CN111210770A

CN111210770A - Pixel driving circuit, driving method thereof, display device and electronic equipment

Info

Publication number: CN111210770A
Application number: CN202010048112.XA
Authority: CN
Inventors: 崔志佳
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-05-29
Anticipated expiration: 2040-01-16
Also published as: CN111210770B

Abstract

The present disclosure relates to a pixel driving circuit and a driving method thereof, a display device, and an electronic apparatus, wherein the pixel driving circuit includes a driving unit, a first switch unit, an amplifying unit, and an energy storage unit, the driving unit includes a first end, a second end, and a control end, the first end of the driving unit is connected to a first power source end, and the second end is connected to a display unit; the first switch unit is connected with the data signal end at a first end, connected with a first node at a second end, connected with the scanning signal end at a control end, and conducted in response to the scanning signal so as to transmit the data signal to the first node; a first end of the amplifying unit is connected with the first node, a second end of the amplifying unit is connected with a control end of the driving unit, and the amplifying unit is used for amplifying the data signal; the energy storage unit is connected between the control end and the first end of the driving unit and used for storing the amplified data signal. The display quality of the display device is improved.

Description

Pixel driving circuit, driving method thereof, display device and electronic equipment

Technical Field

The disclosure relates to the technical field of electronic equipment, and in particular to a pixel driving circuit, a driving method thereof, a display device and electronic equipment.

Background

With the development and progress of the technology, the application of the special-shaped screen such as a curved screen is more and more extensive, and the special-shaped screen often comprises a plurality of display areas with different pixel densities. Due to the different pixel densities of the plurality of display areas, the problems of low display brightness and graininess of a display picture can occur in the area with low pixel density, and the display effect of the display device is influenced.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to a pixel driving circuit, a driving method thereof, a display device, and an electronic apparatus, so as to solve at least some problems of low display brightness and graininess of a display image in a low pixel density area due to different pixel densities of a plurality of display areas.

According to a first aspect of the present disclosure, there is provided a pixel driving circuit comprising:

the driving unit comprises a first end, a second end and a control end, wherein the first end of the driving unit is connected with a first power supply end, and the second end of the driving unit is connected with the display unit;

a first switch unit, a first end of which is connected to a data signal end, a second end of which is connected to a first node, a control end of which is connected to a scan signal end, and the first switch unit being turned on in response to a scan signal to transmit a data signal to the first node;

a first end of the amplifying unit is connected with the first node, a second end of the amplifying unit is connected with a control end of the driving unit, and the amplifying unit is used for amplifying the data signal;

and the energy storage unit is connected between the control end and the first end of the driving unit and used for storing the amplified data signal.

According to a second aspect of the present disclosure, there is provided a driving method of a pixel driving circuit, for the pixel driving circuit described above, the method including:

the first switch unit is conducted by utilizing the scanning signal so that the data signal is transmitted to the first node, and then the amplifying unit is conducted so that the amplified data signal is stored in the energy storage unit;

the driving unit is conducted by utilizing the signal in the energy storage unit so as to transmit the first power supply signal to the display unit.

According to a third aspect of the present disclosure, there is provided a display device including:

a first display area;

a second display area, the first display area having a pixel density less than the second display area;

in the pixel driving circuit, the pixel driving circuit is used for driving the display unit of the first display area.

According to a fourth aspect of the present disclosure, there is provided an electronic apparatus including the display device described above.

The pixel driving circuit provided by the embodiment of the disclosure amplifies data signals through the amplifying circuit, stores the amplified data signals in the energy storage unit, and then switches on the driving unit, drives the display unit to display, switches on the driving unit through the amplified data signals, and can improve the driving capability of the driving unit, thereby solving the problems of low display brightness and graininess of display pictures in the low pixel density area caused by different pixel densities of a plurality of display areas to at least a certain extent, and improving the display quality of the display device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram of a first pixel driving circuit provided in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic diagram of a second pixel driving circuit provided in an exemplary embodiment of the present disclosure;

fig. 3 is a schematic diagram of a third pixel driving circuit provided in an exemplary embodiment of the present disclosure;

fig. 4 is a schematic diagram of a fourth pixel driving circuit provided in an exemplary embodiment of the present disclosure;

fig. 5 is a timing diagram of a pixel driving circuit according to an exemplary embodiment of the disclosure;

fig. 6 is a flowchart of a driving method of a first pixel driving circuit according to an exemplary embodiment of the present disclosure;

fig. 7 is a schematic view of an electronic device provided in an exemplary embodiment of the present disclosure.

In the figure: 110. a drive unit; 120. a first switch unit; 130. an amplifying unit; 131. a totem-pole output circuit; 140. an energy storage unit; 150. a display unit; 160. a reset unit; 210. a first display area; 220. a second display area; 300. a camera; 20. a frame; 30. a main board; 40. a battery; 50. a rear cover;

DT, drive transistor; t1, a first transistor; t2, a second transistor; t3, a third transistor; t4, a fourth transistor; cst, storage capacitor; r1, a first resistor; r2 and a second resistor.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

In order to implement some specific functions in a display device of an electronic apparatus, it is often necessary to provide one or more designated display areas in the display device, where the pixel density of the designated display areas is less than that of other areas of the display device. For example, the four corners stretch the stretching corners of the curved screen, or the corresponding areas of the camera under the screen. Due to the low pixel density of the designated display area, the display device may have problems of low display brightness and graininess of the display screen in the area.

An exemplary embodiment of the present disclosure first provides a pixel driving circuit, as shown in fig. 1, the pixel driving circuit including: the driving unit 110, the first switching unit 120, the amplifying unit 130 and the energy storing unit 140; the driving unit 110 comprises a first terminal, a second terminal and a control terminal, the first terminal of the driving unit 110 is connected to a first power terminal, and the second terminal of the driving unit 110 is connected to the display unit 150; a first terminal of the first switch unit 120 is connected to the data signal terminal, a second terminal of the first switch unit 120 is connected to the first node, a control terminal of the first switch unit 120 is connected to the scan signal terminal, and the first switch unit 120 is turned on in response to the scan signal Sn to transmit the data signal Vdata to the first node; a first end of the amplifying unit 130 is connected to the first node, a second end of the amplifying unit 130 is connected to the control end of the driving unit 110, and the amplifying unit 130 is configured to amplify the data signal Vdata; the energy storage unit 140 is connected between the control terminal and the first terminal of the driving unit 110, and is used for storing the amplified data signal Vdata.

The pixel driving circuit provided by the embodiment of the disclosure amplifies the data signal Vdata through the amplifying circuit, stores the amplified data signal Vdata in the energy storage unit 140, further turns on the driving unit 110, drives the display unit 150 to display, turns on the driving unit 110 through the amplified data signal Vdata, can improve the driving capability of the driving unit 110, further solves the problems of low display brightness and display image granular sensation in a low pixel density area caused by different pixel densities of a plurality of display areas to at least a certain extent, and improves the display quality of the display device.

Further, as shown in fig. 2, the pixel driving circuit provided by the embodiment of the present disclosure may further include a reset unit 160. The first terminal of the reset unit 160 is connected to the initialization signal terminal, the second terminal of the reset unit 160 is connected to the control terminal of the driving unit 110, the control terminal of the reset unit 160 is connected to the reset control signal terminal, and the reset unit 160 is turned on in response to the reset control signal Vcs to transmit the initialization signal Vint to the control terminal of the driving unit 110.

The reset unit 160 can reset the storage capacitor Cst, so as to initialize the pixel driving circuit and avoid the problem that the signal in the storage circuit causes the display device to generate a smear or an afterimage during the image switching.

The following will describe each unit of the pixel driving circuit provided by the exemplary embodiment of the present disclosure in detail:

as shown in fig. 3, the amplifying unit 130 includes a totem-pole output circuit 131, a control terminal of the totem-pole output circuit 131 is connected to the first node, and an output terminal of the totem-pole output circuit 131 is connected to a control terminal of the driving unit 110.

The totem pole output circuit 131 may include a first transistor T1 and a second transistor T2. The first terminal of the first transistor T1 is connected to the second power source terminal, the second terminal of the first transistor T1 is connected to the control terminal of the driving unit 110, and the control terminal of the first transistor T1 is connected to the first node. The first terminal of the second transistor T2 is connected to the control terminal of the driving unit 110, the second terminal of the second transistor T2 is connected to the third power source terminal, the control terminal of the second transistor T2 is connected to the first node, and the first transistor T1 and the second transistor T2 are turned on in response to the data signal Vdata at the first node to amplify the data signal Vdata and store the amplified data signal Vdata in the energy storage unit 140.

The driving unit 110 includes a driving transistor DT having a first terminal connected to a first power source terminal, a second terminal connected to the display unit 150, and a control terminal connected to the energy storage unit 140, wherein the driving transistor DT is turned on in response to a signal stored in the energy storage unit 140 to transmit the first power source signal VDD to the display unit 150.

The first switch unit 120 includes a third transistor T3, a first terminal of the third transistor T3 is connected to the data signal terminal, a second terminal of the third transistor T3 is connected to the first node, a control terminal of the third transistor T3 is connected to the scan signal terminal, and the third transistor T3 is turned on in response to the scan signal Sn to transmit the data signal Vdata to the first node.

As shown in fig. 4, the reset unit 160 includes a fourth transistor T4, a first terminal of the fourth transistor T4 is connected to the initialization signal terminal, a second terminal of the fourth transistor T4 is connected to the control terminal of the driving transistor DT, a control terminal of the fourth transistor T4 is connected to the reset control signal terminal, and the fourth transistor T4 is turned on in response to the reset control signal Vcs to transmit the initialization signal Vint to the control terminal of the driving transistor DT, that is, to transmit the reset signal to the energy storage unit 140.

The reset control signal Vcs may be provided by the scan signal Sn of the adjacent row, for example, the reset control signal Vcs may be provided by the scan signal Sn of the previous row of the current row, or the reset control signal Vcs may be provided by the scan signal Sn of the next row of the current row. The reset control signal Vcs is provided by the scanning signal Sn of the adjacent row, so that signal sources and wiring of the pixel driving circuit can be reduced.

The energy storage unit 140 includes an energy storage capacitor Cst, one end of the energy storage capacitor Cst is connected to the first power terminal, and the other end of the energy storage capacitor Cst is connected to the control terminal of the driving transistor DT.

On this basis, the pixel driving circuit provided by the embodiment of the present disclosure further includes a first resistor R1 and a second resistor R2, wherein the first resistor R1 is connected between the second end of the first switch unit 120 and the first node; the second resistor R2 is connected between the amplifying unit 130 and the control terminal of the driving unit 110.

The display unit 150 may be an OLED (Organic Light Emitting Diode) display unit 150. The display unit 150 may include a pixel electrode layer, a light emitting layer, and a common electrode layer. The second terminal of the driving transistor DT is connected to the pixel electrode layer, and the common electrode layer is connected to a fourth power source terminal. The current flowing through the display unit 150 is controlled by the opening degree of the driving transistor DT, thereby controlling the light emission luminance of the display unit 150. The data signal Vdata is amplified by the amplifying circuit, and the aperture of the driving transistor DT is increased, so that the current flowing through each driving transistor is increased, and the luminance of the display unit 150 is increased. The problems of low display brightness and graininess of a display picture in a low pixel density area of a display device are solved.

It is understood that the display unit 150 may also be an lcd (liquid Crystal display) display unit 150, and the display unit 150 includes a pixel electrode layer, a liquid Crystal layer, and a common electrode layer. The second terminal of the driving transistor DT may be connected to the pixel electrode layer, and the common electrode layer may be connected to a fourth power source terminal. The voltage applied to the pixel electrode is controlled by the opening of the driving transistor DT, and the deflection angle of the liquid crystal is adjusted to control the luminance of the display unit 150. The data signal Vdata is amplified by the amplifying circuit, and the opening degree of the driving transistor DT is increased, so that the voltage applied to the pixel electrode is increased, and the brightness of the display unit 150 is increased. The problems of low display brightness and graininess of a display picture in a low pixel density area of a display device are solved.

In the present exemplary embodiment, each transistor has a control terminal, a first terminal, and a second terminal. Specifically, the control terminal of each transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; alternatively, the control terminal of each transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. Further, each transistor may be an enhancement transistor or a depletion transistor, which is not particularly limited in this exemplary embodiment.

On the basis, all the transistors can be N-type thin film transistors, and the driving voltage of each transistor is high-level voltage; alternatively, all the transistors may be P-type thin film transistors, and the driving voltage of each transistor is a low level voltage.

The operation of the pixel driving circuit will be described in detail with reference to the operation timing chart of the pixel driving circuit shown in fig. 5. The driving timing diagram shows the level states of the reset control signal Vcs, the scan signal Sn, the second power signal Vcc, and the data signal Vdata in three periods.

First period t1 (reset phase): the reset control signal Vcs is at a high level, the scan signal Sn is at a low level, the fourth transistor T4 is turned on, the first transistor T1, the second transistor T2 and the third transistor T3 are turned off, and the initialization signal Vint is transmitted to the storage capacitor Cst and the control terminal of the driving transistor DT. The storage capacitor Cst and the control terminal of the driving transistor DT are reset.

Second period t2 (data enlargement writing phase): the reset control signal Vcs is at a low level, the scan signal Sn is at a high level, the first transistor T1, the second transistor T2, and the third transistor T3 are turned on, and the fourth transistor T4 is turned off. The third transistor T3 is turned on by a high level of the scan signal Sn, the data signal Vdata is transmitted to the control terminals of the first and second transistors T1 and T2, and the first and second transistors T1 and T2 are turned on. The second power signal Vcc flows through the first transistor T1 and the second transistor T2, and the voltage of the second terminal of the first transistor T1 is varied. The specific voltage value is related to the opening degrees of the first transistor T1 and the second transistor T2, i.e., related to the data voltage signal, and thus it is substantially amplified for the data signal Vdata through the first transistor T1, the second transistor T2, and the second power signal Vcc. The amplified data signal Vdata is stored in the storage capacitor Cst.

In a third period T3 (display phase), the reset control signal Vcs is at a low level, the scan signal Sn is at a low level, the first transistor T1, the second transistor T2, the third transistor T3 are turned on, and the fourth transistor T4 are turned off. The driving transistor DT is turned on by a signal stored in the storage capacitor Cst, the first power signal VDD is applied to the display unit 150, and the display unit 150 displays the image.

It should be noted that: in the above specific embodiment, all transistors are N-type transistors; those skilled in the art will readily appreciate that pixel drive circuits provided in accordance with the present disclosure have all transistors in the form of P-type transistors. In an exemplary embodiment of the present disclosure, all the transistors may be P-type transistors. The adoption of the all-P type thin film transistor has the following advantages: for example, strong noise suppression; for example, low level is easy to realize in charge management because of low level conduction; for example, the P-type thin film transistor has simple manufacturing process and relatively low price; such as better stability of the P-type thin film transistor, etc. Of course, the pixel driving circuit provided in the present disclosure may also be replaced by a CMOS (Complementary Metal oxide semiconductor) circuit, etc., and is not limited to the pixel driving circuit provided in this embodiment, and will not be described herein again.

Illustratively, the third transistor T3 and the driving transistor DT are respectively an address TFT (thinfilm transistor), a thin film transistor and a driving TFT of the pixel driving circuit, the first transistor T1 and the second transistor T2 are respectively an NPN-type BJT and a PNP-type BJT, a point B is a common base, a point C1 is a collector of the first transistor T1, a point E is an emitter of the first transistor T1 and an emitter of the second transistor T2, and a point C2 is a collector of the second transistor T2.

When the data signal Vdata is at a high level and is smaller than the collector voltage of the first transistor T1 (the second power signal Vcc), the collector junction of the first transistor T1 is reverse biased, the emitter junction is forward biased, and the current of the first transistor T1 flows from the collector junction to the emitter junction, thereby causing the gate voltage of the driving transistor DT to increase, the energy is provided by the second power source, and the driving capability increases. When the data signal Vdata is at a low level, the emitter junction of the second transistor T2 is forward biased, the collector junction is reverse biased, the transistor current of the second transistor T2 flows from the emitter to the collector, and the gate of the driving transistor DT discharges through the junction capacitor.

Generally, the data signal Vdata is output from the common end of the emitter of the triode through a totem pole output circuit 131 to obtain a gate signal of the driving transistor DT with greatly enhanced driving capability, and from the energy perspective, the weak signal is taken (acquired) from the second power source end through the NPN BJT and the PNP BJT, thereby becoming a gate driving signal with high energy.

Compared with the pixel driving circuit in a normal region, the circuit is applied to the pixel driving circuit in a low PPI region, the grid voltage of the driving transistor DT can be increased under the condition that the same data signal Vdata is input, and the pixel driving current of the circuit is larger than that of the pixel driving circuit in the normal region under the condition that Vgs-Vth is larger than Vds, so that the low PPI region obtains larger display brightness, and the display effect is optimized.

It should be noted that the third power source terminal and the fourth power source terminal may be ground terminals, that is, the third power source signal VSS2 and the fourth power source signal VSS1 may be zero potential signals. Of course, in practical applications, the second power signal VSS2 and the fourth power signal VSS1 may be other fixed potentials, which is not specifically limited in the embodiment of the disclosure.

The exemplary embodiment of the present disclosure also provides a driving method of a pixel driving circuit, as shown in fig. 6, the method including:

step S610, the first switch unit is conducted by utilizing the scanning signal so as to enable the data signal to be transmitted to the first node, and then the amplifying unit is conducted so as to store the amplified data signal in the energy storage unit;

in step S620, the driving unit is turned on by using the signal in the energy storage unit to transmit the first power signal to the display unit.

According to the driving method of the pixel driving circuit provided by the embodiment of the disclosure, the data signal Vdata is amplified through the amplifying circuit, the amplified data signal Vdata is stored in the energy storage unit 140, the driving unit 110 is further conducted to drive the display unit 150 to display, and the driving unit 110 is conducted through the amplified data signal Vdata, so that the driving capability of the driving unit 110 can be improved, the problems of low display brightness and display image granular sensation in a low pixel density region caused by different pixel densities of a plurality of display regions are solved at least to a certain extent, and the display quality of the display device is improved.

Further, when the pixel driving circuit further includes the reset unit 160, the driving method of the pixel driving circuit provided by the embodiment of the present disclosure may further include:

in step S630, the reset unit is turned on and the first switching unit and the amplifying circuit are turned off by using the reset control signal and the scan signal, so as to transmit the initialization signal to the control terminal of the driving transistor and the energy storage capacitor.

Wherein, step S630 may be performed before step S610, in step S630, the reset control signal Vcs is at a high level, the scan signal Sn is at a low level, the fourth transistor T4 is turned on, the first transistor T1, the second transistor T2 and the third transistor T3 are turned off, and the initialization signal Vint is transmitted to the control terminals of the storage capacitor Cst and the driving transistor DT. The storage capacitor Cst and the control terminal of the driving transistor DT are reset.

In step S610, the reset control signal Vcs is at a low level, the scan signal Sn is at a high level, the first transistor T1, the second transistor T2, and the third transistor T3 are turned on, and the fourth transistor T4 is turned off. The third transistor T3 is turned on by a high level of the scan signal Sn, the data signal Vdata is transmitted to the control terminals of the first and second transistors T1 and T2, and the first and second transistors T1 and T2 are turned on. The second power signal Vcc flows through the first transistor T1 and the second transistor T2, and the voltage of the second terminal of the first transistor T1 is varied. The specific voltage value is related to the opening degrees of the first transistor T1 and the second transistor T2, i.e., related to the data voltage signal, and thus it is substantially amplified for the data signal Vdata through the first transistor T1, the second transistor T2, and the second power signal Vcc. The amplified data signal Vdata is stored in the storage capacitor Cst.

In step S620, the reset control signal Vcs is at a low level, the scan signal Sn is at a low level, the first transistor T1, the second transistor T2, the third transistor T3 are turned on, and the fourth transistor T4 is turned off. The driving transistor DT is turned on by a signal stored in the storage capacitor Cst, the first power signal VDD is applied to the display unit 150, and the display unit 150 displays the image.

It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.

The exemplary embodiments of the present disclosure also provide a display device including a first display region, a second display region, and the pixel driving circuit described above. The pixel density of the first display area is less than that of the second display area; the pixel driving circuit is used to drive the display unit 150 of the first display region.

Wherein the real elements in the second display area may be driven by a conventional 3T1C driving circuit. For example, the first display area may be a bent portion of a curved screen or an area where a camera under the screen is located.

The first display region may include at least one display unit, which may be a red pixel unit, a blue pixel unit, or a green pixel unit; the second display region may include at least one display unit, which may be a red pixel unit, a blue pixel unit, or a green pixel unit.

According to the display device provided by the embodiment of the disclosure, the data signal Vdata is amplified through the amplifying circuit in the pixel driving circuit corresponding to the first display area with low pixel density, the amplified data signal Vdata is stored in the energy storage unit 140, the driving unit 110 is further turned on, the display unit 150 is driven to display, the driving unit 110 is turned on through the amplified data signal Vdata, the driving capability of the driving unit 110 can be improved, and the problems of low display brightness and granular feeling of display pictures in the area with low pixel density caused by different pixel densities of the plurality of display areas are solved at least to a certain extent, so that the display quality of the display device is improved.

Further, the display device provided by the embodiment of the disclosure further includes a gamma adjusting circuit, connected to the pixel driving circuit, and configured to provide a first data signal Vdata to the pixel unit of the first display region and provide a second data signal Vdata to the pixel unit of the second display region, where when a theoretical gray scale of the pixel unit of the first display region is the same as a theoretical gray scale of the pixel unit of the second display region, a voltage of the first data signal Vdata is greater than a voltage of the second data signal Vdata.

The theoretical gray scale of the pixel unit is a display gray scale calculated according to a picture to be displayed by the display device. When the theoretical gray scale of the pixel unit of the first display area is the same as that of the pixel unit of the second display area, the voltage of the first data signal Vdata is greater than that of the second data signal Vdata. The voltage of the data signal Vdata transmitted to the first display area can be increased, the actual display brightness of the first display area is further improved, the problems that due to the fact that the pixel densities of the display areas are different, the display brightness is low and the display image is granular are caused in the area with low pixel density are further solved, and the display quality of the display device is improved.

The display device provided by the embodiment of the present disclosure may be an OLED display device including a plurality of OLED display units 150, and the display units 150 may include a pixel electrode layer, a light emitting layer, and a common electrode layer. The second terminal of the driving transistor DT is connected to the pixel electrode layer, and the common electrode layer is connected to a fourth power source terminal. The current flowing through the display unit 150 is controlled by the opening degree of the driving transistor DT, thereby controlling the light emission luminance of the display unit 150. The data signal Vdata is amplified by the amplifying circuit, and the aperture of the driving transistor DT is increased, so that the current flowing through each driving transistor is increased, and the luminance of the display unit 150 is increased. The problems of low display brightness and graininess of a display picture in a low pixel density area of a display device are solved.

It is understood that the display device provided by the embodiment of the present disclosure may be an LCD display device, the LCD display device includes a plurality of LCD display units 150, and the display units 150 include a pixel electrode layer, a liquid crystal layer, and a common electrode layer. The second terminal of the driving transistor DT may be connected to the pixel electrode layer, and the common electrode layer may be connected to a fourth power source terminal. The voltage applied to the pixel electrode is controlled by the opening of the driving transistor DT, and the deflection angle of the liquid crystal is adjusted to control the luminance of the display unit 150. The data signal Vdata is amplified by the amplifying circuit, and the opening degree of the driving transistor DT is increased, so that the voltage applied to the pixel electrode is increased, and the brightness of the display unit 150 is increased. The problems of low display brightness and graininess of a display picture in a low pixel density area of a display device are solved.

The exemplary embodiment of the present disclosure also provides an electronic device including the display device described above.

The display device may include any product or component having a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.

As shown in fig. 7, the electronic device provided in the embodiment of the present disclosure further includes a camera 300, a bezel 20, a main board 30, a battery 40, and a rear cover 50. Wherein, the display device is mounted on the frame 20 to form a display surface of the electronic device, and the display device serves as a front shell of the electronic device. The rear cover 50 is adhered to the frame by double-sided adhesive, and the display device, the frame 20 and the rear cover 50 form an accommodating space for accommodating other electronic elements or functional modules of the electronic device. Meanwhile, the display device forms a display surface of the electronic apparatus for displaying information such as images, texts, and the like. The Display device may be a Liquid Crystal Display (LCD) or an organic light-Emitting Diode (OLED) Display.

A glass cover plate may be provided on the display device. The glass cover plate can cover the display device to protect the display device and prevent the display device from being scratched or damaged by water.

The display device may be a full-screen. At this time, the display device may display information in a full screen, so that the electronic apparatus has a large screen occupation ratio. The display device may include a first display area 210 and a second display area 220. The camera needs the display screen printing opacity when using under the screen, consequently sets up the printing opacity district in the first display area of low pixel density, can increase the luminousness. The camera 300 in the electronic device may be disposed below the first display area 210, that is, on a side of the first display area away from the light emitting side, and the first display area with high transmittance may increase the intensity of light received by the camera 300. Wherein the camera 300 may be a front camera. Functional modules such as proximity sensor can hide in display device below, and electronic equipment's fingerprint identification module can set up the back at electronic equipment.

The bezel 20 may be a hollow frame structure. The material of the frame 20 may include metal or plastic. The main board 30 is mounted inside the receiving space. For example, the main board 30 may be mounted on the frame 20 and accommodated in the accommodating space together with the frame 20. The main board 30 is provided with a grounding point to realize grounding of the main board 30. One or more of the functional modules such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a proximity sensor, an ambient light sensor, a gyroscope, and a processor may be integrated on the main board 30. Meanwhile, the display device may be electrically connected to the main board 30.

The main board 30 is provided with a display control circuit. The display control circuit outputs an electric signal to the display device to control the display device to display information.

The battery 40 is mounted inside the receiving space. For example, the battery 40 may be mounted on the frame 20 and be accommodated in the accommodating space together with the frame 20. The battery 40 may be electrically connected to the motherboard 30 to enable the battery 40 to power the electronic device. The main board 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic components in the electronic device.

The rear cover 50 serves to form an outer contour of the electronic apparatus. The rear cover 50 may be integrally formed. In the forming process of the rear cover 50, a rear camera hole, a fingerprint identification module mounting hole and the like can be formed in the rear cover 50.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.

Claims

1. A pixel driving circuit, comprising:

2. The pixel driving circuit according to claim 1, wherein the amplifying unit includes:

and the control end of the totem-pole output circuit is connected to the first node, and the output end of the totem-pole output circuit is connected to the control end of the driving unit.

3. The pixel driving circuit of claim 2, wherein the totem-pole output circuit comprises:

a first transistor, a first terminal of which is connected to a second power terminal, a second terminal of which is connected to the control terminal of the driving unit, and a control terminal of which is connected to the first node;

and a first end of the second transistor is connected with the control end of the driving unit, a second end of the second transistor is connected with a third power supply end, a control end of the second transistor is connected with the first node, and the first transistor and the second transistor are turned on in response to a data signal of the first node to amplify the data signal and store the amplified data signal in the energy storage unit.

4. The pixel driving circuit according to claim 1, wherein the driving unit includes:

the first end of the driving transistor is connected with the first power supply end, the second end of the driving transistor is connected with the display unit, the control end of the driving transistor is connected with the energy storage unit, and the driving transistor is conducted in response to a signal stored in the energy storage unit so as to transmit a first power supply signal to the display unit.

5. The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises:

a first resistor connected between the second terminal of the first switching unit and the first node;

and the second resistor is connected between the amplifying unit and the control end of the driving unit.

6. The pixel driving circuit according to claim 1, wherein the pixel driving circuit further comprises:

the first end of the reset unit is connected to the initialization signal end, the second end of the reset unit is connected to the control end of the driving unit, the control end of the reset unit is connected to the reset control signal end, and the reset unit is conducted in response to the reset control signal so as to transmit the initialization signal to the control end of the driving unit.

7. A method of driving a pixel driver circuit, for use in a pixel driver circuit as claimed in any one of claims 1 to 6, the method comprising:

8. A display device, characterized in that the display device comprises:

a first display area;

a pixel driving circuit as claimed in any one of claims 1 to 6, for driving a display element of the first display region.

9. The display device according to claim 8, wherein the display device further comprises:

and the gamma adjusting circuit is connected with the pixel driving circuit and is used for providing a first data signal for the pixel units of the first display area and providing a second data signal for the pixel units of the second display area, and when the theoretical gray scale of the pixel units of the first display area is the same as that of the pixel units of the second display area, the voltage of the first data signal is greater than that of the second data signal.

10. The display device according to claim 8, wherein the display unit is an organic light emitting diode display unit.

11. The display device according to claim 8, wherein the display unit is a liquid crystal display unit.

12. An electronic device characterized in that the electronic device comprises a display device according to any one of claims 9-11.

13. The electronic device of claim 12, wherein the electronic device further comprises:

the camera is arranged on one side, away from the light emitting side, of the first display area.