CN113156677B

CN113156677B - Display module, driving method thereof and display device

Info

Publication number: CN113156677B
Application number: CN202110447142.2A
Authority: CN
Inventors: 杨雁; 周文泣; 周婷; 李俊谊
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-07-01
Anticipated expiration: 2041-04-25
Also published as: CN113156677A

Abstract

The invention discloses a display module, a driving method thereof and a display device, and relates to the technical field of display, wherein the display module comprises a display panel and a first panel, wherein the display panel is oppositely arranged, and the first panel is positioned on one side of a light emitting surface of the display panel; the first panel comprises a first substrate, a second substrate and opaque charged particles filled between the first substrate and the second substrate, wherein the first substrate and the second substrate are oppositely arranged; the first panel further comprises a first electrode and a second electrode which are oppositely arranged and positioned in the non-opening area, and a third electrode and a fourth electrode which are oppositely arranged and positioned in the non-opening area along the direction vertical to the light-emitting surface of the display panel; the third electrodes and the four electrodes are at least arranged on two opposite sides of the pixel opening area along the direction parallel to the light-emitting surface of the display panel, the first electrodes are positioned between two adjacent third electrodes, and the second electrodes are positioned between two adjacent fourth electrodes. The switching of the display module at a wide visual angle and a narrow visual angle is realized by controlling the voltage applied to each electrode, and the black peep-proof effect is realized at the same time.

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

The viewing angle is a key index of the display, and the requirements for the viewing angle are different in different application occasions. When a user is in an open environment with privacy requirements, such as entering a withdrawal code, viewing private information on public transportation, or business negotiations, a narrow viewing angle of the display is required to protect the privacy of the user. At this time, the display device with a controllable viewing angle becomes a necessity.

In the related art, when the display device has the peeping prevention function, the peeping prevention function is realized by using the brightness reduction of the highest gray scale picture at a large viewing angle, and from the visual effect, the screen brightness is low, that is, the peeping prevention function is realized by using the brightness reduction of the white state, which is called white state peeping prevention. Although the white peep-proof function can be realized to a certain extent, specific information can still be identified for a common white background black character picture under a large visual angle, and the peep-proof effect needs to be improved.

Disclosure of Invention

In view of this, the invention provides a display module, a driving method thereof and a display device, which are beneficial to realizing a black peep-proof effect, that is, the effect of blacking is seen under a large viewing angle, so as to further improve the peep-proof effect.

In a first aspect, the present application provides a display module, including: the display panel comprises a display panel and a first panel which are arranged oppositely, wherein the first panel is positioned on one side of a light emergent surface of the display panel;

the display area of the display panel includes a plurality of pixel opening areas and a non-opening area disposed around the pixel opening areas;

the first panel comprises a first substrate, a second substrate and opaque charged particles filled between the first substrate and the second substrate, wherein the first substrate and the second substrate are oppositely arranged;

the first panel further comprises a first electrode and a second electrode which are oppositely arranged, and a third electrode and a fourth electrode which are oppositely arranged along the direction vertical to the light-emitting surface of the display panel; the first electrode and the third electrode are positioned on one side of the first substrate facing the second substrate, and the second electrode and the fourth electrode are positioned on one side of the second substrate facing the first substrate; the orthographic projections of the first electrode, the second electrode, the third electrode and the fourth electrode on the light-emitting surface of the display panel are all positioned in the non-opening area; the third electrodes and the four electrodes are at least arranged on two opposite sides of the pixel opening area along a direction parallel to the light-emitting surface of the display panel, the first electrode is positioned between two adjacent third electrodes, and the second electrode is positioned between two adjacent fourth electrodes; the width of the first electrode is larger than that of the third electrode along the arrangement direction of the first electrode and the third electrode; the width of the second electrode is greater than the width of the fourth electrode along the arrangement direction of the second electrode and the fourth electrode.

In a second aspect, the present application provides a driving method for a display module, which is applied to the display module provided by the present application, the driving method includes:

in a first display mode, applying a first voltage signal to the first electrode and the third electrode and applying a second voltage signal to the second electrode and the fourth electrode, wherein the first voltage signal and the second voltage signal form a first voltage difference, and the first voltage difference is greater than or equal to 2V, so that part of the light-proof charged particles are gathered to a side close to the first electrode and the third electrode, and part of the light-proof charged particles are gathered to a side close to the second electrode and the fourth electrode;

in a second display mode, a third voltage signal is applied to the third electrode, a fourth voltage signal is applied to the fourth electrode, a second voltage difference is formed between the third voltage signal and the fourth voltage signal, the second voltage difference is greater than or equal to 2V, and therefore part of the light-proof charged particles are gathered to one side close to the third electrode and part of the light-proof charged particles are gathered to one side close to the fourth electrode.

In a third aspect, the present application provides a display device including the display module provided in the present application.

Compared with the prior art, the display module, the driving method thereof and the display device provided by the invention at least realize the following beneficial effects:

in the display module, the driving method thereof and the display device provided by the invention, the first panel is introduced at one side of the light-emitting surface of the display panel, and the first panel comprises the first substrate and the second substrate which are oppositely arranged and the lightproof charged particles filled between the first substrate and the second substrate along the direction vertical to the light-emitting surface of the display panel, and the positions of the charged particles are changed under the driving of an electric field. Particularly, the first panel further comprises a first electrode and a second electrode which are oppositely arranged, and a third electrode and a fourth electrode which are oppositely arranged, and the third electrode and the fourth electrode are positioned at two opposite sides of the pixel opening area along a direction parallel to the light-emitting surface of the display panel. When a first voltage signal is applied to the first electrode and the third electrode, and a second voltage signal is applied to the second electrode and the fourth electrode, a voltage difference is formed in the first panel by the first voltage signal and the second voltage signal, so that part of the light-proof charged particles are gathered to one side close to the first electrode and the third electrode, and part of the light-proof charged particles are gathered to one side of the second electrode and the fourth electrode. When a third voltage signal is applied to the third electrode and a fourth voltage signal is applied to the fourth electrode, a voltage difference formed by the third voltage signal and the fourth voltage signal causes part of the opaque charged particles to gather to a side close to the third electrode and part of the opaque charged particles to gather to a side close to the fourth electrode, so that an opaque retaining wall is formed between the third electrode and the fourth electrode, a certain blocking effect is performed on light emitted by the display panel, and the display of a large viewing angle of a display screen is avoided, wherein the display mode is a peep-proof display mode, in the peep-proof display mode, light emitted by sub-pixels of the display panel cannot be emitted along the direction of the large viewing angle due to the blocking of the opaque retaining wall, so that the corresponding visual effect is black at the large viewing angle, namely, when the display screen of the display panel is observed at the large viewing angle, a black screen is observed, the actual display picture information cannot be observed, and the effect is the black state peep-proof effect. It is thus clear that, exert voltage to the electrode in the first panel through the control, can realize the switching to display module assembly conventional display mode and peep-proof display mode, but also realized the effect of black state peep-proof, consequently be favorable to promoting display module assembly and display device's peep-proof effect to promote the protect function to user's privacy.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a top view of a display module according to an embodiment of the invention;

FIG. 2 is an AA cross-sectional view of the display module of FIG. 1;

FIG. 3 is a cross-sectional view of another AA of the display module of FIG. 1;

FIG. 4 is a schematic view showing a position of opaque charged particles in a conventional display mode;

FIG. 5 is a schematic view of a position of opaque charged particles in the privacy-protected display mode;

fig. 6 is a schematic layout of a first electrode and a third electrode according to an embodiment of the present invention;

fig. 7 is a schematic layout of a second electrode and a fourth electrode according to an embodiment of the present invention;

FIG. 8 is a view showing a positional relationship of a third electrode and a fourth electrode with a pixel opening area in a cross section;

FIG. 9 is a BB cross-sectional view of the display module of FIG. 1;

FIG. 10 is a schematic view of an arrangement of electrodes on a first substrate in a first panel;

FIG. 11 is a schematic view of an arrangement of electrodes on the second substrate in the first panel;

FIG. 12 is a schematic view of another arrangement of electrodes on the first substrate in the first panel;

FIG. 13 is a schematic view of another arrangement of electrodes on the second substrate in the first panel;

fig. 14 is a flowchart illustrating a driving method of a display module according to an embodiment of the invention;

fig. 15 is a schematic structural diagram of a display device according to an embodiment of the invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 is a top view of a display module according to an embodiment of the present invention, fig. 2 is an AA cross-sectional view of the display module shown in fig. 1, and referring to fig. 1 and fig. 2, the present invention provides a display module 100, including: the display device comprises a display panel 10 and a first panel 20 which are oppositely arranged, wherein the first panel 20 is positioned on one side of a light-emitting surface of the display panel 10;

the display area Q1 of the display panel 10 includes a plurality of pixel opening areas K and a non-opening area F disposed around the pixel opening areas K;

the first panel 20 includes a first substrate 21, a second substrate 22 and opaque charged particles 23 filled between the first substrate 21 and the second substrate 22;

the first panel 20 further includes a first electrode E1 and a second electrode E2 disposed oppositely, and a third electrode E3 and a fourth electrode E4 disposed oppositely, along a direction perpendicular to the light emitting surface of the display panel 10; the first electrode E1 and the third electrode E3 are located on the side of the first substrate 21 facing the second substrate 22, and the second electrode E2 and the fourth electrode E4 are located on the side of the second substrate 22 facing the first substrate 21; the orthographic projections of the first electrode E1, the second electrode E2, the third electrode E3 and the fourth electrode E4 on the light-emitting surface of the display panel 10 are all located in the non-opening area F; along a direction D0 parallel to the light emitting surface of the display panel 10, the third electrode E3 and the four electrodes are disposed at least on two opposite sides of the pixel opening region K, the first electrode E1 is located between two adjacent third electrodes E3, and the second electrode E2 is located between two adjacent fourth electrodes E4; the width S1 of the first electrode E1 is greater than the width S3 of the third electrode E3 in the arrangement direction of the first electrode E1 and the third electrode E3; the width S2 of the second electrode E2 is greater than the width S4 of the fourth electrode E4 in the arrangement direction of the second electrode E2 and the fourth electrode E4.

It should be noted that fig. 1 only illustrates the display module 100 with a rectangular outline by way of example, and does not limit the actual shape of the display module 100, in some other embodiments of the present invention, the shape of the display module 100 may also be embodied as a rounded rectangle, a circle, an ellipse, or other irregular structures including an arc, which is not specifically limited in this respect. Fig. 2 only illustrates a relative positional relationship between the display panel 10 and the first panel 20, and does not show an actual film structure of the display panel 10, and fig. 2 also illustrates only the film layers in the first panel 20, and does not represent actual shapes and sizes of the respective film layers.

It is understood that the pixel opening area K of the display panel 10 mentioned in the embodiment of the present invention refers to an area where the display panel 10 can actually transmit light during the display process; the non-open area F of the display panel 10 refers to an area through which light cannot pass during display, and optionally, the non-open area F is shielded by a light shielding layer. When the display panel 10 of the present invention is embodied as a liquid crystal display panel, please refer to fig. 3, the display panel 10 includes an array substrate 11 and a color film substrate 12 which are oppositely disposed, and a liquid crystal filled between the array substrate 11 and the color film substrate 12, a black matrix BM is disposed on the color film substrate 12, the light-shielding layer located in the non-opening area F may be embodied as the black matrix BM, for example, fig. 3 is another AA cross-sectional view of the display module 100 in fig. 1, in the display module 100, an area where the black matrix BM is disposed along a direction perpendicular to a light-emitting surface of the display panel 10 is the non-opening area F, and an area where the black matrix BM is not disposed is the opening area K.

With reference to fig. 1 to fig. 3, a first panel 20 is introduced to a side of the light-emitting surface of the display panel 10, and the first panel 20 includes a first substrate 21 and a second substrate 22 disposed opposite to each other and opaque charged particles 23 filled between the first substrate 21 and the second substrate 22 along a direction perpendicular to the light-emitting surface of the display panel 10, where positions of the charged particles are changed under the driving of an electric field. Alternatively, the opaque charged particles 23 may be embodied as, for example, black charged particles, specifically, the black charged particles may be embodied as an electrophoretic material or the like, and optionally, a base liquid in which the opaque charged particles 23 are suspended when an electric field is not applied is filled in the first and

second substrates

21 and 22.

In particular, the first panel 20 further includes a first electrode E1 and a second electrode E2 disposed opposite to each other, and a third electrode E3 and a fourth electrode E4 disposed opposite to each other, and the third electrode E3 and the fourth electrode E4 are located on opposite sides of the pixel opening area K in a direction parallel to the light exit surface of the display panel 10. When the first voltage signal is applied to the first electrode E1 and the third electrode E3 and the second voltage signal is applied to the second electrode E2 and the fourth electrode E4, the first voltage signal and the second voltage signal create a voltage difference in the first panel 20, causing a portion of the opaque charged particles 23 to be collected toward a side near the first electrode E1 and the third electrode E3, and part of the opaque charged particles 23 are collected toward one sides of the second electrode E2 and the fourth electrode E4, for example, referring to fig. 4, fig. 4 is a schematic diagram illustrating a position of the opaque charged particles 23 in the conventional display mode, since the electrodes in the first panel 20 are located in the non-opening areas F, which is equivalent to distributing the opaque charged particles 23 to the positions corresponding to the non-opening areas in the first panel 20, the normal display of the pixels in the display panel 10 is not affected, and this display mode is a normal display mode. In addition, since the total width of the first electrode E1 and the third electrode E3 is relatively large, and the total width of the second electrode E2 and the fourth electrode E4 is also relatively large, in the normal display mode, the opaque charged particles near the first electrode E1 and the third electrode E3 are almost tiled on the first electrode E1 and the third electrode E3, and the opaque charged particles near the second electrode E2 and the fourth electrode E4 are almost tiled on the second electrode E2 and the fourth electrode E4, so that light is not shielded, and the display panel can normally display.

When a third voltage signal is applied to the third electrode E3 and a fourth voltage signal is applied to the fourth electrode E4, a voltage difference formed by the third voltage signal and the fourth voltage signal causes a portion of the opaque charged particles 23 to gather toward a side close to the third electrode E3 and a portion of the opaque charged particles 23 to gather toward a side close to the fourth electrode E4, for example, please refer to fig. 5, which is a schematic diagram of a position of the opaque charged particles 23 in the peep-proof display mode shown in fig. 5, because the widths of the third electrode E3 and the fourth electrode E4 are small, when the opaque charged particles gather toward the third electrode E3 or the fourth electrode E4, an opaque wall is formed between the third electrode E3 and the fourth electrode E4, the opaque wall is at least disposed on two opposite sides of the pixel opening region K, a structure similar to a collimating hole is formed, and most of the light is emitted in a direction perpendicular to the light emitting surface, the light emitted along the large visual angle direction is reduced, the light emitted by the display panel 10 is blocked to a certain extent, and the display of the large visual angle of the display picture is avoided. It should be noted that the retaining wall formed by the opaque charged particles in fig. 5 is only an illustration and does not represent an actual situation, and actually the retaining wall formed by the charged particles may not have a continuous structure.

It can be seen that, in the display module 100 provided by the present invention, the first electrode E1, the second electrode E2, the third electrode E3, and the fourth electrode E4 are disposed on the first panel 20, and the switching between the conventional display mode and the peep-proof display mode of the display module 100 can be realized by controlling the voltage applied to the electrodes in the first panel 20, and a black peep-proof effect is also realized.

In an alternative embodiment of the invention, with continued reference to fig. 2 and fig. 3, the orthographic projections of the first electrode E1 and the second electrode E2 on the light emitting surface of the display panel 10 are overlapped, and the orthographic projections of the third electrode E3 and the fourth electrode E4 on the light emitting surface of the display panel 10 are overlapped.

Specifically, since the first electrode E1, the second electrode E2, the third electrode E3 and the fourth electrode E4 are all located at the non-opening region, when the present invention sets the orthographic projections of the first electrode E1 disposed on the first substrate 21 and the second electrode E2 disposed on the second substrate 22 on the light emitting surface of the display panel 10 to coincide, and the orthographic projections of the third electrode E3 arranged on the first substrate 21 and the fourth electrode E4 arranged on the second substrate 22 on the light-emitting surface of the display panel 10 are arranged to coincide, the orthographic projections of the first electrode E1 and the second electrode E2 on the light-emitting surface of the display panel 10 are located in the areas corresponding to the same non-opening areas, the orthographic projections of the third electrode E3 and the fourth electrode E4 on the light-emitting surface of the display panel 10 are also located in the areas corresponding to the same non-opening areas, therefore, the problem of overlarge area of the non-opening area can not be caused, and the influence of the larger non-opening area space occupied by the electrodes on the opening rate of the display module is avoided. In addition, when the orthographic projections of the third electrode E3 and the fourth electrode E4 on the light-emitting surface of the display panel are overlapped, the collimation effect of the light-tight retaining wall formed by the light-tight charged particles between the third electrode E3 and the fourth electrode E4 is better in the peep-proof stage, so that the improvement of the black peep-proof effect is facilitated.

In an alternative embodiment of the invention, with continued reference to fig. 2 and 3, the first electrode E1 and the third electrode E3 are disposed in the same layer, and the second electrode E2 and the fourth electrode E4 are disposed in the same layer.

Specifically, with continued reference to fig. 2 and fig. 3, the first electrode E1 and the third electrode E3 are disposed in the same layer, which means that the first electrode E1 and the third electrode E3 are disposed in the same layer and manufactured by the same process; the second electrode E2 and the fourth electrode E4 are disposed in the same layer, which means that the second electrode E2 and the fourth electrode E4 are disposed in the same layer and manufactured by the same process. Therefore, the third electrode E3 can be manufactured while the first electrode E1 is manufactured, and the first electrode E1 and the third electrode E3 can be manufactured by using the same mask in the same manufacturing process, so that the manufacturing process of the first electrode E1 and the third electrode E3 is simplified, and the production efficiency of the display module is improved. Similarly, the fourth electrode E4 can be manufactured while the second electrode E2 is manufactured, and the fourth electrode E4 and the second electrode E2 can be manufactured by using the same mask in the same manufacturing process, so that the manufacturing processes of the second electrode E2 and the fourth electrode E4 are simplified, and the production efficiency of the display module is improved.

In an alternative embodiment of the present invention, fig. 6 is a schematic layout diagram of the first electrode E1 and the third electrode E3 provided in the embodiment of the present invention, fig. 7 is a schematic layout diagram of the second electrode E2 and the fourth electrode E4 provided in the embodiment of the present invention, please refer to fig. 6 and fig. 7, each first electrode E1 is electrically connected and connected to the first voltage signal input terminal 31, each second electrode E2 is electrically connected and connected to the second voltage signal input terminal 32, each third electrode E3 is electrically connected and connected to the third voltage signal input terminal 33, and each fourth electrode E4 is electrically connected and connected to the fourth voltage signal input terminal 34.

Specifically, fig. 6 shows an arrangement structure in which the first electrode E1 and the third electrode E3 are arranged along a first direction and extend along a second direction, please refer to fig. 3 and fig. 6, the first connection portion 41 is introduced on the first substrate 21, and each first electrode E1 is electrically connected to the first connection portion 41, so that each first electrode E1 is equipotential, and when a voltage signal is input through the first voltage signal input terminal 31, each first electrode E1 can receive a corresponding voltage signal, thus a process of respectively inputting a voltage signal to each first electrode E1 through different voltage signal input terminals is omitted, which is not only beneficial to ensuring consistency of voltages received by each first electrode E1, but also beneficial to simplifying the overall design of the first panel in the display module. Similarly, referring to fig. 3 and fig. 6, the second connection portion 42 is introduced on the first substrate 21, each third electrode E3 is electrically connected to the second connection portion 42, and the process of providing voltage signals to the plurality of third electrodes E3 can be implemented by using one second voltage signal input end 32, so that the consistency of the voltage signals received by the third electrodes E3 can be ensured, and the overall design of the first panel in the display module can be simplified.

Fig. 7 shows an arrangement structure in which the second electrode E2 and the fourth electrode E4 are arranged along the first direction and extend along the second direction, please refer to fig. 3 and 7, the third connection portion 43 is introduced on the second substrate 22, and each second electrode E2 is electrically connected to the third connection portion 43, so that each second electrode E2 is equipotential, and when a voltage signal is input through the third voltage signal input end 33, each second electrode E2 can receive a corresponding voltage signal, thus, a process of respectively inputting a voltage signal to each second electrode E2 through different voltage signal input ends is omitted, which is not only beneficial to ensuring consistency of voltages received by each second electrode E2, but also beneficial to simplifying the overall design of the first panel 20 in the display module. Similarly, referring to fig. 3 and 7, the fourth connecting portion 44 is introduced on the second substrate 22, each fourth electrode E4 is electrically connected to the fourth connecting portion 44, and the process of providing the voltage signal to the plurality of fourth electrodes E4 can be implemented by using one fourth voltage signal input end 34, so that the consistency of the voltage signal received by the fourth electrode E4 is ensured, and the overall design of the first panel 20 is simplified.

In an alternative embodiment of the present invention, please refer to fig. 1, fig. 3, fig. 6 and fig. 7, the pixel opening areas K are arranged in an array along a first direction and a second direction, the pixel opening areas K form a plurality of opening rows L arranged along the first direction, the pixel opening areas K in the opening rows L are arranged along the second direction, and the first direction and the second direction intersect;

the first electrode E1, the second electrode E2, the third electrode E3, and the fourth electrode E4 are all strip-shaped electrodes and all extend along the second direction, and the orthographic projections of the first electrode E1, the second electrode E2, the third electrode E3, and the fourth electrode E4 on the light-emitting surface of the display panel 10 are located in the non-opening areas between the opening rows L.

Specifically, in the invention, the first electrode E1, the second electrode E2, the third electrode E3 and the fourth electrode E4 in the first panel 20 are all arranged as strip-shaped electrodes extending along the second direction, and in the privacy protection mode, when voltages are applied to the third electrode E3 and the fourth electrode E4, respectively, to form an electric field between the first substrate 21 and the second substrate 22, the light-tight charged particles 23 will form a light-shielding wall between the third electrode E3 and the fourth electrode E4, for example, please refer to fig. 5; when the display module 100 is observed along the first direction at a large viewing angle, due to the shading effect of the shading retaining wall, the display module will show black visual effect at the large viewing angle, so that a black peep-proof effect is realized, and the privacy of a user is effectively protected.

In an alternative embodiment of the invention, please continue to refer to fig. 6 to 8, wherein fig. 8 is a relative position relationship diagram of the third electrode E3 and the fourth electrode E4 and the pixel opening area K in the display module 100 provided in the embodiment of the invention, in the non-opening area between the opening rows L, along the direction perpendicular to the light exit surface of the display panel 10, the minimum distance between the third electrode E3 and the edge projection of the adjacent pixel opening area K is D1, and D1 is greater than or equal to 0 and less than or equal to 1 μm; referring to FIG. 7, the minimum distance between the fourth electrode E4 and the edge projection of the adjacent pixel opening area K is D2, 0 ≦ D2 ≦ 1 μm.

FIGS. 6 and 7 can embody the positional relationship of the third electrode E3 and the fourth electrode E4 with the pixel opening area K on the plane, FIG. 8 shows the positional relationship between the third electrode E3 and the fourth electrode E4 and the pixel opening area K on the cross section, please refer to FIGS. 6 to 8, in the present invention, the distance between the projection of the edge of the third electrode E3 and the pixel opening area K adjacent to the third electrode E3 on the light emitting surface is set within 1 μm, so that the edge of the third electrode E3 and the edge of the pixel opening area K adjacent thereto are as close as possible, for example, the orthographic projections of the edge of the third electrode E3 and the edge of the pixel opening area K adjacent thereto are set to coincide, the smaller the distance therebetween in the direction parallel to the light exit surface of the display panel 10, the shading retaining wall formed in the peeping-proof stage has better shading effect on light rays, and further the peeping-proof effect of the display module under a large visual angle is promoted. Similarly, the minimum distance between the fourth electrode E4 and the edge projection of the pixel opening area K in the countryside is set to be within 1 μm, so that the edge of the fourth electrode E4 is as close as possible to the edge of the pixel opening area K adjacent to the fourth electrode E4, for example, the orthographic projections of the edge of the fourth electrode E4 and the edge of the pixel opening area K adjacent to the fourth electrode E4 are set to be coincident, so that the light shielding effect of the light shielding retaining wall formed between the third electrode E3 and the fourth electrode E4 in the peeping prevention stage is better, the peeping prevention effect of the display module at a large viewing angle is better promoted, and the privacy of a user is better protected.

In an alternative embodiment of the invention, fig. 9 is a BB cross-sectional view of the display module 100 in fig. 1, fig. 10 is a schematic layout of electrodes on the first substrate 21 in the first panel 20, fig. 11 is a schematic layout of electrodes on the second substrate 22 in the first panel 20, the first panel 20 further includes a fifth electrode E5 and a sixth electrode E6 that are oppositely disposed, the fifth electrode E5 is located on a side of the first substrate 21 facing the second substrate 22, and the sixth electrode E6 is located on a side of the second substrate 22 facing the first substrate 21; the orthographic projections of the fifth electrode E5 and the sixth electrode E6 on the light-emitting surface of the display panel 10 are located in the non-opening area F, and the fifth electrode E5 and the sixth electrode E6 both extend along the first direction and are located at two sides of the pixel opening area K along the second direction.

Specifically, referring to fig. 10, the fifth electrode E5 is introduced on the first substrate 21 in the first panel 20, and the orthographic projection of the fifth electrode E5 on the light emitting surface of the display panel 10 is located on two opposite sides of the pixel opening area K along the second direction, referring to fig. 11, the sixth electrode E6 is introduced on the second substrate 22 in the first panel 20, and the orthographic projection of the sixth electrode E6 on the light emitting surface of the display panel 10 is located on two opposite sides of the pixel opening area K along the second direction. The relative position relationship between the fifth electrode E5 and the sixth electrode E6 in the display module can be referred to FIG. 9. In addition to providing voltage signals to the third electrode E3 and the fourth electrode E4 to form a voltage difference between the third electrode E3 and the fourth electrode E4 in the peep-proof stage, voltage signals may be provided to the fifth electrode E5 and the sixth electrode E6 at the same time to form a voltage difference between the fifth electrode E5 and the sixth electrode E6, alternatively, the voltage signals applied to the third electrode E3 and the fifth electrode E5 are the same, and the voltage signals applied to the fourth electrode E4 and the sixth electrode E6 are the same, so that the light-tight charged particles 23 form light-tight barriers between the fifth electrode E5 and the sixth electrode E6 in addition to the light-tight barriers formed between the third electrode E3 and the fourth electrode E4, which is equivalent to the light-tight barriers formed around each pixel opening region K in the peep-proof stage, that the light-tight barriers are formed not only on both sides in the first direction, but also on both sides in the second direction, so make the display module assembly all possess the black state peep-proof effect of preferred under the large visual angle of equidirectional not, therefore be favorable to promoting the peep-proof performance of display module assembly more.

In an alternative embodiment of the present invention, with continued reference to fig. 9-11, the fifth electrode E5 is disposed in the same layer as the third electrode E3, and the sixth electrode E6 is disposed in the same layer as the fourth electrode E4.

Referring to fig. 3, 9 and 10, the third electrode E3 and the fifth electrode E5 are both disposed on the first substrate 21, and when the fifth electrode E5 and the third electrode E3 are disposed on the same layer, the third electrode E3 and the fifth electrode E5 are fabricated in the same process, so that different fabrication processes do not need to be introduced into the third electrode E3 and the fifth electrode E5, and the fabrication of the third electrode E3 and the fifth electrode E5 can be completed in the same process at the same time, which is beneficial to saving the fabrication process of the display module and improving the fabrication efficiency of the display module. Similarly, referring to fig. 3, 9 and 11, the sixth electrode E6 and the fourth electrode E4 are disposed on the second substrate 22, and when the sixth electrode E6 and the fourth electrode E4 are disposed on the same layer, the sixth electrode E6 and the fourth electrode E4 are fabricated in the same process, so that different fabrication processes do not need to be introduced into the sixth electrode E6 and the fourth electrode E4, which is also beneficial to saving the fabrication process of the display module and improving the fabrication efficiency of the display module.

Optionally, referring to fig. 3 and fig. 9, since the first electrode E1, the third electrode E3, and the fifth electrode E5 are all disposed on the first substrate 21, the first electrode E1, the third electrode E3, and the fifth electrode E5 can be fabricated in the same process by using the same mask, and since the second electrode E2, the fourth electrode E4, and the sixth electrode E6 are all disposed on the second substrate 22, the second electrode E2, the fourth electrode E4, and the sixth electrode E6 can be fabricated in the same process by using the same mask, the fabrication process of the display module is further simplified, and the fabrication efficiency of the display module is improved.

Fig. 12 is a schematic diagram showing another arrangement of electrodes on the first substrate 21 in the first panel 20, and fig. 13 is a schematic diagram showing another arrangement of electrodes on the second substrate 22 in the first panel 20, please refer to fig. 3, fig. 9 and fig. 12, when a fifth electrode E5 is introduced on the first substrate 21 and a sixth electrode E6 is introduced on the second substrate 22, the fifth electrode E5 can be electrically connected to the third electrode E3, and the fifth electrode E5 is connected to the same voltage signal input terminal as the third electrode E3; referring to fig. 3, 9 and 13, the sixth electrode E6 can be electrically connected to the fourth electrode E4, and the sixth electrode E6 is connected to the same voltage signal input terminal as the fourth electrode E4; in this way, the same signal input terminal may be used to simultaneously provide voltage signals to the third electrode E3 and the fifth electrode E5 on the first substrate 21, and another signal input terminal may be used to simultaneously provide voltage signals to the fourth electrode E4 and the sixth electrode E6 on the second substrate 22, and there is no need to additionally provide different voltage signal input terminals for the fifth electrode E5 and the sixth electrode E6, which is not only beneficial to simplifying the structure of the display module, but also beneficial to maintaining the potential consistency of the third electrode E3 and the fifth electrode E5, and the potential consistency of the fourth electrode E4 and the sixth electrode E6.

In an alternative embodiment of the present invention, referring to fig. 9, the orthographic projections of the fifth electrode E5 and the sixth electrode E6 on the light-emitting surface of the display panel 10 are overlapped.

Specifically, since the fifth electrode E5 and the sixth electrode E6 are non-open areas, when the fifth electrode E5 and the sixth electrode E6 are introduced into the display module, and orthographic projections of the fifth electrode E5 and the sixth electrode E6 on the light-emitting surface of the display panel 10 are overlapped, orthographic projections of the fifth electrode E5 and the sixth electrode E6 on the light-emitting surface of the display panel 10 are located in an area corresponding to the same non-open area, so that the problem that the area of the non-open area is too large is not caused, and the influence on the aperture ratio of the display module due to the fact that the fifth electrode E5 and the sixth electrode E6 occupy a larger non-open area space is avoided. In addition, when the orthographic projections of the fifth electrode E5 and the sixth electrode E6 on the light emitting surface of the display panel 10 are overlapped, in the peeping prevention stage, the collimation effect of the opaque retaining wall formed by the opaque charged particles between the fifth electrode E5 and the sixth electrode E6 is better, so that the improvement of the black peeping prevention effect is more facilitated.

Based on the same inventive concept, the present invention further provides a driving method of a display module, and fig. 14 is a flowchart of the driving method of the display module according to the embodiment of the present invention, where the driving method is applied to the display module according to any one of the embodiments of the present invention, and please refer to fig. 3 to 5, the driving method includes:

in the first display mode, a first voltage signal is applied to the first electrode E1 and the third electrode E3, and a second voltage signal is applied to the second electrode E2 and the fourth electrode E4, the first voltage signal and the second voltage signal form a first voltage difference, the first voltage difference is greater than or equal to 2V, so that part of the opaque charged particles 23 are gathered to a side close to the first electrode E1 and the third electrode E3, and part of the opaque charged particles 23 are gathered to a side close to the second electrode E2 and the fourth electrode E4;

in the second display mode, a third voltage signal is applied to the third electrode E3, and a fourth voltage signal is applied to the fourth electrode E4, the third voltage signal and the fourth voltage signal form a second voltage difference, and the second voltage difference is greater than or equal to 2V, so that part of the opaque charged particles 23 are gathered to a side close to the third electrode E3, and part of the opaque charged particles 23 are gathered to a side close to the fourth electrode E4.

Specifically, the driving method of the display module provided by the invention comprises a first display mode and a second display mode, wherein the first display mode corresponds to a conventional display mode, and the second display mode corresponds to an anti-peep display mode.

In the first display mode, please refer to fig. 4, a first voltage signal is applied to the first electrode E1 and the third electrode E3, and a second voltage signal is applied to the second electrode E2 and the fourth electrode E4, so that a first voltage difference is formed between the first substrate 21 and the second substrate 22, and the first voltage difference is greater than or equal to 2V. When the first voltage difference between the first substrate 21 and the second substrate 22 is greater than or equal to 2V, under the driving of the electric field, the partially opaque charged particles will be gathered toward the first electrode E1 and the side of the third electrode E3, and the partially opaque charged particles will be gathered toward the second electrode E2 and the side of the fourth electrode E4, since the electrodes in the first panel 20 are located in the non-open region, which is equivalent to distributing the opaque charged particles 23 to the position corresponding to the non-open region in the first panel 20, the normal display of the pixels in the display panel 10 is not affected, and this display mode is the normal display mode. In addition, since the total width of the first electrode E1 and the third electrode E3 is relatively large, and the total width of the second electrode E2 and the fourth electrode E4 is also relatively large, in the normal display mode, the opaque charged particles near the first electrode E1 and the third electrode E3 are almost tiled on the first electrode E1 and the third electrode E3, and the opaque charged particles near the second electrode E2 and the fourth electrode E4 are almost tiled on the second electrode E2 and the fourth electrode E4, so that light is not shielded, and the display panel can normally display.

In a second display mode, please refer to fig. 5, when a third voltage signal is applied to the third electrode E3 and a fourth voltage signal is applied to the fourth electrode E4, a second voltage difference is formed between the third voltage signal and the fourth voltage signal, when the second voltage difference is greater than or equal to 2V, a part of the opaque charged particles 23 are gathered to a side close to the third electrode E3, and a part of the opaque charged particles 23 are gathered to a side close to the fourth electrode E4, because the widths of the third electrode E3 and the fourth electrode E4 are smaller, when the opaque charged particles are gathered to the third electrode E3 or the fourth electrode E4, a light-opaque wall is formed between the third electrode E3 and the fourth electrode E4, the light-wall is at least disposed on two opposite sides of the pixel opening area K, and forms a structure similar to a straight hole, so that most of light is emitted in a direction perpendicular to the light emitting surface, and light emitted in a large viewing angle direction is reduced, the light emitted by the display panel 10 is blocked to a certain extent, so that the display picture is prevented from being displayed at a large viewing angle, the display mode is a peep-proof display mode, in the peep-proof display mode, due to the blocking of the light-tight retaining wall, the corresponding visual effect at the large viewing angle is black, namely when the display picture of the display panel is observed at the large viewing angle, the black picture is observed, and therefore the black peep-proof display effect is achieved.

It is thus clear that, exert voltage to the electrode in the first panel 20 through control, can realize the switching to display module assembly conventional display mode and peep-proof display mode, but also realized the effect of black state peep-proof, black state peep-proof compares in the white state peep-proof among the relevant prior art more to be favorable to promoting the peep-proof effect of display module assembly, is favorable to promoting the protect function to user's privacy.

In an alternative embodiment of the present invention, in the first display mode, the first voltage signal and the second voltage signal have opposite polarities; and/or in the second display mode, the polarity of the third voltage signal is opposite to that of the fourth voltage signal.

Specifically, in the first display mode, please refer to fig. 4, the first voltage signal and the second voltage signal may be opposite signals, for example, when the first voltage signal is +5V, the second voltage signal may be-5V, such that the negatively charged particles in the opaque charged particles 23 will be collected to one side of the first electrode E1 and the third electrode E3, and the positively charged particles will be collected to one side of the second electrode E2 and the fourth electrode E4, and the larger the voltage difference between the first substrate 21 and the second substrate 22 is, the more favorable the movement of the charged particles is driven, so that the charged particles reach the predetermined position. It should be understood that the above +5V and-5V are only examples, and in some other embodiments of the present invention, the above voltage value may also be selected as other values according to actual requirements, for example, +6V and-6V, +4V and-4V, etc., which is not limited in this respect by the present invention. The purpose of the polarity reversal of the first voltage signal and the second voltage signal is to increase the voltage difference between the first substrate 21 and the second substrate 22, and of course, as long as the voltage difference is ensured to be greater than or equal to 2V, the corresponding voltage values of the first voltage signal and the second signal can also be represented as +5V and 0V, or-5V and 0V, etc., and are not limited by the condition of polarity reversal.

Similarly, in the second display mode, referring to fig. 5, the third voltage signal and the fourth voltage signal may be opposite polarity signals, for example, when the third voltage signal is +5V, the fourth voltage signal may be-5V, such that negatively charged particles in the opaque charged particles 23 will be gathered to one side of the third electrode E3, and positively charged particles will be gathered to one side of the fourth electrode E4, and the larger the voltage difference between the first substrate 21 and the second substrate 22 is, the more favorable the movement of the charged particles is driven, so that the charged particles reach a predetermined position, that is, an opaque dam is formed between the third electrode E3 and the fourth electrode E4, thereby implementing the black peep prevention function. It should be understood that the above +5V and-5V are only examples, and in some other embodiments of the present invention, the voltage value may be selected as other values according to actual requirements, such as +6V and-6V, +4V and-4V, etc., which is not limited in this respect. The purpose of the polarity reversal of the third voltage signal and the fourth voltage signal is to increase the voltage difference between the first substrate 21 and the second substrate 22, and of course, as long as the voltage difference is ensured to be greater than or equal to 2V, the corresponding voltage values of the third voltage signal and the second signal can also be represented as +5V and 0V, or-5V and 0V, etc., and are not limited by the condition of polarity reversal.

In an alternative embodiment of the present invention, referring to fig. 5, in the second display mode, the first electrode E1 and the second electrode E2 are grounded, or the first electrode E1 and the second electrode E2 are floating.

Specifically, in the second display mode, that is, the peep-proof display mode, the third voltage signal and the fourth voltage signal are respectively applied to the third electrode E3 and the fourth electrode E4, so that a voltage difference for driving the light-tight charged particles 23 to displace is formed between the third electrode E3 and the fourth electrode E4, at this time, the first electrode E1 and the second electrode E2 are grounded, or the first electrode E1 and the second electrode E2 are floated, so that the first electrode E1 and the second electrode E2 are grounded or have no voltage, thereby preventing the voltage difference formed between the first electrode E1 and the second electrode E2 from affecting the movement of the light-tight charged particles 23 in the peep-proof mode, and ensuring that the light-tight charged particles 23 form a light-tight barrier between the third electrode E3 and the fourth electrode E4 in the peep-proof display mode to achieve the black-state peep-proof performance.

Based on the same inventive concept, the present invention further provides a display device, and fig. 15 is a schematic structural diagram of the display device according to the embodiment of the present invention, where the display device includes the display module 100 according to any one of the embodiments of the present invention. With reference to fig. 2-5 and fig. 15, in the display device, when a third voltage signal is applied to the third electrode E3 and a fourth voltage signal is applied to the fourth electrode E4, a voltage difference formed between the third voltage signal and the fourth voltage signal causes a portion of the opaque charged particles 23 to gather at a side close to the third electrode E3 and a portion of the opaque charged particles 23 to gather at a side close to the fourth electrode E4, so that opaque barriers are formed at the third electrode E3 and the fourth electrode E4, and a certain blocking effect is performed on light emitted by the display panel 10 to prevent the display screen from displaying at a large viewing angle.

It should be noted that, for the embodiments of the display device provided in the embodiments of the present application, reference may be made to the embodiments of the display module described above, and repeated descriptions are omitted. The apparatus provided herein may be embodied as: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

In summary, the display module, the driving method thereof and the display device provided by the invention at least achieve the following beneficial effects:

in the display module, the driving method thereof and the display device provided by the invention, the first panel is introduced at one side of the light-emitting surface of the display panel, and the first panel comprises the first substrate and the second substrate which are oppositely arranged and the lightproof charged particles filled between the first substrate and the second substrate along the direction vertical to the light-emitting surface of the display panel, and the positions of the charged particles are changed under the driving of an electric field. Particularly, the first panel further comprises a first electrode and a second electrode which are oppositely arranged, and a third electrode and a fourth electrode which are oppositely arranged, and the third electrode and the fourth electrode are positioned on two opposite sides of the pixel opening area along the direction parallel to the light-emitting surface of the display panel. When a first voltage signal is applied to the first electrode and the third electrode, and a second voltage signal is applied to the second electrode and the fourth electrode, a voltage difference is formed in the first panel by the first voltage signal and the second voltage signal, so that part of the light-proof charged particles are gathered to one side close to the first electrode and the third electrode, and part of the light-proof charged particles are gathered to one side of the second electrode and the fourth electrode. Because the total width of the first electrode and the third electrode is larger, and the total width of the second electrode and the fourth electrode is also larger, in a normal display mode, the lightproof charged particles close to the first electrode and the third electrode are almost tiled on the first electrode and the third electrode, and the lightproof charged particles close to the second electrode and the fourth electrode are almost tiled on the second electrode and the fourth electrode, so that light rays can not be shielded, and the display panel can normally display.

When a third voltage signal is applied to the third electrode and a fourth voltage signal is applied to the fourth electrode, a voltage difference formed by the third voltage signal and the fourth voltage signal causes part of the opaque charged particles to gather to a side close to the third electrode and causes part of the opaque charged particles to gather to a side close to the fourth electrode, because the widths of the third electrode E3 and the fourth electrode E4 are small, when the opaque charged particles gather to the third electrode E3 or the fourth electrode E4, an opaque barricade is formed between the third electrode and the fourth electrode, and a certain blocking effect is performed on light emitted by the display panel to prevent the display screen from displaying at a large viewing angle, which is a peep-proof display mode in which a corresponding visual effect at a large viewing angle is black due to the blocking of the opaque barricade, that is, namely, when the display screen of the display panel is observed at a large viewing angle, the observed picture is a black picture, and the actual display picture information cannot be observed, so that the black peep-proof display effect is realized.

It is thus clear that, exert voltage to the electrode in the first panel through the control, can realize the switching to display module assembly conventional display mode and peep-proof display mode, but also realized the effect of black state peep-proof, consequently be favorable to promoting display module assembly and display device's peep-proof effect, be favorable to promoting the protect function to user's privacy.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display module, comprising: the display panel comprises a display panel and a first panel which are arranged oppositely, wherein the first panel is positioned on one side of a light emergent surface of the display panel;

the first panel further comprises a first electrode and a second electrode which are oppositely arranged, and a third electrode and a fourth electrode which are oppositely arranged along the direction vertical to the light-emitting surface of the display panel; the first electrode and the third electrode are positioned on one side of the first substrate facing the second substrate, and the second electrode and the fourth electrode are positioned on one side of the second substrate facing the first substrate; the orthographic projections of the first electrode, the second electrode, the third electrode and the fourth electrode on the light-emitting surface of the display panel are all positioned in the non-opening area; the third electrodes and the four electrodes are at least arranged on two opposite sides of the pixel opening area along a direction parallel to the light-emitting surface of the display panel, the first electrode is positioned between two adjacent third electrodes, and the second electrode is positioned between two adjacent fourth electrodes; the width of the first electrode is larger than that of the third electrode along the arrangement direction of the first electrode and the third electrode; the width of the second electrode is larger than that of the fourth electrode along the arrangement direction of the second electrode and the fourth electrode;

the pixel opening areas are arranged in an array along a first direction and a second direction, the pixel opening areas form a plurality of opening columns arranged along the first direction, the pixel opening areas in the opening columns are arranged along the second direction, and the first direction and the second direction are intersected;

the first electrode, the second electrode, the third electrode and the fourth electrode are strip-shaped electrodes and extend along the second direction, and orthographic projections of the first electrode, the second electrode, the third electrode and the fourth electrode on a light-emitting surface of the display panel are located in the non-opening areas among the opening rows.

2. The display module according to claim 1, wherein orthographic projections of the first electrode and the second electrode on the light exit surface of the display panel are overlapped, and orthographic projections of the third electrode and the fourth electrode on the light exit surface of the display panel are overlapped.

3. The display module of claim 1, wherein the first electrode and the third electrode are disposed in the same layer, and the second electrode and the fourth electrode are disposed in the same layer.

4. The display module of claim 1, wherein each of the first electrodes is electrically connected to a first voltage signal input terminal, each of the second electrodes is electrically connected to a second voltage signal input terminal, each of the third electrodes is electrically connected to a third voltage signal input terminal, and each of the fourth electrodes is electrically connected to a fourth voltage signal input terminal.

5. The display module according to claim 1, wherein in the non-opening areas between the rows of openings, the minimum distance between the third electrode and the edge projection of the adjacent pixel opening area in the direction perpendicular to the light exit surface of the display panel is D1, 0 ≦ D1 ≦ 1 μm; the minimum distance between the fourth electrode and the edge projection of the adjacent pixel opening area is D2, and D2 is more than or equal to 0 and less than or equal to 1 mu m.

6. The display module according to claim 1, wherein the first panel further comprises a fifth electrode and a sixth electrode disposed oppositely, the fifth electrode is located on a side of the first substrate facing the second substrate, and the sixth electrode is located on a side of the second substrate facing the first substrate; the orthographic projections of the fifth electrode and the sixth electrode on the light-emitting surface of the display panel are located in the non-opening area, the fifth electrode and the sixth electrode extend along the first direction and are located on two sides of the pixel opening area along the second direction.

7. The display module according to claim 6, wherein the fifth electrode and the third electrode are disposed in the same layer, and the sixth electrode and the fourth electrode are disposed in the same layer.

8. The display module according to claim 6, wherein orthographic projections of the fifth electrode and the sixth electrode on the light emitting surface of the display panel are overlapped.

9. A driving method of a display module, applied to the display module according to any one of claims 1 to 8, the driving method comprising:

10. The driving method according to claim 9, wherein in the first display mode, the first voltage signal and the second voltage signal have opposite polarities; and/or, in the second display mode, the third voltage signal and the fourth voltage signal have opposite polarities.

11. The driving method according to claim 9, wherein in the second display mode, the first electrode and the second electrode are grounded, or the first electrode and the second electrode are floated.

12. A display device, comprising the display module of any one of claims 1 to 8.