CN111552109A

CN111552109A - Display module, driving method thereof and display device

Info

Publication number: CN111552109A
Application number: CN202010518562.0A
Authority: CN
Inventors: 马新利; 钱学强; 刘冰洋; 徐天宇; 陈东川; 李昌峰; 王凯旋; 王迎姿
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2020-08-18
Also published as: WO2021249310A1

Abstract

The invention provides a display module, a driving method thereof and a display device, and relates to the technical field of display. According to the invention, the optical modulation structure is arranged on the light incidence side of the display panel, when the texture recognition is carried out, the optical modulation structure receives incident light provided by the backlight module and converts the incident light at the target position into first polarized light, so that the first polarized light passes through the display panel and irradiates on an object to be detected, and the light reflected by the object to be detected is received to recognize the texture image of the object to be detected. Through increasing the optical modulation structure at the income light side of display panel, when carrying out the line discernment, make backlight unit provide incident light for only the incident light of target position department in the predetermined area can pass display panel and shine and wait to detect the object on, will stray light shielding, effectively reduce the invalid light intensity that the incident light that backlight unit provided produced when the various membrane base plate side takes place the total reflection, thereby can realize the line discernment.

Description

Display module, driving method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a display module, a driving method thereof and a display device.

Background

With the continuous development of display technology, display devices are widely used in life and work of people, and in the process of using the display devices, such as online shopping, payment and the like, the safety of the display devices has a great influence on the use experience of users.

At present, many display devices are used for improving the use safety of the display devices by arranging a line identification device on an array substrate, when line identification is carried out, light emitted by a backlight module passes through a lower polarizer, the array substrate, a liquid crystal layer and a color film substrate, and selective transmission is carried out at an upper polarizer, so that part of light of pixels irradiates an object to be detected through a display panel, and other parts of light do not penetrate through the display panel, the light irradiating the object to be detected can be reflected, and the reflected light irradiates the line identification device to carry out the line identification.

However, light emitted by the backlight module is absorbed by the lower polarizer, other light completely enters the liquid crystal box, light with an incident angle larger than a preset angle (for example, 42 °) incident on the color film substrate is totally reflected on the color film substrate side, and the totally reflected light irradiates the texture recognition device.

Disclosure of Invention

The invention provides a display module, a driving method thereof and a display device, which are used for solving the problem that the line identification device is easily saturated and cannot be subjected to line identification due to the fact that the light intensity of the light totally reflected to the line identification device is too high when the light totally reflected to a color film substrate is totally reflected.

In order to solve the above problems, the present invention discloses a display module, comprising: the display device comprises a display panel and an optical modulation structure arranged on the light incident side of the display panel, wherein the display panel comprises a line identification device;

the optical modulation structure is configured to receive incident light provided by the backlight module when texture recognition is performed, and convert the incident light at a target position in a preset area into first polarized light, so that the first polarized light passes through the display panel and irradiates an object to be detected on the light-emitting side of the display panel;

the line identification device is configured to receive the light reflected by the object to be detected so as to identify a line image of the object to be detected;

in a preset area, the incident light at other positions except the target position cannot enter the display panel.

Optionally, the optical modulation structure includes a first substrate and a second substrate that are disposed opposite to each other, a first electrode layer and a second electrode layer that are disposed between the first substrate and the second substrate, and a liquid crystal layer that is disposed between the first electrode layer and the second electrode layer, the optical modulation structure further includes a first polarizer that is disposed on a side of the first substrate away from the first electrode layer, and the first substrate is disposed on a side of the second substrate away from the display panel;

the first polarizer is configured to convert incident light provided by the backlight module into first linearly polarized light;

the first liquid crystal layer is configured to convert the first linear polarization at a target position within the preset region into the first polarized light under control of the first electrode layer and the second electrode layer.

Optionally, the first electrode layer includes a plurality of first electrodes distributed in an array, some or all of the first electrodes in the plurality of first electrodes have openings penetrating through the first electrodes, and the target position is a position where some or all of the openings are located;

the optical modulation structure further comprises driving transistors which correspond to the first electrodes one to one and are connected with each other.

Optionally, the first electrode layer includes a plurality of first electrodes distributed in an array, and the optical modulation structure further includes driving transistors corresponding to the first electrodes one to one and connected to each other.

Optionally, the first electrode layer is at least one first surface electrode, each first surface electrode has a plurality of openings penetrating through the first surface electrode, and the target position is a position where part or all of the openings are located.

Optionally, the aperture of each opening is 0.05mm to 0.5mm, and the distance between two adjacent openings is 0.3mm to 15 mm.

Optionally, the liquid crystal molecules of the first liquid crystal layer are any one of positive liquid crystal molecules, negative liquid crystal molecules and twisted nematic liquid crystal molecules.

Optionally, the display panel includes an array substrate and a color film substrate which are arranged oppositely, a second liquid crystal layer arranged between the array substrate and the color film substrate, a second polarizer arranged on one side of the array substrate far away from the second liquid crystal layer, and a third polarizer arranged on one side of the color film substrate far away from the second liquid crystal layer;

wherein the grain recognition device is disposed in the array substrate.

Optionally, the direction of the transmission axis of the first polarizer is consistent with that of the transmission axis of the third polarizer; and the transmission axis of the second polaroid is vertical to the transmission axis of the first polaroid and the transmission axis of the third polaroid.

Optionally, the number of the target positions in the preset area is multiple, and the multiple target positions are distributed in a matrix or a mosaic array.

Optionally, the display module further includes an identification module for the object to be detected;

the object identification module to be detected is configured to identify a contact area of the object to be detected and the display panel so as to determine a designated area where the target position is located;

the object identification module to be detected is a touch functional layer.

In order to solve the above problem, the present invention further discloses a driving method of a display module, which is applied to driving the display module, and the driving method includes:

when the lines are identified, controlling an optical modulation structure to convert incident light provided by a backlight module at a target position in a preset area into first polarized light, so that the first polarized light passes through a display panel and irradiates an object to be detected on the light-emitting side of the display panel;

and identifying the grain image of the object to be detected according to the light reflected by the object to be detected.

Optionally, when the first electrode layer in the optical modulation structure includes a plurality of first electrodes distributed in an array, and the optical modulation structure further includes driving transistors corresponding to the first electrodes one to one and connected to each other, when performing texture recognition, the step of controlling the optical modulation structure to convert incident light provided by the backlight module at a target position in a preset region into first polarized light includes:

when the line identification is carried out, the incident light at each target position is sequentially controlled to be converted into first polarized light based on the first electrode connected with each driving transistor.

In order to solve the above problem, the present invention further discloses a display device, which includes a backlight module and the display module, wherein the backlight module is disposed on a side of the optical modulation structure away from the display panel.

Compared with the prior art, the invention has the following advantages:

in the embodiment of the invention, the optical modulation structure is arranged on the light inlet side of the display panel, when the texture recognition is carried out, the optical modulation structure receives incident light provided by the backlight module and converts the incident light at the target position in the preset area into first polarized light, so that the first polarized light passes through the display panel and irradiates on an object to be detected positioned on the light outlet side of the display panel, the incident light at other positions except the target position in the preset area cannot enter the display panel, and the light reflected by the object to be detected is received through the texture recognition device in the display panel so as to recognize the texture image of the object to be detected. Through the light incidence side at display panel increases optical modulation structure, when carrying out line discernment, make the incident light that backlight unit provided, only the incident light of target location department in the predetermined area can get into inside the liquid crystal box and pass display panel and shine and wait to detect the object on, in order to carry out line discernment, will not need and cause the stray light of noise to shield through optical modulation structure easily, therefore, can effectively reduce the invalid light intensity that the incident light that backlight unit provided produced when the various membrane base plate side takes place the total reflection, avoid the condition that line discernment device appears the saturated condition, thereby can realize line discernment.

Drawings

Fig. 1 is a schematic structural diagram of a display module according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a first electrode layer according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a second first electrode layer according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a third first electrode layer according to an embodiment of the invention;

FIG. 5 is a schematic structural diagram of a fourth first electrode layer according to an embodiment of the invention;

FIG. 6 is a schematic diagram illustrating a position of a texture recognition position on a display panel according to an embodiment of the invention;

FIG. 7 shows a cross-sectional view along section A-A' shown in FIG. 6;

FIG. 8 is a schematic plan view of a display panel according to an embodiment of the present invention;

FIG. 9 shows a cross-sectional view along section B-B' shown in FIG. 8;

FIG. 10 shows a cross-sectional view along section C-C' shown in FIG. 8;

FIG. 11 is a schematic structural diagram of another display module;

FIG. 12 is a flowchart illustrating a driving method of a display module according to an embodiment of the present invention;

fig. 13 is a schematic structural view showing a display device according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a backlight module according to an embodiment of the invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

Referring to fig. 1, a schematic structural diagram of a display module according to an embodiment of the present invention is shown.

The embodiment of the invention provides a display module, which comprises: the display device comprises a display panel 10 and an optical modulation structure 20 arranged on the light incident side of the display panel 10, wherein the display panel 10 comprises a texture recognition device 111; the optical modulation structure 20 is configured to receive incident light provided by the backlight module when performing texture recognition, and convert the incident light at a target position in a preset region into first polarized light, so that the first polarized light passes through the display panel 10 and irradiates on an object to be detected 30 located on a light-emitting side of the display panel 10; a grain recognition device 111 configured to receive light reflected by the object 30 to be detected to recognize a grain image of the object 30 to be detected; wherein, in the preset area, the incident light at the other positions except the target position cannot enter the inside of the display panel 10.

It is noted that the target positions are distributed only within the preset area.

In the embodiment of the present invention, when performing texture recognition, the backlight module serves as a surface light source to provide incident light to the optical modulation structure 20, and the incident light provided by the backlight module is natural light, and the incident light uniformly irradiates onto the optical modulation structure 20, the optical modulation structure 20 receives the incident light provided by the backlight module and converts the incident light at the target position in the preset region into first polarized light, so that the first polarized light at the target position in the preset region can be incident into the liquid crystal box of the display panel 10 and can penetrate through the display panel 10 to irradiate onto the object 30 to be detected, and in the preset region, the incident light at other positions except the target position cannot enter into the liquid crystal box of the display panel 10, the first polarized light irradiated onto the object 30 to be detected is reflected on the surface of the object 30 to be detected, and the reflected light can irradiate onto the texture recognition device 111 in the display panel 10, the grain recognition device 111 receives the light reflected by the object 30 to be detected, and recognizes the grain image of the object 30 to be detected according to the light reflected by the object 30 to be detected.

It should be noted that the preset area in the embodiment of the present invention may be an area where the whole display panel 10 is located, and the target positions are distributed in the area where the whole display panel 10 is located.

The preset region in the embodiment of the present invention may also be a designated region, where the designated region is defined as a region smaller than the region where the display panel 10 is located, is included in the region where the display panel 10 is located, and may be disposed at any position in the region where the display panel 10 is located, and the shape and size of the preset region may also be adjusted according to actual needs. The designated area may be a fixed position area, or the position of the designated area may be selected according to the situation at each time of texture recognition. The grain recognition function can be realized in the designated area, and the target positions are distributed in the designated area.

When the target positions are distributed in the designated area, the display effect of the display panel 10 may be improved, compared to the target positions distributed in the entire area where the display panel 10 is located, because if the target positions are distributed in the entire area where the display panel 10 is located, when the texture recognition is performed, the light-transmitting position of the entire display panel 10 is the target position, so that the display brightness of the entire display panel 10 is greatly reduced, and after the texture recognition, the display brightness of the display panel 10 is recovered to normal, thereby causing the display panel 10 to flicker during the texture recognition, and when the target positions are set in the designated area, only the incident light at the positions other than the target position in the designated area cannot enter the display panel 10, and the incident light at the positions other than the designated area and the target position is converted into the first polarized light, so that the first polarized light passes through the display panel 10, therefore, while the grain recognition is ensured, the display brightness at a position other than the specified region is normal. In addition, although light at a position outside the designated area may pass through the display panel 10, the light may be designed to be distant from the target position with little influence on the saturation of the texture recognition device.

Preferably, the designated area may be set to be approximately equal to a contact area of the object 30 to be detected with the display panel 10. Here, the approximation may be understood that the designated area is slightly larger or smaller than the contact area of the object 30 to be detected and the display panel 10, as long as the normal grain recognition function is achieved. This kind of setting can be when the line detects the accurate designated area that divides, when guaranteeing the line discernment, makes the display brightness of the position department outside the designated area normal, further promotes the display effect.

Further preferably, the display module further includes an object identification module to be detected, and the object identification module to be detected is configured to identify a contact area between the object to be detected and the display panel 10, so as to determine a designated area where the target position is located; the object identification module to be detected is a touch functional layer.

The object identification module to be detected is arranged in the display module and used for identifying the contact area of the object 30 to be detected and the display panel 10, so that the specified area can be accurately positioned and divided, and the target position can be further determined.

Specifically, the optical modulation structure 20 may convert incident light at other positions except for the target position in the predetermined area into second polarized light, and the second polarized light cannot be incident into the liquid crystal cell of the display panel 10 and passes through the display panel 10.

Stray light which is not needed and is easy to cause noise is shielded through the optical modulation structure 20, only the first polarized light at the target position can enter the liquid crystal box of the display panel 10 in the preset area to realize line identification, even if the first polarized light at the target position is totally reflected on the color film substrate side, the intensity of light totally reflected to the line identification device 111 is weak, therefore, invalid light intensity generated when incident light provided by the backlight module is totally reflected on the color film substrate side can be effectively reduced, the situation that the line identification device 111 is in a saturated state is avoided, and line identification can be realized.

It can be understood that, during the texture recognition, the incident light provided by the backlight module is a surface light source, and the light entering the liquid crystal box in the prior art is still a surface light source, but in the embodiment of the present invention, through the optical modulation structure 20, in the preset region, only the incident light at the target position enters the liquid crystal box, that is, in the preset region, the surface light source of the backlight module is converted into a point light source, and the position of the point light source is also the target position.

The texture recognition device 111 may be a fingerprint recognition device or a palm recognition device, and correspondingly, the object 30 to be detected is a finger or a palm, and the texture image is a fingerprint image or a palm image.

For example, if the texture recognition device 111 is a fingerprint recognition device, the object 30 to be detected is a finger, and the texture image is a fingerprint image, because the fingerprint of the finger has a fingerprint valley and a fingerprint ridge, when the first polarized light at the target position passes through the display panel 10 and irradiates the fingerprint of the finger, the reflection degrees at the fingerprint valley and the fingerprint ridge are different, so that the light with different light intensities is reflected back to the texture recognition device 111 by the fingerprint valley and the fingerprint ridge, and the light reflected back by the fingerprint valley and the fingerprint ridge is converted into an electrical signal by the texture recognition device 111, thereby generating the fingerprint image. Correspondingly, the recognition principle of the palm print image is similar to that of the fingerprint image, and is not repeated herein.

Further, the optical modulation structure 20 includes a first substrate 21 and a second substrate 22 disposed opposite to each other, a first electrode layer 23 and a second electrode layer 24 disposed between the first substrate 21 and the second substrate 22, and a liquid crystal layer 25 disposed between the first electrode layer 23 and the second electrode layer 24, the optical modulation structure 20 further includes a first polarizer 26 disposed on a side of the first substrate 21 away from the first electrode layer 23, the first substrate 21 is disposed on a side of the second substrate 22 away from the display panel 10; a first polarizer 26 configured to convert incident light provided from the backlight module into a first linearly polarized light; and a first liquid crystal layer 25 configured to convert the first linear polarization at the target position within the preset region into the first polarized light under the control of the first electrode layer 23 and the second electrode layer 24.

In the embodiment of the present invention, the first substrate 21 and the second substrate 22 may be glass substrates, the first electrode layer 23 and the second electrode layer 24 are made of a transparent conductive material, such as ITO (Indium Tin Oxide) or IZO (Indium zinc Oxide), and the second electrode layer 24 is a surface electrode.

As shown in fig. 1, the first electrode layer 23 is disposed on the first substrate 21 side close to the second substrate 22, and the second electrode layer 24 is disposed on the second substrate 22 side close to the first substrate 21.

At this time, the incident light provided by the backlight module is changed into a first linearly polarized light through the first polarizer 26 in the optical modulation structure 20, the first linearly polarized light sequentially passes through the first substrate 21 and the first electrode layer 23 and irradiates the first liquid crystal layer 25, and when the texture recognition is performed, a certain voltage is applied to the first electrode layer 23 and the second electrode layer 24, so that the first linearly polarized light at the target position in the preset region is converted into a first polarized light, and the light at the other positions except the target position in the preset region is still the first linearly polarized light. The first polarized light may enter the liquid crystal cell of the display panel 10, and the first linearly polarized light may not enter the liquid crystal cell of the display panel 10.

The positions of the first electrode layer 23 and the second electrode layer 24 may be interchanged, that is, the second electrode layer 24 is disposed on the first substrate 21 side closer to the second substrate 22, and the first electrode layer 23 is disposed on the second substrate 22 side closer to the first substrate 21.

As shown in fig. 2, the first electrode layer 23 includes a plurality of first electrodes 231 distributed in an array, some or all of the first electrodes 231 in the plurality of first electrodes 231 have openings 232 penetrating through the first electrodes 231, and the target position is a position where some or all of the openings 232 are located; the optical modulation structure 20 further includes driving transistors 27 in one-to-one correspondence with the first electrodes 231 and connected to each other.

In addition, the optical modulation structure 20 further includes a plurality of gate lines 41 distributed along the row direction and a plurality of data lines 42 distributed along the column direction, each gate line 41 is connected to the gate of a corresponding driving transistor 27, each data line 42 is connected to the source of a corresponding driving transistor 27, and the drain of the driving transistor 27 is connected to the first electrode 231; all the gate lines 41 are connected to a gate driving chip 43, and all the data lines 42 are connected to a source driving chip 44.

In the first electrode layer 23 shown in fig. 2, the liquid crystal molecules of the corresponding first liquid crystal layer 25 may be positive liquid crystal molecules or twisted nematic liquid crystal molecules.

Taking the liquid crystal molecules of the first liquid crystal layer 25 as positive liquid crystal molecules as an example, when texture recognition is detected to be required, in a preset region, the gate driving chip 43 provides a gate signal to each gate line 41 to turn on each driving transistor 27, and at the same time, the source driving chip 44 provides a data signal to each data line 42, so as to provide the first voltage to the first electrode 231. In the preset region, since the first electrode 231 is not located at the position corresponding to the opening 232, the liquid crystal molecules at the position corresponding to the opening 232 in the preset region are not applied with a voltage, so that the liquid crystal molecules at the position corresponding to the opening 232 in the preset region are not deflected, the first linearly polarized light at the position corresponding to the opening 232 in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light, the elliptically polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal box of the display panel 10, that is, the light at the position corresponding to the opening 232 in the preset region can enter the liquid crystal box of the display panel 10; the first electrode 231 is disposed at a position except the opening 232 in the predetermined area, a first voltage is applied to the first electrode 231 through the driving transistor 27, a voltage applied to the second electrode layer 24 is a second voltage, and a certain voltage difference exists between the first voltage and the second voltage, so that the liquid crystal molecules at the position corresponding to the first electrode 231 are deflected under the voltages applied to the first electrode 231 and the second electrode layer 24, and the liquid crystal molecules at the position corresponding to the first electrode 231 are arranged in a direction perpendicular to the first substrate 21, so that the first line of the predetermined area at the position except the position corresponding to the opening 232 passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization is unchanged and still is a first line of the predetermined area, and the first line of the predetermined area cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22, that is, light rays at other positions except the position corresponding to the opening 232 in the predetermined region cannot enter the liquid crystal cell of the display panel 10.

Taking the liquid crystal molecules of the first liquid crystal layer 25 as twisted nematic liquid crystal molecules as an example, when it is detected that texture recognition is required, in a preset region, the gate driving chip 43 provides a gate signal to each gate line 41 to turn on each driving transistor 27, and at the same time, the source driving chip 44 provides a data signal to each data line 42, thereby providing a first voltage to the first electrode 231. Because the first electrode 231 is not located at the position corresponding to the opening 232 in the preset region, the liquid crystal molecules at the position corresponding to the opening 232 in the preset region are not applied with a voltage, so the liquid crystal molecules at the position corresponding to the opening 232 in the preset region are in a twisted state, the first linearly polarized light at the position corresponding to the opening 232 in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then rotates by 90 ° to become the second linearly polarized light, the second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal box of the display panel 10, that is, the light at the position corresponding to the opening 232 in the preset region can enter the liquid crystal box of the display panel 10; and the first electrode 231 is disposed at a position other than the opening 232 within the predetermined region, a first voltage is applied to the first electrode 231 through the driving transistor 27, and the voltage applied by the second electrode layer 24 is a second voltage, there is a certain voltage difference between the first voltage and the second voltage, the liquid crystal molecules at the position corresponding to the first electrode 231 are aligned in the direction perpendicular to the first substrate 21 under the voltage applied by the first electrode 231 and the second electrode layer 24, so that the first linear polarization at the positions except the position corresponding to the opening 232 in the predetermined region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25, the polarization property is not changed, and still is the first line polarization, the first line polarization cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22, that is, light rays at other positions except the position corresponding to the opening 232 in the predetermined region cannot enter the liquid crystal cell of the display panel 10.

It should be noted that, the voltage applied to the second electrode layer 24 is 0V, and the data signal provided to the source of the driving transistor 27 by the source driving chip 44 controls the voltage difference between the first electrode 231 and the second electrode layer 24, and for the first electrode layer 23 shown in fig. 2, when the liquid crystal molecules of the corresponding first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, the voltage difference between the voltages applied to the first electrode 231 and the second electrode layer 24 may be 3 to 10V, that is, the voltage applied to the first electrode 231 is 3 to 10V, so that the light at the positions other than the position corresponding to the opening 232 in the preset region cannot enter the liquid crystal cell of the display panel 10.

In fig. 2, when the preset area is a designated area with a fixed position, the driving transistor 27 provides a voltage signal with the same voltage value as that of the second electrode layer 24 to the corresponding first electrode 231 for a position outside the designated area, so that the first linearly polarized light at the position outside the designated area passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence and then becomes elliptically polarized light or second linearly polarized light, and the elliptically polarized light or the second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10.

It should be noted that, when the preset area is the area where the whole display panel 10 is located, the target position is the position where all the openings are located at 232; when the preset region is the designated region, the target position is the position of the partial opening 232, when the texture recognition is performed, in the designated region, only the light at the position corresponding to the opening 232 can enter the liquid crystal box of the display panel 10, and the light at the other positions except the opening 232 in the designated region cannot enter the liquid crystal box of the display panel 10.

When performing texture recognition, when the preset region is the region where the whole display panel 10 is located, the target position may be the position where all the openings are located at 232. When performing texture recognition, light at the target position may enter the liquid crystal cell of the display panel 10, and light at a position of the first electrode 231 other than the target position cannot enter the liquid crystal cell of the display panel 10. The structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the line identification device is in a saturated state is avoided, so that the line identification can be realized.

When the predetermined area is the designated area, the target position is the position of the opening 232 in the designated area. When performing texture recognition, the light at the target position in the designated area may enter the liquid crystal cell of the display panel 10, and the light at the position other than the target position in the designated area may not enter the liquid crystal cell of the display panel 10. In the designated area, the structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the grain identification device is in a saturated state is avoided, so that the grain identification can be realized. And the light rays at the position outside the designated area normally enter the display panel to be displayed normally. But the influence of the light rays at the position outside the specified area on the saturation of the texture recognition device in the specified area is small, so that the effective recognition of the texture can be realized while normal display is realized.

As shown in fig. 3, the first electrode layer 23 includes a plurality of first electrodes 231 distributed in an array, and the optical modulation structure 20 further includes driving transistors 27 corresponding to the first electrodes 231 one by one and connected to each other.

The first electrode layer 23 shown in fig. 3 is different from the first electrode layer 23 shown in fig. 2 in that some or all of the first electrodes 231 shown in fig. 2 have openings 232 penetrating the first electrodes 231, while all of the first electrodes 231 shown in fig. 3 have no openings.

In fig. 3, the optical modulation structure 20 further includes a plurality of gate lines 41 distributed along the row direction and a plurality of data lines 42 distributed along the column direction, each gate line 41 is connected to the gate of a corresponding driving transistor 27, each data line 42 is connected to the source of a corresponding driving transistor 27, and the drain of the driving transistor 27 is connected to the first electrode 231; all the gate lines 41 are connected to a gate driving chip 43, and all the data lines 42 are connected to a source driving chip 44.

In the first electrode layer 23 shown in fig. 3, the liquid crystal molecules of the corresponding first liquid crystal layer 25 may be any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules.

If the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules, a voltage signal with the same voltage value as that of the second electrode layer 24 is provided to the first electrode 231 at the target position in the preset region through the driving transistor 27, the liquid crystal molecules at the target position in the preset region are not deflected, the first linearly polarized light at the target position in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then is changed into elliptically polarized light, and the elliptically polarized light can enter the liquid crystal box of the display panel 10 through the second electrode layer 24 and the second substrate 22; the first electrodes 231 at the positions other than the target position in the preset region provide voltage signals with different voltage values from the second electrode layer 24, so that the liquid crystal molecules at the positions other than the target position in the preset region are deflected, the first linearly polarized light at the positions other than the target position in the preset region passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization property of the first linearly polarized light is unchanged and still is the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cells of the display panel 10 through the second electrode layer 24 and the second substrate 22.

If the liquid crystal molecules of the first liquid crystal layer 25 are negative liquid crystal molecules, a voltage signal with a voltage value different from that of the second electrode layer 24 is provided to the first electrode 231 at the target position in the preset region through the driving transistor 27, the liquid crystal molecules at the target position in the preset region are deflected, first linearly polarized light at the target position in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then is changed into elliptically polarized light, and the elliptically polarized light can enter the liquid crystal box of the display panel 10 through the second electrode layer 24 and the second substrate 22; the first electrodes 231 at the positions other than the target position in the preset region provide voltage signals with the same voltage value as the second electrode layer 24, so that the liquid crystal molecules at the positions other than the target position in the preset region are not deflected, the liquid crystal molecules at the positions other than the target position in the preset region are arranged along the direction perpendicular to the first substrate 21, the first linearly polarized light at the positions other than the target position in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25, the polarization of the first linearly polarized light is unchanged and still is the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22.

If the liquid crystal molecules of the first liquid crystal layer 25 are twisted nematic liquid crystal molecules, a voltage signal having the same voltage value as that of the second electrode layer is provided to the first electrode 231 at the target position in the preset region through the driving transistor 27, so that the liquid crystal molecules at the target position in the preset region are in a twisted state, the first linearly polarized light at the target position in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then rotates by 90 ° to become a second linearly polarized light, and the second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10; the first electrodes 231 at the positions except the target position in the preset region provide voltage signals with different voltage values from the second electrode layer 24, so that the liquid crystal molecules at the positions except the target position in the preset region are arranged along the direction perpendicular to the first substrate 21, the first linearly polarized light at the positions except the target position in the preset region passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization of the first linearly polarized light is unchanged and still is the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22.

In fig. 3, when the predetermined area is a designated area with a fixed position, the voltage signal provided to the corresponding first electrode 231 through the driving transistor 27 for the position outside the designated area is consistent with the voltage signal provided at the target position, that is, the positive liquid crystal molecules and the twisted nematic liquid crystal molecules, the voltage signal with the same voltage value as the second electrode layer 24 is provided for the first electrode 231 at the position outside the designated area, and the voltage signal with the different voltage value from the second electrode layer 24 is provided for the negative liquid crystal molecules and is provided for the first electrode 231 at the position outside the designated area, so that the first linear polarization at the position outside the designated area sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then becomes elliptically polarized light or second linearly polarized light, which can pass through the second electrode layer 24 and the second substrate 22, into the liquid crystal cell of the display panel 10.

When texture recognition is performed, when the preset region is the region where the whole display panel 10 is located, the target positions may be positions where a part of the first electrodes 231 are located, and the target positions may be evenly distributed in the region where the whole display panel 10 is located, and different target positions are spaced from each other by using the remaining first electrodes 231 except for the part of the first electrodes 231. When performing texture recognition, light at the target position may enter the liquid crystal cell of the display panel 10, and light at the position where the remaining first electrode 231 is located may not enter the liquid crystal cell of the display panel 10. The structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the line identification device is in a saturated state is avoided, so that the line identification can be realized.

When the preset area is the designated area, the target positions are positions of a part of the first electrodes 231 in the designated area, and the target positions may be evenly distributed in the designated area, and different target positions are spaced from each other by using the remaining first electrodes 231 except for the part of the first electrodes 231. When performing texture recognition, light at the position where part of the first electrode 231 in the designated area is located may enter the liquid crystal cell of the display panel 10, and light at the position where the remaining first electrode 231 in the designated area is located may not enter the liquid crystal cell of the display panel 10. In the designated area, the structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the grain identification device is in a saturated state is avoided, so that the grain identification can be realized. And the light rays at the position outside the designated area normally enter the display panel to be displayed normally. But the influence of the light rays at the position outside the specified area on the saturation of the texture recognition device in the specified area is small, so that the effective recognition of the texture can be realized while normal display is realized.

As shown in fig. 4 and 5, the first electrode layer 23 is at least one first surface electrode, each first surface electrode has a plurality of openings 232 penetrating through the first surface electrode, and the target position is a position where part or all of the openings 232 are located.

With respect to the first electrode layer 23 shown in fig. 4 and 5, it is not necessary to provide a driving transistor, a gate line, a data line, and the like on the optical modulation structure 20, and the voltage applied to the first electrode layer 23 is controlled only by a clock signal, and the liquid crystal molecules of the corresponding first liquid crystal layer 25 may be positive liquid crystal molecules or twisted nematic liquid crystal molecules.

If the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules, voltage signals with different voltage values from those of the second electrode layer 24 are provided for the first surface electrodes in the preset region, and because the first surface electrodes are not arranged at the positions corresponding to the openings 232 in the preset region, the first linearly polarized light at the positions corresponding to the openings 232 in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then is changed into elliptically polarized light, and the elliptically polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal box of the display panel 10; after the first linearly polarized light at the other positions in the preset area except the position corresponding to the opening 232 passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization property is not changed, and the first linearly polarized light still remains as the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22.

If the liquid crystal molecules of the first liquid crystal layer 25 are twisted nematic liquid crystal molecules, a voltage signal providing a voltage value different from that of the second electrode layer 24 is applied to the first surface electrode in the preset region, and since there is no first surface electrode at the position corresponding to the opening 232 in the preset region, the first linearly polarized light at the position corresponding to the opening 232 in the preset region sequentially passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 and then is changed into a second linearly polarized light, and the second linearly polarized light can pass through the second electrode layer 24 and the second substrate 22 and enter the liquid crystal cell of the display panel 10; after the first linearly polarized light at the other positions in the preset area except the position corresponding to the opening 232 passes through the first substrate 21, the first electrode layer 23 and the first liquid crystal layer 25 in sequence, the polarization property is not changed, and the first linearly polarized light still remains as the first linearly polarized light, and the first linearly polarized light cannot enter the liquid crystal cell of the display panel 10 through the second electrode layer 24 and the second substrate 22.

When the predetermined area is the area where the entire display panel 10 is located, the area where the first surface electrode is located includes the area where the entire display panel 10 is located. When performing texture recognition, the light of the opening 232 may enter the liquid crystal cell of the display panel 10, and the light at the first electrode cannot enter the liquid crystal cell of the display panel 10. The structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the line identification device is in a saturated state is avoided, so that the line identification can be realized.

When the preset area is a designated area with a fixed position, the first surface electrode is located in the whole designated area, and the target position is the position of all the openings 232 on the first surface electrode. Light at the position of the opening 232 in the designated area can enter the liquid crystal cell of the display panel 10, and light at other positions in the designated area cannot enter the liquid crystal cell of the display panel 10. In the designated area, the structure design can effectively reduce the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate, and the condition that the grain identification device is in a saturated state is avoided, so that the grain identification can be realized. And the light rays at the position outside the designated area normally enter the display panel to be displayed normally. But the influence of the light rays at the position outside the specified area on the saturation of the texture recognition device in the specified area is small, so that the effective recognition of the texture can be realized while normal display is realized.

It is understood that, in the designated area of the fixed position, the first surface electrode may be provided in plurality, and the voltage signal provided by each first surface electrode is the same when the texture recognition is performed.

It is understood that a plurality of first plane electrodes may be distributed in an area where the entire display panel 10 is located. After the designated area is determined, a voltage signal providing a voltage value different from that of the second electrode layer 24 is applied to the first surface electrode in the designated area, and a voltage signal providing the same voltage value as that of the second electrode layer 24 is applied to the first surface electrode at a corresponding position outside the designated area. According to the principle similar to the principle, the effective identification of the lines can be realized while the normal display is realized.

As described above, the liquid crystal molecules of the first liquid crystal layer 25 are any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules, and the corresponding first polarized light is elliptically polarized light or second linearly polarized light.

In the embodiment of the invention, the number of the target positions in the preset area is multiple, and the multiple target positions are distributed in a matrix or mosaic array.

For the first electrode layer 23 shown in fig. 2, 4 and 5, the target position is the position of the opening 232 in the predetermined area, and for the first electrode layer 23 shown in fig. 3, the target position is the position of the first electrode 231 corresponding to the first linear polarization converted into the first polarized light in the predetermined area.

As shown in fig. 4, the plurality of target positions are distributed in a mosaic array, that is, the target positions in odd-numbered rows are aligned along the column direction, the target positions in even-numbered rows are also aligned along the column direction, and the target positions in two adjacent rows are staggered along the column direction; as shown in fig. 5, the plurality of target positions are distributed in a matrix, that is, the target positions of any two adjacent rows are aligned along the column direction.

It should be understood that fig. 4 and 5 only show the distribution of the target positions when the first electrode layer 23 is the first surface electrode, and the distribution of the corresponding target positions of the first electrode layer 23 shown in fig. 2 and 3 may also be a matrix distribution or a mosaic array distribution. It is to be understood that fig. 2 shows a case where only one opening 232 is provided for the first electrode 231, and a plurality of openings 232 may be provided for each of the first electrodes 231 shown in fig. 2. The plurality of openings 232 may be distributed in a matrix or mosaic array.

In addition, the first electrode layer 23 shown in fig. 4 and 5 includes only one first surface electrode, and in fact, the first electrode layer 23 may further include a plurality of first surface electrodes insulated from each other, and each of the first surface electrodes has an opening 232 as shown in fig. 4 or 5.

Preferably, in fig. 2, 4 and 5, the aperture d1 of the opening 232 is 0.05mm to 0.5mm, and the distance d2 between two adjacent openings 232 is 0.3mm to 15 mm.

The opening 232 on the first electrode 231 or the opening 232 on the first surface electrode may be used to form a point light source entering the display panel 10 for texture recognition, in order to reduce interference between adjacent point light sources, the aperture d1 of the opening 232 may be set to 0.05mm to 0.5mm, and the separation distance d2 between two adjacent openings 232 may be set to 0.3mm to 15mm, and when the separation distance d2 between two adjacent openings 232 is larger, the interference between two adjacent point light sources is smaller.

With reference to fig. 2, when a plurality of openings 232 are provided for each first electrode 231, the aperture d1 of the opening 232 may also be set to be 0.05mm to 0.5mm, and the spacing distance d2 between two adjacent openings 232 is set to be 0.3mm to 15 mm.

Note that the shape of the orthographic projection of the opening 232 on the first substrate 21 is not limited to the rectangle shown in fig. 2, 4, and 5, and may be a circle. If the orthographic projection of the opening 232 on the first substrate 21 is rectangular, the aperture d1 of the opening 232 refers to the length or width of the rectangle, and if the orthographic projection of the opening 232 on the first substrate 21 is circular, the aperture d1 of the opening 232 refers to the diameter of the circle. Further, the separation distance d2 of the two openings 232 refers to a straight line distance between the center positions of the two openings 232.

In the embodiment of the present invention, when normal display is required, that is, when texture recognition is not required, the incident light provided by the backlight module is still a surface light source, and the optical modulation structure 20 converts all the incident light at all positions into the first polarized light, so that the light entering the display panel 10 is also a surface light source.

When normal display is required, for the first electrode layer 23 shown in fig. 2, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, voltage signals with the same voltage value as that of the second electrode layer 24 need to be provided to all the first electrodes 231; for the first electrode layer 23 shown in fig. 3, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, voltage signals with the same voltage value as that of the second electrode layer 24 need to be provided to all the first electrodes 231, and if the liquid crystal molecules of the first liquid crystal layer 25 are negative liquid crystal molecules, voltage signals with different voltage values from that of the second electrode layer 24 need to be provided to all the first electrodes 231; in the first electrode layer 23 shown in fig. 4 and 5, if the liquid crystal molecules of the first liquid crystal layer 25 are positive liquid crystal molecules or twisted nematic liquid crystal molecules, it is necessary to provide voltage signals having the same voltage value as that of the second electrode layer 24 to all the first surface electrodes.

In the embodiment of the present invention, as shown in fig. 1, the display panel 10 includes an array substrate 11 and a color filter substrate 12 that are oppositely disposed, a second liquid crystal layer 13 disposed between the array substrate 11 and the color filter substrate 12, a second polarizer 14 disposed on a side of the array substrate 11 away from the second liquid crystal layer 13, and a third polarizer 15 disposed on a side of the color filter substrate 12 away from the second liquid crystal layer 13; wherein the grain recognition device 111 is provided in the array substrate 11.

The array substrate 11 includes a third substrate 112 and a texture recognition device 111 disposed on a side of the third substrate 112 close to the second liquid crystal layer 13, the color filter substrate 12 includes a fourth substrate 121, and a color set unit 122 (not shown in fig. 1, specifically, see fig. 9) and a black matrix 123 disposed on a side of the fourth substrate 121 close to the second liquid crystal layer 13, the color set unit 122 includes a red color set unit, a blue color set unit, a green color set unit, and the like, and the black matrix 123 is disposed between two adjacent color set units 122.

In addition, the grain recognition device 111 may be further disposed on a side of the fourth substrate 121 close to the second liquid crystal layer 13 or a side away from the second liquid crystal layer 13. When the grain identifying device 111 is disposed on the fourth substrate 121 on the side close to the second liquid crystal layer 13, it is closer to the fourth substrate 121 than the black matrix 123, and the orthographic projection on the fourth substrate 121 is located inside the orthographic projection of the black matrix 123 on the fourth substrate 121. The grain identification device 111 may also be provided on the side of the fourth substrate 121 remote from the second liquid crystal layer 13, in which case the orthographic projection of the grain identification device 111 on the fourth substrate 121 is located inside the orthographic projection of the black matrix 123 on the fourth substrate 121. The two arrangements described in this paragraph do not occupy the space of the color film and do not affect the aperture opening ratio of the display module.

Wherein, the direction of the transmission axis of the first polarizer 26 is consistent with that of the transmission axis of the third polarizer 15; the transmission axis of the second polarizer 14 is perpendicular to both the transmission axis of the first polarizer 26 and the transmission axis of the third polarizer 15.

In the embodiment of the present invention, the first polarized light at the target position is elliptically polarized light or second linearly polarized light, and the second linearly polarized light is rotated by 90 ° relative to the first linearly polarized light, because the first linearly polarized light is a light ray of the incident light provided by the backlight module after passing through the first polarizer 26, and the direction of the transmission axis of the second polarizer 14 is perpendicular to the direction of the transmission axis of the first polarizer 26, the second linearly polarized light can normally pass through the second polarizer 14 and enter the display panel 10, and the first linearly polarized light cannot normally pass through the second polarizer 14 and enter the display panel 10. And the direction of the transmission axis of the second polarizer 14 is controlled to be perpendicular to the transmission axis of the third polarizer 15, so as to control the normal display of the display panel 10.

The above description is directed to the optical modulation structures 20 distributed in the whole area of the display panel 10, and of course, the optical modulation structures 20 of the embodiment of the present invention may be disposed only in a specific area of the fixed position, and the optical modulation structures 20 are not disposed in other areas.

As shown in fig. 6 and 7, a1 is a grain recognition position of the display panel 10, and is a designated area of a fixed position. At this time, the texture recognition device 111 is only disposed at the texture recognition position a1, the optical modulation structure 20 is disposed in the region corresponding to the texture recognition position a1, and in the region where the display panel 10 is disposed, the first electrode layer 23 and the second electrode layer 24 are not connected to a wire and cannot be applied with a voltage, or the first electrode layer 23 and the second electrode layer 24 are not disposed except the region corresponding to the texture recognition position a 1. The structure of the other region except the region corresponding to the grain identification position a1 can make the light provided by the backlight module normally pass through and enter the display panel 10 no matter when the grain is identified or when the display is normally displayed. Since the first liquid crystal layer 25 exists in the optical modulation structure 20, the first liquid crystal layer 25 needs to be encapsulated by the sealant at the edge of the region corresponding to the texture recognition position a 1.

Referring to fig. 8, a plan view schematically showing a display panel according to an embodiment of the present invention, fig. 9 shows a sectional view taken along a section B-B 'shown in fig. 8, and fig. 10 shows a sectional view taken along a section C-C' shown in fig. 8.

A first thin film transistor 113a and a second thin film transistor 113b are further provided in the array substrate 11, a gate line 16 connected to a gate electrode of the first thin film transistor 113a, and a scan line 17 connected to a source electrode of the first thin film transistor 113a, and a drain electrode of the first thin film transistor 113a is connected to the pixel electrode 117. In addition, the drain of the second thin film transistor 113b is connected to the texture recognition device 111, the gate and the source of the second thin film transistor 113b need to be connected to a signal line, and in order to ensure that the texture recognition device 111 can perform texture recognition normally, an opening 124 needs to be formed at a corresponding position of the black matrix 123 to ensure that light can be incident on the texture recognition device 111 normally.

Specifically, the first thin film transistor 113a and the second thin film transistor 113b each include: an active layer 1131 formed on the third substrate 112 by using a patterning process, a first insulating layer 1132 covering the active layer 1131 and the third substrate 112, a gate electrode 1133 formed on the first insulating layer 1132 by using a patterning process, a second insulating layer 1134 covering the gate electrode 1133 and the first insulating layer 1132, a source electrode 1135 and a drain electrode 1136 formed on the second insulating layer 1134 by using a patterning process, the source electrode 1135 and the drain electrode 1136 being connected to the active layer 1131 through a via hole penetrating the second insulating layer 1134 and the first insulating layer 1132, respectively, and the thin film transistor 113 further includes a third insulating layer 1137 covering the source electrode 1135, the drain electrode 1136, and the second insulating layer 1134. The active layer 1131 may be made of polysilicon, and the patterning process includes thin film deposition, photoresist coating, exposure, development, etching, and the like.

The texture recognition device 111 is a photosensor, the texture recognition device 111 specifically includes a third electrode 1111, a photodiode 1112 formed on the third electrode 1111, and a fourth electrode 1113 formed on the photodiode 1112, and the third electrode 1111 is connected to the drain 1136 of the second thin film transistor 113b through a via hole penetrating through the third insulating layer 1137. The photodiode 1112 includes a first doped layer, an intrinsic layer and a second doped layer, which are stacked, wherein the first doped layer may be a P-type layer, the intrinsic layer may be an I-type layer, and the second doped layer may be an N-type layer; alternatively, the first doped layer may be an N-type layer, the intrinsic layer may be an I-type layer, and the second doped layer may be a P-type layer. The third electrode 1111 refers to a lower electrode of the photodiode 1112, and the fourth electrode 1113 refers to an upper electrode of the photodiode 1112.

In addition, the array substrate 11 further includes a flat layer 114 covering the third insulating layer 1137 and the texture recognition device 111, a common electrode 115 formed on the flat layer 114 by using a patterning process, a fourth insulating layer 116 covering the common electrode 115 and the flat layer 114, and a pixel electrode 117 formed on the fourth insulating layer 116 by using a patterning process, wherein the pixel electrode 117 is connected to the drain 1136 of the first thin film transistor 113a through a via hole penetrating through the fourth insulating layer 116, the flat layer 114, and the third insulating layer 1137. The material of the planarization layer 114 is resin.

Specifically, the scan line 17 and the source 1135 of the first thin film transistor 113a are disposed in the same layer and connected to each other; the common electrode 115 may be a full-area electrode, an opening is provided only at the via hole where the pixel electrode 117 is connected to the drain 1136 of the first thin film transistor 113a, and when a voltage is applied to the pixel electrode 117 through the first thin film transistor 113a, an electric field is formed between the pixel electrode 117 and the common electrode 115 not covered by the pixel electrode 117, and the deflection of the second liquid crystal layer 13 is controlled, so that the screen display of the display panel 10 is realized.

It should be noted that, the texture recognition device 111 is disposed at each position of the display panel 10, so that full-screen fingerprint or palm print recognition can be realized; furthermore, there is no specific positional relationship between the target position in the optical modulation structure 20 and the pixels within the display panel 10.

Optionally, as shown in fig. 11, the display module further includes an object identification module to be detected, where the object identification module to be detected is a touch functional layer 18, and is used to implement a touch function. The present invention does not limit the position and the specific setting of the touch functional layer 18, as long as the touch function can be realized.

The touch functional layer 18 is disposed on the light emitting side of the display panel 10, for example, the touch functional layer 18 is disposed on a side of the fourth substrate 121 far from the black matrix 123, or the touch functional layer 18 is disposed on a side of the third polarizer 15 far from the fourth substrate 121 for implementing a touch function. Preferably, the touch function layer 18 can identify the contact area between the object 30 to be detected and the display panel 10, so as to realize accurate positioning and division of the designated area 18.

In addition, the touch function can also be realized by using a common electrode layer, namely, the common electrode layer is reused as a touch function layer. For example, the common electrode 115 in the common electrode layer may be arranged in a rectangular array to form an array of self-contained touch units. The common electrode layer is reused as a touch control function layer, so that the thickness of the display module can be reduced, and the structure is simplified.

It is understood that when the touch functional layer 18 is disposed on the light emitting side of the display panel 10 in fig. 10 to obtain the structure shown in fig. 11, correspondingly, the touch functional layer 18 is disposed at the corresponding position in fig. 8 and 9.

In the embodiment of the invention, the optical modulation structure is added on the light incident side of the display panel, when the texture recognition is carried out, only the incident light at the target position in the preset area can enter the liquid crystal box and pass through the display panel to irradiate the object to be detected so as to carry out the texture recognition, and the stray light which is not needed and is easy to cause noise is shielded by the optical modulation structure, so that the invalid light intensity generated when the incident light provided by the backlight module is totally reflected on the side of the color film substrate can be effectively reduced, the condition that a texture recognition device is in a saturated state is avoided, and the texture recognition can be realized.

Example two

Referring to fig. 12, a flowchart of a driving method of a display module according to an embodiment of the present invention is shown, and is applied to driving the display module, where the driving method specifically includes the following steps:

step 1201, when the texture recognition is performed, controlling the optical modulation structure to convert incident light provided by the backlight module at the target position in the preset area into first polarized light, so that the first polarized light passes through the display panel and irradiates on an object to be detected on the light-emitting side of the display panel.

In the embodiment of the present invention, when texture recognition is required, the optical modulation structure 20 receives incident light provided by the backlight module, and controls the optical modulation structure 20 to convert the incident light provided by the backlight module at the target position in the preset region into first polarized light, so that the first polarized light passes through the display panel 10 and irradiates on the object 30 to be detected located at the light emitting side of the display panel 10, and the incident light at other positions in the preset region except the target position cannot enter the display panel 10.

Preferably, for the structure shown in fig. 3, when performing texture recognition, in order to ensure accuracy of the texture recognition, light reflected by different positions of the object 30 to be detected is prevented from irradiating the same texture recognition device 111, and when the optical modulation structure 20 is controlled to convert incident light provided by the backlight module at a target position in the preset region into first polarized light, the incident light at each target position needs to be sequentially controlled to be converted into the first polarized light based on the first electrode 231 connected to each driving transistor 27.

For example, for the first electrode layer 23 in the optical modulation structure 20 shown in fig. 3, the target position may be the position of the 4 first electrodes 231 in fig. 3 in sequence, and the driving transistors 27 are controlled in sequence through the gate line 41 and the data line 42 in the optical modulation structure 20, so that the incident light at the first electrode 231 on the upper left side can be controlled to be converted into the first polarized light, then the incident light at the first electrode 231 on the upper right side is controlled to be converted into the first polarized light, then the incident light at the first electrode 231 on the lower left side is controlled to be converted into the first polarized light, finally the incident light at the first electrode 231 on the lower right side is controlled to be converted into the first polarized light, the grain images of the object 30 to be detected are detected based on the first polarized light obtained by the four times, and finally the complete image of the object 30 to be detected is synthesized. It is understood that the sequentially opened first electrodes 231 are not limited to the adjacent first electrodes 231, and the first electrodes 231 sequentially controlling the voltage change may be adjusted according to actual needs.

Step 1202, identifying the grain image of the object to be detected according to the light reflected by the object to be detected.

In the embodiment of the present invention, after the first polarized light passes through the display panel 10 and irradiates the object 30 to be detected located on the light emitting side of the display panel 10, the first polarized light irradiated on the object 30 to be detected is reflected on the surface of the object 30 to be detected, the reflected light may irradiate on the texture recognition device 111 in the display panel 10, the texture recognition device 111 receives the light reflected by the object 30 to be detected, and the texture image of the object 30 to be detected is recognized according to the light reflected by the object 30 to be detected.

EXAMPLE III

The embodiment of the invention further provides a display device, which comprises the display module, wherein the display module comprises a display panel 10 and an optical modulation structure 20 arranged on the light incident side of the display panel 10.

As shown in fig. 13, the display device further includes a backlight module 50, and the backlight module 50 is disposed on a side of the optical modulation structure 20 away from the display panel 10, that is, the optical modulation structure 20 is disposed between the backlight module 50 and the display panel 10.

In addition, the display device further includes a cover plate 60 disposed on a side of the display panel 10 away from the optical modulation structure 20, and the cover plate 60 may be a glass cover plate for protecting the display module.

The backlight module 50 may be a side-in type backlight module as shown in fig. 14, and includes a light bar 51 and an optical structure 52 disposed on a light-emitting surface side of the light bar 51, where the optical structure 52 may include a light guide plate, a reflective sheet, a prism sheet, a diffuser sheet, and the like.

Certainly, the backlight module 50 may be a direct type backlight module without a light guide plate, and the direct type backlight module may include a reflector, a prism, and a diffuser, and the like, and the reflector, the prism, the diffuser, and the like in the direct type backlight module may make the light provided by the backlight module 50 be a surface light source, and the position of the backlight in the direct type backlight module has no specific positional relationship with the target position in the optical modulation structure 20.

While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The display module, the driving method thereof and the display device provided by the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A display module, comprising: the display device comprises a display panel and an optical modulation structure arranged on the light incident side of the display panel, wherein the display panel comprises a line identification device;

and in the preset area, the incident light rays at other positions except the target position cannot enter the display panel.

2. The display module according to claim 1, wherein the optical modulation structure comprises a first substrate and a second substrate which are oppositely arranged, a first electrode layer and a second electrode layer which are arranged between the first substrate and the second substrate, and a liquid crystal layer which is arranged between the first electrode layer and the second electrode layer, the optical modulation structure further comprises a first polarizer which is arranged on the side of the first substrate far away from the first electrode layer, and the first substrate is arranged on the side of the second substrate far away from the display panel;

3. The display module according to claim 2, wherein the first electrode layer comprises a plurality of first electrodes distributed in an array, some or all of the first electrodes have openings penetrating the first electrodes, and the target position is a position where some or all of the openings are located;

4. The display module of claim 2, wherein the first electrode layer comprises a plurality of first electrodes distributed in an array, and the optical modulation structure further comprises driving transistors corresponding to the first electrodes one to one and connected to each other.

5. The display module of claim 2, wherein the first electrode layer is at least one first surface electrode, each first surface electrode has a plurality of openings penetrating through the first surface electrode, and the target position is a position where part or all of the openings are located.

6. The display module according to claim 3 or 5, wherein the aperture of the opening is 0.05mm to 0.5mm, and the distance between two adjacent openings is 0.3mm to 15 mm.

7. The display module according to claim 2, wherein the liquid crystal molecules of the first liquid crystal layer are any one of positive liquid crystal molecules, negative liquid crystal molecules, and twisted nematic liquid crystal molecules.

8. The display module according to claim 2, wherein the display panel comprises an array substrate and a color filter substrate which are arranged oppositely, a second liquid crystal layer arranged between the array substrate and the color filter substrate, a second polarizer arranged on one side of the array substrate away from the second liquid crystal layer, and a third polarizer arranged on one side of the color filter substrate away from the second liquid crystal layer;

wherein the grain recognition device is disposed in the array substrate.

9. The display module of claim 8, wherein the transmission axis of the first polarizer is aligned with the transmission axis of the third polarizer; and the transmission axis of the second polaroid is vertical to the transmission axis of the first polaroid and the transmission axis of the third polaroid.

10. The display module according to claim 1, wherein the predetermined area has a plurality of target positions, and the plurality of target positions are distributed in a matrix or a mosaic array.

11. The display module according to claim 1, wherein the display module further comprises an identification module for an object to be detected;

the object identification module to be detected is a touch functional layer.

12. A driving method of a display module, applied to drive the display module according to any one of claims 1 to 11, the driving method comprising:

13. The method according to claim 12, wherein when the first electrode layer in the optical modulation structure includes a plurality of first electrodes distributed in an array and the optical modulation structure further includes driving transistors corresponding to the first electrodes one to one and connected to each other, the step of controlling the optical modulation structure to convert incident light provided by the backlight module at a target position in a predetermined region into first polarized light during texture recognition comprises:

14. A display device comprising a backlight module and the display module according to any one of claims 1 to 11, wherein the backlight module is disposed on a side of the optical modulation structure away from the display panel.