Electrophoretic display panel and control method

Abstract

The application relates to an electrophoretic display panel and a control method. The electrophoretic display panel comprises a first substrate, a second substrate and an electrophoretic layer between the two substrates. The first substrate comprises sub-pixels arranged in an array and spaced from each other. The electrophoretic layer comprises a stabilizing liquid in each sub-pixel and an ink liquid arranged below the stabilizing liquid in layers. Each sub-pixel comprises at least one light-reflecting structure. The light-reflecting structure is immersed in the stabilizing liquid and the ink liquid. The second substrate is provided with a horizontal electric field corresponding to each sub-pixel. A vertical electric field corresponding to each sub-pixel is formed between the first substrate and the second substrate. The vertical electric field is used to drive the ink liquid and the stabilizing liquid to move relative to each other, so that at least part of the ink liquid is located between the first substrate and the light-reflecting structure to form a color display state. The horizontal electric field is used to drive the light-reflecting structure to deflect relative to a preset position region of the first substrate. The deflection angle is consistent with user visual line data.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrophoretic display, in particular to an electrophoretic display panel and a control method. BACKGROUND

[0002] Electronic paper, as a kind of reflective display, displays screen content by reflecting natural light. The stronger the natural light, the more obvious the display, which has a certain protective effect on the human eye, and therefore attracts people's attention. As a kind of display simulating paper, electronic paper has the characteristics of lightness, simple process, small power consumption, eye protection, and reusability compared with paper, and has a great development market.

[0003] However, general electronic paper can only reflect ambient light at a fixed angle, which will cause the best viewing effect when looking directly at the electronic paper, and the viewing effect will gradually weaken with the increase of angle when looking from the side, affecting the user's viewing. SUMMARY

[0004] The present application provides an electrophoretic display panel and a driving method to solve the technical problem that the viewing effect of the existing side-viewing electronic paper gradually weakens with the increase of angle.

[0005] The electrophoretic display panel provided by the present application comprises a first substrate, a second substrate and an electrophoretic layer between the two, the first substrate comprises sub-pixels arranged in an array and spaced from each other, the electrophoretic layer comprises a stabilizing liquid in each sub-pixel and an ink liquid arranged below the stabilizing liquid; each sub-pixel comprises at least one light-reflecting structure, the light-reflecting structure is immersed in the stabilizing liquid and the ink liquid; the second substrate is formed with a horizontal electric field corresponding to each sub-pixel; a vertical electric field corresponding to each sub-pixel is formed between the first substrate and the second substrate, the vertical electric field is used to drive the ink liquid and the stabilizing liquid to move relative to each other, so as to form a color developing state that at least part of the ink liquid is located between the first substrate and the light-reflecting structure; the horizontal electric field is used to drive the light-reflecting structure to deflect relative to the preset position area of the first substrate, and the direction and angle of deflection are consistent with the user's line of sight.

[0006] The electrophoretic display panel further comprises a control system and an image acquisition device, the image acquisition device is used to acquire user's line of sight information in real time, and send the user's line of sight information to the control system, the control system processes the user's line of sight information to obtain user's line of sight data, and the control system adjusts the direction and size of the horizontal electric field according to the user's line of sight data.

[0007] The second substrate is formed with a first driving electrode and a second driving electrode corresponding to each of the sub-pixels, the first driving electrode and the second driving electrode are located on both sides of each of the sub-pixels along a first direction, and the control system is used to control the voltage of the first driving electrode and the second driving electrode respectively to form the horizontal electric field along the first direction.

[0008] The second substrate is further formed with a third driving electrode corresponding to each of the sub-pixels, the first substrate is formed with a common electrode corresponding to each of the sub-pixels, the control system controls the voltage of the common electrode and the third driving electrode respectively to form the vertical electric field therebetween, the vertical electric field is used to drive the movement of the ink liquid along a second direction, and the vertical electric field does not affect the horizontal electric field.

[0009] In the rotation process, the light-emitting side of the adjacent two light-reflecting structures forms a continuous reflection surface along the irradiation direction of the ambient light at different angles, and the ink liquid between the adjacent two light-reflecting structures does not appear in the display area of the first substrate.

[0010] The light-reflecting structure is configured as a three-dimensional geometric shape enclosed by a first reflection surface and a second reflection surface, the first reflection surface is arranged towards the first substrate, the second reflection surface is arranged towards the second substrate, and the second reflection surface of the light-reflecting structure is used to slide with the surface of the second substrate to enable the light-reflecting structure to swing relative to the preset position area of the first substrate.

[0011] The surface of the second substrate has a recessed area, the second reflection surface is configured as a curved surface shape matched with the shape of the recessed area, and the light-reflecting structure is slidably fitted with the recessed area through the second reflection surface.

[0012] The first reflection surface includes a plurality of continuous bending planes, each of the bending planes is a reflection sub-plane, and the ambient light is reflected to the user's field of view after being reflected by at least two reflection sub-planes.

[0013] The electrophoretic display panel has a first central axis, the light-reflecting structure has a second central axis, in the rotation process, each of the second reflection surfaces forms a gap between the adjacent boundaries of each of the sub-pixels, and the homeostatic liquid and / or the ink liquid can reciprocally flow in the second direction in the area of the gap.

[0014] The overall shape of the light-reflecting structure is configured as any one of a prism, a pyramid or a hemisphere.

[0015] The projection area of the light-reflecting structure along the second direction is circular, and the shape of the sub-pixel is circumscribed to the circle.

[0016] The control method is applied to the electrophoretic display panel, and the control method comprises the following steps:

[0017] Obtaining user visual line information;

[0018] Obtaining user visual line data according to the user visual line information;

[0019] Controlling the direction and size of a horizontal electric field of the second substrate according to the user visual line data, wherein the horizontal electric field is used to drive the light-reflecting structure to deflect relative to a preset position area of the first substrate, and the deflection angle is consistent with the user visual line data.

[0020] Controlling the size of a vertical electric field between the first substrate and the second substrate, wherein the vertical electric field is used to drive the mutual movement between the ink liquid and the stabilizing liquid.

[0021] In the step of controlling the direction and size of the horizontal electric field of the second substrate according to the user visual line data, the following steps are included:

[0022] Different first voltage signals are applied to the first driving electrode and the second driving electrode of each sub-pixel of the second substrate, and a horizontal electric field along the first direction is formed between the first driving electrode and the second driving electrode of each sub-pixel.

[0023] In the step of controlling the direction and size of the horizontal electric field of the second substrate according to the user visual line data, the following steps are included:

[0024] A common voltage signal is applied to the common electrode of each sub-pixel of the first substrate, and a fourth voltage signal is applied to the third driving electrode of each sub-pixel of the second substrate, so as to form a vertical electric field between the third driving electrode and the common electrode of each sub-pixel.

[0025] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0026] The electrophoretic display panel and control method provided by the embodiments of the present application set a light reflection structure in the electrophoretic layer, form one horizontal electric field corresponding to each of the sub-pixels on the second substrate, and form a vertical electric field between the first substrate and the second substrate. The horizontal electric field and the vertical electric field are both along a preset direction. For example, considering the actual application scenario of the electrophoretic display panel, the horizontal electric field can be formed on the second substrate along a first direction, and the vertical electric field can be formed between the first substrate and the second substrate along a second direction. Under the action of the horizontal electric field, the light reflection structure can be deflected relative to a preset position area of the first substrate. The direction and angle of deflection of the light reflection structure are set to be consistent with user line-of-sight data. The user line-of-sight data can be understood as the line-of-sight angle of the user's gaze at the screen. In this way, as the angle of the user's gaze at the screen changes continuously, the horizontal electric field can drive the light reflection structure to deflect, and the direction and angle of deflection are consistent with the user's line of sight. As the light reflection structure deflects, the light exit side on the light reflection structure also deflects, which can enable more viewing angle ambient light to shine on the light exit side of the light reflection structure, thereby achieving a greater viewing angle observation effect. Under the joint action of the vertical electric field and the horizontal electric field, a greater viewing angle observation effect can be achieved, and the preset image or dynamic image effect of the display area can also be observed. Since the light reflection structure deflects following the user's line of sight, the effect that the viewing angle perception is consistent with the effect when viewed directly can also be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0029] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding thereto, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings do not constitute a proportional limitation.

[0030] Figure 1 A cross-sectional structure schematic diagram of the electrophoretic display panel provided by the embodiments of the present application (i.e., the layered structure arrangement between the sub-pixels of the electrophoretic display panel);

[0031] Figure 2The ambient light reflection path display of the light exit side of the reflective structure in a single sub-pixel of the electrophoretic display panel provided by the embodiment of the present application, and the state display of the ink liquid being located between the reflective structure and the second substrate;

[0032] Figure 3 The state display of the reflective structure in the electrophoretic display panel provided by the embodiment of the present application deflecting under the action of the horizontal electric field;

[0033] Figure 4 The color display state diagram of the ink liquid and the stabilizing liquid completely interchanging positions in the electrophoretic display panel provided by the embodiment of the present application;

[0034] Figure 5 The cross-sectional structure schematic diagram of the electrophoretic display panel along the thickness direction provided by the embodiment of the present application;

[0035] Figure 6 The orientation setting diagram of each driving electrode relative to the sub-pixel in the electrophoretic display panel provided by the embodiment of the present application;

[0036] Figure 7 The overall structure top view structure schematic diagram of the electrophoretic display panel provided by the embodiment of the present application.

[0037] Explanation of reference signs:

[0038] 1, first substrate; 2, second substrate; A, sub-pixel; 21, recessed area; 3, electrophoretic layer; 31, stabilizing liquid; 32, ink liquid; 4, reflective structure; 41, first reflection surface; 42, second reflection surface; 5, first driving electrode; 6, second driving electrode; 7, third driving electrode; 8, common electrode; 9, control system; 10, image acquisition device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0040] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the components and arrangements of the various examples are shown in the following description. It will be appreciated, however, that these are only examples and are not intended to limit the present application in any way. Moreover, the present application can be practiced with less than all of the components — including none — of the examples shown. Additionally, the present application can be practiced with more than all of the components — including none — of the examples shown. It is therefore intended that the present application not be limited to the examples and / or designs described in this disclosure, but rather that the disclosure be construed as the claims defined below.

[0041] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement condition of one element or feature with respect to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "above" another element or feature. Therefore, the example term "below" can include both the upper and lower positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptions used in the specification will be interpreted accordingly.

[0042] With the continuous change of display technology, the technology of LCD, OLED and CRT display tube gradually popularized, gradually, electronic paper, also known as electronic ink screen, became a unique existence. The essence of electronic paper is a thin piece of film, a layer of charged material, i.e. electronic ink, is "painted" on the film, and then a black technology using electrophoretic display technology (EPD) for color display can display content by reflecting ambient light. The display screen of traditional technology uses liquid crystal strong backlight, these light sources directly into the eyes, which is extremely easy to cause eye dryness and visual fatigue, and the blue light emitted by the display screen will cause eye problems, etc. The display screen of electronic paper does not need backlight at all, uses ambient light to hit on electronic paper, and then reflects light to the human eye, which is completely the same as the visual principle of traditional paper or objects in life. Therefore, the brighter the ambient light, the clearer the electronic paper is visible. Its advantages are environmental protection, saving paper, supporting unlimited repeated use, low power consumption, more energy saving, and more protection of vision.

[0043] The two core features of electronic paper include: first, paper-like display, not self-emitting, relying on ambient light reflection to present images, with good eye protection, full viewing angle and outdoor display; second, bistable, static picture 0 power consumption, contributing to the national double carbon goal. Especially under the condition of not needing power supply, the electronic paper display can still maintain the function of displaying the picture after power off.

[0044] Based on the advantages of the electronic paper, it is applied to various scenes, such as outdoor bus stop board, outdoor advertising sign, indoor display or terminal display, etc. Taking the application of the electronic paper technology in the terminal display field as an example, the existing electronic paper display panel, that is, the electrophoretic display panel, can only reflect the ambient light at a fixed angle in the application process. Therefore, the observation effect is best when the electronic paper is viewed directly, and the observation effect is gradually weakened with the increase of the angle when the electronic paper is viewed obliquely, which affects the user's viewing.

[0045] In order to alleviate the above problems, the present application provides an electrophoretic display panel with a light reflection structure with adjustable horizontal angle, which can deflect with the change of the user's line of sight. Since the light reflection structure is a whole structure, the side of the light reflection structure for reflecting ambient light also deflects during the deflection of the light reflection structure. Therefore, the original ambient light obliquely incident along the periphery of the screen can also form a direct viewing angle with the deflected light reflection structure, that is, the light reflection structure can always deflect with the user's line of sight, and the direct viewing effect of the ambient light can still be obtained after deflection. In this way, the user can also obtain the viewing effect when directly viewing the screen when not directly viewing the screen. At the same time, the display panel can also display images during the deflection of the light reflection structure while the user is viewing the screen.

[0046] Reference will be made to the following Figures 1-7 The electrophoretic display panel and the control method of the present application are further described.

[0047] The electrophoretic display panel provided by the embodiment of the present application comprises a first substrate 1, a second substrate 2 and an electrophoretic layer 3 between the two, the first substrate 1 comprises sub-pixels A arranged in an array and spaced from each other, the electrophoretic layer 3 comprises a stabilizing liquid 31 located in each sub-pixel A and an ink liquid 32 arranged below the stabilizing liquid 31 in layers; each sub-pixel A comprises at least one light reflection structure 4, the light reflection structure 4 is immersed in the stabilizing liquid 31 and the ink liquid 32, and the second substrate 2 forms a horizontal electric field corresponding to each sub-pixel A; the horizontal electric field is used to drive the light reflection structure 4 to deflect relative to a preset position region of the first substrate 1, and the direction and angle of deflection are consistent with the user's line of sight; on this basis, a vertical electric field corresponding to each sub-pixel A is formed between the first substrate 1 and the second substrate 2, and the vertical electric field is used to drive the ink liquid 32 and the stabilizing liquid 31 to move relative to each other to form a color developing region in which at least part of the ink liquid 32 is located between the first substrate 1 and the light reflection structure 4;

[0048] Exemplarily, the reflective structure 4 and the ink liquid 32 of the present application can be charged or not charged, when not charged, the driving of the electrophoretic particles in the reflective structure 4 or the ink liquid 32 is realized by the pressure difference in the electric field. Alternatively, exemplarily, the reflective structure 4 is more sensitive to the electric field (the voltage for controlling the deflection angle is set to 0-3V), and the ink liquid 32 is less sensitive to the electric field (the voltage for controlling the up-down movement is set to 10-20V, and the com voltage is 15V), so that the display function is performed first, and then the direction changing function is performed. The two functions are not performed at the same time to avoid mutual influence.

[0049] In this way, the reflective structure 4 is arranged in the electrophoretic layer 3, and the horizontal electric field corresponding to each sub-pixel A is formed in the second substrate 2, the horizontal electric field is arranged along the first direction, the vertical electric field corresponding to each sub-pixel A is formed between the first substrate 1 and the second substrate 2, and the vertical electric field is arranged along the second direction, wherein the first direction is the length direction of the display screen, and the second direction is the thickness direction of the display screen. The horizontal electric field and the vertical electric field in the present application can be controlled by the control system 9 respectively and run independently, or can be controlled by the control system 9 uniformly, exemplarily, can be performed at the same time, or can be performed according to the preset time interval or sequentially. If the combination operation is performed according to the preset time sequence, the present application does not limit the preset time sequence, as long as the direction and size of the horizontal electric field and the vertical electric field can be controlled by the control system 9 in real time.

[0050] Under the action of the horizontal electric field, the reflective structure 4 can be deflected relative to the preset position area of the second substrate 2; the direction and angle of deflection of the reflective structure 4 are set to be consistent with the user's line of sight data, wherein the user's line of sight data can be understood as the line of sight angle of the user's gaze position on the screen. In this way, as the user's gaze position on the screen changes continuously, the control system 9 controls the direction and size of the horizontal electric field, so that the horizontal electric field can drive the reflective structure 4 to deflect at different angles, and the different angles are consistent with the different angles of the user's gaze position on the screen.

[0051] In this way, as the reflective structure 4 deflects, the light exit side on the reflective structure 4 also deflects, which can make more ambient light in the horizontal angle shine on the light exit side of the reflective structure 4, thereby achieving a larger horizontal viewing angle observation effect, and since the reflective structure 4 deflects following the user's line of sight data, a consistent viewing effect at each angle can be achieved.

[0052] In the case that the deflection of the reflective structure 4 in the electrophoretic display panel is considered to follow the user's line of sight, the electrophoretic display panel further comprises a control system 9 and an image acquisition device 10 in this embodiment. The image acquisition device 10 is configured to acquire the user's line of sight information in real time and send the user's line of sight information to the control system 9. The control system 9 processes the user's line of sight information to obtain user's line of sight data, and adjusts the direction and size of the horizontal electric field according to the user's line of sight data.

[0053] For example, the image acquisition device 10 can be a camera device, such as a camera. The camera can be arranged on the first substrate 1. The present application does not limit the mounting method and position of the camera relative to the first substrate 1, as long as the user's line of sight can be acquired in real time.

[0054] For example, the camera can be used to acquire images or videos of the human eye. Then, the features of the human eye are extracted, such as locating key feature points and calculating relevant parameters. Then, the corresponding feature parameter data of the aforementioned human eye features are analyzed and processed to establish a motion model, calculate a gaze point, and identify a behavior. Finally, the operation is performed according to the analysis result and feedback is provided, and the tracking effect is adjusted and optimized according to the feedback. It can be understood that the user's line of sight information is processed to obtain user's line of sight data, and the control system 9 calculates the direction and size of the horizontal electric field according to the user's line of sight data. The direction and size of the horizontal electric field are the electric field forces required to drive the reflective structure 4 to deflect by a preset angle. The process of the control system 9 calculating the direction and size of the horizontal electric field according to the user's line of sight data is not limited in this embodiment. It can be directly obtained by model calculation, or it can be obtained by comprehensive calculation using different rule algorithms or combined with manual input data. As long as the control system 9 can control the direction and size of the horizontal electric field according to the user's line of sight data to drive the reflective structure 4 to deflect, and the direction and angle of deflection are consistent with the user's line of sight, it can be understood that the position after deflection can be perpendicular to the oblique screen.

[0055] Based on the aforementioned control method of the control system 9 for the horizontal electric field, the control system 9 can control the size of the vertical electric field independently. The direction of the vertical electric field is along a preset direction and is arranged in the form of an ITO layer between the first substrate 1 and the second substrate 2.

[0056] Based on the driving deflection characteristics of the horizontal electric field on the reflective structure 4, the direction of the horizontal electric field can be controlled by the chip, which can also be understood as the control system 9. For example, the direction of the horizontal electric field can be set in relation to the user's line of sight obtained in real time. The user's line of sight can be obtained by the image acquisition device 10, which can be a camera. The camera can send the obtained user's line of sight information to the chip, and the chip can control the direction and size of the horizontal electric field according to the user's line of sight information. In this way, the horizontal electric field in the preset direction can act on the reflective structure 4 and make the reflective structure 4 deflect. The deflected position can be perpendicular to the ambient light that is obliquely incident on the screen and the light exit side of the reflective structure 4.

[0057] Considering the way in which the control system 9 forms the horizontal electric field, in the electrophoretic display panel provided by the embodiment of the present application, the second substrate 2 is formed with a first driving electrode 5 and a second driving electrode 6 corresponding to each sub-pixel A. The first driving electrode 5 and the second driving electrode 6 are located on both sides of each sub-pixel A along the first direction. The control system 9 is used to control the voltage of the first driving electrode 5 and the second driving electrode 6 respectively, so as to form a horizontal electric field along the first direction.

[0058] For example, the first driving electrode 5 and the second driving electrode 6 are metal layers or metal wires formed on the second substrate 2 for current conduction, which can also be understood as resistance wires. The two driving electrodes are arranged in layers. Moreover, the first driving electrode 5 and the second driving electrode 6 are arranged on both sides of each sub-pixel A along the first direction respectively. Considering that a horizontal electric field needs to be formed between the two, the first driving electrode 5 and the second driving electrode 6 need to be arranged relatively and separately.

[0059] In this way, when a horizontal electric field along the first direction is formed between the first driving electrode 5 and the second driving electrode 6, the horizontal electric field can drive the reflective structure 4 to swing left and right along the first direction, so as to adapt to the change of the user's line of sight in a larger range of horizontal angle. The present application does not limit the angle range of the left and right swing of the reflective structure 4 along the first direction, and the actual application scene needs to be considered.

[0060] Considering that the user's line of sight can be at different angle positions on the screen, and the screen can still display images normally, that is, when the control system 9 forms the horizontal electric field, the control system 9 can also drive the ink liquid 32. The electric field for driving the ink liquid 32 is irrelevant to the horizontal electric field.

[0061] The electrophoretic display panel of the present application further comprises a third driving electrode 7 corresponding to each sub-pixel A formed on the second substrate 2, and a common electrode 8 corresponding to each sub-pixel A formed on the first substrate 1, and a control system 9 for controlling the voltage of the common electrode 8 and the third driving electrode 7 respectively, so that a vertical electric field is formed between the common electrode 8 and the third driving electrode 7, and the vertical electric field is used to drive the ink liquid 32 to move in the second direction, and the vertical electric field does not affect the horizontal electric field.

[0062] For example, the third driving electrode 7 is made of the same material as the first driving electrode 5 and the second driving electrode 6, and is a metal layer or a metal wire formed on the second substrate 2 for guiding the flow, and can also be understood as a resistance wire, and the three driving electrodes are arranged in layers. The third driving electrode 7 is used to form a vertical electric field between the common electrode 8 corresponding to each sub-pixel A. For example, the third driving electrode 7 is provided in multiple, and one third driving electrode 7 is provided corresponding to each sub-pixel A.

[0063] In this way, when different voltage signals are applied to the common electrode 8 of the first substrate 1 and the third driving electrode 7 of the second substrate 2 at the same time, a vertical electric field in the second direction will be formed between the common electrode 8 and the third driving electrode 7.

[0064] Further, when different currents are applied to the first driving electrode 5, the second driving electrode 6, and the third driving electrode 7 at the same time, the difference here can be only the difference in direction or only the difference in size, or also the difference in size and direction at the same time, and the horizontal electric field in the first direction and the vertical electric field in the second direction can exist at the same time. Because the ink liquid 32 and the reflective structure 4 have different sensitivities to the electric field, the reflective structure 4 has a higher sensitivity to the electric field, and the ink liquid 32 has a lower sensitivity to the electric field. Therefore, when the control system 9 controls the electric field, the electric field value of the horizontal electric field is smaller, and the electric field value of the vertical electric field is larger. The smaller horizontal electric field only acts on the reflective structure 4 and does not act on the ink liquid 32, and the larger vertical electric field only drives the ink liquid 32 to move through the pressure difference when the pressure difference is formed. Based on the direction perpendicular to the reflective structure 4, the vertical electric field does not affect the left and right swing of the reflective structure 4.

[0065] Considering that the electrophoretic display panel may have a screen black point problem in the application process, the present application further provides an electrophoretic display panel, which limits the reflective structure 4 to form a continuous reflection surface on the light-emitting side of the two adjacent reflective structures 4 in the deflection process. In this way, the ink liquid 32 below the reflective structure 4 can be prevented from appearing in the display area of the first substrate 1, so as to further avoid the black point problem in the display area of the electrophoretic display panel.

[0066] In this embodiment, during rotation, the light-emitting side of the adjacent two light-reflecting structures 4 forms a continuous reflecting surface along the irradiation direction of the ambient light at different angles. The ink liquid 32 between the adjacent two light-reflecting structures 4 will not appear in the display area of the first substrate 1.

[0067] In this way, the light-emitting side of the adjacent two light-reflecting structures 4 forms a continuous reflecting surface, so that the light-emitting side of the light-reflecting structure 4 rotated to any desired angle can be directly irradiated by the ambient light. Further, since each light-reflecting structure 4 is located in each different sub-pixel A, it can be understood that the light-reflecting structure 4 in the sub-pixel A of the screen position where the user's line of sight is directed follows the user's line of sight and deflects, and is always in a state where the light-emitting side of the light-reflecting structure 4 is directly irradiated by the user's line of sight. In this way, when the user looks at different positions on the screen, there is no blank position between the light-reflecting structures 4 between the adjacent two sub-pixels A, and the image displayed on the screen is caused by the ink liquid 32 above the light-reflecting structure 4, and has nothing to do with the ink liquid 32 below the light-reflecting structure 4. When the stabilizing liquid 31 is located above the light-reflecting structure 4 and the ink liquid 32 is located below the light-reflecting structure 4, when the user directs the line of sight at different position areas on the screen at different angles, the ink liquid 32 below the light-reflecting structure 4 is completely blocked by the light-reflecting structure 4, and no black dot image appears in the position area.

[0068] Considering the specific structure of the light-reflecting structure 4, in the electrophoretic display panel of the embodiment of the present application, the light-reflecting structure 4 is configured as a three-dimensional geometric shape enclosed by a first reflecting surface 41 and a second reflecting surface 42. The first reflecting surface 41 is arranged towards the first substrate 1, and the second reflecting surface 42 is arranged towards the second substrate 2. The second reflecting surface 42 of the light-reflecting structure 4 is used to slide against the surface of the second substrate 2, so that the light-reflecting structure 4 can swing relative to the preset position area of the second substrate 2.

[0069] For example, the three-dimensional geometric shape can be any one of a pyramid, a prism, or a hemisphere. The first reflecting surface 41 is the light-emitting side of the light-reflecting structure 4, and the second reflecting surface 42 is the back light side of the light-reflecting structure 4. The ambient light can be incident on the light-emitting side, part of the ambient light is directly reflected by the light-emitting side, and part of the ambient light is refracted into the light-reflecting structure 4 and continues to be reflected inside the second reflecting surface 42, and then is refracted out by the first reflecting surface 41. In this way, the light-reflecting structure 4 can achieve total internal reflection effect. In addition, the light-reflecting structure 4 slides against the surface of the first substrate 1 through the second reflecting surface 42, so that the light-reflecting structure 4 can swing relative to the preset position area of the first substrate 1. The sliding between the two can be achieved without the need for a structural connector, which can avoid unnecessary external force from driving the light-reflecting structure 4 by horizontal electric field.

[0070] The surface of the light reflection structure 4 reflects and refracts the ambient light through the first reflection surface 41, the light rays refracted into the light reflection structure 4 are reflected through the second reflection surface 42 and refracted through the first reflection surface 41, and then emitted to the user's line of sight, so as to improve the utilization rate of light.

[0071] When the light reflection structure 4 is deflected to a certain angle, the ambient light irradiated from the side cannot contact the first reflection surface 41 of the light reflection structure 4, but only contacts the second reflection surface 42 on the back side of the light reflection structure 4. The side of the second reflection surface 42 located inside the light reflection structure 4 can reflect light, and the side of the second reflection surface 42 located outside the light reflection structure 4 cannot reflect light, so ambient light cannot be reflected out of the second reflection surface 42. Therefore, the image on the electrophoretic display panel cannot be obtained at this angle, thereby achieving the function of preventing peeping. The application does not limit the setting range of the anti-peeping angle, and the specific application is subject to the actual application.

[0072] Considering the problem of position deviation when the light reflection structure 4 swings in the preset position area relative to the second substrate 2, in the electrophoretic display panel of the embodiment of the application, the surface of the second substrate 2 has a recessed area 21, the second reflection surface 42 is configured to have a curved surface shape matched with the shape of the recessed area 21, and the light reflection structure 4 is slidably matched with the recessed area 21 through the second reflection surface 42.

[0073] In this way, the light reflection structure 4 can be prevented from deviating from the recessed area 21 during swinging, and the light reflection structure 4 is slidably matched with the curved surface of the recessed area 21 in the limited area of each individual sub-pixel A. The deflection of the light reflection structure 4 to the left or right in the preset first direction is a deflection that can restore the initial position, and the problem of swinging misalignment does not occur.

[0074] For example, the recessed area 21 is a curved groove on the second substrate 2, and the curved groove is matched with the curved surface structure of the second reflection surface 42 of the light reflection structure 4. The application does not limit the specific shape, size and groove depth of the recessed area 21, and the specific application scenario is subject to the actual application.

[0075] Considering that part of the ambient light can be reflected back to the user's field of view after being reflected once after being incident on the first reflection surface 41 of the light reflection structure 4, in the electrophoretic display panel of the embodiment of the application, the first reflection surface 41 includes a plurality of bending planes arranged continuously, each bending plane is a reflection sub-plane, and the ambient light is reflected to the user's field of view after being reflected by at least two reflection sub-planes.

[0076] The embodiment of the present application does not limit the included angle of the bending plane relative to the screen, and the angle setting of the included angle is related to the angle range of the received ambient light. The shape and size of the bending plane are not limited, and the actual application scene requirements are used as the reference. Exemplarily, the bending plane can be a long strip structure, and the continuous bending plane forms a toothed structure surface on the light emitting side of the light reflection structure 4. In this way, the adjacent two bending planes can just reflect part of the ambient light into the user's line of sight twice, and the user can see the image of the position area as the light source.

[0077] Specifically, the electrophoretic display panel has a first central axis, the light reflection structure 4 has a second central axis, and the light reflection structure 4 has a first state and a second state during rotation. In the first state, the second central axis is parallel to the first central axis, and the vertical projection area of the first reflection surface 41 towards the second substrate 2 completely covers the underlying ink liquid 32. At this time, the user is in a state of looking at the screen, and at this moment, the ink liquid 32 located below the light reflection structure 4 is completely blocked by the light reflection structure 4 and will not appear as a black dot image on the screen. At the same time, in the second state, an included angle is formed between the second central axis and the first central axis, and a gap is formed between each second reflection surface 42 and the adjacent boundary of each sub-pixel A. The stable liquid 31 and / or the ink liquid 32 can reciprocate in the second direction in the gap area. In combination with the aforementioned condition that the light emitting side of the adjacent two light reflection structures 4 is a continuous reflection surface throughout the state, the light reflection structure 4 is limited to maintain the continuous reflection surface condition at any angle. Even if the light reflection structure 4 is rotated, no additional black dots will appear on the screen (it can also be understood that the ink liquid 32 located below the light reflection structure 4 will not appear on the screen).

[0078] Considering the shape of the sub-pixel A adapted by the light reflection structure 4 of the embodiment of the present application, in the electrophoretic display panel of the embodiment of the present application, the projection area of the light reflection structure 4 along the second direction is circular, the shape of the sub-pixel A is circumscribed to the circle, and is configured as a square structure with chamfered corners. The flow channel can be reserved for the ink liquid 32. Further, the shape of the sub-pixel A can match the first reflection surface 41 of the light reflection structure 4 of the present application, which can maximize the utilization of the total reflection area, can improve the pixel aperture ratio formed when the light reflection structure 4 is deflected, and can further facilitate the design of a larger pixel architecture space.

[0079] Exemplarily, the light reflection structure 4 can account for about 90% of the area of the sub-pixel A, and this value can be adjusted by increasing the surface shape of the light reflection structure 4 (the sub-pixel A can be configured as a square structure with chamfered corners on all four sides). The light utilization rate can be maximized.

[0080] When the user is looking at the electronic paper (i.e., the electrophoretic display panel), the reflective structure 4 in the sub-pixel A is symmetrically arranged inside the sub-pixel A, the horizontal reference surface of the first reflecting surface 41 of the reflective structure 4 is parallel to the screen surface of the first substrate 1, and the second substrate 2 (which can also be understood as a glass substrate) has a circular arc-shaped recess (i.e., the recessed area 21) that fits the lower surface (i.e., the second reflecting surface 42) of the reflective structure 4. The fitting here is understood as a sliding fit between the two. The recessed area 21 is set to limit the position of the reflective structure 4 in the sub-pixel A, preventing it from shifting and causing abnormal reflection or display abnormalities.

[0081] When the human eye needs to look at the electronic paper from the side, the camera below the electronic paper detects the movement of the human eye, and then sends a command to the control system 9 to control the voltage distribution of the ITO (i.e., the driving electrode) on the second substrate 2 to control the deflection of the reflective structure 4 in the first direction, thereby achieving the effect of human eye tracking of the electrophoretic display panel.

[0082] When a black state image needs to be displayed, a signal is sent to the corresponding ITO (i.e., the driving electrode) to form a horizontal electric field and a vertical electric field, attracting the black ink to move upwards and exchange positions with the stabilizing liquid 31, covering the reflective structure 4 and absorbing external light to form a black state image.

[0083] Since the ink liquid 32 and the reflective structure 4 need to be driven separately during display, special ITO pattern settings are required to prevent them from conflicting with each other during operation. At the same time, based on the principle of non-conflict, the voltage size and polarity of the ink liquid 32 and the reflective structure 4 are also different. For example, the reflective structure 4 is very small and is easily attracted by the electric field (but is less sensitive to the electric field than black ink), and is positively charged. The black ink is not charged and moves up and down depending on the voltage difference between the upper and lower substrates. In addition, the black ink and the stabilizing liquid 31 are not mutually soluble and have different densities (black ink density > stabilizing liquid 31 density).

[0084] For example, when a bright state image needs to be displayed (at this time, the ink liquid 32 is above the reflective structure 4), assuming that the ink liquid 32 is negatively charged, the upper common electrode 9 is connected to a 15V voltage, and the lower third driving electrode 7 is connected to a 20V voltage (this voltage size can be adjusted according to the required gray scale, the lighter the gray scale, the higher the voltage, and vice versa), at this time the electric field direction in the display screen application state is shown as the direction from the bottom to the top of the screen, and the negative particles move against the electric field direction, thereby the ink liquid 32 moves to the bottom of the reflective structure 4 through the gap between the reflective structure 4 and the boundary of each sub-pixel A (i.e., moves from the front side to the back side of the screen), displaying a bright state image, thereby the ink liquid 32 is blocked by the reflective structure 4, solving the problem of black spots after ink shrinkage.

[0085] When the light-reflecting structure 4 is deflected to a certain angle along the horizontal direction, the ambient light irradiated from the side will not be able to contact the first reflecting surface 41 of the light-reflecting structure 4, but only the back light-reflecting surface 42 of the light-reflecting structure 4, and the side of the second reflecting surface 42 located inside the light-reflecting structure 4 cannot reflect light after being reversed, or in other words, the light refracted into the light-reflecting structure by the second reflecting surface 42 cannot be reflected back to the user's line of sight, and the ambient light cannot be reflected out of the second reflecting surface 42, so the image on the electrophoretic display panel cannot be obtained at this angle, and the privacy protection function can be achieved.

[0086] In specific work, when the bright state is to be displayed and the user's visual angle is to be followed, the common electrode 8 on the first substrate 1 and the first driving electrode 5, the second driving electrode 6 and the third driving electrode 7 on the second substrate 2 are turned on, and for example, when facing the screen, the driving electrodes on the left and right sides of each sub-pixel A are supplied with negative electricity to attract the light-reflecting structure 4 to tilt left or right; when displaying the black state, the tilt direction of the light-reflecting structure 4 at this time does not need to be concerned, and the first driving electrode 5 and the second driving electrode 6 on the periphery of the second substrate 2 are directly turned off, and for example, the driving electrodes on the left or right side of the sub-pixel A are turned on, and the third driving electrode 7 on the second substrate 2 and the upper common electrode 8 are turned on. The voltage of the common electrode 8 does not change, and the voltage difference is changed according to the voltage supplied to the third driving electrode 7 to control the displacement distance of the black ink.

[0087] The electrophoretic display panel of the present application adopts an electronic ink screen, which can achieve the effect of screen resolution of facing the screen within the horizontal angle range under the application of the new control method and structure, and can also avoid unnecessary black dot images within the horizontal angle range.

[0088] The embodiment of the present application provides a control method, which can be applied to the electrophoretic display panel and achieve the same effect as the electrophoretic display panel.

[0089] The control method provided by the embodiment of the present application comprises:

[0090] Obtaining user visual line information;

[0091] Obtaining user visual line data according to the user visual line information;

[0092] Controlling the direction and size of a horizontal electric field of the second substrate 2 according to the user visual line data, the horizontal electric field being used to drive the light-reflecting structure 4 to deflect relative to a preset position area of the first substrate 1, and the deflection angle being consistent with the user visual line data;

[0093] The magnitude of the vertical electric field between the first substrate 1 and the second substrate 2 is controlled, and the vertical electric field is used to drive the mutual movement between the ink liquid 32 and the stabilizing liquid 31.

[0094] In this way, the control system 9 can obtain the user's line of sight in real time, and the real-time user's line of sight information can be processed to obtain user's line of sight data. For example, the user's line of sight data can be angle, position, direction, and other vector information. The control system 9 calculates the direction and magnitude of the horizontal electric field required to deflect the light-reflecting structure 4 to the preset angle according to the user's line of sight data, and then controls the direction and magnitude of the horizontal electric field. In this way, the effect of human eye tracking can be achieved, so that the light-reflecting structure 4 swings along with the change of the user's line of sight, and then the light-reflecting structure 4 in any user's line of sight gaze area can be deflected to a state of being directly opposite to the user's line of sight angle. At this time, the light-reflecting structure 4 can also have enough reflected ambient light, and the vertical electric field can drive the ink liquid 32 to move, so that the image can be clearly seen, which is consistent with the effect of the user looking directly at the screen.

[0095] Considering the scheme in which the control system 9 forms the horizontal electric field in the first direction through the control circuit, the control system 9 of the present application applies different first voltage signals to the first driving electrode 5 and the second driving electrode 6 of each sub-pixel A of the second substrate 2, respectively, and forms a horizontal electric field in the first direction between the first driving electrode 5 and the second driving electrode 6 of each sub-pixel A. In this way, the horizontal electric field can act on the light-reflecting structure 4 to make it swing left and right in the first direction.

[0096] Considering the scheme in which the control system 9 forms the vertical electric field through the control circuit, the control system 9 of the present application applies a common voltage signal to the common electrode 8 of each sub-pixel A of the first substrate 1, and applies a fourth voltage signal to the third driving electrode 7 of each sub-pixel A of the second substrate 2, so as to form a vertical electric field between the third driving electrode 7 and the common electrode 8 of each sub-pixel A. In this way, the vertical electric field can act on the ink liquid 32 to make it reciprocate in the front and back directions along the gap region between the light-reflecting structure 4 and the sub-pixel A boundary in the second direction.

[0097] Assuming that the user is on the left side of the screen to watch, under the control of the human eye tracking function, the need for light reflecting structure 4 to move to the positive direction of the Y axis (i.e. the second direction), set the light reflecting structure 4 also with negative electricity (this design helps to prevent the same charge of ink residue on the surface of the light reflecting structure 4, causing ink residue problems). At this time, three deflection signal lines (i.e. corresponding to the three driving electrodes) will be opened, respectively giving the first driving electrode 5 and the second driving electrode 6 two different voltages, so that the horizontal electric field along the first direction between the first driving electrode 5 and the second driving electrode 6 can be formed, which is used to drive the deflection of the horizontal angle of the light reflecting structure 4. Respectively giving the third driving electrode 7 and the common electrode 8 two different voltages, so that the vertical electric field along the second direction between the third driving electrode 7 and the common electrode 8 can be formed, which is used to drive the mutual movement between the ink liquid 32 and the stabilizing liquid 31, and the moving direction is along the second direction.

[0098] In summary, the electrophoretic display panel and the control method of the application can achieve the deflection of the light reflecting structure 4 to change following the change of the user's line of sight, and the light reflecting structure 4 in each sub-pixel A can achieve this effect. The light reflecting structure 4 applied to the first reflecting surface 41 with a continuous bending plane, i.e. the film with a prism structure as a reflecting surface, will swing according to the change of the horizontal electric field in each sub-pixel A to achieve the effect of reflecting the ambient light of different angles at the original angle. The human eye tracking system formed between the image acquisition device 10 and the control system 9 can realize the effect of the light reflecting structure 4 following the movement of the human eye, so that the user can obtain a larger viewing angle of the horizontal angle and can have a viewing angle close to 180°. Each sub-pixel A has a light reflecting structure 4, and each light reflecting structure 4 is circumscribed in the inner wall of the corresponding sub-pixel A, so that more reflecting microstructures can be set. Compared with the traditional structure of the light reflecting electronic paper, more light will be reflected in the original light path direction, increasing the screen brightness. At the same time, the light refracted into the light reflecting structure 4 will also form total internal reflection at the bottom of the light reflecting structure 4 (i.e. the second reflecting surface 42) and be reflected out, improving the light utilization rate. In addition, the square structure with chamfered corners around the sub-pixel A can leave a channel for the ink liquid 32 to flow.

[0099] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0100] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0101] The above descriptions are only specific embodiments of the application to enable a person skilled in the art to understand or implement the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features sought to be applied herein.

Claims

1. An electrophoresis display panel, comprising: The first substrate (1), the second substrate (2) and the electrophoretic layer (3) between them are characterized in that the first substrate (1) includes sub-pixels (A) arranged in an array and spaced apart from each other. The electrophoretic layer (3) includes a stabilizing liquid (31) located in each of the sub-pixels (A) and an ink liquid (32) layered below the stabilizing liquid (31). Each sub-pixel (A) includes at least one reflective structure (4), which is immersed in the stabilizing liquid (31) and the ink liquid (32). The second substrate (2) forms a horizontal electric field corresponding to each sub-pixel (A). The horizontal electric field is used to drive the reflective structure (4) to deflect relative to a preset position area of ​​the first substrate (1), and the direction and angle of the deflection are consistent with the user's line of sight. A vertical electric field corresponding to each of the sub-pixels (A) is formed between the first substrate (1) and the second substrate (2). The vertical electric field is used to drive the ink liquid (32) and the stabilizing liquid (31) to move relative to each other, so as to form at least a portion of the ink liquid (32) located in the color-developing area between the first substrate (1) and the reflective structure (4). The reflective structure (4) is constructed as a three-dimensional geometric shape enclosed by a first reflective surface (41) and a second reflective surface (42). The first reflective surface (41) is disposed facing the first substrate (1), and the second reflective surface (42) is disposed facing the second substrate (2). The second reflective surface (42) of the reflective structure (4) is used to slide relative to the surface of the second substrate (2) so that the reflective structure (4) can swing relative to a preset position area of ​​the second substrate (2).

2. The electrophoretic display panel according to claim 1, characterized in that, The electrophoresis display panel also includes a control system (9) and an image acquisition device (10). The image acquisition device (10) is used to acquire user gaze information in real time and send the user gaze information to the control system (9). The control system (9) processes the user gaze information to obtain user gaze data. The control system (9) adjusts the direction and magnitude of the horizontal electric field according to the user gaze data.

3. The electrophoretic display panel according to claim 2, characterized in that, The second substrate (2) is formed with a first driving electrode (5) and a second driving electrode (6) corresponding to each sub-pixel (A), the first driving electrode (5) and the second driving electrode (6) being located on both sides of each sub-pixel (A) along a first direction; the control system is used to control the voltage of the first driving electrode (5) and the second driving electrode (6) respectively to form the horizontal electric field along the first direction, the first direction being the length direction of the display screen.

4. The electrophoretic display panel according to claim 3, characterized in that, The second substrate (2) is further formed with a third driving electrode (7) corresponding to each of the sub-pixels (A), and the first substrate (1) is formed with a common electrode (8) corresponding to each of the sub-pixels (A). The control system controls the voltage of the common electrode (8) and the third driving electrode (7) respectively, so that the vertical electric field is formed between them. The vertical electric field is used to drive the ink liquid (32) to move along the second direction. The vertical electric field and the horizontal electric field do not affect each other. The second direction is the thickness direction of the display screen.

5. The electrophoretic display panel according to claim 4, characterized in that, During rotation, the reflective structure (4) forms a continuous reflective surface on the light-emitting side of two adjacent reflective structures (4) along different angles of ambient light illumination. The ink liquid (32) located below the two adjacent reflective structures (4) will not appear in the display area of ​​the first substrate (1).

6. The electrophoretic display panel according to claim 1, characterized in that, The surface of the second substrate (2) has a recessed area (21), and the second reflective surface (42) is constructed as a curved shape that matches the shape of the recessed area (21). The reflective structure (4) slides with the recessed area (21) through the second reflective surface (42).

7. The electrophoretic display panel according to claim 1, characterized in that, The first reflective surface (41) includes a plurality of continuously arranged bent planes, each of which is a reflective sub-plane. Ambient light is reflected to the user's field of vision after being reflected by at least two of the reflective sub-planes.

8. The electrophoretic display panel according to claim 7, characterized in that, The electrophoretic display panel has a first central axis, and the reflective structure (4) has a second central axis. During the rotation of the reflective structure (4), a gap is formed between each of the second reflective surfaces (42) and the adjacent boundary of each of the sub-pixels (A). The stabilizing liquid (31) and / or the ink liquid (32) flow back and forth in the region of the gap in a second direction, which is the thickness direction of the display screen.

9. The electrophoretic display panel according to claim 7, characterized in that, The overall shape of the reflective structure (4) is any one of prism, pyramid or hemisphere.

10. The electrophoretic display panel according to claim 2, characterized in that, The projection area of ​​the reflective structure (4) along the second direction is circular, and the shape of the sub-pixel (A) is externally tangent to the circle, and is constructed as a square structure with chamfered corners; the second direction is the thickness direction of the display screen.

11. A control method applied to an electrophoretic display panel as described in any one of claims 1-10, characterized in that, The control method includes: Obtain user gaze information; User gaze data is obtained based on the user gaze information; According to the user's line of sight data, the direction and magnitude of a horizontal electric field of the second substrate (2) are controlled. The horizontal electric field is used to drive the reflective structure (4) to deflect relative to the preset position area of ​​the first substrate (1). The direction and angle of the deflection are consistent with the user's line of sight data. The magnitude of the vertical electric field between the first substrate (1) and the second substrate (2) is controlled, and the vertical electric field is used to drive the ink liquid (32) and the stabilizing liquid (31) to move relative to each other.

12. The control method according to claim 11, characterized in that, The step of controlling the direction and magnitude of a horizontal electric field of the second substrate (2) based on the user's line-of-sight data includes: Different first voltage signals are applied to the first driving electrode (5) and the second driving electrode (6) of each sub-pixel (A) of the second substrate (2), and a horizontal electric field is formed between the first driving electrode (5) and the second driving electrode (6) of each sub-pixel (A) along a first direction, which is the length direction of the display screen.

13. The control method according to claim 12, characterized in that, The step of controlling the magnitude of the vertical electric field between the first substrate (1) and the second substrate (2) further includes: A common voltage signal is applied to the common electrode (8) of each sub-pixel (A) of the first substrate (1), and a fourth voltage signal is applied to the third driving electrode (7) of each sub-pixel (A) of the second substrate (2), so that a vertical electric field is formed between the third driving electrode (7) of each sub-pixel (A) and the common electrode (8).

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