CN107863076B - Stroke-segment type liquid crystal display driving circuit and driving method - Google Patents
Stroke-segment type liquid crystal display driving circuit and driving method Download PDFInfo
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- CN107863076B CN107863076B CN201711131824.2A CN201711131824A CN107863076B CN 107863076 B CN107863076 B CN 107863076B CN 201711131824 A CN201711131824 A CN 201711131824A CN 107863076 B CN107863076 B CN 107863076B
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- 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
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Abstract
The invention discloses a stroke-type liquid crystal display driving circuit and a driving method, comprising the following steps: the segment electrode driving unit, the segment electrode scanning line, the segment electrode, the common electrode driving unit, the common electrode scanning line and the common electrode, each driving cycle of the pen segment type liquid crystal display driving circuit comprises a first time interval and a second time interval, and the driving circuit further comprises: the first switch, the second switch, the switch control unit, the first touch control driving unit and the second touch control driving unit can enable the pen-segment type liquid crystal display to achieve a touch control function on the basis of having a display function, and are in a mutual capacitance mode, and compared with self-capacitance type touch sensing, the pen-segment type liquid crystal display is strong in environmental impact resistance.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a stroke-type liquid crystal display driving circuit and a driving method.
Background
Compared with the traditional display, the liquid crystal display has the advantages of light weight, thinness, low power consumption, low radiation and the like, and is widely applied to various industries and social life. The liquid crystal display may be classified into a pen-segment type and a dot matrix type according to display pixels, wherein the pen-segment type liquid crystal display is a device frequently used in a Portable Media Player (PMP), a computer, a POS terminal, an industrial control instrument device, and other home electronic devices.
Segment-type liquid crystal displays are commonly used for digital display or fixed text (graphics) display. The existing pen-segment type liquid crystal display sensing module generally comprises: the segment electrode driving unit, the segment electrode scanning line, the segment electrode, the common electrode driving unit, the common electrode scanning line, the common electrode, the touch control driving unit and the switch control unit are used for realizing the graphic display and touch control functions of the pen-segment type liquid crystal display. If the device using the pen-segment type liquid crystal display can be directly contacted with the ground, the potential of one end of the parasitic capacitor is GND which is a reference point of the potential, and the capacitance variation can be accurately detected when a finger touches the device. However, the existing pen-segment lcd with touch function adopts the self-capacitance mode, because one end of the self-capacitance screen capacitor is connected to GND, only one path of electrode is needed during operation: the segment electrode or the common electrode, one end of the parasitic capacitance of the self-capacitance mode can be influenced by the change of GND, and the resistance to environmental influence is poor, particularly in handheld devices, battery-powered devices and the like. The whole equipment is not directly connected to the socket by a power line, and the grounding property is poor, so that the use function of the self-capacitance touch screen on the equipment can be influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a segment type liquid crystal display driving circuit with strong environmental impact resistance and a driving method thereof.
The technical effect to be achieved by the invention is realized by the following scheme: a stroke-type liquid crystal display driving circuit comprising: the segment electrode driving unit, the segment electrode scanning line, the segment electrode, the common electrode driving unit, the common electrode scanning line and the common electrode, each driving cycle of the pen segment type liquid crystal display driving circuit comprises a first time interval and a second time interval, and the driving circuit further comprises: the touch control system comprises a first switch, a second switch, a switch control unit, a first touch control driving unit and a second touch control driving unit;
the first switch comprises a first contact a, a second contact b and a third contact c, the first contact a is connected with the scanning line of the segment electrode, the second contact b is connected with the segment electrode driving unit, the third contact c is connected with the first touch driving unit, and the first switch is used for conducting the first contact a and the second contact b or conducting the first contact a and the third contact c under the control of the switch control unit;
the second switch comprises a fourth contact A, a fifth contact B and a sixth contact C, the fourth contact A is connected with the common electrode scanning line, the fifth contact B is connected with the common electrode driving unit, and the sixth contact C is connected with the second touch driving unit. The second switch is used for conducting the fourth contact A and the fifth contact B or conducting the fourth contact A and the sixth contact C under the control of the switch control unit;
one end of the switch control unit is connected with the first switch, the other end of the switch control unit is connected with the second switch, and the switch control unit is used for controlling the conduction of a first contact a and a second contact B of the first switch in the first period so as to connect the segment electrode scanning line with the segment electrode driving unit, and controlling the conduction of a fourth contact A and a fifth contact B of the second switch so as to connect the common electrode scanning line with the common electrode driving unit; in the second time interval, controlling the first contact a and the third contact C of the first switch to be conducted so as to connect the segment electrode scanning line with the first touch control driving unit, and controlling the fourth contact a and the sixth contact C of the second switch to be conducted so as to connect the common electrode scanning line with the second touch control unit;
the first touch driving unit is used for sending scanning signals to the segment electrode scanning lines in the second time period, and the second touch driving unit is used for sending scanning signals to the common electrode scanning lines in the second time period so as to detect capacitance values between the common electrodes and the segment electrodes.
Preferably, the switch control unit is a timing control circuit.
Preferably, the first time interval and the second time interval in one driving cycle can be switched in sequence.
Preferably, the first touch driving unit and the second touch driving unit are analog-to-digital conversion circuits respectively.
Preferably, the first switch and the second switch are insulated gate field effect transistors, respectively.
A driving method applied to the pen-segment type liquid crystal display driving circuit is characterized in that the driving method comprises the following steps:
in a first time interval, a first contact and a second contact of a first switch are controlled to be conducted by a switch control unit so that a section electrode scanning line is connected with a section electrode driving unit, and a fourth contact and a fifth contact of the second switch are controlled to be conducted so that a common electrode scanning line is connected with the common electrode driving unit;
sending scanning signals to the segment electrode scanning lines by using the segment electrode driving unit, and sending scanning signals to the common electrode scanning lines by using the common electrode driving unit so as to realize image display;
in a second time interval, the switch control unit is used for controlling the conduction of a first contact and a third contact of the first switch so as to connect the section electrode scanning line with the first touch control driving unit, and controlling the conduction of a fourth contact and a sixth contact of the second switch so as to connect the common electrode scanning line with the second touch control driving unit;
and sending a scanning signal to the section electrode scanning line by using the first touch driving unit, and sending a scanning signal to the common electrode scanning line by using the second touch driving unit at the same time, so as to realize the detection of the capacitance value between the section electrode and the common electrode.
Preferably, the first time interval and the second time interval can be reversed in sequence.
Preferably, the common electrode scanning lines of the pen-segment liquid crystal display are multiple, the first period comprises first sub-periods with the same number as the common electrode scanning lines, and each first sub-period is equal;
the segment electrode driving unit is used for sending scanning signals to the segment electrode scanning lines, and the common electrode driving unit is used for sending scanning signals to the common electrode scanning lines, so that the image display is realized as follows: and sending scanning signals to the segment electrode scanning lines by using the segment electrode driving unit, and simultaneously sending the scanning signals of the first sub-period to each common electrode scanning line by using the common electrode driving unit in sequence so as to realize the display of images.
Preferably, the second period is equal to or not equal to the first sub-period.
Preferably, the second period comprises a plurality of equal second sub-periods, the second sub-periods being equal or not equal to the first sub-periods.
The invention has the following advantages:
1. the pen-section type liquid crystal display realizes a touch function on the basis of having a display function by adding the first switch, the second switch, the switch control unit, the first touch control driving unit and the second touch control driving unit on the basis of a driving circuit in the prior art, and has a mutual capacitance type touch control function which is strong in environmental impact resistance compared with self-capacitance type touch induction;
2. by adopting the sequential circuit design of the first time interval and the second time interval and the order of the first time interval and the second time interval in one driving cycle can be exchanged, the circuit design can be carried out according to the actual condition of equipment applying the pen-segment type liquid crystal display, and then the order exchange of touch control and display is realized.
Drawings
FIG. 1 is a driving circuit diagram of a segment-type liquid crystal display according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for driving a segment-type LCD according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a driving method of a segment-type LCD according to a second embodiment of the present invention;
FIG. 4 is a timing diagram of a driving method of a segment-type LCD according to an embodiment of the present invention;
fig. 5 is a timing chart of a driving method of a segment-type liquid crystal display according to a second embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the drawings, wherein examples of the embodiments are shown in the drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, an embodiment of the invention provides a pen-type lcd driver circuit, each driving cycle of the pen-type lcd driver circuit includes a first time period t1 and a second time period t2, the circuit includes: the segment electrode driving unit 1, the segment electrode scanning line 2, the segment electrode 3, the common electrode driving unit 4, the common electrode scanning line 5 and the common electrode 6, in addition to the above structure, the driving circuit further includes: the first switch S1, the second switch S2, the switch control unit 7, the first touch driving unit 8 and the second touch driving unit 9;
wherein the first switch S1 includes a first contact a connected to the segment electrode scan line 2, a second contact b connected to the segment electrode driving unit 1, and a third contact c connected to the first touch driving unit 8, and the first switch S1 is configured to conduct the first contact a and the second contact b or the first contact a and the third contact c under the control of the switch control unit 7;
the second switch S2 includes a fourth contact a, a fifth contact B, and a sixth contact C, where the fourth contact a is connected to the common electrode scan line 5, the fifth contact B is connected to the common electrode driving unit 4, and the sixth contact C is connected to the second touch driving unit 9. The second switch S2 is used for conducting the fourth contact a with the fifth contact B or conducting the fourth contact a with the sixth contact C under the control of the switch control unit 7;
the switch control unit 7 has one end connected to the first switch S1 and the other end connected to the second switch S2, and is configured to control the conduction of the first contact a and the second contact B of the first switch S1 so as to connect the segment electrode scanning line 2 to the segment electrode driving unit 1 and control the conduction of the fourth contact a and the fifth contact B of the second switch S2 so as to connect the common electrode scanning line 5 to the common electrode driving unit 4 in the first period t 1; during the second time period t2, the first contact a and the third contact C of the first switch S1 are controlled to be conducted to connect the segment electrode scanning line 2 with the first touch driving unit 8, and the fourth contact a and the sixth contact C of the second switch S2 are controlled to be conducted to connect the common electrode scanning line 5 with the second touch driving unit;
the first touch driving unit 8 is configured to send a scan signal to the segment electrode scan line 2 in the second time period t2, and the second touch driving unit 9 is configured to send a scan signal to the common electrode scan line 5 in the second time period t2, so as to detect a capacitance value between the common electrode 6 and the segment electrode 3. In the second time period t2, the segment electrode 3 and the common electrode 6 form two poles of a capacitor, when a finger touches, the coupling capacitance changes, and the first touch driving unit 8 or the second touch driving unit 9 detects the variation of the coupling capacitance to determine the position touched by the finger, thereby implementing the touch sensing function.
It should be noted that "connected" in this embodiment means that the two are electrically connected and conducted with each other.
Specifically, the switch control unit 7 controls the first contact a to be alternately in contact conduction with the second contact B and the third contact C, and controls the fourth contact a to be alternately in contact conduction with the fifth contact B and the sixth contact C. When the switch control unit 7 controls the first contact a and the second contact b of the first switch S1 to be conducted, the first contact a and the third contact c are in an off state, the segment electrode driving unit 1 is electrically connected to the segment electrode scanning line 2, and the segment electrode driving unit 1 can output a scanning signal to the segment electrode scanning line 2 to scan the segment electrode scanning line 2, so as to drive the segment electrode 3 connected to the segment electrode scanning line 2; meanwhile, the switch control unit 7 controls the fourth contact a and the fifth contact B of the second switch S2 to be conducted, the fourth contact a and the sixth contact C are in a disconnected state, the common electrode driving unit 4 is electrically connected with the common electrode scanning line 5, and the common electrode driving unit 4 outputs a scanning signal to the common electrode scanning line 5 to scan the common electrode scanning line 5, so as to drive the common electrode 6 connected with the common electrode scanning line 5; therefore, an ac voltage is applied to the segment electrode 3 and the common electrode 6 to drive the liquid crystal molecules between them to deflect, so that the liquid crystal display displays the image.
When the switch control unit 7 controls the first contact a and the third contact c of the first switch S1 to be turned on, the first contact a and the second contact b are in an off state, the first touch driving unit 8 is electrically connected to the segment electrode scanning line 2, and the touch driving unit can output a scanning signal to the segment electrode scanning line 2 to scan the segment electrode scanning line 2, so as to detect the segment electrode 3 connected to the segment electrode scanning line 2; meanwhile, the switch control unit 7 controls the fourth contact a and the sixth contact C of the second switch S2 to be turned on, the fourth contact a and the fifth contact B are in a disconnected state, the second touch driving unit 9 is electrically connected to the common electrode scanning line 5, and the second touch driving unit 9 can output a scanning signal to the common electrode scanning line 5 to scan the common electrode scanning line 5, so as to detect the common electrode 6 connected to the common electrode scanning line 5; through the above process, a coupling capacitor is formed between the common electrode 6 and the segment electrode 3, when a finger touches, the coupling capacitor changes, and the first touch driving unit 8 or the second touch driving unit 9 judges and detects the variation of the coupling capacitor, determines the position touched by the finger, and performs corresponding touch function processing.
It is emphasized that the switch control unit 7 controls the time duration of the graphic display of the liquid crystal display by controlling the contact conduction time of the first contact a and the second contact B of the first switch S1 and the contact conduction time of the fourth contact a and the fifth contact B of the second switch S2, wherein the time duration is the first time period t 1; correspondingly, the switch control unit 7 also controls the touch sensing time of the liquid crystal display by controlling the contact conduction time of the first contact a and the third contact C of the first switch S1 and the contact conduction time of the fourth contact a and the sixth contact C of the second switch S2, where the time is the second time period t 2.
As shown in fig. 4, the scanning driving time of one frame (i.e. one driving cycle) in the present embodiment can be divided into a graphic display time (i.e. a first time period t 1) and a touch sensing time (i.e. a second time period t 2), and since the basic time unit of the lcd during the scanning driving is a frame, the first time period t1 and the second time period t2 are performed alternately, which is expressed by the following working processes of the actual driving circuit: the switch control unit 7 controls the first contact a and the second contact B of the first switch S1 and the fourth contact a and the fifth contact B of the second switch S2 to conduct for a first period t1, then controls the first contact a and the second contact B to be disconnected, and makes the first contact a and the third contact c conduct for a second period t2, and controls the fourth contact a and the fifth contact B to be disconnected, and makes the fourth contact a and the sixth contact conduct for a second period t2, then controls the first contact a and the third contact c to be disconnected, and makes the first contact a and the second contact B conduct for a first period t1, …, and so on.
In addition, as shown in fig. 5, the scanning driving time of one frame (i.e. one driving cycle) in the embodiment can be divided into a touch sensing time (i.e. the first time period t 1) and a graphic display time (i.e. the second time period t 2), and since the basic time unit of the lcd during the scanning driving is a frame, the first time period t1 and the second time period t2 are alternately performed, which is expressed by the following operation processes of the actual driving circuit: the switch control unit 7 controls the first contact a and the third contact C of the first switch S1 and the fourth contact a and the sixth contact C of the second switch S2 to conduct for a first period t1, then controls the first contact a and the third contact C to be disconnected, and makes the first contact a and the second contact B conduct for a second period t2, and controls the fourth contact a and the sixth contact C to be disconnected, and makes the fourth contact a and the fifth contact B conduct for a second period t2, then controls the first contact a and the second contact B to be disconnected, and makes the first contact a and the third contact C conduct for a first period t1, …, and so on.
In this embodiment, the first switch S1 and the second switch S2 are preferably insulated gate field effect transistors, respectively.
In the segment-type lcd driving circuit provided in this embodiment, the switch control unit 7 is preferably a timing control circuit.
In the production process, the program time (i.e. the first time interval and the second time interval t 2) of the timing control circuit can be set according to the actual situation, and after the liquid crystal display is started, the timing control circuit can automatically switch the contact conduction between different contacts according to the set program.
In this embodiment, the first touch driving unit 8 and the second touch driving unit 9 are analog-to-digital conversion circuits, respectively.
When the capacitance between the segment electrode 3 and the common electrode 6 changes (for example, when the display screen is touched by hand), the analog-to-digital conversion circuit detects the voltage value between the segment electrode 3 and the common electrode 6, and converts the voltage value from an analog signal to a digital signal for feedback.
The pen-segment lcd driving circuit provided in this embodiment is added with the first switch S1, the second switch S2, the switch control unit 7, the first touch driving unit 8, and the second touch driving unit 9 on the basis of the driving circuit in the prior art, so that the pen-segment lcd realizes the touch function on the basis of having the display function, and is a mutual capacitive touch function, which is stronger in environmental impact resistance than self-capacitive touch sensing.
On the other hand, many electronic devices today have high requirements on signal-to-noise ratio (SNR), such as MP3 players, which can affect sound quality if the SNR is too low; for example, the signal-to-noise ratio of the portable DVD should be at least above 70 db to meet the standard, and the pen-segment liquid crystal display with the mutual capacitance touch function provided by the embodiment of the present invention can effectively improve the signal-to-noise ratio, and the larger the ratio of the signal-to-noise ratio, the better the effect.
The embodiment of the invention also provides a stroke-type liquid crystal display driving method which is applied to the stroke-type liquid crystal display driving circuit.
Example one
As shown in fig. 2, the method for driving a segment-type lcd includes:
in the first period t1, the switch control unit 7 is used to control the first contact and the second contact of the first switch S1 to be conducted so as to connect the segment electrode scanning line 2 with the segment electrode driving unit 1, and to control the fourth contact and the fifth contact of the second switch S2 to be conducted so as to connect the common electrode scanning line 5 with the common electrode driving unit 4;
sending a scanning signal to the segment electrode scanning line 2 by using the segment electrode driving unit 1, and sending a scanning signal to the common electrode scanning line 5 by using the common electrode driving unit 4 to realize the display of an image;
in a second time period t2, the switch control unit 7 is used to control the first contact and the third contact of the first switch S1 to be conducted so as to connect the segment electrode scanning line 2 with the first touch driving unit 8, and to control the fourth contact and the sixth contact of the second switch S2 to be conducted so as to connect the common electrode scanning line 5 with the second touch driving unit 9;
and sending a scanning signal to the segment electrode scanning line 2 by using the first touch driving unit 8, and sending a scanning signal to the common electrode scanning line 5 by using the second touch driving unit 9, so as to detect a capacitance value between the segment electrode 3 and the common electrode 6.
In the driving method, the graphic display scanning is performed in the first time period t1, the touch sensing scanning is performed in the second time period t2, the scanning time of one cycle is completed, and then the graphic display and the touch sensing are repeatedly and alternately performed, wherein the repetition cycle is the first time period t1 plus the second time period t 2.
Example two
As shown in fig. 3, the method for driving a segment-type lcd includes:
in the first period t1, the switch control unit 7 is used to control the conduction of the first contact and the third contact of the first switch S1, so as to connect the segment electrode scanning line 2 with the first touch driving unit 8, and to control the conduction of the fourth contact and the sixth contact of the second switch S2, so as to connect the common electrode scanning line 5 with the second touch driving unit 9;
sending a scanning signal to the segment electrode scanning line 2 by using the first touch driving unit 8, and sending a scanning signal to the common electrode scanning line 5 by using the second touch driving unit 9, so as to detect a capacitance value between the segment electrode 3 and the common electrode 6;
during a second time period t2, the switch control unit 7 is used to control the first contact and the second contact of the first switch S1 to conduct so as to connect the segment electrode scanning line 2 with the segment electrode driving unit 1, and the fourth contact and the fifth contact of the second switch S2 to conduct so as to connect the common electrode scanning line 5 with the common electrode driving unit 4;
and sending a scanning signal to the segment electrode scanning lines 2 by using the segment electrode driving unit 1, and sending a scanning signal to the common electrode scanning lines 5 by using the common electrode driving unit 4 at the same time, so as to realize the display of an image.
In the driving method, the touch sensing scanning is performed in the first time period t1, the graphic display scanning is performed in the second time period t2, the scanning time of one cycle is completed, and then the touch sensing and the graphic display are repeatedly and alternately performed, wherein the repetition cycle is the first time period t1 plus the second time period t 2.
That is, the sequence of the first time period t1 and the second time period t2 in the driving cycle of the second embodiment and the first embodiment can be changed, and the circuit design can be performed according to the actual situation of the device using the pen-segment type liquid crystal display, so as to change the sequence of touch control and display. For example, in an intelligent refrigerator, when the refrigerator door is opened and closed, the temperature in the refrigerator and the opening and closing state of the door are mainly displayed, and a touch function is not used, and the sequential circuit design of firstly displaying and then touching can be considered; when the temperature of the refrigerator or the function of the refrigeration mode is adjusted, the touch function is firstly used, the intelligent system performs A/D conversion through touch induction and then completes display, and at the moment, the sequential circuit design is firstly touched and then displayed.
Taking a pen-segment liquid crystal display with 1/4 duty ratio as an example, fig. 4 and 5 are timing diagrams of two driving methods of the pen-segment liquid crystal display provided by the present embodiment, wherein V L CD, 2/3V L CD, 1/3V L CD and VSS represent different output voltages, COM1, COM2, COM3 and COM4 represent different common electrode scan lines 5, and Tframe represents a scan driving time of one frame (i.e., one driving period).
Taking fig. 4 as an example, the driving method of the pen-segment type lcd provided in this embodiment divides the scanning driving time Tframe of one frame into two time segments: in the first time period t1 and the second time period t2, after the first time period t1 finishes scanning the common electrode scanning lines 5COM 1-COM 4, the second time period t2 scans the common electrode scanning lines 5 again, the first time period t1 also scans the segment electrode scanning lines 2 by the segment electrode driving unit 1, and the second time period t2 also scans the segment electrode scanning lines 2 by the first touch driving unit 8 and the common electrode scanning lines 5 by the second touch driving unit 9, so that the scanning driving time Tframe of one frame includes a period of graphic display time and a period of touch sensing time.
The pen-segment type liquid crystal display driving method provided by the embodiment of the invention has the advantages that the mutual capacitance type touch induction is adopted, so that the liquid crystal display is strong in environmental impact resistance, and is particularly suitable for handheld or battery-powered equipment and the like.
In practical applications, the common electrode scanning lines 5 of the pen-segment type lcd are preferably multiple, and the first period t1 includes the same number of first sub-periods as the number of the common electrode scanning lines 5, and each of the first sub-periods is equal;
the segment electrode driving unit 1 is used for sending scanning signals to the segment electrode scanning lines 2, and the common electrode driving unit 4 is used for sending scanning signals to the common electrode scanning lines 5, so as to display images as follows: and sending a scanning signal to the segment electrode scanning lines 2 by using the segment electrode driving unit 1, and simultaneously sending the scanning signal of the first sub-period to each common electrode scanning line 5 by using the common electrode driving unit 4 in sequence so as to realize the display of an image.
It should be noted that the second time period t2 may be equal to or different from the first sub-time period.
The second period t2 preferably includes a plurality of equal second sub-periods, which may or may not be equal to the first sub-period.
In addition, the ratio between the first time period t1 and the second time period t2 (the ratio between the graphic display time and the touch sensing time) is preferably determined according to the duty ratio of the pen-type liquid crystal display and the number of touch keys. The time is typically 16.7 milliseconds for graphical display. As for the touch sensing time, theoretically, the conversion of the analog-to-digital conversion circuits inside the first touch driving unit 8 and the second touch driving unit 9 is completed, and the time is generally several milliseconds to several tens milliseconds.
The pen-segment type liquid crystal display driving circuit in the embodiment of the invention is mainly applied to Portable Media Players (PMP), computers, POS terminals, industrial control instrument equipment and other household electronic equipment.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A stroke-type liquid crystal display driving circuit comprising: the segment electrode driving unit, the segment electrode scanning line, the segment electrode, the common electrode driving unit, the common electrode scanning line and the common electrode, each driving cycle of the pen segment type liquid crystal display driving circuit comprises a first time interval and a second time interval, and the driving circuit is characterized by further comprising: the touch control system comprises a first switch, a second switch, a switch control unit, a first touch control driving unit and a second touch control driving unit;
the first switch comprises a first contact a, a second contact b and a third contact c, the first contact a is connected with the scanning line of the segment electrode, the second contact b is connected with the segment electrode driving unit, the third contact c is connected with the first touch driving unit, and the first switch is used for conducting the first contact a and the second contact b or conducting the first contact a and the third contact c under the control of the switch control unit;
the second switch comprises a fourth contact A, a fifth contact B and a sixth contact C, the fourth contact A is connected with the common electrode scanning line, the fifth contact B is connected with the common electrode driving unit, the sixth contact C is connected with the second touch driving unit, and the second switch is used for conducting the fourth contact A and the fifth contact B or conducting the fourth contact A and the sixth contact C under the control of the switch control unit;
one end of the switch control unit is connected with the first switch, the other end of the switch control unit is connected with the second switch, and the switch control unit is used for controlling the conduction of a first contact a and a second contact B of the first switch in the first period so as to connect the segment electrode scanning line with the segment electrode driving unit, and controlling the conduction of a fourth contact A and a fifth contact B of the second switch so as to connect the common electrode scanning line with the common electrode driving unit; in the second time interval, controlling the first contact a and the third contact C of the first switch to be conducted so as to connect the segment electrode scanning line with the first touch control driving unit, and controlling the fourth contact a and the sixth contact C of the second switch to be conducted so as to connect the common electrode scanning line with the second touch control unit;
the first touch driving unit is used for sending scanning signals to the segment electrode scanning lines in the second time period, and the second touch driving unit is used for sending scanning signals to the common electrode scanning lines in the second time period so as to detect capacitance values between the common electrodes and the segment electrodes;
the driving method of the pen-segment type liquid crystal display driving circuit comprises the following steps:
in a first time interval, a first contact and a second contact of a first switch are controlled to be conducted by a switch control unit so that a section electrode scanning line is connected with a section electrode driving unit, and a fourth contact and a fifth contact of the second switch are controlled to be conducted so that a common electrode scanning line is connected with the common electrode driving unit;
sending scanning signals to the segment electrode scanning lines by using the segment electrode driving unit, and sending scanning signals to the common electrode scanning lines by using the common electrode driving unit so as to realize image display;
in a second time interval, the switch control unit is used for controlling the conduction of a first contact and a third contact of the first switch so as to connect the section electrode scanning line with the first touch control driving unit, and controlling the conduction of a fourth contact and a sixth contact of the second switch so as to connect the common electrode scanning line with the second touch control driving unit;
and sending a scanning signal to the section electrode scanning line by using the first touch driving unit, and sending a scanning signal to the common electrode scanning line by using the second touch driving unit so as to realize the detection of the capacitance value between the section electrode and the common electrode.
2. The pen-segment LCD driving circuit of claim 1, wherein the switch control unit is a timing control circuit.
3. The pen-segment LCD driving circuit as claimed in claim 1, wherein the first time segment and the second time segment in a driving cycle are sequentially switched.
4. The pen-segment LCD driver circuit of claim 1, wherein the first touch driver unit and the second touch driver unit are analog-to-digital conversion circuits, respectively.
5. The pen-segment liquid crystal display driving circuit according to claim 1, wherein the first switch and the second switch are insulated gate field effect transistors, respectively.
6. The pen-segment LCD driving circuit as claimed in claim 1, wherein the first time segment and the second time segment are sequentially switched.
7. The driving circuit of claim 1, wherein the common electrode scan lines of the segment type LCD are plural, the first period comprises the same number of first sub-periods as the common electrode scan lines, and each of the first sub-periods is equal;
the segment electrode driving unit is used for sending scanning signals to the segment electrode scanning lines, and the common electrode driving unit is used for sending scanning signals to the common electrode scanning lines, so that the image display is realized as follows: and sending scanning signals to the segment electrode scanning lines by using the segment electrode driving unit, and simultaneously sending the scanning signals of the first sub-period to each common electrode scanning line by using the common electrode driving unit in sequence so as to realize the display of images.
8. The pen-segment LCD driving circuit of claim 7, wherein the second period is equal to or not equal to the first sub-period.
9. The pen-segment LCD driving circuit as claimed in claim 7, wherein the second period comprises a plurality of equal second sub-periods, the second sub-periods being equal to or not equal to the first sub-periods.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103413538A (en) * | 2013-08-27 | 2013-11-27 | 信利半导体有限公司 | Stroke-segment-type liquid crystal display driving circuit and driving method |
| CN103728755A (en) * | 2012-10-11 | 2014-04-16 | 丽智科技股份有限公司 | Thin film transistor liquid crystal display device with touch control function |
| CN104122699A (en) * | 2013-04-25 | 2014-10-29 | 丽智科技股份有限公司 | Touch display with in-plane steering liquid crystal structure |
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| CN104020908B (en) * | 2014-05-30 | 2017-03-01 | 京东方科技集团股份有限公司 | A kind of driving method of In-cell touch panel, device and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103728755A (en) * | 2012-10-11 | 2014-04-16 | 丽智科技股份有限公司 | Thin film transistor liquid crystal display device with touch control function |
| CN104122699A (en) * | 2013-04-25 | 2014-10-29 | 丽智科技股份有限公司 | Touch display with in-plane steering liquid crystal structure |
| CN103413538A (en) * | 2013-08-27 | 2013-11-27 | 信利半导体有限公司 | Stroke-segment-type liquid crystal display driving circuit and driving method |
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