CN109144334B - Capacitive touch display device and display parameter detection method - Google Patents
Capacitive touch display device and display parameter detection method Download PDFInfo
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- CN109144334B CN109144334B CN201810791601.7A CN201810791601A CN109144334B CN 109144334 B CN109144334 B CN 109144334B CN 201810791601 A CN201810791601 A CN 201810791601A CN 109144334 B CN109144334 B CN 109144334B
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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
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a capacitive touch display device and a display parameter detection method. The single-side layout element of the optical sensor board and the design of the routing, the application of the conductive device, the application of the common ground structure and other technical means enable signals generated by the optical sensor board to be led out to the ground from the conductive device in an electrostatic mode, so that touch misjudgment of the capacitive touch screen is avoided.
Description
Technical Field
The invention belongs to the technical field of display detection, and particularly relates to a capacitive touch display device and a display parameter detection method.
Background
The medical diagnosis display needs to conform to the DICOM (Digital Imaging and communications in Medicine) standard, which makes the display need to be configured with a front optical sensor to determine whether the display meets the DICOM standard based on the real-time or timed detection of display parameters by the optical sensor.
In the conventional capacitive touch display device, as shown in fig. 1, the capacitive touch display device includes a display screen 1 and a capacitive touch screen 2 installed in front of the display screen 1, and an optical sensor 3 and an optical sensor board 4 thereof are installed in front of the display screen and used for detecting display parameters such as image optics or color coordinates of a display area of the display screen and sending data to a display driving module for application; because the preposed optical sensor 3 is also positioned in the effective touch action area of the capacitive touch screen 2, the detection signal of the preposed optical sensor interferes with the capacitive touch screen, so that the capacitance between the capacitive touch screen and the optical sensor plate is changed, and the capacitive touch screen has wrong touch judgment.
In order to avoid the interference of the optical sensor 3 to the capacitive touch screen 2, in the prior art, a structural design that a certain distance D is reserved between the optical sensor 3 and the capacitive touch screen 2 is adopted, but the structural design results in a larger overall thickness of the display.
Disclosure of Invention
The application provides a capacitive touch display device and a display parameter detection method, which solve the technical problem that the overall thickness of the existing capacitive touch display device is larger due to the use of a front optical sensor.
In order to solve the technical problems, the application adopts the following technical scheme:
the capacitive touch display device comprises a capacitive touch screen, a display screen arranged on the back side of the capacitive touch screen, and an optical sensor plate which are arranged between the capacitive touch screen and the display screen, wherein the optical sensor is arranged on the front side of the optical sensor plate, and a conductive device is fixed on the back side of the optical sensor plate and is fixed on the back side of the capacitive touch screen, so that the light-sensitive surface of the optical sensor faces the display screen; the back surface of the optical sensor board is not provided with a cloth piece and is not provided with a wire; the conducting device is grounded.
A method for detecting display parameters of a capacitive touch display device is provided, which is applied to the capacitive touch display device and includes: detecting an area of a capacitive touch screen with a fixed point; wherein the region where the fixing point exists is a mounting region of the optical sensor board; shielding touch induction of an area with a fixed point; judging whether a display parameter detection instruction is received or not; and if so, controlling to supply power to the optical sensor board so that the optical sensor starts to detect the display parameters of the display screen.
Compared with the prior art, the application has the advantages and positive effects that: in the capacitive touch display device and the display parameter detection method, the optical sensor plate is designed to be a plate with elements and wires arranged on the front surface, the conductive device is fixed on the back surface without the elements and the wires, the conductive device is fixed on the back surface of the capacitive touch screen, so that the light-sensing surface of the optical sensor faces the display screen, the conductive device is grounded, and signals generated by the optical sensor plate can be led out to the ground from the conductive device in an electrostatic mode even if the capacitance between the capacitive touch screen and the optical sensor plate is changed, so that the signals generated by the optical sensor plate are isolated by the conductive device and the capacitive touch screen, thereby avoiding touch misjudgment of the capacitive touch screen, realizing the effect of avoiding the interference of the optical sensor on the capacitive touch screen, and on the installation structure, because of the design of the elements and the wires arranged on the single surface of the optical sensor plate, The application of the conductive device and the application of the common-ground structure can directly fix the optical sensor plate on the back surface of the capacitive touch screen, and a distance does not need to be kept between the optical sensor and the capacitive touch screen, so that the interference of the optical sensor to the capacitive touch screen is avoided, the thickness of the display device is reduced, and the technical problem that the whole thickness of the existing capacitive touch display device is large due to the use of a front optical sensor is solved.
The capacitive touch display device can reduce the die sinking cost and the structure cost of a structural member for fixedly mounting the optical sensor plate, and reduces the manufacturing cost of the display device; the software and hardware configuration of the capacitive touch screen does not need to be modified, and the capacitive touch screen can be used universally in the traditional capacitive touch screen.
On the basis of reducing the structure thickness, in order to further ensure that the optical sensor does not interfere with the capacitive touch screen, in the display parameter detection method provided by the application, the detected fixed point area, namely the area where the optical sensor board is installed, is subjected to touch sensing shielding in a mode of detecting the fixed point area of the capacitive touch screen, so that the area does not sense capacitance change, and even if the capacitance between the capacitive touch screen and the optical sensor board changes obviously after the optical sensor board is powered on, touch misjudgment can be avoided because the touch of the area is shielded.
Other features and advantages of the present application will become more apparent from the detailed description of the embodiments of the present application when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a structural diagram of a capacitive touch display device in the prior art;
fig. 2 is a structural diagram of a capacitive touch display device according to the present application;
fig. 3 is a flowchart of a display parameter detection method of a capacitive touch display device according to the present application.
Detailed Description
The following describes embodiments of the present application in further detail with reference to the accompanying drawings.
The present application provides a capacitive touch display device, as shown in fig. 2, including a capacitive touch screen 22, a display screen 21 installed on the back side of the capacitive touch screen 22, and an optical sensor 23 and an optical sensor board 24 installed between the capacitive touch screen 22 and the display screen 21, wherein the optical sensor 23 is disposed on the front side of the optical sensor board 24, as shown in fig. 2, on the side facing the display screen. A conductive device 25 is fixed on the back surface of the optical sensor plate 24, and the conductive device 25 is fixed on the back surface of the capacitive touch screen 22, so that the light-sensing surface of the optical sensor 23 faces the display screen 21; wherein, the back of the optical sensor board 24 is not laid and not wired; and, the conductive device 25 is grounded. In the present embodiment, the back surface of the optical sensor plate 24 faces the capacitive touch panel 22, and the front surface thereof is provided with the optical sensor 23 facing the display screen 21.
As can be seen from the above, in the capacitive touch display device provided in the present application, the optical sensor board 24 is designed to be a board with elements and wires arranged on the front surface, the conductive device 25 is fixed on the back surface without elements and wires, the conductive device 25 is further fixed on the back surface of the capacitive touch screen 22, so that the light-sensing surface of the optical sensor 23 faces the display screen 21, and the conductive device 25 is connected to the ground, so that even if the capacitance between the capacitive touch screen 22 and the optical sensor board 24 changes, the signal generated by the optical sensor board 24 can be led out to the ground from the conductive device 25 in an electrostatic manner, so that the signal generated by the optical sensor board is isolated by the conductive device 25 and the capacitive touch screen 22, thereby avoiding the touch misjudgment of the capacitive touch screen 22, and achieving the effect of avoiding the interference of the optical sensor on the capacitive touch screen.
In the mounting structure, due to the design of the single-side layout elements and the routing of the optical sensor board 24, the application of the conductive device 25 and the application of the common ground structure, the optical sensor board 24 can be directly fixed on the back surface of the capacitive touch screen 22, and a distance does not need to be kept between the optical sensor 23 and the capacitive touch screen 22, so that the interference of the optical sensor on the capacitive touch screen is avoided, the thickness of the display device is reduced, and the technical problem that the overall thickness of the existing capacitive touch display device is large due to the use of a front optical sensor is solved. Compared with the prior art, the capacitive touch display device can reduce the die sinking cost and the structure cost of a structural member for fixedly mounting the optical sensor plate, and reduces the manufacturing cost of the display device; the software and hardware configuration of the capacitive touch screen does not need to be modified, the capacitive touch screen can be used universally in the traditional capacitive touch screen, and the difficulty in development and application is reduced.
In the embodiment of the present application, the conductive device 25 is connected to the capacitive touch screen 22 in a common ground manner to achieve grounding, that is, the conductive device 25 and the capacitive touch screen 22 are connected in a common ground manner to achieve a common ground between the optical sensor panel 24 and the capacitive touch screen 22, so that a signal generated by the optical sensor panel is electrostatically conducted out of the conductive device to the ground of the capacitive touch screen 22 by the conductive device when a capacitance between the capacitive touch screen and the optical sensor panel is changed.
In the implementation of the present application, the conductive device 25 is a conductive double-sided tape or a conductive thin film, the conductive double-sided tape directly adheres the optical sensor board 24 to the back of the capacitive touch screen 22 and is connected to the ground of the capacitive touch screen 22 through a connection line, the conductive thin film is fixed to the back of the capacitive touch screen 22, the optical sensor board 24 is adhered to the conductive thin film through a non-conductive double-sided tape, and the conductive thin film is connected to the ground of the capacitive touch screen 22 through a connection line.
Preferably, when the conductive double-sided adhesive tape or the conductive film is pasted and fixed, the edge of the conductive double-sided adhesive tape or the conductive film is connected with the metal frame of the capacitive touch screen 22, and the metal frame of the capacitive touch screen 22 is connected with the ground of the capacitive touch screen, so that the common ground of the conductive double-sided adhesive tape or the conductive film and the capacitive touch screen is realized, and the structure that the conductive device is connected with the metal frame of the capacitive touch screen is adopted, so that the connection design of the conductive device and a connecting line is simplified structurally, and the reliability of the structure can be improved.
In the capacitive touch display device, the optical sensor plate and the capacitive touch screen are directly fixed by using the conductive device, and the design that the conductive device and the capacitive touch screen are grounded is adopted, so that the optical sensor plate does not need to keep a distance with the capacitive touch screen; in the embodiment of the application, in order to further ensure that the optical sensor does not interfere with the capacitive touch screen, a display parameter detection method of the capacitive touch display device is further provided, and the capacitive touch screen is ensured not to be interfered by a detection signal of the optical sensor from the aspect of system execution.
As shown in fig. 3, the method for detecting display parameters of a capacitive touch display device provided in the present application is applied to the capacitive touch display device, and includes the following steps:
step S31: and detecting the area of the capacitive touch screen with a fixed point.
After the capacitive touch display device is powered on, the display screen and the capacitive touch screen are powered on firstly, the optical sensor board is not powered on, when the capacitive touch screen starts to work, the existence of the conductive device adhered to the back surface of the capacitive touch screen is detected, and the contact is not moved, the contact is judged to be a fixed point area, namely the area with the fixed point is the installation area of the optical sensor board in the application.
Step S32: and shielding the touch induction of the area with the fixed point.
After the fixed point area is determined, the touch sensing of the fixed point area is shielded, that is, the touch occurring in the fixed point area is not detected or the detection value is ignored, the touch determination is not performed on the area, but the fixed point area is still displayed normally.
Step S33: and judging whether a display parameter detection instruction is received or not.
When the capacitive touch screen needs to perform brightness stabilization, white balance verification and DICOM verification after the two steps are completed, a display parameter detection instruction is generated, and after the capacitive touch display device receives the display parameter detection instruction,
step S34: the control supplies power to the optical sensor board so that the optical sensor starts to detect the display parameters of the display screen.
The power supply module of the capacitive touch display device is controlled to supply power to the optical sensor plate, the display core module writes a driving program into the optical sensor, and at the moment, the optical sensor can work normally.
The optical sensor and the optical sensor board after normal operation detect information such as image optics or color coordinates of the display screen and send the detection data to the display core module, and the display core module performs backlight adjustment or image quality adjustment and the like based on the detection data, so that stable brightness, white balance verification, DICOM verification and the like are realized.
In this embodiment of the application, after the step S33 determines that the display parameter detection command is received, step S35 may be further executed, so as to further ensure that the capacitive touch screen is not interfered by the detection signal of the optical sensor, and step S35: controlling to stop driving the capacitive touch screen and recovering driving of the capacitive touch screen after set time; namely, the power supply of the capacitive touch screen driving module is cut off, the power supply is recovered after the set time, and the capacitive touch screen shields any touch during the cut-off period; after the power supply is resumed, the capacitive touch screen resumes to perform step S31, or performs step S33 again when the fixed point area is recorded.
Corresponding to the method for detecting the display parameters of the capacitive touch display device, the capacitive touch display device further includes the following modules: the device comprises a power supply module, a power supply control module, a capacitive touch screen driving module for driving a capacitive touch screen, a fixed point touch shielding module, a fixed point area recording module and the like.
The power supply module supplies power to the display screen 21, the capacitive touch screen 22, the optical sensor board 24 and the capacitive touch screen driving module; and the power supply control module is used for supplying power to the display screen 21 and the capacitive touch screen 22 after the capacitive touch display device is powered on, controlling the optical sensor board 24 to be powered off, and controlling the power supply module to supply power to the optical sensor board 24 after receiving a display parameter detection instruction.
The power supply control module is further configured to control to disconnect the power supply to the capacitive touch screen driving module after the optical sensor panel 24 is powered on, and control the power supply module to recover the power supply to the capacitive touch screen driving module after a set time.
The fixed point touch shielding module is used for detecting an area where a fixed point exists after the capacitive touch screen 22 is powered on, and shielding touch induction of the area where the fixed point exists; wherein the region where the fixing point exists is a mounting region of the optical sensor board; the fixed point area recording module is used for recording the position information of the fixed point area.
In the capacitive touch display device and the display parameter detection method provided by the application, the single-side layout elements and the routing design of the optical sensor board, the application of the conductive device, the application of the common ground structure and other technical means, so that even if the capacitance between the capacitive touch screen and the optical sensor plate is changed, the signal generated by the optical sensor plate can be led out to the ground from the conductive device in an electrostatic manner, thereby avoiding touch misjudgment of the capacitive touch screen, realizing the effect of avoiding the interference of the optical sensor to the capacitive touch screen, in the mounting structure, the optical sensor plate is directly fixed on the back of the capacitive touch screen, and a distance does not need to be kept between the optical sensor and the capacitive touch screen, so that the thickness of the display device is reduced, and the technical problem that the whole thickness of the existing capacitive touch display device is large due to the use of a front optical sensor is solved. On the basis of reducing the structure thickness, the technical means of shielding a fixed area of an optical sensor plate and disconnecting power supply of a capacitive touch screen driving module during detection is adopted, so that the optical sensor is further ensured not to generate interference on the capacitive touch screen.
It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also make changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. A capacitive touch display device comprises a capacitive touch screen, a display screen arranged on the back side of the capacitive touch screen, and an optical sensor plate arranged between the capacitive touch screen and the display screen, wherein the optical sensor is arranged on the front side of the optical sensor plate,
a conductive device is fixed on the back surface of the optical sensor plate and is fixed on the back surface of the capacitive touch screen, so that the light sensing surface of the optical sensor faces the display screen; the back surface of the optical sensor board is not provided with a cloth piece and is not provided with a wire;
the conducting device is grounded;
the capacitive touch display device further comprises a fixed point touch shielding module;
the fixed point touch shielding module is used for detecting an area of the capacitive touch screen where a fixed point exists and shielding touch induction of the area where the fixed point exists after the capacitive touch screen is electrified; wherein the region where the fixing point exists is a mounting region of the optical sensor board.
2. The capacitive touch display device according to claim 1, wherein the conductive device is a conductive double-sided tape or a conductive film.
3. The capacitive touch display device according to claim 2, wherein the edge of the conductive double-sided tape or the conductive film is connected to a metal frame of the capacitive touch screen; and the metal frame of the capacitive touch screen is connected with the ground of the capacitive touch screen.
4. The capacitive touch display device according to claim 1, further comprising a power supply module and a power supply control module;
the power supply module supplies power to the display screen, the capacitive touch screen and the optical sensor board.
5. The capacitive touch display device according to claim 4, wherein the power supply control module is configured to supply power to the display screen and the capacitive touch screen and control the optical sensor panel to power off after the capacitive touch display device is powered on; and after receiving a display parameter detection instruction, controlling the power supply module to supply power to the optical sensor board.
6. The capacitive touch display device according to claim 4, further comprising a capacitive touch screen driving module for driving the capacitive touch screen; the power supply module is also used for supplying power to the capacitive touch screen driving module;
the power supply control module is further used for controlling to cut off the power supply for the capacitive touch screen driving module after the optical sensor board is powered on, and controlling the power supply module to recover the power supply for the capacitive touch screen driving module after set time.
7. The capacitive touch sensitive display device of claim 1, wherein the conductive device is connected to a ground of the capacitive touch screen.
8. The method for detecting display parameters of a capacitive touch display device, applied to the capacitive touch display device according to any one of claims 1 to 3, comprises:
detecting an area of a capacitive touch screen with a fixed point; wherein the region where the fixing point exists is a mounting region of the optical sensor board;
shielding touch induction of an area with a fixed point;
judging whether a display parameter detection instruction is received or not; if so,
and controlling to supply power to the optical sensor board so that the optical sensor starts to detect the display parameters of the display screen.
9. The method of claim 8, wherein after determining that the display parameter detection command is received, the method further comprises:
and controlling to stop driving the capacitive touch screen and recovering driving of the capacitive touch screen after set time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810791601.7A CN109144334B (en) | 2018-07-18 | 2018-07-18 | Capacitive touch display device and display parameter detection method |
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| CN201810791601.7A CN109144334B (en) | 2018-07-18 | 2018-07-18 | Capacitive touch display device and display parameter detection method |
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| CN109144334A CN109144334A (en) | 2019-01-04 |
| CN109144334B true CN109144334B (en) | 2021-11-16 |
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