WO2019061729A1

WO2019061729A1 - Display device and drive method therefor

Info

Publication number: WO2019061729A1
Application number: PCT/CN2017/111189
Authority: WO
Inventors: 黄北洲
Original assignee: 惠科股份有限公司
Priority date: 2017-09-27
Filing date: 2017-11-15
Publication date: 2019-04-04
Also published as: CN107564487A

Abstract

A display device and a drive method, the display device comprises: multiple pixels, data signal lines (104, S(1), S(2), ... S(i), ... S(N)) that provide data signals to the multiple pixels; scan signal lines (105, G(1), G(2), ... G(j), ... G(M)) arranged to intersect the data signal lines (104, S(1), S(2), ... S(i), ... S(N)); and a driver circuit (300) that outputs a scan signal (VG) to the scan signal lines (105, G(1), G(2), ... G(j), ... G(M)) so as to actuate the scan signal lines (105, G(1), G(2), ... G(j), ... G(M)); the driver circuit (300) outputs a voltage having a waveform that has a voltage level change cycle, where the voltage level of the waveform of the scan signal (VG) rises at a slope (S1, S3) of a first pre-configured value, such that when the waveform of the scan signal (VG) rises, the waveform has a portion that changes at the slope (S1, S3) of the first pre-configured value in the range between the high voltage level and the low voltage level, thereby enabling a display device not to have an afterimage.

Description

Display device and driving method thereof

Technical field

[0001] Embodiments of the present application relate to the field of display devices, and in particular, to a display device and a driving method thereof.

Background technique

[0002] With the rapid advancement of thin film transistor manufacturing technology, liquid crystal displays have a large number of applications for personal digital assistants (PDAs), notebook computers, digital cameras, and photos due to their advantages of lightness, power saving, and no radiation. Video recorders, mobile phones and other electronic products. Coupled with the industry's active investment in research and development and the use of large-scale production equipment, the quality of displays has been continuously improved, and the price has continued to rise, which has led to the rapid expansion of the application field of liquid crystal displays.

[0003] Currently, a thin film transistor liquid crystal display (TFT-LCD) includes a plurality of scanning signal lines and a scanning driving circuit thereof, a plurality of data lines and data driving circuits thereof, a plurality of common electrode lines, and a plurality of Pixel units, etc. Specifically, each of the pixel units is formed at an intersection of a scanning signal line on the glass substrate and a corresponding data line, wherein the scanning signal line and the data signal line are perpendicular to each other. Moreover, a thin film transistor is provided at the intersection of the scanning signal line and the data signal line to drive the pixel unit, thereby producing a wide variety of colorful images.

[0004] However, in a necessary structure of each of a plurality of pixels of the conventional display device, it is unavoidable to additionally form a parasitic capacitance Cgd between the gate and the drain of the thin film transistor. Therefore, when the scanning voltage Vgh rises, the level shift Vd shifts by the level of the parasitic capacitance Cgd AVd. The level shift AVd of the non-scanning voltage of the scan signal (the voltage at which the thin film transistor is in the off state) Vgl and the level shift Vd caused by the parasitic capacitance Cgd formed in the thin film transistor is unavoidable, which can be expressed It is: AVd = Cgdx (Vgh - Vgl) I (Clc + Cs + Cgd) , which causes problems such as flickering of an image and deterioration of display, which is disadvantageous for a display device requiring higher definition and higher performance.

technical problem

[0005] A technical problem to be solved by embodiments of the present application is to provide a display device to effectively avoid the defect that an existing display device has an increase in display quality due to generation of parasitic capacitance. A technical problem to be further solved by the embodiments of the present application is to provide a driving method of a display device, so as to effectively avoid the defect that the display device has an increase in display quality due to the generation of parasitic capacitance.

Problem solution

Technical solution

[0007] To solve the above technical problem, the embodiment of the present application first provides a display device, including:

a plurality of pixels;

Providing a data signal line of the data signal to the plurality of pixels;

[0010] being set to a scanning signal line that intersects the data signal line;

[0011] outputting a scan signal to the scan signal line to actuate a drive circuit of the scan signal line;

[0012] wherein, the voltage level of the waveform of the scan signal rises in a slope manner of a first predetermined value, so that the waveform of the scan signal is within a range between a high voltage level and a low voltage level of the rising threshold A portion that varies with the slope of the first predetermined value.

[0013] Optionally, the driving circuit includes:

[0014] having a cascaded shift register composed of a plurality of flip-flops;

[0015] a plurality of selections are respectively connected to the plurality of triggers, and respectively turned on or off according to the output of the corresponding plurality of triggers;

[0016] A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of a waveform of the scan signal to be outputted to the scan signal line.

[0017] Optionally, the voltage has a period of one scan period in length and has a waveform including a period of the voltage level change.

[0018] Optionally, the driving circuit outputs a full-cycle waveform to the scan signal line during a scan period, and outputs a voltage level not greater than the voltage level during a period other than the scan period The end voltage level of the change.

[0019] Optionally, the number of the data signal lines is the same as the number of the scanning signal lines.

[0020] Optionally, the display device further includes: a first circuit, the first circuit has:

[0021] a capacitor connected to an input terminal of the drive circuit;

[0022] a voltage source connected to an input terminal of the driving circuit by the first switch;

[0023] connected to the resistor of the capacitor in parallel by the second switch; [0024] wherein the drive circuit outputs a voltage having a waveform from the capacitor of the circuit.

[0025] Optionally, the display device further includes:

a second circuit, the second circuit having:

[0027] an operational amplifier that receives a voltage source with a non-inverting input terminal;

[0028] a first resistor, one end of the first resistor is connected to a non-inverting input terminal of the operational amplifier, and the other end of the first resistor is connected to the voltage source;

[0029] a second resistor, the second resistor is connected to the non-inverting input terminal of the operational amplifier, and the other end of the second resistor is grounded;

[0030] a third resistor connected to the inverting input terminal of the operational amplifier;

[0031] a fourth resistor connected as a feedback resistor between the inverting input terminal and the output terminal of the operational amplifier;

[0032] wherein the driving circuit outputs a voltage having a waveform from the operational amplifier of the circuit.

[0033] Optionally, the second circuit satisfies R1=R4, R2=R3, A=R4/R3, where R1 is a resistance value of the first resistor, and R2 is a resistance of the second resistor A value, R3 is a resistance value of the third resistor, R4 is a resistance value of the fourth resistor, and A is a magnification of the operational amplifier.

[0034] Optionally, the second circuit further has: a constant current source, an input resistor, and an input capacitor, wherein the constant current source is connected to one end of the input capacitor through the input resistor, and The other end of the input capacitor is grounded, the constant current source and the input resistor are connected in series, and the series circuit of the constant current source and the input resistor is connected in parallel with the input capacitor, the third resistor A device is coupled to the input resistor and a connection node of the input capacitor.

[0035] Optionally, the first resistor, the second resistor, and the third resistor have a resistance greater than the input resistor.

[0036] Optionally, the second circuit further has: a switch, the switch is connected in parallel with the input capacitor, and the switch is connected in parallel with the series circuit of the constant current source and the input resistor .

[0037] Optionally, the operational amplifier and the first resistor, the second resistor, the third resistor, and the fourth resistor constitute a differential amplifying circuit as a subtraction portion, in the subtraction The following subtraction is performed in the section: VDlb=Vddx[R2/ (R1+R2) ]x[l+ (R4/R3) ]

- (R4/R3) xVct, where VDlb is the output voltage of the operational amplifier, and Vdd is the voltage source R1 is a resistance value of the first resistor, R2 is a resistance value of the second resistor, R3 is a resistance value of the third resistor, and R4 is a resistance value of the fourth resistor, Vet Is the voltage of the input capacitor.

[0038] Optionally, the second circuit satisfies VDlb=VDD−AxVct, where VDlb is an output voltage of the operational amplifier, Vdd is the voltage source, A is a magnification of the operational amplifier, and Vet is The voltage of the input capacitor.

[0039] Optionally, the second circuit satisfies Vslope=Vcthx (R4/R3), where Vslope is a slope amount,

Vcth is the maximum amplitude of the voltage of the input capacitor, R3 is the resistance value of the third resistor, and R4 is the resistance value of the fourth resistor.

[0040] On the other hand, an embodiment of the present application further provides a driving method of a display device, including:

[0041] providing a data signal to a plurality of pixels through a data signal line;

[0042] outputting a scan signal to a scan signal line disposed to intersect the data signal line to drive the scan signal line by using a driving circuit;

[0043] wherein, the voltage level of the waveform of the scan signal rises in a slope manner of a first predetermined value, so that the waveform of the scan signal is within a range between a high voltage level and a low voltage level of the rising threshold A portion that varies with the slope of the first predetermined value.

[0044] Optionally, the driving circuit includes:

[0045] having a cascaded shift register composed of a plurality of flip-flops;

[0046] a plurality of selections are respectively connected to the plurality of triggers, respectively, and respectively turned on or off according to the output of the corresponding plurality of triggers;

And a plurality of control devices respectively connected to the input terminals of the plurality of selection switches, and controlling a slew rate of a rising waveform of the scan signal to be output to the scan signal line.

[0048] Optionally, the driving method further includes: using a first circuit, where the first circuit has:

a capacitor connected to an input terminal of the drive circuit;

[0050] a voltage source connected to an input terminal of the driving circuit through the first switch;

[0051] a resistor connected in parallel to the capacitor through the second switch;

[0052] wherein the drive circuit outputs a voltage having a waveform from the capacitor of the circuit.

[0053] In another aspect, the embodiment of the present application further provides a display device, including: [0054] a plurality of pixels;

[0055] providing a data signal line of the data signal to the plurality of pixels;

[0056] being set to a scanning signal line that intersects the data signal line;

[0057] outputting a scan signal to the scan signal line to actuate a drive circuit of the scan signal line;

[0058] wherein, the voltage level of the waveform of the scan signal rises in a slope manner of a first predetermined value and decreases in a slope manner of a second predetermined value, so that the waveform of the scan signal is at a high voltage level of rising 吋a portion between the low voltage levels having a slope of the first predetermined value and a waveform of the scan signal being within a range between a high voltage level and a low voltage level of the falling threshold a portion of the slope of the second predetermined value that varies;

[0059] wherein, the first predetermined value and the second predetermined value are opposite to each other;

[0060] wherein the driving circuit comprises:

[0061] having a cascaded shift register composed of a plurality of flip-flops;

[0062] a plurality of selections are respectively connected to the plurality of triggers, and respectively turned on or off according to the output of the corresponding plurality of triggers;

[0063] A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of rising and falling waveforms of the scan signals to be output to the scan signal lines.

Advantageous effects of the invention

Beneficial effect

[0064] By adopting the above technical solution, the embodiment of the present application has at least the following beneficial effects: The embodiment of the present application enables the waveform near the input terminal of the scanning signal line and the vicinity of the terminal to be delayed from being delayed by the parasitic capacitance of the scanning signal line. The influence of the characteristics is substantially the same, that is, the scanning signal is not distorted, and the generation rate of the voltage level shift is lowered, thereby effectively improving the display quality of the display device.

Brief description of the drawing

DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present application. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings. 1 is a schematic structural diagram of a display device according to an embodiment of the present application.

2 is a circuit diagram of a scanning signal line driving circuit of a display device according to an embodiment of the present application.

3 is a waveform diagram showing an output of a scanning signal line drive circuit of a display device according to an embodiment of the present application.

4 is another waveform diagram of an output of a scanning signal line drive circuit of a display device according to an embodiment of the present application.

5 is still another waveform diagram of an output of a scanning signal line drive circuit of a display device according to an embodiment of the present application.

6 is a first circuit diagram of a circuit of a display device and a scanning signal line drive circuit of another embodiment of the present application.

7 is a waveform diagram showing an output of a scanning signal line driving circuit of a display device according to another embodiment of the present application.

8 is another waveform diagram of an output of a scanning signal line driving circuit of a display device according to another embodiment of the present application.

9 is another waveform diagram of an output of a scanning signal line driving circuit of a display device according to another embodiment of the present application.

10 is a circuit diagram of a second circuit of a display device and a scanning signal line driver circuit according to still another embodiment of the present application.

11 is a waveform diagram showing an output of a scanning signal line drive circuit of a display device according to still another embodiment of the present application.

12 is a flow chart showing the steps of a driving method of the display device of the present application.

13 is a flow chart showing the steps of a driving method of a display device according to another embodiment of the present application.

14 is a flow chart showing the steps of a driving method of a display device according to still another embodiment of the present application.

Embodiments of the invention

[0080] The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is apparent that the described embodiments are part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application, without departing from the inventive work, are within the scope of the present application.

1 is a schematic structural view of a display device according to an embodiment of the present application, and FIG. 2 is a circuit diagram of a scanning signal line driving circuit of the display device according to the embodiment of the present application. 3 is a waveform diagram showing an output of a scanning signal line drive circuit of the display device of the embodiment of the present application.

[0082] As shown in FIG. 1 , the display device provided by the embodiment of the present application includes an array arranged on the display panel 1 . a plurality of data signal lines 104 respectively providing data signals to the plurality of pixels (including the pixel electrodes 103), and a plurality of scanning signal lines 105 disposed to intersect the data signal lines 104, wherein the data signals The number of lines 104 may be the same as the number of the scanning signal lines 105, and a driving circuit portion connected to the display panel 1 and outputting a scanning signal to the scanning signal lines 105 to actuate the scanning signal lines 105. The driving circuit portion includes a scanning signal line driving circuit 300, a data signal line driving circuit 200, and a counter electrode driving circuit COM, which are respectively connected to the scanning signal line 105, the data signal line 104, and the opposite substrate 101 of the display panel. The control circuit 600 is a circuit for controlling the data signal line drive circuit 200 and the scan signal line drive circuit 300.

[0083] For example, as shown in FIG. 1, the display panel 1 can be formed by sealing a composition between a pair of electrode substrates and applying a deflecting plate to the outer surface of the electrode substrate. The thin film transistor array substrate as one of the electrode substrates is formed by arranging a plurality of data signal lines 104 (S (1) , S ( 2 ) , ... S in an array form on a transparent insulating substrate 100 made of, for example, glass. (i) , ...S (N) ) and a plurality of scanning signal lines 105 (G (1) , G (2) , ... G (j) , ... G (M) ) crossing each other And formed. A switching device 102 is formed at the boundary of the plurality of data signal lines 104 and the plurality of scanning signal lines 105, and the switching device 102 is constituted by a thin film transistor connected to the pixel electrode 103. In detail, a plurality of scanning signal lines 105 (G (1) , G (2) , ... G (j) , ... G (M) ) are connected to the thin film transistor (ie, the switching device 102) a gate, and a plurality of data signal lines 104 (S (1), S (2), ... S (i), ... S (N)) are connected to the thin film transistor (ie, the switching device 102) The drain. Further, an alignment film which covers almost all of the pixel electrode 103 may be provided. Thus, a transistor array substrate is formed.

[0084] As shown in FIG. 2, the scanning signal line drive circuit 300 includes a shift register portion 3a composed of cascades of M flip-flops F1, F2, F3, ..., Fj, ... FM, and a flip-flop F1. The selection of F2, F3, ...Fj, ...FM is turned on or off. In response to the chopping clock signal GCK, the gate start signal GSP may be sequentially transmitted through the plurality of flip-flops F1, F2, F3, ..., Fj . . . FM, and sequentially output to the plurality of selection gates 3b , to trigger multiple selections to close 3b. In the same manner, when an input terminal of each of the selection switches 3b is supplied with a shared voltage VD2 that is sufficient for the switching device 102 to achieve the off state as shown in FIG. 2, each selection switch 3b selects a scan of a low voltage level. The voltage VG, and a low voltage level scan voltage VG is output to the scan signal line 105 during one scan period to turn off the thin film transistor (i.e., the pass device 102 as shown in FIG. 1). Conversely, this 吋, when choosing each of the other 3b The input terminals supply a shared voltage VD1 that is sufficient to bring the switching device 102 (see FIG. 1) to an on state, and each selection switch 3b selects a high voltage level of the scan voltage VG and applies a high voltage during one scan period. The level of the scanning voltage VG is output to the scanning signal line 105 to turn on the thin film transistor (i.e., the switching device 102 as shown in FIG. 1). By this operation, an image signal (see Fig. 1) output from the data signal line drive circuit 200 to each of the data signal lines 104 (see Fig. 1) can be written in each corresponding pixel (including the pixel electrode 103).

[0085] Specifically, in order to more accurately control the rising slope S1 of the scan signal VG, the scan signal line drive circuit 300 may further include a plurality of control devices SC that scan the output of the signal line drive circuit 300. level. In detail, in the off state of the switching device 102, each control device SC is disposed between the shared voltage VD2 and the selection switch 3b; and when the switching device 102 is turned to the on state, each control device SC is set Between the shared voltage VD1 and the selection of the gate 3b. The control device SC can be used to control the scanning signal output from the scanning signal line driving circuit 300 to the plurality of scanning signal lines 105 (G (1) , G (2) , ... G (j ) , ... G (M) ) The voltage of the VG waveform rises by the slew rate (linear rate).

[0086] With the above arrangement, it is possible to control a plurality of scanning signals respectively output to the plurality of scanning signal lines 105 (G (1), G (2), ... G (j), ... G (M) ) The rising slope SI of VG is such that the voltage level of the waveform of the scanning signal VG rises by the slope S1 of the first predetermined value as shown in FIG. 3, so that the waveform of the scanning signal VG rises to a high voltage level and a low voltage. There is a portion within the range between the levels that varies with the slope of the first predetermined value.

1 is a schematic structural view of a display device according to an embodiment of the present application, and FIG. 2 is a scanning signal line driving circuit of the display device of the embodiment of the present application. FIG. 4 is another waveform diagram of the output of the scanning signal line driving circuit of the display device of the embodiment of the present application.

. The display device and the scanning signal line drive circuit shown in Figs. 1 and 2 have been described in detail above, and therefore will not be described again.

[0088] In order to more precisely control the rising slope S1 and the falling slope S2 of the scanning signal VG, the scanning signal line driving circuit 300 may further include a plurality of control devices SC that scan the output of the signal line driving circuit 300 level. In detail, in the off state of the switching device 102, each control device SC is disposed between the shared voltage VD2 and the selection switch 3b; and when the switching device 102 is turned to the on state, each control device SC is set Between the shared voltage VD1 and the selection of the gate 3b. Control device SC can be used to control the sweep The voltage of the waveform of the scanning signal VG outputted to the plurality of scanning signal lines 105 (G (1), G (2), ... G (j), ... G (M)) by the signal line driving circuit 300 rises And falling yaw rate (linear rate)

[0089] Through the above arrangement, a plurality of scanning signals respectively output to the plurality of scanning signal lines 105 (G (1), G (2), ... G (j), ... G (M) ) can be controlled The rising slope SI of the VG and the falling slope S2, so that the voltage level of the waveform of the scanning signal VG rises by the slope S1 of the first predetermined value and decreases by the slope S2 of the second predetermined value, as shown in FIG. The waveform of the scan signal VG has a portion that varies with the slope of the first predetermined value within a range between the high voltage level and the low voltage level of the rising 吋, and causes the waveform of the scan signal VG to be at a high voltage of the falling 吋a portion between the flat and low voltage levels having a slope that varies with the second predetermined value, wherein the absolute values of the first predetermined value and the second predetermined value may be the same (ie, the first The predetermined value and the second predetermined value are opposite to each other, and may be different, which means that the rising slope S1 and the falling slope S2 of the waveform of the scanning signal VG may be the same (ie, the rising slope S1 and the falling value) Slope S2 mutual For the opposite, it can be different.

1 is a schematic structural view of a display device according to an embodiment of the present application, and FIG. 2 is a scanning signal line driving circuit of the display device according to the embodiment of the present application. FIG. 5 is still another waveform diagram of the output of the scanning signal line driving circuit of the display device of the embodiment of the present application.

In order to more precisely control the falling slope S2 of the scanning signal VG, the scanning signal line driving circuit 300 may further include a plurality of control devices SC that scan the output stages of the signal line driving circuit 300. In detail, in the off state of the switching device 102, each control device SC is disposed between the shared voltage VD2 and the selection switch 3b; and when the switching device 102 is turned to the on state, each control device SC is set Between the shared voltage VD1 and the selection of the gate 3b. The control device SC can be used to control the scanning signal output from the scanning signal line driving circuit 300 to the plurality of scanning signal lines 105 (G (1), G (2), ... G (j), ... G (M) ) The voltage of the VG waveform drops by the slew rate (linear rate).

[0092] With the above arrangement, a plurality of scanning signals respectively output to the plurality of scanning signal lines 105 (G (1), G (2), ... G (j), ... G (M)) can be controlled VG's falling slope S2, so as shown in Figure 3, The voltage level of the waveform of the scan signal VG is decreased by the slope S2 of the second predetermined value, so that the waveform of the scan signal VG is within the range between the high voltage level and the low voltage level of the falling 吋The portion of the slope of the predetermined value that changes.

[0093] In this way, the waveform near the input terminal of the scanning signal line and the vicinity of the terminal is not affected by the signal delay propagation characteristics caused by the parasitic capacitance of the scanning signal line, and is substantially the same, that is, the output scanning signal is not distorted. Further, it is possible to effectively reduce the generation rate of the voltage level shift AVd, and realize a display device having no display defect such as a residual image.

[0094] In particular, the voltage may have a period of one scan period, and may have a waveform including a period of the voltage level change, and the driving circuit may pass the scan signal during a scan period. The line outputs a full period waveform, and the voltage level output during a period other than the scan period is not greater than the end voltage level at which the voltage level changes.

6 and FIG. 7, wherein FIG. 6 is a circuit diagram of a first circuit of a display device and a scan signal line driver circuit according to another embodiment of the present application, and FIG. 7 is the other of the present application. A waveform diagram of the output of the scanning signal line drive circuit of the display device of the embodiment. The structure of the scanning signal line driving circuit 300 different from the above-described embodiment is provided with a control device SC for controlling the rising slope S3 of the scanning signal VG. In the other embodiment, the control device SC is not used, but The first circuit shown in FIG. 6 is provided in place of the control device SC and the trace signal line drive circuit 300.

As shown in FIG. 6, the first circuit used in conjunction with the scanning signal line driving circuit 300 includes a resistor Rent and a capacitor Ccnt for charging and discharging, an inverter INV for controlling charging and discharging, and the like. The switching states SW1 and SW2 are switched between the charging state and the discharging state, and the shared voltage VD11 generated by the first circuit is like the input voltage VD1 shown in FIG. 2 as the input voltage of the selection signal of the scanning signal line driving circuit 300.

[0097] For the detailed structural configuration, the voltage source Vdd is applied to one terminal of the first switch SW1, and the other terminal of the first switch SW1 is connected to the input of the selection switch 3b of the scan signal line drive circuit 300. The terminal, that is, the voltage source Vdd is connected to the scanning signal line drive circuit 300 through the first switch SW1. The other terminal of the switch SW1 is connected to one terminal of the resistor Rent and one terminal of the capacitor Cent, and the terminal of the resistor Rent and the terminal of the capacitor Cent are connected to the selection of the scanning signal line drive circuit 300. The input terminal of the gate 3b, wherein the other terminal of the resistor Rent passes through the gate SW2 is grounded. The voltage source Vdd may be a DC voltage having a high voltage level, which is sufficient for the thin film transistor to be in an on state, for example, 15V to 20V, but not limited thereto. In the closed state of the second switch SW2, the resistor Rent is connected in series with the second switch SW2, and the serial circuit of the resistor Rent and the second switch SW2 is connected in parallel with the capacitor Cent.

On the other hand, the signal Stc from the outside is transmitted as an input signal to the inverter INV, and the signal Stc is inverted by the inverter INV to control the SW2. For example, the signal Stc can be synchronized with each scanning period and also used to control the opening and closing control of SW1. The signal Stc can also be arranged in synchronism with the chirp signal GCK and generated, for example, by using a mono multivibrator (not shown), but is not limited thereto.

[0099] For example, when the signal Stc is at a high voltage level (charge control signal) 吋, the switch SW1 is closed, and the switch SW2 is broken due to the low voltage level applied to the switch SW2 through the inverter INV. The voltage source Vdd is supplied with power to the capacitor Cent to cause the capacitor Cent to start storing the electric charge, and the shared voltage VDla is output as a high voltage level to one input terminal of the selection switch 3b of the scanning signal line drive circuit 300. Conversely, when the signal Stc is at a low voltage level (discharge control signal), the switch SW1 is turned off, and the switch SW2 is closed due to the high voltage level voltage applied to the switch SW2 through the inverter INV, and is stored in the capacitor.

The charge in the Cent is discharged by the resistor Rent, and the voltage level of the scan signal output from the scanning signal line drive circuit 300 is gradually lowered.

[0100] In addition, the rising slope S3 can be adjusted by changing the resistance of the resistor Rent and the capacitance of the capacitor Cent.

The voltage level of the scan signal outputted by the scanning signal line drive circuit 300 is increased by a slope S3 of a first predetermined value as shown in FIG. 7, so that the waveform of the scan signal is at a high voltage level and a low voltage of rising 吋. There is a portion in the range between the levels that varies with the slope of the first predetermined value, thereby optimizing for each display panel 1 to be driven.

6 and FIG. 8, wherein FIG. 6 is a circuit diagram of a first circuit of a display device and a scanning signal line driver circuit of another embodiment of the present application, and FIG. 8 is another embodiment of the present application. Another waveform diagram of the output of the scanning signal line drive circuit of the display device of the embodiment. The first circuit described in FIG. 6 has been described in detail above, and thus will not be described again.

[0102] The rising slope S3 and the falling can be adjusted by changing the resistance of the resistor Rent and the capacitance of the capacitor Cent. The slope S4 causes the voltage level of the scan signal outputted by the scanning signal line drive circuit 300 to rise as shown by the slope S3 of the first predetermined value and decrease by the slope S4 of the second predetermined value as shown in FIG. The waveform of the signal has a portion that varies with the slope of the first predetermined value and a waveform of the scan signal at a high voltage level and a low voltage of the falling 吋 in a range between a high voltage level and a low voltage level of the rising 吋The portion between the levels has a portion that varies with the slope of the second predetermined value, thereby optimizing for each of the liquid crystal display panels 1 to be driven.

6 and FIG. 9, wherein FIG. 6 is a circuit diagram of a first circuit of a display device and a scanning signal line driver circuit configured according to another embodiment of the present application, and FIG. 9 is the other of the present application. Still another waveform diagram of the output of the scanning signal line drive circuit of the display device of the embodiment. The first circuit described in FIG. 6 has been described in detail above, and thus will not be described again.

[0104] The falling slope S4 can be adjusted by changing the resistance of the resistor Rent and the capacitance of the capacitor Cent such that the voltage level of the scanning signal output by the scanning signal line driving circuit 300 is a slope of the second predetermined value as shown in FIG. The S4 mode is decreased such that the waveform of the scan signal has a portion that varies with the slope of the second predetermined value within a range between the high voltage level and the low voltage level of the falling chirp, thereby for each display to be driven Panel 1 is optimized.

10 and FIG. 11, wherein FIG. 10 is a circuit diagram of a second circuit of a display device and a scanning signal line driver circuit according to still another embodiment of the present application, and FIG. 11 is another A waveform diagram of an output of a scanning signal line drive circuit of the display device of the embodiment.

[0106] The switch SW3 is connected in parallel with the capacitor Cct and in parallel with the series circuit of the constant current source let and the input resistor Ret. The signal Stc may be a slope turn-off control signal (a charge control signal and a discharge control signal), and the switch SW3 connected in parallel with the capacitor Cct is controlled to be turned on or off at a specific turn. The constant current source let is connected to one end of the capacitor Cct through the resistor Ret, and the other end of the capacitor Cct is grounded, that is, the constant current source let and the resistor Ret are connected in series, and the constant current source let and the resistor Ret are connected in series The circuit is connected in parallel with the capacitor Cct. One end of the resistor R3 is connected to the inverting input terminal OP of the operational amplifier and the other end of the resistor R3 is connected to the connection node of the resistor Ret and the capacitor Cct, and the voltage Vet outputted by the capacitor Cct (that is, the potential difference across the capacitor Cct) is passed. Resistor R3 is delivered to the inverting input terminal of operational amplifier OP. The resistor R4 is connected between the inverting input terminal and the output terminal of the operational amplifier OP, the output terminal of the operational amplifier OP and the input terminal of the selection of the scanning signal line driving circuit 300 Connected, the shared voltage VD1b output from the operational amplifier OP is like the input voltage VD1 shown in FIG. 2 as the input voltage of the selection of the scanning signal line drive circuit 300. The non-inverting input terminal of the operational amplifier OP is connected to one end of the resistor R2 and one end of the resistor R1, and the other end of the resistor R2 is grounded, and the voltage source Vdd is applied to the other end of the resistor R1. unit. Specifically, each of the resistors R1, R2, R3, and R4 may have a resistance greater than the resistor Rct.

[0107] The operational amplifier OP and the resistors R1, R2, R3, and R4 constitute a differential amplifying circuit as a subtraction portion.

Perform the following subtraction in the subtraction section: VDlb=Vdd x [R2/ (Rl + R2) ]x[l + (R4/R3) ] - (R4/R3) x Vct, where VDlb is the output voltage of the op amp Vdd is the voltage source, and Vet is the voltage of the input capacitor. Here, the resistance values of the resistors R1, R2, R3 and R4 are made to satisfy R1=R4, R2=R3, A=R4/R3, and satisfy the following Condition: VDlb=VDD_AxVct, where VDlb is the output voltage of the operational amplifier, Vdd is the voltage source, A is the amplification factor of the operational amplifier, Vet is the voltage of the input capacitor, and when the signal Stc is at a low voltage The level is 吋, and the SW3 is broken. In this state, power is supplied from the constant current source let through the resistor Ret to the capacitor Cct storing the charge, and the voltage Vet has a waveform as shown in FIG. In the subtraction section, the voltage source Vdd subtracts the product of the voltage Vet from the operational amplifier's amplification ratio A = (R4/R3), and the resulting voltage output is used as the output signal VDlb. Therefore, the output signal VDlb can be raised by the desired rising slope Vslope by changing the amplification factor A of the operational amplifier, such as the slope of the Vslope from the potential Vgh.

Conversely, when the signal Stc is at the high voltage level 幵, the switch SW3 is closed. Therefore, the electric charge stored in the capacitor Cct is discharged through the switch SW3, and the voltage output from the capacitor Cct becomes zero. In the subtraction portion, the voltage source Vdd subtracts the product of the voltage Vet and the amplification factor A=(R4/R3) of the operational amplifier, but the voltage Vet is zero, and the voltage source Vdd is output as the output signal VDlb to the scanning signal line driving circuit. 300.

As shown in FIG. 11, with the control of the signal Stc, the waveform of the voltage Vet has the maximum amplitude Vcth, and the waveform of the output signal VDlb has the slope Tslope and the slope amount Vslop _e . The slope amount Vslope satisfies: Vslope=Vcthx (R4 / R3) .

Therefore, the slope can be easily adjusted by appropriately setting the resistances of the resistors R3 and R4 so that the voltage level of the scan signal outputted by the scanning signal line drive circuit 300 is inclined by the first predetermined value as shown in FIG. The rate mode is increased, so that the waveform near the input terminal of the scanning signal line and the vicinity of the terminal is not distorted by the signal delay propagation characteristics of the scanning signal line parasitically, and the voltage level shift Vd can be effectively reduced. The rate further realizes a display device having no display defects such as a residual image.

Please refer to FIG. 12, which is a flow chart of the steps of the driving method of the display device of the present application. The present application provides a driving method for a display device including the following steps S11~S12:

[0112] Step S11: providing a data signal to the plurality of pixels through a data signal line;

[0113] Step S12: outputting a scan signal to the scan signal line disposed to intersect the data signal line to activate the scan signal line by using a driving circuit, wherein the scan signal includes a voltage having a waveform of a voltage level change period And wherein the voltage level rises in a slope manner of a first predetermined value such that a waveform of the scan signal has a first predetermined value within a range between a high voltage level and a low voltage level of the rising chirp The part of the slope change.

[0114] Specifically, the driving circuit includes:

[0115] having a cascaded shift register composed of a plurality of flip-flops;

[0116] a plurality of selections are respectively connected to the plurality of triggers, respectively, and respectively turned on or off according to the output of the corresponding plurality of triggers;

[0117] A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of a waveform of the scan signal to be output to the scan signal line.

[0118] Specifically, the driving method further includes using a first circuit, where the first circuit has:

[0119] a capacitor connected to an input terminal of the drive circuit;

[0120] a voltage source connected to an input terminal of the driving circuit through the first switch;

[0121] a resistor connected in parallel to the capacitor through the second switch;

[0122] wherein the drive circuit outputs a voltage having a waveform from the capacitor of the circuit.

[0123] Through the above step flow, the rising slope of the scan signal respectively output to the scan signal line can be controlled, so that the voltage level of the waveform of the scan signal rises by the slope of the first predetermined value, so that the waveform of the scan signal a portion having a slope of a first predetermined value in a range between a high voltage level and a low voltage level of the rising ,, so that a waveform near the input terminal of the scanning signal line and near the terminal is not subjected to the scanning signal line The influence of the signal delay propagation characteristics of the parasitic ground is substantially the same, and the generation rate of the voltage level shift is lowered, and display of display defects such as no-image residual image is realized. Device.

13 is a flow chart showing the steps of a driving method of a display device according to another embodiment of the present application. The application method for driving a display device further includes the following steps S21 to S22 _:

[0125] Step S21: providing a data signal to the plurality of pixels through a data signal line;

[0126] Step S22: outputting a scan signal to the scan signal line disposed to intersect the data signal line to activate the scan signal line by using a driving circuit, wherein the scan signal includes a voltage having a waveform of a voltage level change period And wherein the voltage level rises in a slope manner of a first predetermined value and decreases in a slope manner of a second predetermined value, such that a waveform of the scan signal is in a range between a high voltage level and a low voltage level of the rising threshold a portion having a slope of the first predetermined value and a waveform of the scan signal having a slope of the second predetermined value in a range between a high voltage level and a low voltage level of the falling threshold And wherein the first predetermined value and the second predetermined value may be opposite to each other.

[0127] Specifically, the driving circuit includes:

[0128] having a cascaded shift register composed of a plurality of flip-flops;

[0129] a plurality of selections are respectively connected to the plurality of triggers, respectively, and respectively turned on or off according to the output of the corresponding plurality of triggers;

[0130] A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of rising and falling waveforms of the scan signals to be output to the scan signal lines.

[0131] In one embodiment, the driving method further includes using a first circuit, the circuit having:

[0132] a capacitor connected to an input terminal of the drive circuit;

[0133] a voltage source connected to an input terminal of the driving circuit through the first switch;

[0134] a resistor connected in parallel to the capacitor through the second switch;

[0135] wherein the drive circuit outputs a voltage having a waveform from the capacitor of the circuit.

[0136] Specifically, the driving method further includes: the driving method uses a circuit, and the circuit has:

[0137] an operational amplifier that receives a voltage source with a non-inverting input terminal;

[0138] a first resistor connected as an input resistor to the non-inverting input terminal of the operational amplifier;

[0139] as a feedback resistor connected to the second between the inverting input terminal and the output terminal of the operational amplifier Resistor;

[0140] wherein the drive circuit outputs a voltage having a waveform from the operational amplifier of the circuit.

[0141] Through the above step flow, the falling slope of the scan signal respectively output to the scan signal line can be controlled such that the voltage level of the waveform of the scan signal rises by a slope of the first predetermined value and is at a second predetermined value. The slope of the falling mode is such that the waveform of the scan signal has a portion that varies with a slope of the first predetermined value and a waveform of the scan signal with a high voltage of a falling voltage within a range between a high voltage level and a low voltage level of the rising chirp a portion between the level of the low and low voltage levels having a slope of the second predetermined value, wherein the first predetermined value and the second predetermined value are opposite to each other, thereby causing the vicinity of the input terminal of the scanning signal line and the terminal The nearby waveform is not affected by the signal delay propagation characteristics of the scanning signal line parasitically, and is substantially the same, and the rate of occurrence of the voltage level shift is lowered, thereby realizing a display device having no display defect such as a residual image.

14 is a flow chart showing the steps of a driving method of a display device according to still another embodiment of the present application. The present application provides a driving method for a display device, which further includes the following steps S31~S32:

[0143] Step S31: providing a data signal to the plurality of pixels through a data signal line;

[0144] Step S32: outputting, by the driving circuit, a scan signal to the scan signal line disposed to intersect the data signal line to actuate the scan signal line, wherein the scan signal includes a waveform having a voltage level change period a voltage, wherein the voltage level is decreased by a slope of a second predetermined value such that a waveform of the scan signal has a second predetermined value within a range between a high voltage level and a low voltage level of the falling chirp The part of the slope changes.

[0145] Specifically, the driving circuit includes:

[0146] having a cascaded shift register composed of a plurality of flip-flops;

[0147] a plurality of selections are respectively connected to the plurality of triggers, and respectively turned on or off according to the output of the corresponding plurality of triggers;

[0148] A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of a waveform of the scan signal to be output to the scan signal line.

[0149] Specifically, the driving method further includes using a first circuit, where the first circuit has:

[0150] a capacitor connected to an input terminal of the drive circuit;

[0151] a voltage source connected to an input terminal of the driving circuit through the first switch; [0152] connected to the resistor of the capacitor in parallel by the second switch;

[0153] wherein the drive circuit outputs a voltage having a waveform from the capacitor of the circuit.

[0154] Through the above step flow, the falling slope of the scan signal respectively output to the scan signal line can be controlled, so that the voltage level of the waveform of the scan signal is decreased by the slope of the second predetermined value, so that the waveform of the scan signal a portion having a slope of a second predetermined value in a range between a high voltage level and a low voltage level of the falling ,, so that a waveform near the input terminal of the scanning signal line and near the terminal is not subjected to the scanning signal line The parasitic ground has a influence on the propagation characteristics of the signal, and is substantially the same, and reduces the rate of occurrence of the voltage level shift, thereby realizing a display device having no display defect such as a residual image.

[0155] It should be noted that, in the embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in an embodiment may refer to related descriptions of other embodiments.

The above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of various kinds within the technical scope disclosed in the present application. Equivalent modifications or substitutions are intended to be included within the scope of the present application. Therefore, the scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

Claim

A display device, comprising:

Multiple pixels;

Providing a data signal line of the data signal to the plurality of pixels;

a scan signal line disposed to intersect the data signal line;

a driving circuit that outputs a scanning signal to the scanning signal line to actuate the scanning signal line; wherein a voltage level of a waveform of the scanning signal rises in a slope of a first predetermined value, so that a waveform of the scanning signal rises There is a portion in the range between the high voltage level and the low voltage level that varies with the slope of the first predetermined value.

The display device according to claim 1, wherein said driving circuit comprises: a cascaded shift register having a plurality of flip-flops;

a plurality of selections are respectively connected to the plurality of triggers and respectively turned on or off according to the outputs of the corresponding plurality of triggers;

A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control a slew rate of a waveform of a scan signal to be outputted to the scan signal line.

A display device according to claim 1, wherein said voltage has a period of one scanning period and has a waveform including a period of said voltage level change. The display device according to claim 1, wherein said driving circuit outputs a full-period waveform to said scanning signal line during a scanning period, and outputs a voltage level during a period other than said scanning period Not more than the end voltage level of the voltage level change.

The display device according to claim 1, wherein the number of the data signal lines is the same as the number of the scanning signal lines.

The display device as claimed in claim 1, wherein the display device further comprises: a first circuit, the first circuit having:

a capacitor connected to an input terminal of the drive circuit;

a voltage source connected to an input terminal of the driving circuit through a first switch; and a resistor connected in parallel to the capacitor through a second switch; Wherein the driving circuit outputs a voltage having a waveform from a capacitor of the first circuit.

[Claim 7] The display device according to claim 1, wherein the display device further comprises: a second circuit, the second circuit having:

An operational amplifier that receives a voltage source with a non-inverting input terminal;

a first resistor, one end of the first resistor is connected to a non-inverting input terminal of the operational amplifier; and the other end of the first resistor is connected to the voltage source;

a second resistor, the second resistor is connected to the non-inverting input terminal of the operational amplifier, and the other end of the second resistor is grounded;

a third resistor connected to the inverting input terminal of the operational amplifier; and a fourth resistor input resistor connected as a feedback resistor between the inverting input terminal and the output terminal of the operational amplifier;

Wherein the drive circuit outputs a voltage having a waveform from the operational amplifier of the circuit.

[Claim 8] The display device according to claim 7, wherein the second circuit satisfies R1 = R4

, R2 = R3, A = R4 / R3, where R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, R4 is The resistance value of the fourth resistor, A is the amplification factor of the operational amplifier.

[Claim 9] The display device according to claim 7, wherein the second circuit further has: a constant current source, an input resistor, and an input capacitor, wherein the constant current source passes through the input resistor One end of the input capacitor is connected, and the other end of the input capacitor is grounded, the constant current source is connected in series with the input resistor, and the series circuit of the constant current source and the input resistor In parallel with the input capacitor, the third resistor is connected to the input resistor and a connection node of the input capacitor

[Claim 10] The display device according to claim 9, wherein the first resistor, the second resistor, and the third resistor have a resistance greater than the input resistor.

[Claim 11] The display device according to claim 9, wherein the second circuit further has: a switch, the switch is connected in parallel with the input capacitor, and the switch and the constant Electricity A series connection of the current source and the input resistor is connected in parallel.

The display device according to claim 9, wherein said operational amplifier and said first resistor, said second resistor, said third resistor, and said fourth resistor constitute a subtraction portion The differential amplifier circuit performs the following subtraction in the subtraction section: VD1 b=Vddx[R2/ (R1+R2) ]x[l+ (R4/R3) ]

- (R4/R3) xVct, where VDlb is the output voltage of the operational amplifier, Vdd is the voltage source, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor, R3 is a resistance value of the third resistor, R4 is a resistance value of the fourth resistor, and Vet is a voltage of the input capacitor.

A display device according to claim 9, wherein said second circuit satisfies VDlb = VDD - AxVct, wherein VDlb is an output voltage of said operational amplifier, Vdd is said voltage source, and A is said operational amplifier Magnification, Vet is the voltage of the input capacitor.

A display device according to claim 9, wherein said second circuit satisfies Vslope = Vcthx (R4/R3), wherein Vslope is a slope amount, Vcth is a maximum amplitude of a voltage of said input capacitor, and R3 is The resistance value of the third resistor, and R4 is the resistance value of the fourth resistor.

A driving method of a display device, comprising:

Providing a data signal to a plurality of pixels through a data signal line;

Outputting a scan signal to a scan signal line disposed to intersect the data signal line by a driving circuit to actuate the scan signal line;

The voltage level of the waveform of the scan signal is increased by a slope of a first predetermined value, so that the waveform of the scan signal is within a range between a high voltage level and a low voltage level of the rising threshold. The portion of the slope of the first predetermined value that varies.

The driving method of a display device according to claim 15, wherein the driving circuit comprises:

a cascaded shift register having a plurality of flip flops;

a plurality of selections are respectively connected to the plurality of triggers, and respectively according to the corresponding plurality of touches The output of the transmitter is turned on or off;

[Claim 17] The driving method of the display device according to claim 15, wherein the driving method further comprises: using a first circuit, the first circuit having:

a capacitor connected to an input terminal of the drive circuit;

a voltage source connected to an input terminal of the driving circuit through a first switch; and a resistor connected in parallel to the capacitor through a second switch; wherein the driving circuit outputs a waveform having a waveform from a capacitor of the first circuit .

[Claim 18] A display device, comprising:

Multiple pixels;

Providing a data signal line of the data signal to the plurality of pixels;

a scan signal line disposed to intersect the data signal line; and a drive circuit that outputs a scan signal to the scan signal line to actuate the scan signal line; wherein a voltage level of a waveform of the scan signal is at a first predetermined value The slope mode is increased and decreased by the slope of the second predetermined value, so that the waveform of the scan signal has a portion that changes with a slope of the first predetermined value and scans within a range between the high voltage level and the low voltage level of the rising 吋The waveform of the signal has a portion that varies with a slope of the second predetermined value within a range between the high voltage level and the low voltage level of the falling chirp;

The first predetermined value and the second predetermined value are opposite to each other; wherein the driving circuit comprises:

a cascaded shift register having a plurality of flip flops;

A plurality of control devices are respectively connected to the input terminals of the plurality of selection switches, and control the slew rate of the rising and falling waveforms of the scanning signals to be output to the scanning signal lines.