CN111399289B

CN111399289B - Display screen, display device and control method of display screen

Info

Publication number: CN111399289B
Application number: CN202010355319.1A
Authority: CN
Inventors: 高静; 褚洋
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2023-01-24
Anticipated expiration: 2040-04-29
Also published as: CN111399289A

Abstract

The invention provides a display screen, display equipment and a control method of the display screen. The first substrate includes a first electrode group arranged in a first direction, the second substrate includes a second electrode group arranged in a second direction, and a projection of the first electrode group on the liquid crystal layer overlaps a projection of the second electrode group on the liquid crystal layer. The driving circuit comprises a plurality of first signal lines and a plurality of second signal lines, the first electrode group receives a first driving signal through the first signal lines, and the second electrode group receives a second driving signal through the second signal lines so as to drive the liquid crystal unit in the projection overlapping area to deflect. The first electrode group and the second electrode group respectively obtain driving signals through the first signal line and the second signal line, so that liquid crystal is driven to deflect to realize display, a transistor is not required to be arranged, and the brightness of the display screen is improved.

Description

Display screen, display equipment and control method of display screen

Technical Field

The invention relates to the field of display, in particular to a display screen, display equipment and a control method of the display screen.

Background

In order to obtain higher contrast, two display panels can be arranged on the backlight module of the display screen to form a double box (double cell), and the intensity of the transmitted light of the pixels at the corresponding positions in the upper display panel is controlled by each pixel in the lower display panel, so that the contrast of the display screen can be greatly improved. On the other hand, the two display panels increase the number of film layers of the display screen, and the backlight passes through the two display panels with large light loss, which reduces the brightness of the display screen and further affects the display effect.

Disclosure of Invention

The invention provides a display screen capable of improving display effect, display equipment and a control method of the display screen.

The invention provides a display screen, which comprises a sub-panel and a main panel covering the sub-panel, wherein the sub-panel comprises a first substrate, a second substrate, a driving circuit and a liquid crystal layer positioned between the first substrate and the second substrate; the first substrate includes a plurality of first electrode groups arranged in a first direction, the second substrate includes a plurality of second electrode groups arranged in a second direction, the liquid crystal layer includes a plurality of liquid crystal cells, a projection of the first electrode groups on the liquid crystal layer overlaps a projection of the second electrode groups on the liquid crystal layer, the first electrode groups include a plurality of first electrodes, and the second electrode groups include a plurality of second electrodes; the driving circuit comprises a plurality of first signal lines and a plurality of second signal lines, the first electrode group receives a first driving signal through the first signal lines, and the second electrode group receives a second driving signal through the second signal lines so as to drive the liquid crystal unit in the projection overlapping area to deflect.

Further, the plurality of first electrodes of the first electrode group are arranged along a second direction, the plurality of second electrodes of the second electrode group are arranged along the first direction, the first direction is a row direction of the display screen, and the second direction is a column direction of the display screen.

Further, the driving circuit includes a demultiplexing circuit electrically connected to the first signal line, and the first electrode group receives a first driving signal through the first signal line and the demultiplexing circuit.

Further, the demultiplexing circuit includes an input terminal, a plurality of output terminals, and a plurality of switches, and the switch is disposed between each output terminal and the input terminal.

Further, the switch is triggered by a clock signal.

Further, the projections of the plurality of first electrodes on the second substrate are located in one second electrode.

Further, the pixel density of the sub-panel is not less than the pixel density of the main panel.

Furthermore, the display screen comprises a backlight module, the sub-panel is located between the backlight module and the main panel, and the backlight module is used for providing backlight for the sub-panel and the main panel.

In another aspect, the present invention further provides a display device, which includes the display screen as described above.

In another aspect, the present invention further provides a control method for a display screen, which is used for the display screen, and the control method includes: transmitting a first driving signal to the first electrode group through the first signal line, and transmitting a second driving signal to the second electrode group through the second signal line; the electric field of the projection overlapping area of the first electrode group and the second electrode group changes to drive the liquid crystal unit to deflect.

According to the liquid crystal display device, the first electrode group and the second electrode group respectively obtain the driving signals through the first signal line and the second signal line, liquid crystal is driven to deflect, display is achieved, a transistor is not needed, the brightness of a display screen is improved, and the display effect is improved.

Drawings

Fig. 1 is a schematic structural diagram of one embodiment of a display screen according to the present invention.

FIG. 2 is a schematic diagram of one embodiment of a drive circuit for a display screen.

Fig. 3 is a schematic diagram of another embodiment of a driving circuit of a display panel.

Fig. 4 is a schematic diagram of a demultiplexing circuit of the driving circuit shown in fig. 3.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front," "back," "lower," and/or "upper," and the like are for convenience of description, and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the display screen includes a sub-panel 1, a main panel 2 covering the sub-panel, and a backlight module 3, wherein the sub-panel 1 is located between the main panel 2 and the backlight module 3, in other embodiments, the positions of the sub-panel 1 and the main panel 2 may be interchanged, and the sub-panel 1 and the main panel 2 may be considered to be covered with each other. In this embodiment, the display panel is a VA liquid crystal (vertically aligned liquid crystal) display panel, but in other embodiments, other liquid crystal display panels may be used.

The display screen further comprises a first polarizer 41, a second polarizer 42 and a third polarizer 43, wherein the first polarizer 41 is located between the backlight module 3 and the sub-panel 1, the second polarizer 42 is located between the sub-panel 1 and the main panel 2, and the third polarizer 43 is located on one side of the main panel 2, which is far away from the sub-panel 1. Under the irradiation of the backlight module 3, the sub-panel 1 and the main panel 2 are used for displaying, the first polarizer 41, the second polarizer 42 and the third polarizer 43 are used for filtering light, and the backlight realizes the display of images through the sub-panel 1 and the main panel 2.

The sub-panel 1 comprises a first substrate 11, a second substrate 12, a driving layer 13 and a liquid crystal layer 14 located between the first substrate 11 and the second substrate 12. The first substrate 11 includes a plurality of first electrode groups 110 arranged in a first direction X, and each of the first electrode groups 110 includes a plurality of first electrodes 111 arranged in a second direction Y. The second substrate 12 includes a plurality of second electrode groups 120 arranged along the second direction Y, and each of the second electrode groups 120 includes a plurality of second electrodes 121 arranged along the first direction X. The liquid crystal layer 14 includes a plurality of liquid crystal cells. In this embodiment, the first electrode 111 is a pixel electrode, and the second electrode is a common electrode (i.e., a V-com electrode), but in other embodiments, the two electrodes may be interchanged. In this embodiment, the first direction X is a row direction of the display screen, and the second direction Y is a column direction of the display screen; in another embodiment, the first direction X may be a column direction, and the second direction Y may correspond to a row direction. It is easy to understand that there are one first electrode 111 and one second electrode 121 with overlapping projections between the first electrodes 111 (i.e. the first electrode group 110) arranged in the row direction and the second electrodes 121 (i.e. the second electrode group 120) arranged in the column direction, so that it is ensured that each liquid crystal cell of the liquid crystal layer 14 can be driven to deflect by applying driving voltages to different first electrode groups and second electrode groups.

The projection of the first electrode group 110 on the liquid crystal layer 14 overlaps with the projection of the second electrode group 120 on the liquid crystal layer 14, that is, the projection of one first electrode 111 in the first electrode group 110 and the projection of one second electrode 121 in the second electrode group 120 at least partially overlap. When the electric field between the first electrode 111 and the second electrode 121 in the projection overlapping region changes, the liquid crystal cell between the two electrodes (or located in the projection overlapping region) can be driven to deflect, and the transmitted light entering the main panel can be controlled. The sub-panel does not need to be provided with a transistor for driving the electrode, so that the backlight transmittance is improved, the brightness of the display screen (especially the maximum brightness of the display screen) is improved, and the display effect of the display screen is further improved.

The driving circuit 13 includes a plurality of first signal lines 132 and a plurality of second signal lines 133, the display screen further includes a control Chip (e.g., soC, system on Chip) 131, and the first signal lines 132 and the second signal lines 133 are electrically connected to the control Chip 131. The first signal lines 132 are disposed on the first substrate 11 and electrically connected to the first electrode sets 110, the second signal lines 133 are disposed on the second substrate 12 and electrically connected to the second electrode sets 120, each of the first signal lines 132 corresponds to one of the first electrode sets 110, and each of the second signal lines 133 corresponds to one of the second electrode sets 120. The first signal line 132 includes a first main line 1321 and a plurality of first branch lines 1322 connecting the first main line 1321 and the first electrode 111, and the second signal line 133 includes a second main line 1331 and a plurality of second branch lines 1332 connecting the second main line 1331 and the second electrode 121.

The control Chip 131 is connected to the first substrate 11 and the second substrate 12 through a COF (Chip on film) process, and is electrically connected to the first signal line 132 and the second signal line 133. That is, the first electrode group 110 receives a first driving signal (which may be understood as a row driving signal) of the control chip 131 through the first signal line 132, and the second electrode group 120 receives a second driving signal (which may be understood as a column driving signal) of the control chip 131 through the second signal line 133, so as to drive the liquid crystal cells in the projection overlapping region to deflect. Optionally, the driving signals of the first electrode 111 and the second electrode 121 may be triggered by a timing switch circuit.

Alternatively, the structure of the main panel 2 may be the same as that of the sub-panel 1, that is, the driving signal is directly transmitted through the signal line without providing a transistor; the main panel 2 may have a structure different from that of the sub-panel 1, for example, the pixel electrodes may be driven by thin film transistors, and other structures may be the same as the sub-panel 1, for example, two substrates and liquid crystal disposed between the substrates.

Referring to fig. 3 and fig. 4, in another embodiment, the driving circuit further includes a demultiplexing circuit 134, the demultiplexing circuit 134 is electrically connected to the first signal line 132 and the control chip 131, and the first electrode set 110 receives a first driving signal through the demultiplexing circuit 134 and the first signal line 132. The demultiplexing circuit comprises an input end F, a plurality of output ends (A, B, C) and a plurality of switches (K1, K2, K3), wherein the switch (K1 for example) is arranged between each output end (A for example) and the input end F. A plurality of switches (K1, K2, K3) input control signals through a control end and control the opening and closing states of the switches through a switch end. Optionally, the switches are triggered by a clock signal, that is, the switch terminal selects the corresponding switch to be closed by the clock signal control terminal, so as to turn on the circuit between the corresponding first signal line 132 and the control chip 131. For example, the clock signal CLK1 triggers the switch K1 to close, the clock signal CLK2 triggers the switch K2 to close, and the clock signal CLK3 triggers the switch K3 to close, so as to close the circuit between the different first signal lines and the control chip, that is, the first electrode can receive the first driving signal of the control chip 131, so as to drive the liquid crystal cell to deflect. In other embodiments, another demultiplexing circuit may be further disposed between the second signal line and the control chip 131.

Due to the arrangement of the demultiplexing circuit 134, a plurality of output ends can share one input end, so that the circuits of a bonding area can be reduced, and the wiring difficulty can be reduced; simultaneously, because the circuit reduces, can suitably reduce the size of nation's district again, and then the proportion of the effective display area of the display screen that improves (the ratio of the size of display area and whole display screen), and then the improvement sets up the screen of the display device of this display screen and accounts for the proportion.

Since the sub-panel is mainly used for controlling the luminance of transmitted light, in order to improve the transmittance of the backlight, the pixel density (pixel Per inc, which indicates the number of Pixels Per Inch) is usually designed to be small, but since the transistor for driving the electrode is eliminated in the present invention, the pixel density of the sub-panel can be set to be large, for example, equal to that of the main panel. In some embodiments, the pixel density of the sub-panel may also be less than the pixel density of the main panel.

Referring to fig. 3, in the present embodiment, projections of the plurality of first electrodes 111 on the second substrate 12 are located in one second electrode 121, that is, each second electrode 121 corresponds to a plurality of first electrodes 111. Because the number of the first electrodes 111 in a unit area is large, different liquid crystal cells can be driven to deflect in different directions respectively, so that the backlight of the main panel is more finely controlled, and the contrast of the display screen is further improved.

In another aspect, the invention further provides a display device comprising the display screen. The display device is, for example, a display, a notebook computer, a mobile phone, a flat panel television, a conference flat panel, or other devices having a display function. Of course, the display device may further include other components, such as a processing system, a storage system, a communication system, a power system, and the like, which are not described in detail in this embodiment.

In another aspect, the present invention further provides a method for controlling a display screen, which is used for the display screen described in any one of the foregoing embodiments, and the method includes:

step S10: the first driving signal is transmitted to the first electrode group through the first signal line, and the second driving signal is transmitted to the second electrode group through the second signal line.

Optionally, a demultiplexing circuit is disposed between the first signal line and the control chip, the demultiplexing circuit includes an input end, a plurality of output ends and a plurality of switches, the switch is disposed between each output end and the input end, and the switch is triggered by a clock signal. After the switch is closed, the corresponding first electrode group receives a first driving signal of the control chip through the first signal line.

Step S20: the electric field of the projection overlapping area of the first electrode group and the second electrode group changes to drive the liquid crystal unit to deflect.

Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. A display screen is characterized by comprising a sub-panel and a main panel covering the sub-panel, wherein the sub-panel comprises a first substrate, a second substrate, a driving circuit and a liquid crystal layer positioned between the first substrate and the second substrate;

the first substrate includes a plurality of first electrode groups arranged in a first direction, the second substrate includes a plurality of second electrode groups arranged in a second direction, the liquid crystal layer includes a plurality of liquid crystal cells, a projection of the first electrode groups on the liquid crystal layer overlaps a projection of the second electrode groups on the liquid crystal layer, the first electrode groups include a plurality of first electrodes, and the second electrode groups include a plurality of second electrodes; each second electrode corresponds to a plurality of first electrodes, and the projections of the plurality of first electrodes on the second substrate are positioned in the corresponding second electrodes;

the driving circuit comprises a plurality of first signal lines and a plurality of second signal lines, wherein each first signal line comprises a first main line and a plurality of first branch lines which are connected with the first main line and the first electrodes; each second signal line comprises a second main line and a plurality of second branch lines which are connected with the second main line and the second electrodes; the first electrode group receives a first driving signal through the first signal line, and the second electrode group receives a second driving signal through the second signal line so as to drive the liquid crystal unit in the projection overlapping area to deflect.

2. The display panel of claim 1, wherein the first plurality of electrodes of the first electrode set are arranged in a second direction, and the second plurality of electrodes of the second electrode set are arranged in a first direction, the first direction being a row direction of the display panel, and the second direction being a column direction of the display panel.

3. The display screen of claim 1, wherein the driving circuit comprises a de-multiplexing circuit electrically connected to the first signal line, and the first electrode set receives a first driving signal via the first signal line and the de-multiplexing circuit.

4. A display screen in accordance with claim 3, wherein the demultiplexing circuitry comprises an input, a plurality of outputs and a plurality of switches, the switches being disposed between each output and the input.

5. The display screen of claim 4, wherein the switch is triggered by a clock signal.

6. A display screen in accordance with claim 1, wherein the sub-panel has a pixel density not greater than the pixel density of the main panel.

7. A display screen according to any one of claims 1 to 6, wherein the display screen comprises a backlight module, the sub-panel is located between the backlight module and the main panel, and the backlight module is configured to provide backlight for the sub-panel and the main panel.

8. A display device characterized in that it comprises a display screen according to any one of claims 1 to 7.

9. A control method of a display screen for a display screen according to any one of claims 1 to 7, characterized by comprising:

transmitting a first driving signal to the first electrode group through the first signal line, and transmitting a second driving signal to the second electrode group through the second signal line;

the electric field of the projection overlapping area of the first electrode group and the second electrode group changes to drive the liquid crystal unit to deflect.