TWI416482B - Display apparatus, display module and driving method of the display module - Google Patents

Abstract

A display module includes a plurality of scan line driving circuits, a signal control circuit, a potential control circuit, and an oblique-angle generating circuit. The signal control circuit is electrically connected to the scan line driving circuits and outputs a turn-off signal as the display module is turned off. The potential control circuit is electrically connected to the signal control circuit and outputs a control signal in accordance with the turn-off signal. The oblique-angle generating circuit is electrically connected to the scan line driving circuits and the potential control circuit for receiving the control signal, and continuously outputs a voltage signal with an oblique angle to the scan line driving circuits in accordance with the control signal.

Description

Display device, display module and driving method of display module

The invention relates to a display device, a display module and a driving method of the display module.

With the advancement of technology, display devices have been widely used in various fields, especially liquid crystal display devices, which have gradually replaced traditional cathode ray tube display devices due to their superior characteristics such as slimness, low power consumption and no radiation. Applied to many types of electronic products, such as notebook computers, LCD TVs and LCD screens.

In the liquid crystal display device, the liquid crystal display device controls the amount of light penetration by utilizing the characteristics that the liquid crystal molecules rotate in response to changes in the electric field, thereby causing the liquid crystal display device to generate a rich image. However, when the liquid crystal display device is turned off, the discharge time of the charge stored on the panel is often different, and the image of the shutdown is often generated.

Please refer to FIG. 1 , which is a schematic circuit diagram of a conventional display module 1 . The display module 1 includes a signal control circuit 11, an angle generating circuit 13, and a plurality of scanning line driving circuits 10. The scan angle generating circuit 13 is electrically connected to the scan line driving circuit 10, and the signal control circuit 11 is electrically connected to the scan line driving circuit 10. The scan line driving circuit 10 is electrically connected to the plurality of scanning lines 14. The display module 1 further includes a power supply unit 15 that outputs a power signal S _S to the signal control circuit 11 . If the display module 1 is switched to a shutdown state, the power signal S _S is a low potential signal, and one of the output signals S _XAO outputted from the signal control circuit 11 is also a low potential signal, and is input to each of the scan line driving circuits. 10 one of the control circuits (not shown).

A fixed voltage source V _GHS inputs an input voltage signal S _VGHS to the chamfering generating circuit 13 to output an output voltage signal, that is, a cut-off voltage signal S _VGH to the scan line driving circuit 10, and then turn on. The thin film transistor (TFT, not shown) of the pixel completely releases the residual charge stored on the liquid crystal display capacitor, thereby achieving the purpose of clearing the residual image. However, in the off state, since the first timing control signal GV _OFF and the second timing control signal GV _ON output from the timing control unit (not shown) to the chamfer generation circuit 13 cannot be controlled, the chamfer angle may be generated. Circuit 13 cannot output a chamfer voltage signal S _VGH . This uncertainty factor will affect the discharge condition of the shutdown signal S _XAO after startup, and the situation of shutting down the residual image is good or bad.

Therefore, how to provide a display device, a display module, and a driving method of the display module, so as to ensure that the forced corner generating circuit outputs a continuous voltage signal to the scan line driving circuit when the power is turned off, so that the timing control signal is not turned off when the power is turned off. The influence has been one of the important topics to effectively improve the phenomenon of shutdown afterimage and improve display quality.

In view of the above problems, the object of the present invention is to provide a strong manufacturing circuit, which can forcibly generate a continuous voltage signal to the scan line driving circuit when the power is off, so that it is not affected by the timing control signal during shutdown, so as to be effective. A display device, a display module, and a display module driving method for improving the shutdown phenomenon and improving the display quality.

To achieve the above objective, a display module according to the present invention has a plurality of scanning line driving circuits, a signal control circuit, a strong manufacturing circuit, and all angle generating circuits. The signal control circuit is electrically connected to the scan line driving circuit, and outputs a shutdown signal when the display module is switched to the shutdown mode. The strong production circuit is electrically connected to the signal control circuit, and outputs a compulsory signal according to the shutdown signal. The chamfer generating circuit is electrically connected to the scan line driving circuit and the strong manufacturing circuit to receive the compulsory signal, and outputs all angular voltage signals to the scan line driving circuits according to the compulsory signal.

In order to achieve the above object, a display module driving method according to the present invention, wherein the display module has a plurality of scanning line driving circuits, a signal control circuit, a strong manufacturing circuit, and all angle generating circuits. The chamfer generating circuit is electrically connected to the strong driving circuit and the scanning line driving circuit. The driving method comprises the following steps: when the display module is switched to the shutdown mode, the signal control circuit outputs a shutdown signal; the signal control circuit outputs a shutdown signal to the strong production circuit and the scan line drive circuit; and the strong production circuit is based on the shutdown signal Outputting a compulsory signal to the chamfer generating circuit; and receiving the compulsory signal by the chamfer generating circuit, and outputting all angular voltage signals to the scan line driving circuit according to the compulsory signal.

To achieve the above objective, a display device according to the present invention includes a display module and a backlight module opposite to the display module. The display module comprises a plurality of scanning line driving circuits, a signal control circuit, a strong manufacturing circuit and all corner generating circuits. The signal control circuit is electrically connected to the scan line driving circuit, and outputs a shutdown signal when the display module is switched to the shutdown mode. The strong production circuit is electrically connected to the signal control circuit, and outputs a compulsory signal according to the shutdown signal. The chamfer generating circuit is electrically connected to the scan line driving circuit and the strong manufacturing circuit to receive the compulsory signal, and the chopping angle generating circuit continuously outputs all the corner voltage signals to the scan line driving circuits according to the forced signal.

According to the above description, a display device, a display module, and a display module driving method according to the present invention use a strong manufacturing circuit to output a forced signal to a chamfering generating circuit when the display module is in a shutdown mode, thereby ensuring It is not affected by the timing control signal during shutdown, so as to effectively improve the phenomenon of shutdown afterimage, thereby improving display quality.

Hereinafter, a display device, a display module, and a driving method of a display module according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

Please refer to FIG. 2 , which is a circuit diagram of a display module 2 according to a preferred embodiment of the present invention. Referring to FIG. 2, the display module 2 includes a plurality of scanning line driving circuits 20, a signal control circuit 21, a strong manufacturing circuit 22, and an angle generating circuit 23. The signal control (XAO) circuit 21 is electrically connected to the scan line driving circuit 20, and outputs a shutdown signal S _XAO when the display module 2 is switched to the shutdown mode. The strong manufacturing circuit 22 is electrically connected to the signal control circuit 21, and outputs a forced signal S _OUT according to the shutdown signal S _XAO . The chamfering generating circuit 23 is electrically connected to the scanning line driving circuit 20 and the strong driving circuit 22 to receive the compulsory signal S _OUT , and outputs all the angular voltage signals S _VGH to the scanning line driving circuit 20 according to the compulsory signal S _{OUT .} .

The display module 2 further includes a power supply unit 25 and a plurality of scan lines 24. The power supply unit 25 is electrically connected to the signal control circuit 21 and the strong manufacturing circuit 22 . The plurality of scanning lines 24 are electrically connected to the scanning line driving circuits 20 to receive the shutdown signal S _XAO , and each of the scanning line driving circuits 20 includes a control unit (not shown) electrically connected to the signal control circuit 21 . .

In this embodiment, the shutdown signal S _XAO and the forced signal S _OUT are both low potential signals.

Next, please refer to FIG. 3, which is a schematic diagram of a strong manufacturing circuit 22 according to a preferred embodiment of the present invention. The strong circuit 22 includes a charge storage element C, a first switching element NMOS1, and a second switching element NMOS2. The first switching element NMOS1 has a first end n11, a second end n12 and a third end n13. The first end n11 of the first switching element NMOS1 is electrically connected to the signal control circuit 21, and the first switching element NMOS1 is The two terminals n12 are electrically connected to the charge storage element C. The second switching element NMOS2 has a first end n21, a second end n22 and a third end n23. The first end n21 of the second switching element NMOS2 and the second end n12 of the first switching element NMOS1 and the charge storage element C are electrically The second end n22 of the second switching element NMOS2 is electrically connected to the chamfering generating circuit 23.

In the embodiment, the charge storage element C is a capacitor, and the first switching element NMOS1 and the second switching element NMOS2 are both a transistor.

Referring to FIG. 3, the strong circuit 22 further includes a first resistor R1, a second resistor R2, and a third resistor R3. The first resistor R1 is electrically connected to the charge storage element C. The second resistor R2 is electrically connected to the third terminal n13 of the first switching element NMOS1 and a first ground GND1. The third resistor R3 is electrically connected to the third terminal n23 of the second switching element NMOS2 and a second ground GND2.

Referring to FIG. 5 and FIG. 3 together, FIG. 5 is a flow chart of a driving method of the display module 2 according to a preferred embodiment of the present invention. The display module 2 has a plurality of scanning line driving circuits 20, a signal control circuit 21, a strong manufacturing circuit 22, and an angle generating circuit 23. The signal control circuit 21 is electrically connected to the strong driving circuit 22 and the scanning line driving circuit 20, and the chamfering generating circuit 23 is electrically connected to the strong driving circuit 22 and the scanning line driving circuit 20. The driving module 2 further includes a power supply unit 25, which inputs a power signal S _S to determine whether the display module 2 is in a shutdown mode. For example, when the power signal S _S is a low potential signal, the display module 2 is switched to Shutdown mode. The driving method steps S01 to S04 are as follows.

In step S01, when the display module 2 is switched to the shutdown mode, the signal control circuit 21 outputs a shutdown signal S _XAO .

In step S02, the signal control circuit 21 outputs the shutdown signal S _{XAO to the} strong production circuit 22 and the scan line drive circuits 20. The shutdown signal S _XAO is a low potential signal, and the shutdown signal S _XAO is received by a control circuit (not shown) of each of the scan line drive circuits 20.

In step S03, the forced-making circuit 22 outputs a forced signal S _OUT to the chamfering generating circuit 23 according to the shutdown signal S _XAO . The first end n11 of the first switching element NMOS1 of the shutdown signal S _XAO self-energizing circuit 22 enters the first switching element NMOS1, and the first switching element NMOS1 can be turned off because the shutdown signal S _XAO is a low potential signal here. shut down. At the same time, the low-potential power signal S _{S is} output from the power supply unit 25, sequentially passes through the first resistor R1 and the charge storage element C of the strong-working circuit 22, and since the first switching element NMOS1 is in a closed state, the first switching element NMOS1 The second terminal n12 outputs a high-potential power signal (not shown) to turn on the second switching element NMOS2, and the high-potential power signal is divided by the second resistor R2, and is output from the second terminal n22 of the second switching element NMOS2. A low potential voltage signal close to ground, that is, a forced signal S _OUT , to the chamfer generating circuit 23.

Referring to FIG. 5, in step S04, the cut angle generating circuit 23 receives the forced signal S _OUT , and causes the chamfer generating circuit to continuously output the corner voltage signal S _VGH to the scan line driving circuit 20 according to the forced signal S _{OUT .} . Referring to FIG. 4 at the same time, it is a schematic diagram of a chamfer generating circuit 23 according to a preferred embodiment of the present invention.

As shown in FIG. 4, the chamfering generating circuit 23 mainly has a third switching element NMOS3, a fourth switching element NMOS4, and a fifth switching element PMOS, and has a first timing control signal input through the third switching element NMOS3. GV _OFF and a second timing control signal GV _ON input via the fourth switching element NMOS4. The chamfering generating circuit 23 is electrically connected to the strong driving circuit 22 at point A, and receives the low potential forcing signal S _OUT from the strong manufacturing circuit 22, which is input from the first end p1 of the fifth switching element PMOS to turn on the fifth Switching element PMOS. The chamfering generating circuit 23 further has an input voltage signal S _VGHS input by a fixed voltage source V _{GHS , which is} input from the second end p2 of the fifth switching element PMOS in a state where the fifth switching element PMOS is turned on, and An output voltage signal, that is, a cut-off voltage signal S _VGH , is output from the third terminal p3 of the fifth switching element, and is forcibly bypassed to the scan line driving circuit 20 without receiving the first timing control signal GV. _{The effect of OFF} and the second timing control signal GV _ON , which in turn turns on the thin film transistor (TFT) of the pixel to remove image retention.

In this embodiment, the charge storage element C is a capacitor, and the first switching element NMOS1 and the second switching element NMOS2 are both a transistor.

However, if the power signal S _S is a high-potential signal, please continue to refer to FIG. 2 to FIG. 4 , the display module 2 is switched to the power-on mode, and the signal control circuit 21 outputs a power-on signal (not shown). The power-on signal is output from the signal control circuit 21 to the strong-working circuit 22 and the scan line drive circuit 20, and is received by a control circuit (not shown) of each of the scan line drive circuits 20. Then, the first terminal n11 of the first switching element NMOS1 of the booting signal self-energizing circuit 22 enters and passes through the first switching element NMOS1, and the first switching element NMOS1 can be turned on because the power-on signal is a high-potential signal here. The boot signal sequentially passes through the first resistor R1, the charge storage element C and the second resistor R2 of the strong driving circuit 22, and uses the first resistor R1 and the second resistor R2 to perform appropriate resistor division, so that the first switching element NMOS1 The second terminal n12 outputs a low potential power signal (not shown) to turn off the second switching element NMOS2. Therefore, the signal outputted from the second terminal n22 of the second switching element NMOS2 is a floating signal, which will not Affects the normal operation of the chamfer generating circuit 23.

Referring to FIG. 6 , a display device 6 according to a preferred embodiment of the present invention includes a display module 60 and a backlight module 61 . The display module 60 is disposed opposite to the backlight module 61. The display module 60 includes a plurality of pixel circuits 601, a plurality of scanning lines 624, a plurality of data lines 602, a plurality of scanning line driving circuits 620, a plurality of data line driving circuits 603, a signal control circuit 621, a strong manufacturing circuit 622, and all corners. A circuit 623 and a timing control unit 604 are generated. Each of the pixel circuits 601 includes a switching element Q (not shown) and a pixel electrode P (not shown). The driving method of the display module 60 of the display device 6 is the same as the driving method of the display module of the above embodiment, and thus will not be described herein.

In summary, the display device, the display module, and the display module driving method according to the present invention output a shutdown signal to the strong production circuit by adding a signal control circuit and switching the display module to the shutdown mode. A plurality of scanning line drive circuits. The strong production circuit is electrically connected to the signal control circuit, and outputs a forced signal to the chamfer generation circuit according to the shutdown signal. The chamfer generating circuit is electrically connected to the plurality of scanning line driving circuits and the strong manufacturing circuit to receive the compulsory signal, and outputs the chamfer voltage signal to the plurality of scanning line driving circuits according to the compulsory signal. Compared with the prior art, the strong manufacturing circuit of the present invention can force the chamfering generating circuit to output a continuous voltage signal to the scanning line driving circuit when the power is off, so that it is not affected by the timing control signal when the power is turned off, so as to effectively improve the shutdown. Shadow phenomenon, which in turn improves display quality.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 2, 60. . . Display module

10, 20, 620. . . Scan line driver circuit

11, 21, 621. . . Signal control circuit

13, 23, 623. . . Chamfer generating circuit

14, 24, 624. . . Scanning line

15,25. . . Power supply unit

22,622. . . Strong production circuit

6. . . Display device

61. . . Backlight module

601. . . Pixel circuit

602. . . Data line

603. . . Data line driver circuit

604. . . Timing control unit

C. . . Charge storage element

GND1. . . First ground

GND2. . . Second ground

GV _OFF . . . First timing control signal

GV _ON . . . Second timing control signal

NMOS1. . . First switching element

N11. . . First end of the first switching element

N12. . . Second end of the first switching element

N13. . . Third end of the first switching element

NMOS2. . . Second switching element

N21. . . First end of the second switching element

N22. . . Second end of the second switching element

N23. . . Third end of the second switching element

NMOS3. . . Third switching element

NMOS4‧‧‧fourth switching element

PMOS‧‧‧ fifth switching element

First end of p1‧‧‧ fifth switching element

The second end of the p2‧‧‧ fifth switching element

Third end of p3‧‧‧ fifth switching element

R1‧‧‧first resistance

R2‧‧‧second resistance

R3‧‧‧ third resistor

S01~S04‧‧‧Steps

S _S ‧‧‧Power signal

S _XAO ‧‧‧Shutdown signal

S _OUT ‧‧‧compulsory signal

S _{VGHS ‧‧‧Input} voltage signal

S _VGH ‧‧‧Chamfer Voltage Signal

V _GHS ‧‧‧Fixed voltage source

1 is a circuit diagram of a conventional display module;

2 is a circuit diagram of a display module according to a preferred embodiment of the present invention;

3 is a schematic diagram of a strong manufacturing circuit according to a preferred embodiment of the present invention;

4 is a schematic diagram of a corner generating circuit according to a preferred embodiment of the present invention;

5 is a flow chart of a driving method of a display module according to a preferred embodiment of the present invention;

FIG. 6 is a schematic circuit diagram of a display device according to a preferred embodiment of the present invention.

2. . . Display module

20. . . Scan line driver circuit

twenty one. . . Signal control circuit

twenty two. . . Strong production circuit

twenty three. . . Chamfer generating circuit

twenty four. . . Scanning line

25. . . Power supply unit

GV _OFF . . . First timing control signal

GV _ON . . . Second timing control signal

S _S . . . Power signal

S _XAO . . . Shutdown signal

S _OUT . . . Forced signal

S _VGHS . . . Input voltage signal

S _VGH . . . Cut angle voltage signal

Claims (22)

A display module includes: a plurality of scan line driving circuits; a signal control circuit electrically connected to the scan line driving circuits, and outputs a shutdown signal when the display module is switched to the shutdown mode; Electrically connecting with the signal control circuit, and outputting a compulsory signal according to the shutdown signal; and all corner generating circuits electrically connected to the scan line driving circuit and the strong driving circuit to receive the compulsory signal, and Outputting all angular voltage signals to the scan line driving circuit according to the forced signal; wherein the strong circuit includes: a charge storage element; and a first switching element having a first end, a second end, and a third end, The first end is electrically connected to the signal control circuit, the second end is electrically connected to the charge storage element, and the second switch element has a first end, a second end and a third end, the first end One end is electrically connected to the second end of the first switching element and the charge storage element, and the second end is electrically connected to the chamfer generating circuit. The display module of claim 1, wherein each of the scan line driving circuits comprises a control unit electrically connected to the signal control circuit. The display module of claim 1, wherein the shutdown signal is a low potential signal. The display module of claim 1, wherein the compulsory signal is a low potential signal. The display module of claim 1, further comprising: a plurality of scan lines electrically connected to each of the scan line drive circuits to receive the chamfer voltage signal. The display module of claim 1, further comprising: a power supply unit electrically connected to the signal control circuit and the strong manufacturing circuit. The display module of claim 1, wherein the charge storage element is a capacitor. The display module of claim 1, wherein the first switching element and the second switching element are each a transistor. The display module of claim 1, wherein the strong manufacturing circuit further comprises: a first resistor electrically connected to the charge storage element; a second resistor, and the first switch element The third end and the first ground end are electrically connected; and a third resistor is electrically connected to the third end and the second ground end of the second switching element. A driving method of a display module, wherein the display module has a plurality of scanning line driving circuits, a signal control circuit, a strong manufacturing circuit, and all corner generating circuits, wherein the signal control circuit and the forcing The driving circuit and the scan line driving circuit are electrically connected, and the chamfer generating circuit is electrically connected to the strong driving circuit and the scan line driving circuit, and the driving method comprises the steps of: switching the display module to the shutdown mode The signal control circuit outputs a shutdown signal; the signal control circuit outputs the shutdown signal to the strong production circuit and the scan line drive circuit; and the strong production circuit outputs a compulsory signal to the chamfer according to the shutdown signal Generating a circuit; and receiving, by the chamfer generating circuit, the compulsory signal, and outputting all angular voltage signals to the scan line driving circuit according to the compulsory signal; wherein the strong driving circuit comprises: a charge storage element; and a first switching element a first end, a second end, and a third end, the first end is electrically connected to the signal control circuit, the second end is electrically connected to the charge storage element, and a second switch element has a first end, a second end, and a third end, the first end electrically connected to the second end of the first switching element and the charge storage element , The second end of the generating circuit is electrically connected to the chamfer. The driving method of claim 10, wherein the shutdown signal is a low potential signal. The driving method of claim 10, wherein the compulsory signal is a low potential signal. The driving method of claim 10, wherein the display module further comprises a power supply unit that outputs a power signal to determine whether the display module is in a shutdown mode. A display device comprising: a display module comprising: a plurality of scan line drive circuits; a signal control circuit electrically connected to the scan line drive circuits, and outputting a shutdown when the display module is switched to the shutdown mode a strong driving circuit, electrically connected to the signal control circuit, and outputting a compulsory signal according to the shutdown signal; and all corner generating circuits electrically connected to the scanning line driving circuit and the strong manufacturing circuit to Receiving the forced signal, and outputting all corner voltage signals to the scan line driving circuit according to the forced signal; wherein the strong driving circuit comprises: a charge storage element; and a first switching element having a first end and a second end And a third end, the first end is electrically connected to the signal control circuit, the second end is electrically connected to the charge storage element, and a second switch element has a first end, a second end, and a a third end, the first end is electrically connected to the second end of the first switching element and the charge storage element, and the second end is electrically connected to the chamfer generating circuit as well as A backlight module is disposed opposite the display module. The display device of claim 14, wherein each of the scan line driving circuits comprises a control unit electrically connected to the signal control circuit. The display device of claim 14, wherein the shutdown signal is a low potential signal. The display device of claim 14, wherein the compulsory signal is a low potential signal. The display device of claim 14, wherein the display module further comprises: a plurality of scan lines electrically connected to the scan line drive circuits to receive the chamfer voltage signals. The display device of claim 14, wherein the display module further comprises: a power supply unit electrically connected to the signal control circuit and the strong manufacturing circuit. The display device of claim 14, wherein the charge storage element is a capacitor. The display device of claim 14, wherein the first switching element and the second switching element are each a transistor. The display device of claim 14, wherein the strong manufacturing circuit further comprises: a first resistor electrically connected to the charge storage element; a second resistor, and the third resistor of the first switching element End and first The grounding end is electrically connected; and a third resistor is electrically connected to the third end and the second ground end of the second switching element.