TWI409772B - Pixel structure, display panel and driving methods thereof - Google Patents

Abstract

A driving method of a pixel structure includes the steps of transmitting a driving signal with a first level to turn on a first-type transistor and turn off a second-type transistor through a scan line, and writing a first image data into a pixel equivalent capacitance through a data line and the first-type transistor in a first time period; transmitting a driving signal with a second level to turn off the first-type transistor and the second-type transistor through the scan line in a second time period; and transmitting a driving signal with a third level to turn on the second-type transistor and turn off the first-type transistor through the scan line, and writing a second image data into the pixel equivalent capacitance through a signal line and the second-type transistor in a third time period.

Description

Pixel architecture, display panel and driving method thereof

The present invention relates to a pixel architecture, a display panel, and a driving method thereof.

Display devices are one of the indispensable electronic products in today's life. They have evolved from early cathode ray tube (CRT) display devices to today's liquid crystal display (LCD) devices and organic light-emitting diodes. Organic light-emitting diode (OLED) display devices, etc., are widely used in communications, information and consumer electronics.

In the liquid crystal display device, the liquid crystal display device is switched depending on the reaction speed of the liquid crystal molecules, the driving method of the liquid crystal display device, the display light source generated by the backlight module, and the eye-tracking characteristic. A problem of motion blur occurs when the screen is displayed.

Dynamic blur refers to the phenomenon that the edge contour is blurred during the process of switching the display screen. In order to improve the problem of dynamic blurring, conventional liquid crystal display devices use a high-speed liquid crystal material, or an overdrive driving method, or a black frame insertion technique to improve the problem of dynamic blurring. .

Referring to FIG. 1 , a pixel structure 1 using a black screen technology includes a first transistor T ₁₁ , a second transistor T _{12 ,} and a pixel equivalent capacitor C ₁₁ .

The first transistor T ₁₁ is electrically connected to a first scan line S ₁₁ , a data line D _{11 ,} and a second transistor T ₁₂ , and the second transistor T ₁₂ is coupled to a second scan line S ₁₂ and a signal. A line (not shown) is electrically connected, and the pixel equivalent capacitance C ₁₁ is electrically connected to the first transistor T ₁₁ and the second transistor T ₁₂ . Here, the first transistor T ₁₁ and the second transistor T ₁₂ are all n-type metal-oxide-semiconductor (NMOS) transistors. In addition, the pixel equivalent capacitor C ₁₁ has a liquid crystal capacitor C _LC1 and a storage capacitor C _ST1 electrically connected to each other.

Please refer to FIG. 2 to illustrate the operation of the pixel structure 1 described above. At a first time t _11, the scan line S ₁₁ transmits the high level of the drive signal turns on the first transistor T _11, and the scan line S ₁₂ transmits a low level OFF signal of the second driving transistor T _12. In this case, an image data line ₁₁ via data line D, a first transistor T ₁₁ writes the pixel equivalent capacitance C _{11, 11} at both ends of the pixel equivalent capacitance C has a potential difference V _LC1.

During a second time t ₁₂ , the scan line S ₁₁ and the scan line S ₁₂ are both driving signals of low level and turning off the first transistor T ₁₁ and the second transistor T _{12 , respectively} .

During a third time t ₁₃ , the scan line S ₁₁ transmits the low level drive signal to the first transistor T ₁₁ , and the scan line S ₁₂ transmits the high level drive signal to turn on the second transistor T ₁₂ . At this time, a black screen image data can be written into the pixel equivalent capacitance C ₁₁ via the signal line and the second transistor T ₁₂ . The signal line transmits a common voltage V _COM , which is input to the pixel equivalent capacitance C ₁₁ via the second transistor T ₁₂ to write the black image data to the pixel equivalent capacitance C ₁₁ .

During a fourth time t ₁₄ , the scan line S ₁₁ and the scan line S ₁₂ are both driving signals of low level and turning off the first transistor T ₁₁ and the second transistor T _{12 , respectively} .

However, the pixel structure 1 includes two scanning lines S ₁₁ and S ₁₂ and is made of an opaque material, which causes the aperture ratio of the pixel structure 1 to decrease, thereby causing a decrease in brightness of the display device. Therefore, how to provide a pixel structure, a display panel and a driving method thereof for reducing the number of scanning lines to increase the aperture ratio under the existing pixel structure is one of the current important topics.

In view of the above problems, an object of the present invention is to provide a pixel structure, a display panel, and a driving method thereof that can increase an aperture ratio.

To achieve the above object, the present invention provides a pixel architecture that is used in conjunction with a scan line and a data line. The pixel architecture includes a first type of transistor, a second type of transistor, and a pixel equivalent capacitance. The first type of transistor is electrically connected to the scan line and the data line, and the second type of transistor is electrically connected to the scan line, the signal line and the first type of transistor, the pixel equivalent capacitance and the first type of transistor and the first type Two types of transistors are electrically connected.

To achieve the above objective, the present invention provides a driving method for a pixel structure, wherein a pixel structure is used in combination with a scan line and a data line, and the pixel structure has a first type of transistor, a second type of transistor, and A pixel equivalent capacitor. The first type of transistor and scan line and data line The second type of transistor is electrically connected to the scan line, the signal line, and the first type of transistor. The pixel equivalent capacitance is electrically connected to the first type of transistor and the second type of transistor. The driving method of the pixel structure includes the following steps: transmitting a first level driving signal through a scan line to turn on a first type of transistor, cutting off a second type of transistor, and transmitting a data through a scan line The line and the first type of transistor write a first image data to a pixel equivalent capacitance. At a second time, a second level of driving signal is transmitted via the scan line to turn off the first type of transistor and the second type of transistor. At a third time, a third level of driving signal is transmitted through the scan line to turn on the second type of transistor, the first type of transistor is turned off, and a second image data is written by the signal line and the second type of transistor. Enter the pixel equivalent capacitance.

To achieve the above objective, the present invention provides a display panel including a first substrate and a second substrate. The second substrate is disposed opposite to the first substrate and has a pixel structure, a scan line and a data line, wherein the pixel structure has a first type of transistor, a second type of transistor and a pixel equivalent capacitance . The first type of transistor is electrically connected to the scan line and the data line, and the second type of transistor is electrically connected to the scan line, the signal line and the first type of transistor, the pixel equivalent capacitance and the first type of transistor and the first type Two types of transistors are electrically connected.

To achieve the above object, the present invention provides a driving method of a display panel. The display panel has a scan line, a data line and a pixel structure, and the pixel structure has a first type of transistor, a second type of transistor and a pixel equivalent capacitance. The first type of transistor and scan line and The data line is electrically connected. The second type of transistor is electrically connected to the scan line, the signal line, and the first type of transistor. The pixel equivalent capacitance is electrically connected to the first type of transistor and the second type of transistor. The driving method of the display panel includes the following steps: transmitting a first level driving signal through a scan line to turn on a first type of transistor, cutting off a second type of transistor, and passing through a data line. And the first type of transistor writes a first image data into a pixel equivalent capacitance. At a second time, a second level of driving signal is transmitted via the scan line to turn off the first type of transistor and the second type of transistor. At a third time, a third level of driving signal is transmitted through the scan line to turn on the second type of transistor, the first type of transistor is turned off, and a second image data is written by the signal line and the second type of transistor. Enter the pixel equivalent capacitance.

As described above, the pixel structure, the display panel, and the driving method thereof according to the present invention use the first type of transistor in the pixel structure and the second type of transistor to have different actuation states at different voltage levels. By appropriately controlling the state of its operation, it is possible to insert black image data using only one scan line to improve the problem of dynamic blur. Compared with the prior art, the pixel structure, the display panel and the driving method thereof of the invention can reduce the opaque area of the pixel structure, thereby increasing the aperture ratio.

Hereinafter, a pixel structure, a display panel, and a driving method thereof according to a preferred embodiment of the present invention will be described with reference to related drawings.

Referring to FIG. 3, the pixel structure 2 of the preferred embodiment of the present invention includes a first type of transistor T ₂₁ , a second type of transistor T _{22 ,} and a pixel equivalent capacitor C ₂₁ .

The first type of transistor T ₂₁ is electrically connected to a scan line S ₂₁ , a data line D ₂₁ and a second type transistor T ₂₂ , and the second type of transistor T ₂₂ is connected to the scan line S ₂₁ and a signal line ( The figure is not shown. The electrical connection, the pixel equivalent capacitance C ₂₁ is electrically connected to the first type of transistor T ₂₁ and the second type of transistor T ₂₂ . Wherein, the signal line transmits a common voltage V _COM .

In this embodiment, the first type of transistor T ₂₁ and the second type of transistor T ₂₂ are respectively N-type MOS transistors and p-type metal-oxide-semiconductors (PMOS). Transistor. However, it is known to those skilled in the art that the first type of transistor T ₂₁ and the second type of transistor T ₂₂ can also be P-type MOS transistors and N-type MOS transistors, respectively. .

In addition, the pixel equivalent capacitor C ₂₁ has a liquid crystal capacitor C _LC2 and a storage capacitor C _ST2 . The liquid crystal capacitor C _LC2 is electrically connected to the storage capacitor C _ST2 .

Please refer to FIG. 4 to illustrate the operation of the pixel structure 2 described above. During a first time t ₂₁ , the scan line S ₂₁ transmits a driving signal of a first level L _{1 to} turn on the first type of transistor T ₂₁ and turns off the second type of transistor T ₂₂ . At this time, a first image data ₂₁ may be based, a first type of transistor T ₂₁ writes the pixel equivalent capacitance C via the data line D _21, both ends of the pixel equivalent capacitance C has a potential difference of ₂₁ V _LC2. The first image data is the display data of the display screen, and the absolute value of the first level L ₁ is greater than the absolute value of the voltage level of the first image data to turn on the first type of transistor T ₂₁ .

During a second time t ₂₂ , the scan line S ₂₁ transmits a drive signal of the second level L _{2 to turn} off the first type of transistor T ₂₁ and the second type of transistor T ₂₂ .

During a third time t ₂₃ , the scan line S ₂₁ transmits a drive signal of a third level L _{3 to turn} off the first type of transistor T ₂₁ and turn on the second type of transistor T ₂₂ . At this time, the common voltage V _COM can be transmitted to the second type transistor T ₂₂ via the signal line, and a second image data is written into the pixel equivalent capacitance C ₂₁ , and the absolute value of the third level L ₃ is The absolute value of the voltage level is greater than the second image data to turn on the second type of transistor T ₂₂ . The second image data is a black image data.

As described above, in this embodiment, the first type of transistor T ₂₁ and the second type of transistor T ₂₂ in the pixel structure 2 have different operating states at different voltage levels, with appropriate control. In its active state, black line image data can be inserted using only one scanning line S ₂₁ to improve the problem of dynamic blur. Compared with the prior art, the pixel structure 2 of the embodiment can reduce the opaque area of the pixel structure 2, thereby increasing the aperture ratio.

During a fourth time t ₂₄ , the scan line S ₂₁ transmits the driving signal of the second level L _{2 to turn} off the first type transistor T ₂₁ and the second type transistor T ₂₂ . The second level L ₂ is between the first level L ₁ and the third level L ₃ .

In addition, the first time t ₂₁ , the second time t ₂₂ , the third time t _{23 ,} and the fourth time t ₂₄ of the embodiment may constitute a frame time t _F . In this embodiment, the pixel architecture 2 operates at a plurality of frame times t _F , wherein the display screen is in a frame time t _F , half of the time is displaying the first image data, and the other half is displaying the black image. Screen image data.

In addition, the above signal line can be another scan line, which can transmit the common voltage V _COM by appropriately controlling the signal transmitted by the scan line, so that the display screen can also display black image data. To improve the problem of dynamic blur.

Referring to FIG. 5, the topology of the pixel structure 2 of the present embodiment is applied in combination with the complex scan lines S ₂₁ to S _2n and the plurality of data lines D ₂₁ to D _2m . The scan lines S ₂₁ -S _2n and the data lines D ₂₁ -D _2m are staggered and form corresponding interlaced regions. A pixel structure 2 as shown in FIG. 3 can be disposed in each interlaced area.

Referring to FIG. 6 , a display panel 3 according to a preferred embodiment of the present invention includes a first substrate 31 , a liquid crystal layer 32 , and a second substrate 33 . The second substrate 33 is disposed opposite to the first substrate 31, and the liquid crystal layer 32 is disposed between the second substrate 33 and the first substrate 31.

In this embodiment, the second substrate 33 includes a pixel structure, a scan line, and a data line. The descriptions of the pixel structure, the scan line and the data line are as described above and shown in FIG. 3, and are not described herein again.

Please refer to FIG. 7, which is a driving method of a pixel structure according to a preferred embodiment of the present invention. The pixel architecture is used in conjunction with a scan line and a data line. The pixel structure, the scan line, and the data line are the same as the pixel structure 2 of the above embodiment and related descriptions. The driving method of the pixel structure includes steps W11 to W14.

Step W11, in a first time, transmitting a first level driving signal through a scan line to turn on a first type of transistor, and ending a second A type of transistor, and a first image data is written into a pixel equivalent capacitance via a data line and a first type of transistor.

Step W12, at a second time, transmitting a second level driving signal via the scan line to turn off the first type of transistor and the second type of transistor.

Step W13, in a third time, transmitting a third level driving signal through the scan line to turn on the second type of transistor, cutting off the first type of transistor, and passing the signal line and the second type of transistor The second image data is written into the pixel equivalent capacitance.

In step W14, at a fourth time, the scan line transmits the second level of the driving signal to cut off the first type of transistor and the second type of transistor.

The detailed control method has been described in detail in the above embodiments, and thus will not be further described herein. In addition, in the embodiment, the driving method of the display panel is the same as the driving method of the pixel structure described above, and details are not described herein again.

In summary, the pixel structure, the display panel, and the driving method thereof according to the present invention use the first type of transistor in the pixel structure and the second type of transistor to have different actuation states at different voltage levels. By appropriately controlling the state of its operation, it is possible to insert black image data using only one scan line to improve the problem of dynamic blur. Compared with the prior art, the pixel structure, the display panel and the driving method thereof of the invention can reduce the opaque area of the pixel structure, thereby increasing the aperture ratio.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or variations to the spirit and scope of the invention are It should be included in the scope of the patent application attached.

1, 2‧‧‧ pixel architecture

3‧‧‧ display panel

31‧‧‧First substrate

32‧‧‧Liquid layer

33‧‧‧second substrate

C ₁₁ , C ₂₁ ‧ ‧ pixel equivalent capacitance

C _LC1 , C _LC2 ‧‧‧Liquid Crystal Capacitors

C _ST1 , C _ST2 ‧‧‧ storage capacitor

D ₁₁ , D ₂₁ ~ D _2m ‧‧‧ data line

L ₁ ‧‧‧first position

L ₂ ‧‧‧second level

L ₃ ‧‧‧ third position

S ₁₁ , S ₁₂ , S ₂₁ ~S _2n ‧‧‧ scan lines

T ₁₁ , T ₁₂ ‧‧‧O crystal

T ₂₁ ‧‧‧first type of crystal

T ₂₂ ‧‧‧Second type transistor

t _F ‧‧‧ frame time

t ₁₁ ~t ₁₄ , t ₂₁ ~t ₂₄ ‧‧‧ time

V _COM ‧‧‧Common voltage

V _LC1 , V _LC2 ‧‧‧ potential difference

W11~W14‧‧‧Steps

1 is a schematic diagram of a conventional pixel architecture; FIG. 2 is a timing diagram of a conventional pixel architecture; FIG. 3 is a schematic diagram of a pixel architecture of a preferred embodiment of the present invention; FIG. 5 is a schematic diagram of a pixel structure according to a preferred embodiment of the present invention; FIG. 6 is a schematic diagram of a display panel according to a preferred embodiment of the present invention; and FIG. 7 is a schematic diagram of a display panel according to a preferred embodiment of the present invention; A flow chart of the steps of the driving method of the display panel of the preferred embodiment.

2‧‧‧ pixel architecture

C ₂₁ ‧‧‧pixel equivalent capacitor

C _LC2 ‧‧‧Liquid Crystal Capacitor

C _ST2 ‧‧‧ storage capacitor

D ₂₁ ‧‧‧Information line

S ₂₁ ‧‧‧ scan line

T ₂₁ ‧‧‧first type of crystal

T ₂₂ ‧‧‧Second type transistor

V _COM ‧‧‧Common voltage

Claims (22)

A driving method of a pixel structure, which is matched with a scan line and a data line, and the pixel structure has a first type of transistor, a second type of transistor and a pixel equivalent capacitance, the first type The transistor is electrically connected to the scan line and the data line. The second type of transistor is electrically connected to the scan line, a signal line and the first type of transistor. The pixel equivalent capacitance and the first type are The driving method comprises the steps of: transmitting a driving signal of a first level through the scanning line to turn on the first type of transistor, and cutting off the first type of transistor a second type of transistor, and writing a first image data to the pixel equivalent capacitance via the data line and the first type of transistor; and transmitting a second level via the scan line at a second time Driving the signal to cut off the first type of transistor and the second type of transistor; and transmitting a third level of driving signal through the scan line to turn on the second type of transistor through a third time, ending the One type of electricity Body, and a second image data written to the pixel equivalent capacitance of the signal line via the transistor and the second type. The driving method of claim 1, further comprising the step of: transmitting, by the scan line, the driving signal of the second level to the first type of transistor and the second type of transistor during a fourth time . The driving method of claim 1, wherein the second level is between the first level and the third level. The driving method of claim 1, wherein the absolute value of the first level is greater than the absolute value of the voltage level of the first image data. The driving method of claim 1, wherein the absolute value of the third level is greater than the absolute value of the voltage level of the second image data. The driving method of claim 1, wherein the signal line is another scanning line. The driving method of claim 1, wherein the first type of transistor is an N-type MOS transistor, and the second type of transistor is a P-type MOS transistor. A display panel driving method has a scan line, a data line and a pixel structure, and the pixel structure has a first type of transistor, a second type of transistor and a pixel equivalent capacitance, the first A type of transistor is electrically connected to the scan line and the data line, and the second type of transistor is electrically connected to the scan line, a signal line and the first type of transistor, and the pixel equivalent capacitance and the first type The driving method comprises the steps of: transmitting a first level driving signal through the scan line to turn on the first type of transistor, at a first time, Terminating the second type of transistor, and passing the data line and the first type of transistor Writing a first image data to the pixel equivalent capacitance; and transmitting a second level driving signal through the scan line to cut off the first type of transistor and the second type of transistor; And transmitting a third level of driving signals through the scan line to turn on the second type of transistor, turning off the first type of transistor, and passing the signal line and the second type of transistor A second image data is written to the pixel equivalent capacitance. The driving method of claim 8, further comprising the step of: transmitting, by the scan line, the driving signal of the second level to the first type of transistor and the second type of transistor during a fourth time . The driving method of claim 8, wherein the second level is between the first level and the third level. The driving method of claim 8, wherein the absolute value of the first level is greater than the absolute value of the voltage level of the first image data. The driving method of claim 8, wherein the absolute value of the third level is greater than the absolute value of the voltage level of the second image data. The driving method of claim 8, wherein the signal line is another scanning line. The driving method of claim 8, wherein the first type of transistor is an N-type MOS transistor, The second type of transistor is a P-type MOS transistor. A pixel structure is used in combination with a scan line and a data line. The pixel structure includes: a first type of transistor electrically connected to the scan line and the data line; a second type of transistor; a scan line, a signal line and the first type of transistor are electrically connected; and a pixel equivalent capacitance electrically connected to the first type of transistor and the second type of transistor; wherein the first type of electricity The crystal and the second type of transistor are respectively MOS transistors of the opposite semiconductor doping type. The pixel structure of claim 15, wherein the first type of transistor is an N-type MOS transistor, and the second type of transistor is a P-type MOS transistor. The pixel structure as described in claim 15 wherein the signal line is another scan line. The pixel structure of claim 15, wherein the pixel equivalent capacitance comprises a liquid crystal capacitor and a storage capacitor electrically connected to each other. A display panel includes: a first substrate; and a second substrate disposed opposite to the first substrate, and having a pixel structure, a scan line, and a data line, wherein the pixel The structure has: a first type of transistor electrically connected to the scan line and the data line; a second type of transistor electrically connected to the scan line, a signal line and the first type of transistor; The pixel equivalent capacitance is electrically connected to the first type of transistor and the second type of transistor; wherein the first type of transistor and the second type of transistor are respectively opposite semiconductor doped types of MOS semiconductor Transistor. The display panel of claim 19, wherein the first type of transistor is an N-type MOS transistor, and the second type of transistor is a P-type MOS transistor. The display panel of claim 19, wherein the signal line is another scan line. The display panel of claim 19, wherein the pixel equivalent capacitance comprises a liquid crystal capacitor and a storage capacitor electrically connected to each other.