Electronic paper display panel and preparation method and driving method thereof, display device

Abstract

The application provides an electronic paper display panel, which comprises a driving back plate, a latching substrate and electrophoretic liquid, the driving back plate is arranged in latching mode with the latching substrate, and the electrophoretic liquid is accommodated in the latching gap between the driving back plate and the latching substrate; the driving back plate comprises a substrate, a plurality of sub-pixels, the plurality of sub-pixels are located on one side of the substrate, the sub-pixel comprises a first electrode, a second electrode and a first insulating layer, the first electrode, the first insulating layer and the second electrode are sequentially and distantly stacked away from the substrate, the latching substrate comprises a first base and a third electrode, the third electrode is located on the side of the first base close to the driving back plate, a first hollow pattern is arranged in the second electrode, and the orthographic projection of the second electrode and the first hollow pattern on the substrate overlaps the orthographic projection of the first electrode, the first insulating layer and the third electrode on the substrate. The electronic paper display panel, the electric field is no longer single, the display gray scale adjustment dimension is increased, and the display brightness and display effect are good.

Description

Technical Field

[0001] This invention belongs to the field of display technology, specifically relating to an electronic paper display panel, its preparation method and driving method, and a display device. Background Technology

[0002] Electronic paper display technology has advantages over mainstream display technologies such as LCD and OLED (Organic Light-Emitting Diode) in terms of low power consumption and eye protection. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an electronic paper display panel, its fabrication method, driving method, and display device. This electronic paper display panel achieves a more diversified electric field implementation, increases the dimensions of grayscale adjustment, and improves display brightness and overall display effect.

[0004] This invention provides

[0005] Electronic paper display panel, including driving backplane, cell substrate and electrophoretic solution,

[0006] The driving back plate is disposed in conjunction with the matching substrate, and the electrophoretic liquid is contained in the gap between the driving back plate and the matching substrate.

[0007] The driving backplane includes a substrate and a plurality of sub-pixels, the plurality of sub-pixels being located on one side of the substrate.

[0008] The sub-pixel includes a first electrode, a second electrode, and a first insulating layer, wherein the first electrode, the first insulating layer, and the second electrode are stacked sequentially away from the substrate.

[0009] The substrate includes a first substrate and a third electrode, wherein the third electrode is located on the side of the first substrate closer to the driving backplate.

[0010] The second electrode has a first hollowed-out pattern.

[0011] The orthographic projections of the second electrode and the first hollow pattern on the substrate overlap with the orthographic projections of the first electrode, the first insulating layer, and the third electrode on the substrate.

[0012] Optionally, the sub-pixel further includes a second insulating layer located on the side of the first insulating layer facing away from the substrate and on the side of the second electrode close to the substrate.

[0013] The second insulating layer has a second hollow pattern.

[0014] The orthographic projection of the second cutout pattern on the substrate coincides with the orthographic projection of the first cutout pattern on the substrate.

[0015] Optionally, the first perforated pattern is evenly distributed in the second electrode.

[0016] Optionally, the orthographic projection shape of the first perforated pattern on the substrate includes any one of the following shapes: bar, "wood" shape, cross shape, ring shape, and fence shape.

[0017] Optionally, the second electrode is made of a reflective metallic material.

[0018] Optionally, the cell substrate further includes a color filter layer located on the side of the third electrode closer to the first substrate.

[0019] The color filter layer includes a black matrix, a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters, wherein the black matrix is ​​located between any two adjacent first color filters, second color filters, and third color filters;

[0020] The first, second, and third color resists are different colors.

[0021] The orthographic projections of the first color resist, the second color resist, and the third color resist on the driving backplate respectively cover different sub-pixels.

[0022] Optionally, a first color resist, a second color resist, and a third color resist constitute a group.

[0023] The first color resist, the second color resist, and the third color resist in a group are arranged adjacent to each other along a first direction.

[0024] Optionally, the electrophoretic solution comprises black charged particles and white charged particles.

[0025] The black charged particles and the white charged particles have opposite polarities of charge.

[0026] Optionally, the plurality of sub-pixels are arranged in an array.

[0027] The driving backplate also includes a baffle wall located between any two adjacent sub-pixels, and the baffle wall is in contact with and connected to the surface of the substrate near the first electrode;

[0028] The distance between the side surface of the retaining wall facing away from the substrate and the substrate is greater than the distance between the side surface of the second electrode facing away from the substrate and the substrate.

[0029] One end of the barrier wall away from the substrate contacts and connects to the matching substrate to divide the matching gap between the matching substrate and the drive back plate into multiple sub-chambers.

[0030] The three sub-chambers that are sequentially adjacent along the first direction are designated as the first sub-chamber, the second sub-chamber, and the third sub-chamber.

[0031] The electrophoretic solution in the first sub-chamber comprises charged particles of a first color and black charged particles; the charged particles of the first color and the black charged particles have opposite polarities of charge.

[0032] The electrophoretic solution in the second sub-chamber comprises charged particles of a second color and black charged particles; the charged particles of the second color and the black charged particles have opposite polarities of charge.

[0033] The electrophoretic solution in the third sub-chamber includes charged particles of a third color and black charged particles; the charged particles of the third color and the black charged particles have opposite polarities of charge.

[0034] The first color, the second color, and the third color are different and all are not black.

[0035] Optionally, the orthographic projection of the third electrode onto the driving backplate covers the plurality of sub-pixels;

[0036] Alternatively, the third electrode may include a plurality of sub-electrodes, the orthographic projections of which on the driving backplane cover the plurality of sub-pixels.

[0037] This invention also provides a display device, including the electronic paper display panel described above.

[0038] The present invention also provides a method for preparing the above-mentioned electronic paper display panel, comprising: preparing a driving backplate;

[0039] Preparation of a cell substrate;

[0040] Electrophoretic solution is dripped or spin-coated onto the cell-matching surface of the drive backplate and the cell-matching substrate;

[0041] The drive backplate that has completed the above steps is then paired with the matching substrate.

[0042] The present invention also provides a driving method for the above-mentioned electronic paper display panel, comprising: applying different voltages to the first electrode and the second electrode in the driving back plate of the electronic paper display panel and to the third electrode in the cell substrate, respectively, driving two charged particles of different colors in the electrophoretic solution to move toward the light-emitting side and the side opposite to the light-emitting side of the electronic paper display panel, thereby realizing the display of the electronic paper display panel.

[0043] Optionally, a first voltage is applied to the first electrode, a second voltage is applied to the second electrode, and a third voltage is applied to the third electrode.

[0044] When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a white display is achieved;

[0045] When the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved;

[0046] When the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, the reflection display of the second electrode is realized.

[0047] Optionally, a first voltage is applied to the first electrode, a second voltage is applied to the second electrode, and a third voltage is applied to the third electrode.

[0048] When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, the first color, the second color, or the third color can be displayed.

[0049] When the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved;

[0050] When the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, the reflection display of the second electrode is realized.

[0051] Optionally, the magnitude or duration of the voltage applied to the first electrode, the second electrode, and the third electrode can be controlled to be different, thereby achieving different grayscale displays on the electronic paper display panel.

[0052] The beneficial effects of this invention are as follows: The electronic paper display panel provided by this invention, by setting first and second electrodes located in different layers in the driving backplate, can form a horizontal electric field between the first and second electrodes, compared with the electronic paper display structure in the related art. This horizontal electric field, together with the vertical electric field between the first and second electrodes and the third electrode, can drive the movement of charged particles in the electrophoretic solution. This results in a more complex electric field for the electronic paper display panel, thereby increasing the grayscale adjustment dimension of the electrophoretic solution in the electronic paper display panel. The charged particles in the electrophoretic solution move within both the vertical and horizontal electric fields. The response time of movement under the action of an electric field is accelerated; in addition, by opening a first hollow pattern in the second electrode, most or all of the charged particles gathered in the electrophoretic liquid on the side where the driving back plate is located can move into the first hollow pattern under the action of the horizontal electric field formed between the first electrode and the second electrode, thereby exposing the side surface of the second electrode away from the substrate, and thus enabling the side surface of the second electrode away from the substrate to reflect the ambient light irradiated onto it through the substrate, thereby improving the reflectivity of the electronic paper display panel to ambient light, improving the display brightness of the electronic paper display panel, and improving the display effect of the electronic paper display panel.

[0053] The display device provided by the present invention, by employing the electronic paper display panel in the above embodiments, enables the display device to display an electric field that is no longer singular, thereby increasing the grayscale adjustment dimension of the display device. In addition, it can also improve the reflectivity of the display device to ambient light, improve the display brightness of the display device, and improve the display effect of the display device. Attached Figure Description

[0054] Figure 1a This is a cross-sectional schematic diagram of an electronic paper display structure in related technologies;

[0055] Figure 1b This is a cross-sectional schematic diagram of another electronic paper display structure in related technologies;

[0056] Figure 2a This is a top view schematic diagram of the drive backplate structure in an embodiment of the present invention;

[0057] Figure 2b For along Figure 2a A structural cross-sectional view of the AA section line;

[0058] Figure 2c This is a top view schematic diagram of the structure of the second electrode in an embodiment of the present invention;

[0059] Figure 2d For along Figure 2a Another structural cross-sectional view of the AA section line;

[0060] Figure 2e For along Figure 2a Schematic diagram of the structural cross-section along the BB section line;

[0061] Figure 3a This is a cross-sectional view of an electronic paper display panel in an embodiment of the present invention;

[0062] Figure 3b This is a cross-sectional view of another structure of the electronic paper display panel in an embodiment of the present invention;

[0063] Figure 3c This is a cross-sectional view of another structure of the electronic paper display panel in an embodiment of the present invention;

[0064] Figure 4a This is a schematic diagram illustrating the principle of an electronic paper display panel achieving white display in an embodiment of the present invention;

[0065] Figure 4b This is a top view schematic diagram of a structure for driving the back panel side when the electronic paper display panel achieves white display in an embodiment of the present invention;

[0066] Figure 4c This is a schematic diagram illustrating another principle of how the electronic paper display panel achieves white display in an embodiment of the present invention;

[0067] Figure 4d This is a top view schematic diagram of another structure for driving the back panel side when the electronic paper display panel achieves white display in an embodiment of the present invention;

[0068] Figure 4e This is a schematic diagram illustrating the principle of black display on the electronic paper display panel in an embodiment of the present invention.

[0069] The reference numerals in the attached figures are:

[0070] 1. Substrate; 2. Subpixel; 21. First electrode; 22. Second electrode; 220. First cutout pattern; 23. First insulating layer; 24. Second insulating layer; 240. Second cutout pattern; 3. Barrier; 4. Cell substrate; 41. First base; 42. Third electrode; 43. Color filter layer; 430. Black matrix; 431. First color resist; 432. Second color resist; 433. Third color resist; 5. Electrophoretic solution; 6. Driving backplate; 101. First sub-chamber; 102. Second sub-chamber; 103. Third sub-chamber; 7. Capsule-shaped electrophoretic solution container structure; 8. Microcup-shaped electrophoretic solution container structure; 61. Lower electrode; 40. Upper electrode. Detailed Implementation

[0071] To enable those skilled in the art to better understand the technical solution of the present invention, the following describes in further detail an electronic paper display panel, its preparation method, driving method, and display device, in conjunction with the accompanying drawings and specific embodiments.

[0072] The electronic paper display structure consists of an electronic paper film sandwiched between a driving backplate and a substrate. The electronic paper film contains an electrophoretic solution containing black and white charged particles, which are positively and negatively charged, respectively. A lower electrode is located in the driving backplate, and an upper electrode is located in the substrate. A vertical electric field, provided by the energized upper and lower electrodes, causes the black and white charged particles to move vertically under the influence of the electric field. When the black charged particles are distributed on one side of the electronic paper display structure's field of view, it is a black display; when the white charged particles are distributed on the other side, it is a white display.

[0073] In related technologies, the electronic paper film in an electronic paper display structure contains a capsule-shaped electrophoretic liquid containment structure, such as... Figure 1a As shown; there are also microcup-shaped electrophoresis solution containers, such as Figure 1b As shown; the electrophoresis solution container structure contains the electrophoresis solution. Figure 1a As shown, the electronic paper membrane is formed by arranging multiple capsule-shaped electrophoretic solution containment structures 7; as Figure 1b As shown, the electronic paper film is formed by arranging multiple microcup-shaped electrophoretic liquid containing structures 8. The upper and lower sides of the electronic paper film are respectively provided with a substrate 4 and a driving back plate 6. The driving back plate 6 is provided with multiple sets of lower electrodes 61, each set of lower electrodes 61 including one or more electrodes. The multiple electrodes are arranged in the same layer. Each set of lower electrodes 61 drives the electrophoretic liquid 5 in a capsule or microcup. When the lower electrodes 61 in the driving back plate 6 and the upper electrodes 40 in the substrate 4 are energized, they provide a vertical electric field, driving the black and white charged particles in the electrophoretic liquid 5 to move vertically, thereby realizing the black and white display of the electronic paper display structure.

[0074] The grayscale display in an electronic paper display structure is achieved by the degree of aggregation of black and white charged particles on four sides of the substrate. The more black charged particles aggregate on the four sides of the substrate, the lower the display brightness; the more white charged particles aggregate on the four sides of the substrate, the higher the display brightness.

[0075] In related technologies, whether the electronic paper display structure is based on the capsule-shaped electrophoretic liquid container structure 7 or the microcup-shaped electrophoretic liquid container structure 8, the driving process involves providing a driving voltage signal to each group of lower electrodes and simultaneously providing a voltage signal to the upper electrode, thereby driving the movement of black and white charged particles in the electrophoretic liquid 5 in each capsule or microcup to achieve the display of the electronic paper display structure.

[0076] In the related technologies, the driving schemes for electronic paper display structures have limitations. On the one hand, the electric field is limited, and the improvement of grayscale and reflectivity is restricted. On the other hand, since the display principle of charged particles in electrophoretic liquid is different from that of traditional liquid crystal and OLED display, the current driving schemes for electronic paper display structures usually cannot effectively utilize the horizontal electric field generated by the lower electrode, resulting in disadvantages such as small grayscale adjustment dimension and slow response time in electrophoretic display.

[0077] To address the aforementioned problems in existing electronic paper display structures, embodiments of the present invention provide an electronic paper display panel, such as... Figure 2a , Figure 2b , Figure 2c and Figure 3a As shown, the device includes a driving backplate 6, a cell-mounting substrate 4, and an electrophoretic solution 5. The driving backplate 6 and the cell-mounting substrate 4 are aligned and disposed together. The electrophoretic solution 5 is contained in the gap between the driving backplate 6 and the cell-mounting substrate 4. The driving backplate includes a substrate 1 and a plurality of sub-pixels 2. The plurality of sub-pixels 2 are located on one side of the substrate 1. The sub-pixels 2 include a first electrode 21, a second electrode 22, and a first insulating layer 23. The first electrode 21, the first insulating layer 23, and the second electrode 22 are stacked sequentially away from the substrate 1. The cell-mounting substrate 4 includes a first base 41 and a third electrode 42. The third electrode 42 is located on the side of the first base 41 closer to the driving backplate 6. A first hollow pattern 220 is formed in the second electrode 22. The orthographic projection of the second electrode 22 and the first hollow pattern 220 on the substrate 1 overlaps with the orthographic projection of the first electrode 21, the first insulating layer 23, and the third electrode 42 on the substrate 1.

[0078] The first perforated pattern 220 refers to a pattern that penetrates the thickness of the second electrode 22, meaning that the first insulating layer 23 is exposed at the first perforated pattern 220. The first insulating layer 23 is disposed between the first electrode 21 and the second electrode 22. Applying different voltages to the first electrode 21 and the second electrode 22 can create a horizontal electric field between them, or an electric field that can be decomposed into a horizontal direction. A vertical electric field can be formed between the first electrode 21 and the second electrode 22 in the drive backplate 6 and the third electrode 42 in the substrate 4. This horizontal and vertical electric fields together drive the movement of charged particles in the electrophoresis solution 5.

[0079] In this embodiment, the electronic paper display panel, by setting first electrodes 21 and second electrodes 22 located on different layers in the driving backplate, can form a horizontal electric field between the first electrodes 21 and second electrodes 22, compared to electronic paper display structures in related technologies. This horizontal electric field, together with the vertical electric field, drives the movement of charged particles in the electrophoretic solution 5. This results in a more complex electric field distribution within the electronic paper display panel, increasing the grayscale adjustment dimension of the electrophoretic solution 5 and accelerating the response time of the charged particles in the electrophoretic solution 5 under the influence of both the vertical and horizontal electric fields. Furthermore... By creating a first perforated pattern 220 in the second electrode 22, most or all of the charged particles in the electrophoretic liquid 5 that are concentrated on the side where the driving back plate 6 is located can move into the first perforated pattern 220 under the action of the horizontal electric field formed between the first electrode 21 and the second electrode 22. This exposes the side surface of the second electrode 22 that is away from the substrate 1, thereby enabling the side surface of the second electrode 22 that is away from the substrate 1 to reflect ambient light that is irradiated onto it through the substrate 4, thereby improving the reflectivity of the electronic paper display panel to ambient light, increasing the display brightness of the electronic paper display panel, and improving the display effect of the electronic paper display panel.

[0080] In some embodiments, the first perforated pattern 220 is uniformly distributed in the second electrode 22. That is, the second electrode 22 is a planar electrode, and the first perforated pattern 220 can be a plurality of through holes uniformly distributed in the planar electrode, penetrating its thickness, and the opening shape of the through holes can be arbitrary. This arrangement ensures that the horizontal electric field formed between the first electrode 21 and the second electrode 22 is as uniform as possible, thereby ensuring that the charged particles gathered in the electrophoretic liquid 5 on the side where the driving backplate 6 is located can be uniformly filled into the first perforated pattern 220 under the action of the horizontal electric field formed between the first electrode 21 and the second electrode 22. This allows the surface of the second electrode 22 facing away from the substrate 1 to reflect ambient light transmitted through the substrate 4, thereby improving the reflectivity of the electronic paper display panel to ambient light.

[0081] In some embodiments, the orthographic projection shape of the first cutout pattern 220 on the substrate 1 includes any one of the following shapes: bar, "wood" shape, cross shape, ring shape, and fence shape.

[0082] In some embodiments, the first insulating layer 23 is made of an inorganic insulating material, such as silicon nitride, silicon oxide, or silicon oxynitride.

[0083] In some embodiments, such as Figure 2dAs shown, the sub-pixel 2 also includes a second insulating layer 24, located on the side of the first insulating layer 23 away from the substrate 1 and on the side of the second electrode 22 close to the substrate 1. A second hollow pattern 240 is formed in the second insulating layer 24, and the orthographic projection of the second hollow pattern 240 on the substrate 1 coincides with the orthographic projection of the first hollow pattern 220 on the substrate 1.

[0084] The second perforated pattern 240 refers to a pattern that penetrates the thickness of the second insulating layer 24, meaning that the first insulating layer 23 is exposed at the second perforated pattern 240. By setting the second insulating layer 24 between the first insulating layer 23 and the second electrode 22, and opening the second perforated pattern 240 in the second insulating layer 24, most or all of the charged particles in the electrophoretic liquid 5 that are concentrated on the side where the driving backplate 6 is located can be moved to the first perforated pattern 220 and the second perforated pattern 240 under the action of the horizontal electric field formed between the first electrode 21 and the second electrode 22. This further exposes the side surface of the second electrode 22 facing away from the substrate 1, and further enables the side surface of the second electrode 22 facing away from the substrate 1 to reflect the ambient light irradiated onto it by the substrate 4, further improving the reflectivity of the electronic paper display panel to ambient light, further improving the display brightness of the electronic paper display panel, and further improving the display effect of the electronic paper display panel.

[0085] In some embodiments, the second insulating layer 24 is made of an inorganic insulating material, such as silicon nitride, silicon oxide, or silicon oxynitride.

[0086] In some embodiments, such as Figure 2a and Figure 2e As shown, multiple sub-pixels 2 are arranged in an array. The driving backplate also includes a barrier 3, which is located between any two adjacent sub-pixels 2. The barrier 3 contacts and connects with the surface of the substrate 1 near the first electrode 21. The distance between the side surface of the barrier 3 away from the substrate 1 and the substrate 1 is greater than the distance between the side surface of the second electrode 22 away from the substrate 1 and the substrate 1.

[0087] The barrier 3 separates each sub-pixel 2 into different sub-chambers, which facilitates the subsequent injection of electrophoretic fluid containing charged particles of different colors into different sub-chambers, thereby achieving color display of the electronic paper display panel.

[0088] In some embodiments, the retaining wall 3 may be made of polyimide or acrylic resin material.

[0089] In some embodiments, the second electrode 22 is made of a reflective metallic material. The material of the second electrode 22 may be a metallic material such as copper or silver. This material results in a high reflectivity of the second electrode 22 to light, thereby further enhancing the reflectivity of the electronic paper display panel to ambient light by reflecting ambient light transmitted through the substrate 4 onto the surface of the second electrode 22 facing away from the substrate 1.

[0090] In some embodiments, such as Figure 3a As shown, the orthographic projection of the third electrode 42 onto the driving backplate 6 covers multiple sub-pixels 2 in the driving backplate 6. That is, the third electrode 42 is disposed over the entire surface.

[0091] In some embodiments, the third electrode includes multiple sub-electrodes (not shown in the figure), and the orthographic projection of the multiple sub-electrodes on the driving backplane covers multiple sub-pixels. That is, the third electrode is arranged in blocks, with one sub-electrode corresponding to one sub-pixel.

[0092] In some embodiments, such as Figure 3b As shown, the cell substrate 4 also includes a color filter layer 43, located on the side of the third electrode 42 near the first substrate 41. The color filter layer 43 includes a black matrix 430, a plurality of first color filters 431, a plurality of second color filters 432, and a plurality of third color filters 433. The black matrix 430 is located between any two adjacent first color filters 431, second color filters 432, and third color filters 433. The first color filters 431, second color filters 432, and third color filters 433 have different colors, and the orthographic projections of the first color filters 431, second color filters 432, and third color filters 433 on the driving backplate 6 respectively cover different sub-pixels 2.

[0093] In some embodiments, the colors of the first color resist 431, the second color resist 432, and the third color resist 433 are red, green, and blue, respectively. The presence of the color filter layer 43 enables the display panel to achieve color display.

[0094] In some embodiments, a first color resist 431, a second color resist 432, and a third color resist 433 constitute a group, and the first color resist 431, the second color resist 432, and the third color resist 433 within a group are arranged adjacent to each other along a first direction. The first color resist 431, the second color resist 432, and the third color resist 433 within a group, along with their respective sub-pixels 2 and electrophoretic solution 5, constitute a pixel unit. The setting of different color resists enables color display of this pixel unit, thereby realizing color display of the electronic paper display panel.

[0095] In some embodiments, such as Figure 3a and Figure 3b As shown, the electrophoretic solution 5 includes black charged particles and white charged particles, and the black charged particles and white charged particles have opposite polarities of charge.

[0096] In some embodiments, such as Figure 3c As shown, the end of the baffle 3 in the drive backplate 6 facing away from the substrate 1 contacts and connects to the matching substrate 4, so as to divide the matching gap between the matching substrate 4 and the drive backplate 6 into multiple sub-chambers; the three sub-chambers that are sequentially adjacent along the first direction are the first sub-chamber 101, the second sub-chamber 102 and the third sub-chamber 103. The electrophoretic solution 5 in the first sub-chamber 101 includes charged particles of a first color and black charged particles; the charged particles of the first color and the black charged particles have opposite polarities of charge; the electrophoretic solution 5 in the second sub-chamber 102 includes charged particles of a second color and black charged particles; the charged particles of the second color and the black charged particles have opposite polarities of charge; the electrophoretic solution 5 in the third sub-chamber 103 includes charged particles of a third color and black charged particles; the charged particles of the third color and the black charged particles have opposite polarities of charge; the first color, the second color and the third color are different and all are non-black.

[0097] The first, second, and third colors can be red, green, and blue, respectively. With this configuration, when the electronic paper display panel is in use, the electrophoretic solution 5 in the first sub-chamber 101 can display red, the electrophoretic solution 5 in the second sub-chamber 102 can display green, and the electrophoretic solution 5 in the third sub-chamber 103 can display blue. The first sub-chamber 101, the second sub-chamber 102, and the third sub-chamber 103, sequentially adjacent along the first direction, constitute a pixel unit. This pixel unit can achieve color display, thereby realizing the color display of the electronic paper display panel.

[0098] Based on the above structure of the display panel, this embodiment of the invention also provides a driving method for the electronic paper display panel, comprising: applying different voltages to the first electrode and the second electrode in the electronic paper display panel and to the third electrode in the substrate, respectively, driving two charged particles of different colors in the electrophoretic solution to move toward the light-emitting side and the side opposite to the light-emitting side of the electronic paper display panel, thereby realizing the display of the electronic paper display panel.

[0099] In some embodiments, a first voltage is applied to a first electrode, a second voltage is applied to a second electrode, and a third voltage is applied to a third electrode. When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a white display is achieved; when the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved; when the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, a reflective display of the second electrode is achieved.

[0100] In some embodiments, such as Figure 4a and Figure 4bAs shown, a positive voltage, such as 15V, is applied to the third electrode 42, while a voltage of 0V is applied to the first electrode 21 and the second electrode 22. The direction of the electric field is as follows: Figure 4a As shown, the white charged particles are negatively charged and move in the opposite direction to the electric field lines to reach the substrate 4; the black charged particles are positively charged and move in the direction of the electric field lines to reach the drive backplate 6; the ambient light that shines on the substrate 4 is reflected by the white charged particles gathered on one side of the substrate 4 to achieve white display.

[0101] In some embodiments, such as Figure 4c and Figure 4d As shown, the third electrode 42 is given a positive voltage, such as 15V, the first electrode 21 is given a negative voltage, such as -5V, and the second electrode 22 is given a voltage of 0V. The black charged particles above the second electrode 22 are... Figure 4b Based on this, the particles are further moved into the first cutout pattern 220 and the second cutout pattern 240. By moving the black charged particles into the first cutout pattern 220 and the second cutout pattern 240, the surface of the second electrode 22 is exposed, and the ambient light transmitted through the substrate 4 is reflected a second time, thereby increasing the reflectivity of the electronic paper display panel to ambient light, and thus improving the display brightness and display effect of the electronic paper display panel.

[0102] In some embodiments, such as Figure 4e As shown, the third electrode 42 is given a voltage of 0V, and the first electrode 21 and the second electrode 22 are given a positive voltage of 15V. The black charged particles move to one side of the substrate 4, and the white charged particles move to one side of the drive backplate 6. When the ambient light is incident from one side of the substrate 4, the black charged particles absorb the light, thus realizing the black display of the electronic paper display panel.

[0103] In some embodiments, by adjusting the voltage applied to the first electrode, the second electrode, and the third electrode, the degree of aggregation of black or white charged particles in the electrophoretic solution on the substrate side (i.e., the light-emitting side or the display side of the display panel) can be controlled, thereby achieving black and white display of different gray levels in the electronic paper display panel.

[0104] In some embodiments, the duration for which voltage is applied to the electrodes in each sub-pixel of the driving backplane is controlled to vary, thereby enabling different grayscale displays on the electronic paper display panel.

[0105] In some embodiments, a first voltage is applied to a first electrode, a second voltage is applied to a second electrode, and a third voltage is applied to a third electrode. When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a first color, a second color, or a third color is displayed. When the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved. When the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, a reflective display of the second electrode is achieved.

[0106] In some embodiments, controlling the voltage magnitude and duration of the first, second, and third electrodes corresponding to the first sub-chamber can control the degree of aggregation of black or red charged particles in the electrophoretic solution within the first sub-chamber on the substrate side (i.e., the light-emitting side or display side of the display panel), thereby enabling the electrophoretic solution within the first sub-chamber to achieve red display at different gray levels; controlling the voltage magnitude and duration of the first, second, and third electrodes corresponding to the second sub-chamber can control the aggregation of black or green charged particles in the electrophoretic solution within the second sub-chamber on the substrate side (i.e., the light-emitting side of the display panel). The aggregation degree of black charged particles or blue charged particles in the electrophoretic liquid in the third sub-chamber (i.e., the light-emitting side or the display side of the display panel) can be controlled to enable the electrophoretic liquid in the third sub-chamber to achieve different gray levels of green display; by controlling the voltage magnitude and the duration of voltage application of the first, second and third electrodes corresponding to the third sub-chamber, the aggregation degree of black charged particles or blue charged particles in the electrophoretic liquid in the third sub-chamber can be controlled to enable the electrophoretic liquid in the third sub-chamber to achieve different gray levels of blue display; thereby enabling the pixel unit composed of the first sub-chamber, the second sub-chamber and the third sub-chamber to achieve color display, and finally realizing the color display of the electronic paper display panel.

[0107] In some embodiments, the magnitude or duration of the voltage applied to the first electrode, the second electrode, and the third electrode can be controlled to achieve different grayscale displays on the electronic paper display panel.

[0108] The electronic paper display panel provided in this invention, by setting first and second electrodes located on different layers in the driving backplate, can form a horizontal electric field between the first and second electrodes, compared to the electronic paper display structure in related technologies. This horizontal electric field, together with the vertical electric field between the first and second electrodes and the third electrode, drives the movement of charged particles in the electrophoretic solution. This results in a more complex electric field distribution in the electronic paper display panel, increasing the grayscale adjustment dimension of the electrophoretic solution. The charged particles in the electrophoretic solution move within both the vertical and horizontal electric fields. The response time of the motion under the action is accelerated; in addition, by opening the first hollow pattern in the second electrode, the charged particles gathered in the electrophoretic liquid on the side where the driving back plate is located can move most or all of them into the first hollow pattern under the action of the horizontal electric field formed between the first electrode and the second electrode, thereby exposing the side surface of the second electrode away from the substrate, and thus enabling the side surface of the second electrode away from the substrate to reflect the ambient light irradiated onto it through the substrate, thereby improving the reflectivity of the electronic paper display panel to ambient light, improving the display brightness of the electronic paper display panel, and improving the display effect of the electronic paper display panel.

[0109] Based on the above structure of the display panel, this embodiment of the invention also provides a method for manufacturing the display panel, including: manufacturing a driving backplate;

[0110] Preparation of a cell substrate;

[0111] Electrophoretic solution is dropped or spin-coated onto the cell-side surface of the drive backplate and the cell-side substrate;

[0112] The drive backplane that has completed the above steps is then aligned with the cell-aligning substrate.

[0113] This invention also provides a display device, including the electronic paper display panel described in the above embodiments.

[0114] The display device provided in this embodiment of the invention, by employing the electronic paper display panel in the above embodiment, makes the electric field displayed by the display device no longer singular, thereby increasing the grayscale adjustment dimension of the display device. In addition, it can also improve the reflectivity of the display device to ambient light, improve the display brightness of the display device, and improve the display effect of the display device.

[0115] The display device can be any product or component with display function, such as an electrophoretic display panel, electronic paper, mobile phone, tablet computer, laptop computer, monitor, digital photo frame, or navigator.

[0116] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An electronic paper display panel, comprising a driving backplane, a substrate, and an electrophoretic solution. The driving back plate is disposed in conjunction with the matching substrate, and the electrophoretic liquid is contained in the gap between the driving back plate and the matching substrate. The driving backplane includes a substrate and a plurality of sub-pixels, the plurality of sub-pixels being located on one side of the substrate. The sub-pixel includes a first electrode, a second electrode, and a first insulating layer, wherein the first electrode, the first insulating layer, and the second electrode are stacked sequentially away from the substrate. The substrate includes a first substrate and a third electrode, wherein the third electrode is located on the side of the first substrate closer to the driving backplate. Its features are, The second electrode has a first hollowed-out pattern. The orthographic projections of the second electrode and the first hollow pattern on the substrate overlap with the orthographic projections of the first electrode, the first insulating layer and the third electrode on the substrate; The first hollow pattern is evenly distributed in the second electrode; The orthographic projection shape of the first hollow pattern on the substrate includes any one of the following shapes: bar, "wood" shape, cross shape, ring shape, and fence shape; The charged particles that gather in the electrophoretic solution on the side where the driving back plate is located can move most or all of them into the first hollow pattern under the action of the horizontal electric field formed between the first electrode and the second electrode, so that the side surface of the second electrode facing away from the substrate is exposed, and the side surface of the second electrode facing away from the substrate can reflect the ambient light that shines on it through the substrate. The sub-pixel further includes a second insulating layer located on the side of the first insulating layer facing away from the substrate and on the side of the second electrode close to the substrate. The second insulating layer has a second hollow pattern. The orthographic projection of the second cutout pattern on the substrate coincides with the orthographic projection of the first cutout pattern on the substrate.

2. The electronic paper display panel according to claim 1, characterized in that, The second electrode is made of a reflective metal material.

3. The electronic paper display panel according to claim 1, characterized in that, The cell substrate further includes a color filter layer located on the side of the third electrode closer to the first substrate. The color filter layer includes a black matrix, a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters, wherein the black matrix is ​​located between any two adjacent first color filters, second color filters, and third color filters; The first, second, and third color resists are different colors. The orthographic projections of the first color resist, the second color resist, and the third color resist on the driving backplate respectively cover different sub-pixels.

4. The electronic paper display panel according to claim 3, characterized in that, A set consists of one first color resistor, one second color resistor, and one third color resistor. The first color resist, the second color resist, and the third color resist in a group are arranged adjacent to each other along a first direction.

5. The electronic paper display panel according to claim 4, characterized in that, The electrophoretic solution comprises black charged particles and white charged particles. The black charged particles and the white charged particles have opposite polarities of charge.

6. The electronic paper display panel according to claim 1, characterized in that, The multiple sub-pixels are arranged in an array. The driving backplate also includes a baffle wall located between any two adjacent sub-pixels, and the baffle wall is in contact with and connected to the surface of the substrate near the first electrode; The distance between the side surface of the retaining wall facing away from the substrate and the substrate is greater than the distance between the side surface of the second electrode facing away from the substrate and the substrate. One end of the barrier wall away from the substrate contacts and connects to the matching substrate to divide the matching gap between the matching substrate and the drive back plate into multiple sub-chambers. The three sub-chambers that are sequentially adjacent along the first direction are designated as the first sub-chamber, the second sub-chamber, and the third sub-chamber. The electrophoretic solution in the first sub-chamber includes charged particles of a first color and black charged particles; the charged particles of the first color and the black charged particles have opposite polarities of charge. The electrophoretic solution in the second sub-chamber comprises charged particles of a second color and black charged particles; the charged particles of the second color and the black charged particles have opposite polarities of charge. The electrophoretic solution in the third sub-chamber includes charged particles of a third color and black charged particles; the charged particles of the third color and the black charged particles have opposite polarities of charge. The first color, the second color, and the third color are different and all are not black.

7. The electronic paper display panel according to claim 1, characterized in that, The orthographic projection of the third electrode onto the driving backplate covers the plurality of sub-pixels; Alternatively, the third electrode may include a plurality of sub-electrodes, the orthographic projections of which on the driving backplane cover the plurality of sub-pixels.

8. A display device, characterized in that, Includes the electronic paper display panel as described in any one of claims 1-7.

9. A method for preparing an electronic paper display panel as described in any one of claims 1-7, characterized in that, include: Fabrication of the driving backplate; Fabrication of a cell substrate; Electrophoretic solution is dripped or spin-coated onto the cell-matching surface of the drive backplate and the cell-matching substrate; The drive backplate that has completed the above steps is then paired with the matching substrate.

10. A driving method for an electronic paper display panel as described in any one of claims 1-7, characterized in that, include: Different voltages are applied to the first and second electrodes of the driving backplate and the third electrode of the substrate in the electronic paper display panel, respectively, to drive two charged particles of different colors in the electrophoretic solution to move toward the light-emitting side and the side opposite to the light-emitting side of the electronic paper display panel, thereby realizing the display of the electronic paper display panel.

11. The driving method for an electronic paper display panel according to claim 10, characterized in that, A first voltage is applied to the first electrode, a second voltage is applied to the second electrode, and a third voltage is applied to the third electrode. When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a white display is achieved; When the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved; When the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, the reflection display of the second electrode is realized.

12. The driving method for an electronic paper display panel according to claim 10, characterized in that, A first voltage is applied to the first electrode, a second voltage is applied to the second electrode, and a third voltage is applied to the third electrode. When the third voltage is greater than the first voltage and the second voltage, and the first voltage is equal to the second voltage, the first color, the second color, or the third color can be displayed. When the third voltage is less than the first voltage and the second voltage, and the first voltage is equal to the second voltage, a black display is achieved; When the third voltage is greater than the first voltage and the second voltage, and the first voltage is greater than the second voltage, the reflection display of the second electrode is realized.

13. The driving method for an electronic paper display panel according to claim 11 or 12, characterized in that, By controlling the magnitude or duration of the voltage applied to the first electrode, the second electrode, and the third electrode, different grayscale displays can be achieved on the electronic paper display panel.

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