CN112987968A - Touch display device and control method thereof - Google Patents
Touch display device and control method thereof Download PDFInfo
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- CN112987968A CN112987968A CN202110149144.3A CN202110149144A CN112987968A CN 112987968 A CN112987968 A CN 112987968A CN 202110149144 A CN202110149144 A CN 202110149144A CN 112987968 A CN112987968 A CN 112987968A
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Images
Classifications
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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
-
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- 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
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention provides a touch display device and a control method thereof, wherein the touch display device is provided with a touch display mode, the touch display mode comprises a touch time interval, and the touch display device comprises: the touch control module receives a touch control driving signal in a touch control time interval; and the liquid crystal display module comprises a conductive back frame, and the conductive back frame is loaded with the touch driving signal in the touch time interval. According to the invention, the conductive back frame loads the touch driving signal in the touch time interval, so that the touch driving signal of the conductive back frame is offset with the touch driving signal received by the touch module, and the phenomenon that the backlight film material in the liquid crystal display module vibrates due to the change of the coupling electric field between the touch module and the conductive back frame to generate noise is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch display device and a control method thereof.
Background
At present, with the development of the medium-and small-sized electronic Display industry, the Display requirements of people on medium-and small-sized Liquid Crystal Displays (LCDs) are getting higher and higher. Since the lower the screen refresh rate, the more flickering and jittering the image display, the stronger the eye fatigue, and sometimes the eye soreness, dizziness, and the like are caused. In order to optimize the display screen to the maximum extent to improve the display experience, concepts such as high refresh rate are proposed. The most remarkable effect brought by the improvement of the screen refresh rate is the enhancement of the smoothness of the picture. However, for a liquid crystal Display panel using Touch and Display Integration (TDDI) technology, the higher the screen refresh rate is, the stronger the noise generated by the vibration of the backlight film material caused by Touch driving is.
Therefore, in order to optimize the user experience to the maximum extent while better improving the display effect, a scheme is required to solve the noise problem existing in the high refresh rate touch driving.
Disclosure of Invention
The invention aims to provide a touch display device and a control method thereof, which are used for solving the problem of noise in high-refresh-rate touch driving.
In order to realize the purpose, the technical scheme is as follows:
a touch display device having a touch display mode including a touch time period, the touch display device comprising:
the touch control module receives a touch control driving signal in the touch control time interval; and
the liquid crystal display module comprises a conductive back frame, and the conductive back frame is loaded with the touch driving signal in the touch time period.
A control method of a touch display device, the touch display device having a touch display mode including a touch time period, the touch display device comprising a liquid crystal display module and a touch module, the liquid crystal display module including a conductive back frame, the control method comprising:
and in the touch time interval, the touch module receives a touch driving signal and controls the conductive back frame to load the touch driving signal.
Has the advantages that: the invention provides a touch display device and a control method thereof.A conductive back frame loads a touch driving signal in a touch time interval so as to offset the touch driving signal of the conductive back frame and the touch driving signal received by a touch module, and avoid the occurrence of vibration and noise of a backlight film material in a liquid crystal display module due to the change of a coupling electric field between the touch module and the conductive back frame.
Drawings
Fig. 1 is a schematic view of a touch display device according to an embodiment of the invention;
FIG. 2 is a timing diagram of the driving of the LCD panel and the backlight module;
fig. 3 is a schematic view illustrating a coupling electric field formed between the touch module and the conductive back frame;
FIG. 4 is a schematic diagram of a multiplexer;
FIG. 5 is a schematic view of a bottom plate of the conductive back frame;
fig. 6 is a flowchart illustrating a control method of a touch display device according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Please refer to fig. 1, which is a schematic diagram of a touch display device according to an embodiment of the invention. The touch display device 100 includes a touch module 10 and a liquid crystal display module 20. The touch module 10 is disposed on the light emitting side of the liquid crystal display module 20, i.e., the touch display device 100 is an external touch display device. It is understood that the touch module 10 may also be disposed in the liquid crystal display module 20, i.e., the touch display device 100 may also be an in-cell touch display device.
In the present embodiment, the liquid crystal display module 20 includes a liquid crystal display panel 201, a backlight module 202, a driving chip 203 and a flexible printed circuit 204.
In the present embodiment, the backlight module 202 is used for emitting white light backlight. The backlight module 202 includes a conductive back frame 2021, an optical film 2022, a light guide plate 2023, a light bar set 2024, and a reflector 2025. The conductive back frame 2021 includes a bottom plate 20211 and side plates 20212, the side plates 20212 are disposed on the bottom plate 20211, and the four side plates 20212 and the bottom plate 20211 enclose to form an accommodating cavity. The reflective sheet 2025 is disposed in the accommodating cavity and located on the bottom plate 20211. The light bar group 2024 is disposed on the reflector 2025. The light guide plate 2023 is disposed above the light bar group 2024. The optical film 2022 is disposed on the light guide plate 2023, and the optical film 2022 includes a diffuser and a brightness enhancement film. The material of the conductive back frame 2021 may include aluminum or the like. The optical film 2022 is a polymer film.
In the present embodiment, the liquid crystal display panel 201 is used for receiving the backlight emitted from the backlight module 202 to display the image. The liquid crystal display panel 201 is disposed on the conductive back frame 2021 of the backlight module 202, the liquid crystal display panel 201 is located on the light emitting side of the backlight module 202, and the liquid crystal display panel 201 includes a thin film transistor array substrate and a color filter substrate opposite to the thin film transistor array substrate.
In the present embodiment, the touch module 10 includes a plurality of touch electrodes, and the touch electrodes may be self-capacitance touch electrodes or mutual capacitance touch electrodes. The touch electrode can be composed of metal grids, and the touch electrode can also be prepared from transparent conductive materials.
In the embodiment, the driving chip 203 integrates the functions of touch driving and display driving at the same time, that is, the touch display device 100 adopts the TDDI technology integrating touch driving and display driving. The driving chip 203 may output a touch driving signal to the touch module 10, or may output a display driving signal to the liquid crystal display panel 201. The driving chip 203 is disposed on the liquid crystal display module 20. Specifically, the driving chip 203 is bonded on the thin film transistor array substrate.
In the embodiment, one end of the flexible printed circuit board 204 is bound on the liquid crystal display module 20 and electrically connected to the driving chip 203, and the other end of the flexible printed circuit board 204 is bound on the conductive back frame 2021 of the backlight module 202. Specifically, one end of the flexible printed circuit board 204 is bound to the thin film transistor array substrate, and the other end of the flexible printed circuit board 204 is bound to the back surface of the base plate 20211.
In the present embodiment, the touch display device 100 has a touch display mode and a display mode. In the touch display mode, the touch module 10 is in an operating state to convert the touch operation into an electrical signal, the liquid crystal display module 20 is also in an operating state to perform display, and the touch display device 100 performs touch sensing and display simultaneously. The touch display mode comprises a touch time interval and a display time interval, and the touch time interval and the display time interval are carried out in a time-sharing mode. Fig. 2 shows a timing chart of driving the lcd panel and the backlight module. The STV1 is a start signal when the lcd panel displays a frame of screen, TP is a touch driving signal input to the touch module in the touch display mode, when the frequency of a frame is 60Hz, there are 18 touch periods t1 in a frame of screen, and the period between two adjacent touch periods t1 is a display period t 2. At each touch time t1, the driving chip 203 outputs a touch driving signal including a plurality of square waves 20a to the touch module 10; in each display period t2, the driving chip 203 outputs a display driving signal to the liquid crystal display panel 201. In the Display Mode (Display Mode), the lcd module 20 displays, the touch module 10 stops operating, and the driving chip 203 outputs a Display driving signal to the lcd panel 201.
When the touch display device 100 is in the touch display mode, the conductive back frame 2021 loads the touch driving signal while the touch module 10 receives the touch driving signal at the touch time period t 1. Specifically, as shown in fig. 2, STV2 is a start signal of the backlight module in one frame, TP 'is a touch driving signal loaded into the conductive back frame, and TP' is the same touch driving signal as TP. In one frame, the conductive back frame 2021 loads the same touch driving signal TP 'as the touch driving signal TP received by the touch module 10, and the conductive back frame 2021 loads the touch driving signal TP' including the square waves 20a in each touch period t 1.
As shown in fig. 3, since the difference between the touch driving signal received by the touch electrode of the touch module 10 and the touch driving signal loaded into the conductive back frame 2021 at any time point in the touch time period t1 is the same, a coupling electric field with a changed electric field intensity is not generated between the touch module 10 and the conductive back frame 2021, and thus the optical film 2022 located between the touch module 10 and the conductive back frame 2021 does not vibrate.
It should be noted that, the higher the frame frequency of the liquid crystal display panel is, for example, the frame frequency of the liquid crystal display panel is greater than or equal to 90Hz, the stronger noise is generated by the backlight film of the touch display device adopting the TDDI technology in the conventional technology, and the noise problem existing in the high frame frequency driving can be solved by loading the conductive back frame into the touch driving signal in the touch time period in the present invention.
In the embodiment, when the touch display device 100 is in the touch display mode, the conductive back frame 2021 receives the reference voltage signal during the display time period t2 to prevent the backlight module 202 from being interfered by electromagnetic waves and radio frequencies. Specifically, the reference voltage signal is a ground signal GND.
In the present embodiment, the driving chip 203 further includes a multiplexer 2031. As shown in fig. 4, which is a schematic diagram of the multiplexer. The multiplexer 2031 includes a first input terminal S1, a second input terminal S2, a third input terminal S3, a fourth input terminal S4, and an output terminal O. The first input terminal S1 is for receiving the touch driving signal TP, the second input terminal S2 is for receiving the ground signal GND, the third input terminal S3 is for receiving the selection signal Se, the fourth input terminal S4 is for receiving the enable signal En, and the output terminal O is electrically connected to the conductive back frame 2021. The circuit design inside the multiplexer 2031 may be implemented by the prior art, for example, the internal circuit design may include two parallel thin film transistors, when one thin film transistor is turned on by the selection signal Se, the touch driving signal TP is transmitted to the output terminal O, and when the other thin film transistor is turned on by the selection signal Se, the ground signal GND is transmitted to the output terminal O.
When the touch display device 100 enters the touch display mode, the multiplexer 2031 receives the valid enable signal En at the fourth input terminal S4, the multiplexer 2031 enters the working mode, and the multiplexer 2031 in the working mode selects one of the touch driving signal TP and the ground signal GND according to the selection signal Se and outputs the selected signal to the output terminal O.
Specifically, in the touch time period t1 of the touch display mode, the driving chip 203 transmits the touch driving signal TP to the multiplexer 2031, the multiplexer 2031 transmits the touch driving signal TP to the output terminal O according to the selection signal Se, the output terminal O outputs the touch driving signal TP to the conductive back frame 2021 through the flexible printed circuit board 204, and the conductive back frame 2021 receives the touch driving signal TP'; in the display period t2 of the touch display mode, the multiplexer 2031 transmits the ground signal GND to the output terminal O according to the selection signal Se, and the output terminal O outputs the ground signal GND to the conductive back frame 2021 through the flexible printed circuit board 204. The conductive back frame 2021 is continuously loaded with the ground signal GND during the display mode.
In the present embodiment, the touch display device 100 further includes a first input pin 205 and a second input pin 206. Referring to fig. 1 and 5, fig. 5 is a schematic view of a bottom plate of a conductive back frame. The first input pin 205 is disposed on the conductive back frame 2021 and is used for receiving a touch driving signal TP' output by the flexible printed circuit board 204. The second input pin 206 is disposed on the conductive back frame 2021 and is used for receiving a ground signal GND output by the flexible printed circuit board 204. Specifically, the first input pin 205 and the second input pin 206 are disposed on the back surface of the bottom plate 20211. The first input pin 205 and the second input pin 206 may be both copper sheets. The flexible printed circuit 204 is electrically connected to the first input pin 205 and the second input pin 206.
In this embodiment, the touch display device 100 further includes a detecting module (not shown), where the detecting module is configured to detect whether the touch display device receives a touch operation, and if so, the touch display device 100 enters a touch display mode; if not, the touch display device 100 enters a display mode. The driving chip 203 may include a detection module. The touch operation may include a touch operation, a sliding operation, a long-press operation, and the like, and the specific operation of the touch operation is not limited in the embodiment of the present invention.
The touch display device loads the touch driving signal in the touch time period through the conductive back frame, so that the touch driving signal of the conductive back frame is offset with the touch driving signal received by the touch module, and the phenomenon that the backlight film material in the liquid crystal display module vibrates due to the change of the coupling electric field between the touch module and the conductive back frame to generate noise is avoided.
The present invention further provides a control method of the touch display device, as shown in fig. 6, the control method includes:
step S10: when the touch display device is in the display mode, the detection module detects whether the touch display device receives a touch operation.
Specifically, the touch display device 100 may be an electronic device such as a mobile phone and a tablet. The detection module may detect when the touch display device 100 is powered on and enters the display mode, or may detect when the touch display device 100 is in the display mode after being powered on. When the touch display device 100 is in operation, the driving chip 203 is also in a normal operating state. The detection module detects whether touch operation, sliding operation, long-time pressing operation and the like are acted on the touch module.
Step S11: if so, the touch display device enters a touch display mode.
Specifically, when the detection module detects that the touch display device receives a touch operation, the touch display device 100 enters a touch display mode. In the touch time period, the touch module 10 controls the conductive back frame 2021 to load the touch driving signal while receiving the touch driving signal. During the display period, the conductive back frame 2021 is loaded with a ground signal.
Step S12: if not, the touch display device returns to the display mode.
Specifically, when the detection module detects that the touch display device does not receive the touch operation, the touch display device 100 continues to be in the display mode, and the conductive back frame 2021 loads the ground signal GND.
The above description of the embodiments is only for helping understanding the technical solution of the present invention and its core idea; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A touch display device having a touch display mode including a touch time period, the touch display device comprising:
the touch control module receives a touch control driving signal in the touch control time interval; and
the liquid crystal display module comprises a conductive back frame, and the conductive back frame is loaded with the touch driving signal in the touch time period.
2. The touch display device of claim 1, wherein the touch display mode further comprises a display period during which the conductive back frame receives a reference voltage signal.
3. The touch display device of claim 2, further comprising a multiplexer, the multiplexer comprising:
a first input end for receiving the touch driving signal;
a second input terminal for receiving the reference voltage signal;
the output end is electrically connected with the conductive back frame; and
a third input for receiving a selection signal;
the multiplexer selects one of the touch driving signal and the reference voltage signal to output to the output end according to the selection signal.
4. The touch display device of claim 3, wherein the multiplexer further comprises a fourth input, and the fourth input of the multiplexer receives an active enable signal in the touch display mode.
5. The touch display device according to claim 3, further comprising a driving chip, wherein the driving chip comprises the multiplexer, and the driving chip is disposed on the liquid crystal display module.
6. The touch display device according to claim 5, wherein in the touch time period, the driving chip is configured to output the touch driving signal to the touch module; and in the display time interval, the driving chip is used for outputting a display driving signal to the liquid crystal display module.
7. The touch display device of claim 5, further comprising a flexible printed circuit board electrically connecting the driving chip and the conductive back frame.
8. The touch display device according to claim 2 or 3, further comprising:
the first input pin is arranged on the conductive back frame and used for receiving the touch control driving signal; and
and the second input pin is arranged on the conductive back frame and used for receiving the reference voltage signal.
9. The touch display device according to claim 1, further having a display mode, further comprising:
the detection module is used for detecting whether the touch display device receives touch operation;
if so, the touch display device enters the touch display mode;
if not, the touch display device enters the display mode.
10. A control method of a touch display device is characterized in that the touch display device is provided with a touch display mode, the touch display mode comprises a touch time interval, the touch display device comprises a liquid crystal display module and a touch module, the liquid crystal display module comprises a conductive back frame, and the control method comprises the following steps:
and in the touch time interval, the touch module receives a touch driving signal and controls the conductive back frame to load the touch driving signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110149144.3A CN112987968A (en) | 2021-02-03 | 2021-02-03 | Touch display device and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110149144.3A CN112987968A (en) | 2021-02-03 | 2021-02-03 | Touch display device and control method thereof |
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| CN112987968A true CN112987968A (en) | 2021-06-18 |
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| CN202110149144.3A Pending CN112987968A (en) | 2021-02-03 | 2021-02-03 | Touch display device and control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106708338A (en) * | 2015-10-15 | 2017-05-24 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN110471558A (en) * | 2019-07-24 | 2019-11-19 | 武汉华星光电技术有限公司 | Touch control display apparatus and touch control display |
| CN111258457A (en) * | 2020-01-21 | 2020-06-09 | 京东方科技集团股份有限公司 | Touch display device |
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2021
- 2021-02-03 CN CN202110149144.3A patent/CN112987968A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106708338A (en) * | 2015-10-15 | 2017-05-24 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN110471558A (en) * | 2019-07-24 | 2019-11-19 | 武汉华星光电技术有限公司 | Touch control display apparatus and touch control display |
| CN111258457A (en) * | 2020-01-21 | 2020-06-09 | 京东方科技集团股份有限公司 | Touch display device |
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Application publication date: 20210618 |