CN108957816B

CN108957816B - Display screen assembly, display device and driving method thereof

Info

Publication number: CN108957816B
Application number: CN201811075599.XA
Authority: CN
Inventors: 程才权; 游利军; 欧阳伟萍
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2018-09-14
Filing date: 2018-09-14
Publication date: 2021-03-30
Anticipated expiration: 2038-09-14
Also published as: CN108957816A

Abstract

The application provides a display screen assembly, a display device and a driving method thereof. The display screen assembly comprises a display screen, a light sensing element and a light sensing driving assembly; the display screen comprises a first substrate, a second substrate and a liquid crystal layer, wherein: the liquid crystal display panel comprises a first substrate, a second substrate, a liquid crystal layer and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is arranged between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules; the display screen provides a display picture for a user at one side of the first substrate far away from the second substrate, and the light sensing element is arranged at one side of the liquid crystal layer far away from the first substrate; the light sensation driving component is arranged on the first substrate and/or the second substrate and drives the liquid crystal molecules to rotate when the display screen is in a screen resting state, so that light of the light sensation element can be transmitted in the liquid crystal layer. This makes it possible to dispose the light-sensing element under the screen in the liquid crystal display device.

Description

Display screen assembly, display device and driving method thereof

Technical Field

The present disclosure relates to display technologies, and particularly to a display screen assembly, a display device and a driving method thereof.

Background

The existing Light sensing element has been transferred to the bottom of the screen in the OLED (Organic Light-Emitting Diode) product.

For the liquid crystal display device, LTPS (Low Temperature polysilicon) is widely used because it is ultra-thin, light, and Low in power consumption, and can provide more beautiful colors and clearer images. However, the LTPS generally adopts the FFS driving principle, that is, when the display screen is in the information mode, the liquid crystal light valve is in the normally dark mode, so that the transmission of the light sensing element in the display screen cannot be realized, thereby limiting the application of the light sensing element in the liquid crystal display device under the screen.

Disclosure of Invention

The application provides a display screen assembly, which comprises a display screen, a light sensing element and a light sensing driving assembly;

the display screen comprises a first substrate, a second substrate and a liquid crystal layer, wherein: the display screen comprises a display area and a non-display area, the liquid crystal layer is arranged corresponding to the display area, and at least part of the light sensing element corresponds to the display area;

the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is arranged between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules;

the display screen provides a display picture for a user at one side of the first substrate far away from the second substrate, and the light sensing element is arranged at one side of the liquid crystal layer far away from the first substrate;

the light sensation driving component is arranged on the first substrate and/or the second substrate and drives the liquid crystal molecules to rotate when the display screen is in a light sensation state, so that light received by the light sensation element can be transmitted in the liquid crystal layer.

The application also provides a display device, and display device includes display screen subassembly and backlight unit, the display screen subassembly includes the preamble the display screen subassembly, backlight unit to the display screen of display screen subassembly provides backlight.

The application further provides a driving method of the display device, the display device comprises a display screen assembly and a backlight module, the display screen assembly comprises a display screen, a light sensing element and a light sensing driving assembly, the display screen comprises a first substrate, a second substrate and a liquid crystal layer, the display screen comprises a display area and a non-display area, the liquid crystal layer is arranged corresponding to the display area, and at least part of the light sensing element corresponds to the display area; the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is arranged between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules;

the driving method includes:

the backlight module stops providing backlight for the display screen, the first substrate and the second substrate stop driving liquid crystal molecules in the liquid crystal layer to rotate, and the display screen is in a screen refreshing state; the light sensation driving component drives the liquid crystal molecules in the liquid crystal layer to rotate, so that light received by the light sensation element can be transmitted in the liquid crystal layer.

This application is through setting up light sense drive assembly on first base plate and/or second base plate, and it is rotatory to drive the liquid crystal molecule when the display screen is in the rest screen for light sense component received light can transmit in the liquid crystal layer, can realize from this that light sense component sets up under the screen in liquid crystal display device.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an overall structure of a display screen assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a disassembled structure of the display screen assembly shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of the broken line A1A2 shown in FIG. 2;

FIG. 4 is a schematic cross-sectional view of B1B2 in dotted line in FIG. 2;

fig. 5 is a schematic top view of a TFT substrate according to an embodiment of the present disclosure;

FIG. 6 is a schematic view of a structure of a light-sensing driving element disposed on a TFT substrate according to the present application;

fig. 7 is a schematic structural diagram of a display device 700 according to an embodiment of the present disclosure;

fig. 8 is a schematic flowchart of a driving method of a display device according to an embodiment of the present disclosure;

fig. 9 is a waveform diagram of a driving signal of the driving method shown in fig. 8.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic overall structure diagram of a display screen assembly according to an embodiment of the present application, and fig. 2 is a schematic disassembly structure diagram of the display screen assembly shown in fig. 1. As shown in fig. 1, the display panel assembly 10 includes a display panel 100, a light sensing element 200 and a light sensing driving assembly 300.

The display screen 100 includes a display area a11 and a non-display area a 12.

In other embodiments, the display screen 100 may also include only the display area a11, i.e., a full-screen.

The display panel 100 includes a first substrate 103, a second substrate 104, and a liquid crystal layer 105.

The first substrate 103 and the second substrate 104 are disposed opposite to each other. The liquid crystal layer 105 is disposed between the first substrate 103 and the second substrate 104. The liquid crystal layer 105 includes a plurality of liquid crystal molecules 1051. The liquid crystal layer 105 is disposed corresponding to the display area a11 of the display screen 100. The liquid crystal molecules 1051 have anisotropy, and are rotatable in an electric field formed by the first and

second substrates

103 and 104, so that incident light passes through to display a display screen to a user. As shown in fig. 1, light enters from the second substrate 104, passes through the liquid crystal layer 105, and exits from the first substrate 103 on a side away from the second substrate 104, so as to provide a display screen to a user.

The first substrate 103 may be a CF substrate, please refer to fig. 2-4, wherein fig. 2 is a schematic top view of the CF substrate, and fig. 3 and 4 are schematic cross-sectional views corresponding to the dashed line A1a2 and the dashed line B1B2 shown in fig. 2, respectively. The CF substrate 103 includes a CF substrate 1011, a filter layer 1012, and a black matrix layer 1013.

The CF substrate 1011 can be made of glass, plastic, etc.

A filter layer 1012 and a black matrix layer 1013 are disposed on the substrate 1011.

The filter layer 1012 includes a first filter unit 1014 filtering blue and green light, a second filter unit 1015 filtering blue and red light, and a third filter unit 1016 filtering green and red light. That is, the first filter unit 1014 emits red light, the second filter unit 1015 emits green light, and the third filter unit 1016 emits blue light. The first filtering unit 1014, the second filtering unit 1015, and the third filtering unit 1016 are sequentially disposed.

The black matrix layer 1013 is provided between adjacent two filter layers 1012.

Further, the CF basically further includes an insulating layer 1017 provided on the filter layer 1012 and the black matrix layer 1013 on the side away from the CF substrate 1011.

The second substrate 104 may be a TFT substrate. Referring to fig. 5, fig. 5 is a schematic top view of the TFT substrate, and the TFT substrate 104 may include a TFT substrate 1020, a plurality of scan lines S disposed on the TFT substrate 1020, a plurality of data lines D, a plurality of switching tubes 1021, and a plurality of pixel electrodes 1022.

The scan lines S and the data lines D are enclosed into a plurality of pixel units 1023. A switching tube 1021 and a pixel electrode 1022 are provided in the pixel unit 1023. The control terminal of the switching tube 1021 is electrically connected to the scan line S, the input terminal thereof is electrically connected to the data line D, and the output terminal thereof is electrically connected to the pixel electrode 1022.

When the scan line S provides an on scan line signal to the control terminal of the switching tube 1021, the switching tube 1021 is turned on, and the data line D provides a data signal to the input terminal of the switching tube 1021 for outputting to the pixel electrode 1022. The pixel electrode 1022 cooperates with the common electrode on the CF substrate 103 to form an electric field for rotating the liquid crystal molecules 1051 of the liquid crystal layer 105 after receiving the data signal. Thus, light incident on the TFT substrate 104 side passes through the liquid crystal layer 105 and exits from the CF substrate 103 side, thereby displaying. This state may be a bright screen state, i.e., a display state, of the display screen 100.

When the scan line S provides a scan line signal for turning off to the control end of the switching tube 1021, the switching tube 1021 is turned off, the data line D stops providing the data signal to the input end of the switching tube 1021, and the pixel electrode 1022 does not receive the data signal. So that there is no electric field between the CF substrate 103 and the TFT substrate 104 that can rotate the liquid crystal molecules 1051 of the liquid crystal layer 105. The liquid crystal molecules 1051 are in the original state, i.e., the off state, and block the transmission of light, thereby implementing the screen-off of the display screen 100. This state may be a screen-off state, i.e., a non-display state, of the display screen 100.

The light sensing element 200 may include an infrared light sensor, an ambient light sensor, and the like. The infrared light sensor can sense by emitting and receiving infrared light, for example, the infrared light distance sensor can sense distance by emitting and receiving infrared light. The ambient light sensor may sense the intensity of the ambient light by receiving the ambient light.

The light sensing element 200 is disposed on a side of the liquid crystal layer 105 away from the first substrate 103, as shown in fig. 2, it may be specifically disposed on a side of the second substrate 104 away from the liquid crystal layer 105, and disposed in the display area a11, i.e. the light sensing element 200 is hidden by the display screen 100. This saves the installation space in the non-display area a12 of the display screen 100, and facilitates the narrow-frame or full-screen effect.

In other embodiments, the light sensing element 200 may also be disposed between the second substrate 104 and the liquid crystal layer 105. The light sensing element 200 may also be partially disposed in the display area a 11.

Since the light sensing element 200 is disposed on the side of the liquid crystal layer 105 away from the first substrate 103, the light of the light sensing element 200 needs to pass through the liquid crystal layer 105. Which is affected by the rotation state of the liquid crystal molecules 1051 in the liquid crystal layer 105. The light of the light sensing element 200 includes the light emitted by the light sensing element 200 and the light received by the light sensing element 200 or only the light received by the light sensing element 200. Particularly with respect to the type of light-sensing element 200.

As described above, when the display panel 100 is a holographic panel, the liquid crystal molecules 1051 are not rotated and are in the original state, and thus, the transmission of light is blocked, which greatly affects the application of the photosensitive element 200. Based on this, the present application provides a light sensing driving assembly 300 for driving the liquid crystal molecules 1051 to rotate when the display panel 100 is in a rest state, so that the light of the light sensing element 200 can be transmitted in the liquid crystal layer 105.

Specifically, please refer to fig. 2 and 4 again. The photo-sensing driving element 300 is disposed on the CF substrate. And is located in the display area corresponding to the light-sensing area 1018 of the light-sensing element 200.

The photo sensing driving assembly 300 includes a plurality of driving electrodes 301 disposed at intervals and a plurality of driving signal lines 302 disposed at intervals. The number of the driving electrodes 301 and the number of the driving signal lines 302 are the same and correspond to each other, and the driving signal lines 302 provide driving signals to the driving electrodes 301 when the display screen 100 is in a screen-off state.

The potentials of the driving signals received by the two adjacent driving electrodes 301 are opposite, so that the polarities of the two adjacent driving electrodes 301 are opposite. Thereby forming an electric field between the adjacent two drive electrodes 301 to drive the liquid crystal molecules 1051 in the liquid crystal layer 105 to rotate. The direction of the electric field formed between two adjacent driving electrodes 301 is perpendicular to the direction of the electric field formed between the first substrate 103 and the second substrate 104 described above.

The potentials of the driving signals at the two adjacent transmission timings are opposite, so that the polarities of the driving electrodes 301 at the two adjacent transmission timings are opposite. In particular, it can transmit driving signals in the form of alternating current, and the potential of the driving signals can be changed. Thereby, the liquid crystal molecules 1051 in the liquid crystal layer 105 can be prevented from being polarized.

As shown in fig. 4, on the CF substrate, the driving electrode 301 is disposed on the black matrix layer 1013. The driving signal line 302 is disposed on the driving electrode 301, and more specifically, the driving electrode 301 is disposed between the black matrix layer 1013 and the insulating layer 1017, and the driving signal line 302 is disposed on the insulating layer 1017 and electrically connected to the driving electrode 301 through the via hole 1019 of the insulating layer 1017.

The driving signal lines 302 may be made of the same material as the scan lines S and the data lines D. Similarly, the driving electrode 301 may be made of the same material as the pixel electrode, and may be an ITO (indium tin oxide) thin film.

Therefore, in the present embodiment, the liquid crystal molecules 1051 are driven to rotate by the light sense driving assembly 300 when the display panel 200 is in the rest state, so that the light of the light sense element 200 can be transmitted through the liquid crystal layer 105, thereby realizing the arrangement of the light sense element 200 under the panel of the liquid crystal display device.

For example, if the photo sensor device 200 is an infrared light distance sensor, when the display panel 200 is in the rest state, the driving signal line 301 of the photo sensing driving component 300 provides a driving signal to the driving electrodes 301, so that two adjacent driving electrodes 301 form an electric field to drive the liquid crystal molecules 1051 of the liquid crystal layer 105 to rotate. Light emitted from the infrared light distance sensor may be emitted to the outside of the display screen 100 after being transmitted through the liquid crystal layer 105, and light reflected from the outside of the display screen 100 may be received by the infrared light distance sensor after being transmitted through the liquid crystal layer 105, so that external things, such as a distance between a user and the display screen, may be calculated by the time of emission and reception of light.

Similarly, if the photo sensor device 200 is an ambient light sensor, when the display panel 200 is in the touch screen, the driving signal line 301 of the photo sensing driving assembly 300 provides a driving signal to the driving electrodes 301, so that two adjacent driving electrodes 301 form an electric field to drive the liquid crystal molecules 1051 of the liquid crystal layer 105 to rotate. Light outside the display screen 100 may be received by the ambient light sensor after being transmitted through the liquid crystal layer 105.

Referring to fig. 6, fig. 6 is a schematic structural view of a photosensitive driving element disposed on a TFT substrate according to the present application. As shown in fig. 6, the TFT substrate includes a substrate 1020, a switching tube 1021, and a pixel electrode 1022. The switching tube 1021 and the pixel electrode 1022 are disposed on the substrate 1011, the control terminal 1024 of the switching tube 1021 is electrically connected to the scan line, the input terminal 1025 is electrically connected to the data line, and the output terminal 1026 is electrically connected to the pixel electrode 1022. The switch 1021 can be a MOS switch, the control terminal 1024 can be a base of the MOS switch, the input terminal 1025 can be a collector of the MOS switch, and the output terminal 1026 can be an emitter of the MOS switch.

The difference from the previous embodiment is: the photo driving element 300 is disposed on a side of the TFT substrate 1020 away from the switching tube 1021 and the pixel electrode 1022. The driving electrode 301 is disposed on the TFT substrate 1020, and the driving signal line 302 is disposed on the driving electrode 301 and electrically connected to the driving electrode 301. As shown in fig. 6, the driving signal line 302 and the driving electrode 301 are in direct contact with each other. In other embodiments, the driving electrode 301 and the driving signal line 302 may also be configured as described above, i.e. an insulating layer is disposed therebetween and electrically connected through a via hole on the insulating layer.

In order to prevent the light-sensitive driving element 300 from blocking the transmission of light, the present embodiment arranges the projection of the driving electrode 301 of the light-sensitive driving element 300 on the TFT substrate 1020 to overlap the position of the switching tube 1021. The projection of the driving signal line 302 on the TFT substrate 1020 may overlap with the position of the data line or the scan line.

While the light sensing driving element 300 is disposed on the CF substrate or the TFT substrate in the above embodiments, it should be understood that in other embodiments, the light sensing driving element 300 may also be disposed on the CF substrate or the TFT substrate, and the structure thereof may be similar to that of the foregoing description, and will not be described herein again.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a display device 700 according to an embodiment of the present disclosure. The display device 700 includes a display panel assembly 701 and a backlight module 702, the backlight module 702 provides backlight to the display panel of the display panel assembly 701, and the display panel assembly 701 includes the display panel assembly described above.

The application also provides a driving method of the display device. The display device is the display device 700 described above. Referring to fig. 8-9, fig. 8 is a flowchart illustrating a driving method of a display device, and fig. 9 is a waveform diagram of a driving signal corresponding to the driving method illustrated in fig. 8.

As shown in fig. 8, the driving method of the present embodiment includes the steps of:

step 801, the backlight module stops providing backlight for the display screen, the first substrate and the second substrate stop driving liquid crystal molecules in the liquid crystal layer to rotate, and the display screen is in a screen refreshing state.

Before step 801, the backlight module may further provide backlight to the display screen, and the first substrate 103 and the second substrate 104 drive the liquid crystal molecules 1051 in the liquid crystal layer 105 to rotate, so that the display screen 100 is in a bright screen state.

Specifically, the scan line S provides an on scan line signal to the control terminal of the switching tube 1021, the switching tube 1021 is turned on, and the data line D provides a data signal to the input terminal of the switching tube 1021 for outputting to the pixel electrode 1022. The pixel electrode 1022 cooperates with the common electrode on the CF substrate to form an electric field for rotating the liquid crystal molecules 1051 of the liquid crystal layer 105 after receiving the data signal. Therefore, the backlight provided by the backlight module can pass through the liquid crystal layer 105 and then exit for display. This state may be a bright screen state, i.e., a display state, of the display screen 100.

In step 801, the scan line S provides a scan line signal for turning off to the control end of the switching tube 1021, the switching tube 1021 is turned off, the data line D stops providing a data signal to the input end of the switching tube 1021, and the pixel electrode 1022 does not receive the data signal. So that there is no electric field between the CF substrate and the TFT substrate that can rotate the liquid crystal molecules 1051 of the liquid crystal layer 105. The liquid crystal molecules 1051 are in the original state, i.e., the off state, and block the transmission of light, thereby implementing the screen-off of the display screen 100. This state may be a non-display state of the display screen 100.

In step 802, the light sensing driving assembly drives the liquid crystal molecules in the liquid crystal layer to rotate, so that the light of the light sensing element can be transmitted in the liquid crystal layer.

In step 802, the driving signal line 302 of the photo sensing driving element 300 provides a driving signal to the driving electrode 301 to drive the liquid crystal molecules 1051 in the liquid crystal layer 105 to rotate. As shown in fig. 9, the potentials of the driving signals received by two adjacent driving electrodes 301 are opposite, so that the polarities of the two adjacent driving electrodes 301 are opposite. Thereby forming an electric field between the adjacent two drive electrodes 301 to drive the liquid crystal molecules 1051 in the liquid crystal layer 105 to rotate. The direction of the electric field formed between two adjacent driving electrodes 301 is perpendicular to the direction of the electric field formed between the first substrate 103 and the second substrate 104 described above.

The principle of the light sensing element transmitting in the liquid crystal layer is as described above, and is not described herein again.

Therefore, the liquid crystal molecules are driven to rotate when the display screen is in the screen-refreshing state, so that the light of the light sensing element can be transmitted in the liquid crystal layer, and the light sensing element can be arranged under the screen of the liquid crystal display device.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A display screen assembly is characterized by comprising a display screen, a light sensing element and a light sensing driving assembly;

the light sensation driving assembly is arranged on the first substrate and/or the second substrate and drives the liquid crystal molecules to rotate when the display screen is in a screen sensation state, so that light received by the light sensation element can be transmitted in the liquid crystal layer.

2. The display panel assembly of claim 1, wherein the light sensing driving assembly comprises a plurality of driving electrodes disposed at intervals and a plurality of driving signal lines disposed at intervals, the driving electrodes and the driving signal lines are in the same number and are in one-to-one correspondence, and the driving signal lines provide driving signals to the driving electrodes when the display panel is in a screen-off state.

3. The display screen assembly of claim 2, wherein adjacent drive electrodes receive drive signals of opposite potential such that adjacent drive electrodes have opposite polarity.

4. A display screen assembly according to claim 2 or 3, wherein the potentials of the drive signals at two adjacent transmission instants are opposite, such that the polarities of the drive electrodes at two adjacent transmission instants are opposite.

5. The display screen assembly of claim 2, wherein the first substrate is a CF substrate and the second substrate is a TFT substrate.

6. The display screen assembly of claim 5, wherein the CF substrate comprises:

a CF substrate;

the filter layer and the black matrix layer are arranged on the CF substrate;

the driving electrode of the light sensation driving assembly is arranged on the black matrix layer and corresponds to the light sensation element, and the driving signal line is arranged on the driving electrode and is electrically connected with the driving electrode.

7. The display screen assembly of claim 5, wherein the TFT substrate comprises:

a TFT substrate;

the switching tube and the pixel electrode are electrically connected and arranged on the TFT substrate;

the light sensation driving component is arranged on one side of the TFT substrate, which is far away from the switch tube and the pixel electrode, and the driving electrode of the light sensation driving component corresponds to the light sensation element.

8. The display screen assembly of claim 7, wherein a projection of the drive electrode on the TFT substrate overlaps a position of a switching tube.

9. A display device, comprising a display panel assembly including the display panel assembly of any one of claims 1-8 and a backlight module providing backlight to a display panel of the display panel assembly.

10. A driving method of a display device is characterized in that the display device comprises a display screen assembly and a backlight module, the display screen assembly comprises a display screen, a light sensation element and a light sensation driving assembly, the display screen comprises a first substrate, a second substrate and a liquid crystal layer, the display screen comprises a display area and a non-display area, the liquid crystal layer is arranged corresponding to the display area, and at least part of the light sensation element corresponds to the display area; the first substrate and the second substrate are oppositely arranged, the liquid crystal layer is arranged between the first substrate and the second substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules;

the driving method includes:

the backlight module stops providing backlight for the display screen, the first substrate and the second substrate stop driving liquid crystal molecules in the liquid crystal layer to rotate, and the display screen is in a screen refreshing state;

the light sensation driving component drives the liquid crystal molecules in the liquid crystal layer to rotate, so that light received by the light sensation element can be transmitted in the liquid crystal layer.

11. The driving method according to claim 10, further comprising:

the backlight module provides backlight for the display screen, the first substrate and the second substrate drive liquid crystal molecules in the liquid crystal layer to rotate, and the display screen is in a bright screen state.