect short circuits and open circuits of a plurality of touch units inside the embedded touch display panel by connecting a detection device outside the embedded touch display panel at the Cell process stage of the embedded touch display panel, and does not need to detect the touch units after the IC and the FPC are bonded on the display panel at the module process stage of the embedded touch display panel as in the prior art, so that the embedded touch display panel with poor touch effect at the Cell process stage can be prevented from flowing into the next process, the production efficiency is improved, the waste of materials such as the IC and the FPC can be reduced, and the method is favorable for directly delivering goods in the manner of the embedded touch display panel at the Cell process stage.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch unit detection method and a touch unit detection system of an embedded touch display panel.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages such as high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel operates on the principle that liquid crystal molecules are filled between a Thin Film Transistor Array (TFT Array Substrate) and a Color Filter (CF) Substrate, and driving voltages are applied to the two substrates to control the rotation direction of the liquid crystal molecules, so that light of the backlight module is refracted out to generate a picture.
The touch liquid crystal display panel can be divided into a resistive type, a capacitive type, an optical type and a sound wave type according to different sensing technologies, the current mainstream touch technology is the capacitive type, wherein the capacitive type is also divided into a self-capacitive type and a mutual capacitive type, the capacitive type touch display panel on the market is mainly the mutual capacitive type, and the mutual capacitance has the advantage of realizing multi-point touch. Touch display panels can be divided into an external (on-cell) type and an embedded (in-cell) type according to different structures: the outer hanging type is that the touch sensor is manufactured on the surface of the color filter, the touch sensor and glass are manufactured into a touch panel module, and then the touch panel module is attached to the liquid crystal panel module. The embedded touch sensor is manufactured in a panel structure, the touch sensor is directly arranged in a thin film transistor liquid crystal display panel module, the touch function is integrated in a display, and a touch panel does not need to be externally hung, so the thickness of the embedded touch sensor is lighter and thinner than that of an externally hung touch panel.
The existing embedded touch display panel can only test the display effect in the process stage of forming a box (Cell) by a TFT substrate and a CF substrate, and the touch effect cannot be tested due to the fact that an Integrated Circuit (IC) and a Flexible Printed Circuit (FPC) are not bonded, so that the touch effect test needs to be carried out after the IC, the FPC and the display panel are bonded in the process stage of a module, although the embedded touch display panel with poor touch can be tested in the process stage of the module, materials of the IC and the FPC are wasted due to the fact that the IC and the FPC are bonded, and the touch effect cannot be tested in the process stage of the Cell, the display panel with poor touch flows into the next process, and the production efficiency is reduced.
Disclosure of Invention
The invention aims to provide a method for detecting a touch unit of an embedded touch display panel, which can prevent the embedded touch display panel with poor touch effect from flowing into the next process in the Cell process stage, improve the production efficiency and reduce the waste of materials such as IC (integrated circuit), FPC (flexible printed circuit) and the like.
The present invention is also directed to a system for detecting a touch unit of an embedded touch display panel, which can prevent the embedded touch display panel with poor touch effect from flowing into the next process during the Cell process, thereby improving the production efficiency and reducing the waste of IC and FPC materials.
To achieve the above object, the present invention provides a method for detecting a touch unit of an in-cell touch display panel, comprising the steps of:
step S1, providing an in-cell touch display panel and a detection device connected to the in-cell touch display panel, the in-cell touch display panel including: a plurality of touch units arranged in an array;
step S2, performing short circuit detection of the touch unit:
selecting one of the touch units as a touch unit to be detected, wherein the detection device provides a direct current voltage for the touch unit to be detected and provides a low potential for the rest of the touch units; the detection device starts to detect the current values of all the touch units; when the detection device can detect that the current value of one or more of the touch unit to be detected and the rest touch units is not 0, judging that a short circuit occurs between the touch unit to be detected and the touch unit with the current value or values not 0; when the detection device detects that the current values of all the touch units are 0, it is determined that no short circuit occurs between the touch unit to be detected and the rest of the touch units.
The method for detecting the touch units of the in-cell touch display panel further includes step S3, and step S2 is repeated until the touch units complete short circuit detection.
The method for detecting the touch units of the in-cell touch display panel further includes step S4 of performing open circuit detection of the touch units: selecting one of the touch units as a touch unit to be detected, wherein the detection device stops providing direct-current voltage for the touch unit to be detected and provides a low potential for the rest of the touch units; the detection device starts to detect the capacitance value of the touch unit to be detected; when the detection device detects that the capacitance value of the touch unit to be detected is smaller than a preset threshold value, judging that the touch unit to be detected is open-circuited; and when the detection device detects that the capacitance value of the touch unit to be detected is within the preset range, judging that the touch unit to be detected is not opened.
The method for detecting the touch units of the in-cell touch display panel further includes step S5, and step S4 is repeated until the open circuit detection is completed for each of the touch units.
The detection device comprises a plurality of power supply devices, a plurality of current detection devices and a plurality of capacitance detection devices, wherein the power supply devices, the current detection devices and the capacitance detection devices are connected with the touch units in a one-to-one correspondence mode, the power supply devices are used for supplying voltage to the touch units, the current detection devices are used for detecting current values of the touch units, and the capacitance detection devices are used for detecting capacitance values of the touch units.
The detection device obtains the short-circuit resistance value through the voltage difference between the touch unit to be detected and the touch unit short-circuited with the touch unit to be detected and the current value of the touch unit to be detected.
The direct current voltage is 4-6V.
The low potential is 0-1V.
The preset range of the capacitance value is 80-120 PF.
The preset threshold value is 80 PF.
The invention also provides a touch unit detection system of the embedded touch display panel, which comprises the embedded touch display panel and a detection device connected with the embedded touch display panel, wherein the embedded touch display panel comprises: a plurality of touch units arranged in an array;
the detection device is used for short circuit detection of the touch unit: selecting one of the touch units as a touch unit to be detected, wherein the detection device provides a direct current voltage for the touch unit to be detected and provides a low potential for the rest of the touch units; the detection device starts to detect the current values of all the touch units; when the detection device detects that the current value of one or more of the touch unit to be detected and the rest of the touch units is not 0, the detection device judges that a short circuit occurs between the touch unit to be detected and the touch unit with the current value or values not 0; when the detection device detects that the current values of all the touch units are 0, it is determined that no short circuit occurs between the touch unit to be detected and the rest of the touch units.
The detection device is also used for carrying out open circuit detection of the touch unit: selecting one of the touch units as a touch unit to be detected, wherein the detection device stops providing direct-current voltage for the touch unit to be detected and provides a low potential for the rest of the touch units; the detection device starts to detect the capacitance value of the touch unit to be detected; when the detection device detects that the capacitance value of the touch unit to be detected is smaller than a preset threshold value, judging that the touch unit to be detected is open-circuited; and when the detection device detects that the capacitance value of the touch unit to be detected is within the preset range, judging that the touch unit to be detected is not open.
The detection device comprises a plurality of power supply devices, a plurality of current detection devices and a plurality of capacitance detection devices, wherein the power supply devices, the current detection devices and the capacitance detection devices are connected with the touch units in a one-to-one correspondence mode, the power supply devices are used for supplying voltage to the touch units, the current detection devices are used for detecting current values of the touch units, and the capacitance detection devices are used for detecting capacitance values of the touch units.
The invention has the beneficial effects that: according to the method and the system for detecting the touch units of the embedded touch display panel, the detection device is connected to the outside of the embedded touch display panel, short circuit and open circuit detection can be performed on a plurality of touch units inside the embedded touch display panel at the Cell process stage of the embedded touch display panel, and the touch units are detected without bonding the IC and the FPC to the display panel at the module process stage of the embedded touch display panel in the prior art, so that the embedded touch display panel with poor touch effect at the Cell process stage can be prevented from flowing into the next process, the production efficiency is improved, waste of materials such as the IC and the FPC can be reduced, and the embedded touch display panel can be directly delivered in the Cell process stage.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a flowchart illustrating a method for detecting a touch unit of an in-cell touch display panel according to the present invention;
FIG. 2 is a diagram of the step S1 of the method for detecting touch cells of an in-cell touch display panel according to the present invention and a diagram of a system for detecting touch cells of an in-cell touch display panel according to the present invention;
FIG. 3 is an enlarged schematic view at X of FIG. 2;
fig. 4 is an enlarged view of Y of fig. 2.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, the present invention provides a method for detecting a touch unit of an in-cell touch display panel, comprising the following steps:
step S1, please refer to fig. 2, providing an in-cell touch display panel 1 and a detection apparatus 2 connected to the in-cell touch display panel 1, wherein the in-cell touch display panel 1 includes: a plurality of touch units 10 arranged in an array;
step S2, short circuit detection of the touch unit 10:
selecting one of the touch units 10 as a touch unit 11 to be detected, wherein the detection device 2 provides a direct current voltage to the touch unit 11 to be detected and provides a low potential to the rest of the touch units 10; the detection device 2 starts to detect the current values of all the touch units 10; when the detection device 2 detects that the current value of one or more of the touch unit 11 to be detected and the rest of the touch units 11 is not 0, it is determined that a short circuit occurs between the touch unit 11 to be detected and the touch unit 10 with the current value(s) not 0; when the detection device 2 detects that the current values of all the touch units 10 are 0, it is determined that no short circuit occurs between the touch unit 11 to be detected and the rest of the touch units 10;
step S3, repeating step S2 until the plurality of touch units 10 complete short circuit detection;
step S4, performing open circuit detection of the touch unit 10:
selecting one of the touch units 10 as a touch unit 11 to be detected, wherein the detection device 2 stops providing the direct-current voltage to the touch unit 11 to be detected and provides a low potential to the rest of the touch units 10; the detection device 2 starts to detect the capacitance value of the touch unit 11 to be detected; when the detection device 2 detects that the capacitance value of the touch unit 11 to be detected is smaller than a preset threshold value, it is determined that an open circuit occurs in the touch unit 11 to be detected; when the detection device 2 detects that the capacitance value of the touch unit 11 to be detected is within the preset range, it is determined that the touch unit 11 to be detected is not open;
step S5, repeat step S4 until all the touch units 10 complete the open circuit detection.
Specifically, the detecting device 2 includes a plurality of power supply devices 20 connected to the plurality of touch units 10 in a one-to-one correspondence manner, a plurality of current detecting devices 30, and a plurality of capacitance detecting devices 40, where the power supply devices 20 are configured to provide voltages to the touch units 10, the current detecting devices 30 are configured to detect current values of the touch units 10, and the capacitance detecting devices 40 are configured to detect capacitance values of the touch units 10.
Further, the detection device 2 can also obtain the short-circuit resistance value through the voltage difference between the touch unit 11 to be detected and the touch unit 10 short-circuited therewith, and the current value of the touch unit 11 to be detected.
Specifically, the direct current voltage is 4-6V, and the low potential is 0-1V.
Specifically, the capacitance value normally ranges from 80 to 120 PF.
Specifically, the preset threshold is 80 PF.
It should be noted that, the invention can detect the plurality of touch units 10 inside the embedded touch display panel 1 at the Cell process stage of the embedded touch display panel 1 by connecting the detection device 2 to the outside of the embedded touch display panel 1, and does not need to detect the touch units 10 after the IC and the FPC are bonded to the display panel at the module process stage of the embedded touch display panel 1 as in the prior art, so that the embedded touch display panel 1 with poor touch effect at the Cell process stage can be prevented from flowing into the next process, the production efficiency is improved, the waste of materials such as the IC and the FPC can be reduced, and the invention is favorable for directly delivering goods in the manner of the embedded touch display panel 1 at the Cell process stage.
Specifically, referring to fig. 2 and fig. 3, a preferred embodiment of the present invention is described, in which a plurality of touch units 10 arranged in an array are simplified into a4 × 4 array, and a total of 16 touch units 10 are sequentially labeled as a1-a16, power devices 20 corresponding to the touch units 10 a1-a16 are sequentially labeled as B1-B16, current detection devices 30 corresponding to the touch units 10 a1-a16 are sequentially labeled as C1-C16, and capacitance detection devices 40 corresponding to the touch units 10 a1-a16 are sequentially labeled as D1-D16.
When short-circuit detection is performed on the touch unit 10 a1-a16, firstly, the power supply device 20B 1 supplies a dc voltage to the touch unit 10 a1, the power supply device 20B 2-B16 supplies a low voltage to the touch unit 10 a2-a16, and the current detection device 30C 1-C16 starts to detect the current value of the touch unit 10 a1-a16 (since there is a voltage difference between the touch units 10 that are short-circuited with each other, a current flows, that is, the current value is not 0, and if no short-circuit occurs, no current flows, that is, the current value is 0). When the touch unit 10 a1 and one or more of the remaining touch units 10 are shorted, for example, when the touch unit 10 a1 is shorted with the touch unit a2 A3, the current detection devices 30C 1-C3 respectively detect that the current value of the touch unit 10 a1-A3 is not 0, and when the touch unit 10 a1 is not shorted with the touch unit 10 a2-a16, the current detection devices 30C 1-C16 respectively detect that the current value of the touch unit 10 a1-a16 is 0, and at this time, the short circuit detection of the touch unit 10 a1 is completed.
Then, the power device 20B 2 provides a dc voltage to the touch cell 10 a2, the power devices 20B 1 and B3-B16 provide a low voltage to the touch cells 10 a1 and A3-a16, and the current detecting device 30B 1-B16 starts detecting the current of the touch cells 10 a1-a16, thereby completing the short circuit detection of the touch cell 10 a 2. And so on until the short circuit detection of all the touch units 10 is completed.
Referring to fig. 4, because the touch units 10 are located close to each other, a lateral capacitor Cb is formed between two adjacent touch units 10, for example, the lateral capacitor Cb is formed between the touch unit 10 No. A8 and the touch unit 10 No. a4, the touch unit No. a7, and the touch unit No. a12, and the lateral capacitor Cb can be detected by the capacitor detecting device 40, if the touch unit 10 No. A8 is not open, the capacitance of the touch unit 10 No. A8 is within a predetermined range, and if the touch unit 10 No. A8 is open, the lateral capacitor Cb cannot be detected, the capacitance of the touch unit 10 No. A8 is smaller than a predetermined threshold. When the touch unit 10 a1-a16 is open-circuited, the power device 20B 1 stops supplying the dc voltage to the touch unit 10 a1 (which is equivalent to the power device 20B 1 is not present), the power device 20B 2-B16 supplies a low voltage to the touch unit 10 a2-a16, and the capacitance detecting device 40D 1 starts detecting the capacitance of the touch unit 10 a 1. When the capacitance of the touch unit 10 No. a1 is within the preset range, the touch unit 10 No. a1 is not open, and when the capacitance of the touch unit 10 No. a1 is smaller than a preset threshold, the touch unit 10 No. a1 is open, and at this time, the open detection of the touch unit 10 No. a1 is completed.
Then, the power device 20B 2 stops providing the dc voltage to the touch unit 10 a2, the power devices 20B 1 and B3-B16 both provide a low voltage to the touch units 10 a1 and A3-a16, and the capacitance detecting device 40D 2 starts detecting the capacitance of the touch unit 10 a2, thereby completing the open circuit detection of the touch unit 10 a 2. And so on until the open circuit detection of all the touch units 10 is completed.
Referring to fig. 2, based on the method for detecting a touch unit of an in-cell touch display panel, the present invention further provides a system for detecting a touch unit of an in-cell touch display panel, including an in-cell touch display panel 1 and a detection device 2 connected to the in-cell touch display panel 1, where the in-cell touch display panel 1 includes: a plurality of touch units 10 arranged in an array;
the detection device 2 is used for detecting the short circuit of the touch unit 10: selecting one of the touch units 10 as a touch unit 11 to be detected, wherein the detection device 2 provides a direct current voltage to the touch unit 11 to be detected and provides a low potential to the rest of the touch units 10; the detection device 2 starts to detect the current values of all the touch units 10; when the detection device 2 detects that the current value of one or more of the touch unit 11 to be detected and the rest of the touch units 11 is not 0, it is determined that a short circuit occurs between the touch unit 11 to be detected and the touch unit 10 with the current value(s) not 0; when the detection device 2 detects that the current values of all the touch units 10 are 0, it is determined that no short circuit occurs between the touch unit 11 to be detected and the rest of the touch units 10.
The detection device 2 is further configured to perform open circuit detection of the touch unit 10: selecting one of the touch units 10 as a touch unit 11 to be detected, wherein the detection device 2 stops providing the direct-current voltage to the touch unit 11 to be detected and provides a low potential to the rest of the touch units 10; the detection device 2 starts to detect the capacitance value of the touch unit 11 to be detected; when the detection device 2 detects that the capacitance value of the touch unit 11 to be detected is smaller than a preset threshold value, it is determined that an open circuit occurs in the touch unit 11 to be detected; when the detection device 2 detects that the capacitance value of the touch unit 11 to be detected is within the preset range, it is determined that the touch unit 11 to be detected is not open.
The detection device 2 includes a plurality of power supply devices 20, a plurality of current detection devices 30, and a plurality of capacitance detection devices 40 connected to the plurality of touch units 10 in a one-to-one correspondence manner, where the power supply device 20 is configured to provide a voltage to the touch units 10, the current detection device 30 is configured to detect a current value of the touch units 10, and the capacitance detection device 40 is configured to detect a capacitance value of the touch units 10.
Further, the detection device 2 can also obtain the short-circuit resistance value through the voltage difference between the touch unit 11 to be detected and the touch unit 10 short-circuited therewith, and the current value of the touch unit 11 to be detected.
Specifically, the direct current voltage is 4-6V, and the low potential is 0-1V.
Specifically, the capacitance value normally ranges from 80 to 120 PF.
Specifically, the preset threshold is 80 PF.
In summary, the touch unit detection method and the touch unit detection system of the embedded touch display panel according to the present invention connect a detection device to the outside of the embedded touch display panel, so that short circuit and open circuit detection can be performed on a plurality of touch units inside the embedded touch display panel at the Cell process stage of the embedded touch display panel, and detection of the touch units is not performed after the IC and the FPC are bonded to the display panel at the module process stage of the embedded touch display panel as in the prior art.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A method for detecting a touch unit of an in-cell touch display panel includes the following steps:
step S1, providing an in-cell touch display panel (1) and a detection device (2) connected to the in-cell touch display panel (1), wherein the in-cell touch display panel (1) includes: a plurality of touch units (10) arranged in an array;
step S2, short circuit detection of the touch unit (10):
selecting one of the touch units (10) as a touch unit (11) to be detected, wherein the detection device (2) provides a direct current voltage for the touch unit (11) to be detected and provides a low potential for the rest of the touch units (10); the detection device (2) starts to detect the current values of all the touch units (10); when the detection device (2) detects that the current value of one or more of the touch unit (11) to be detected and the rest of the touch units (10) is not 0, the short circuit between the touch unit (11) to be detected and the touch units (10) with the current value not 0 is judged; when the detection device (2) detects that the current values of all the touch units (10) are 0, judging that no short circuit occurs between the touch unit (11) to be detected and the rest of the touch units (10);
the detection device (2) comprises a plurality of power supply devices (20), a plurality of current detection devices (30) and a plurality of capacitance detection devices (40), wherein the power supply devices (20), the current detection devices (30) and the capacitance detection devices (40) are connected with the touch units (10) in a one-to-one correspondence mode, the power supply devices (20) are used for supplying voltage to the touch units (10), the current detection devices (30) are used for detecting the current values of the touch units (10), and the capacitance detection devices (40) are used for detecting the capacitance values of the touch units (10).
2. The method for detecting touch cells of an in-cell touch display panel of claim 1, further comprising step S3, repeating step S2 until all touch cells (10) have been detected for short circuits.
3. The method for detecting touch cells of an in-cell touch display panel according to claim 2, further comprising the step of performing an open circuit detection of the touch cells (10) in step S4:
selecting one of the touch units (10) as a touch unit (11) to be detected, wherein the detection device (2) stops providing direct-current voltage for the touch unit (11) to be detected and provides a low potential for the rest of the touch units (10); the detection device (2) starts to detect the capacitance value of the touch unit (11) to be detected; when the detection device (2) detects that the capacitance value of the touch unit (11) to be detected is smaller than a preset threshold value, it is judged that the touch unit (11) to be detected is open; when the detection device (2) detects that the capacitance value of the touch unit (11) to be detected is within the preset range, it is judged that the touch unit (11) to be detected is not open.
4. The method for detecting touch cells of an in-cell touch display panel of claim 3, further comprising the step S5 of repeating the step S4 until all of the touch cells (10) have been detected as open.
5. The method for detecting the touch units of the in-cell touch display panel according to claim 1, wherein the detection device (2) obtains the short-circuit resistance value according to the voltage difference between the touch unit (11) to be detected and the touch unit (10) short-circuited therewith and the current value of the touch unit (11) to be detected.
6. The method as claimed in claim 3, wherein the DC voltage is 4-6V; the low potential is 0-1V; the preset range of the capacitance value is 80-120 PF; the preset threshold value is 80 PF.
7. A touch unit detection system of an in-cell touch display panel comprises an in-cell touch display panel (1) and a detection device (2) connected with the in-cell touch display panel (1), wherein the in-cell touch display panel (1) comprises: a plurality of touch units (10) arranged in an array;
the detection device (2) is used for detecting the short circuit of the touch unit (10): selecting one of the touch units (10) as a touch unit (11) to be detected, wherein the detection device (2) provides a direct current voltage for the touch unit (11) to be detected and provides a low potential for the rest of the touch units (10); the detection device (2) starts to detect the current values of all the touch units (10); when the detection device (2) detects that the current value of one or more of the touch unit (11) to be detected and the rest of the touch units (10) is not 0, the short circuit between the touch unit (11) to be detected and the touch units (10) with the current value not 0 is judged; when the detection device (2) detects that the current values of all the touch units (10) are 0, judging that no short circuit occurs between the touch unit (11) to be detected and the rest of the touch units (10);
the detection device (2) comprises a plurality of power supply devices (20), a plurality of current detection devices (30) and a plurality of capacitance detection devices (40), wherein the power supply devices (20), the current detection devices (30) and the capacitance detection devices (40) are connected with the touch units (10) in a one-to-one correspondence mode, the power supply devices (20) are used for supplying voltage to the touch units (10), the current detection devices (30) are used for detecting the current values of the touch units (10), and the capacitance detection devices (40) are used for detecting the capacitance values of the touch units (10).
8. The touch cell detection system of an in-cell touch display panel according to claim 7, wherein the detection device (2) is further configured to perform an open circuit detection of the touch cell (10): selecting one of the touch units (10) as a touch unit (11) to be detected, wherein the detection device (2) stops providing direct-current voltage for the touch unit (11) to be detected and provides a low potential for the rest of the touch units (10); the detection device (2) starts to detect the capacitance value of the touch unit (11) to be detected; when the detection device (2) detects that the capacitance value of the touch unit (11) to be detected is smaller than a preset threshold value, it is judged that the touch unit (11) to be detected is open; when the detection device (2) detects that the capacitance value of the touch unit (11) to be detected is within the preset range, it is judged that the touch unit (11) to be detected is not open.
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| TWI478027B (en) * | 2012-12-28 | 2015-03-21 | Egalax Empia Technology Inc | Processing apparatus of optical touch system and operating method thereof |
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| CN101109782A (en) * | 2006-07-20 | 2008-01-23 | 微探测株式会社 | Noncontact type single side probe device and apparatus and method for testing open or short circuits of pattern electrodes using the same |
| CN103529354A (en) * | 2013-10-31 | 2014-01-22 | 京东方科技集团股份有限公司 | Circuit testing method and circuit testing system |
| CN206270464U (en) * | 2016-12-20 | 2017-06-20 | 深圳市燕麦科技股份有限公司 | A kind of FPC touch screen base plate Open Short test devices |
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