Transflective display panel and display device

Abstract

The utility model discloses a transflective display panel and a display device, the transflective display panel comprises a color film substrate, an array substrate and a liquid crystal layer located between the color film substrate and the array substrate, the array substrate is provided with a plurality of pixel units distributed in an array and pixel electrodes corresponding to the pixel units; the array substrate is provided with a reflecting layer and a long-pass filter, the reflecting layer covers the pixel units and is provided with light holes in the area corresponding to the pixel electrodes, and the long-pass filter can transmit red light and green light and reflect part of blue light. The reflecting layer is arranged on the array substrate, and the light transmitting holes are formed in the area corresponding to the pixel electrodes, so that the reflecting layer can reflect the environment and transmit backlight, and reflecting display and transmitting display are achieved; and the long-pass filter is matched to transmit red and green light and reflect part of blue light, so that the transmission amount of the blue light in backlight can be reduced, the brightness of the blue light during transmission display is reduced, and the problem that the colors of white points are inconsistent during color transmission display and color reflection display is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of displays, in particular to a transflective display panel and a display device. Background Art

[0002] The display panel has the advantages of being thin, light, durable, and low power consumption, which meets the requirements of energy conservation and environmental protection. However, it needs to be used with a backlight source, resulting in a thick module and high cost. The electronic paper display (reflective display) has become a kind of display that meets the needs of the public. The electronic paper display can use external light sources to display images, unlike liquid crystal displays that require a backlight source. Therefore, in an outdoor environment with strong sunlight, the information on the electronic paper can still be clearly seen without the problem of viewing angles. Moreover, due to its advantages of power saving, high reflectivity, and contrast ratio, the electronic paper display has now been widely used in e-readers (such as e-books, e-newspapers) or other electronic components (such as price tags).

[0003] Existing electronic paper displays usually adopt E-Ink microcapsule technology (microcapsule electronic ink technology), SiPix microcup technology (microcup electrophoretic display technology), Bridgestone electronic liquid powder technology, cholesteric liquid crystal display (CLCD) technology, microelectromechanical system (MEMS) technology, or electrowetting technology. However, such an electronic paper display can only use ambient light for display. When the external light source is weak, the brightness of this electronic paper display will be lower, resulting in a lower contrast ratio and unable to display the picture normally.

[0004] In order to combine the advantages of transmissive display panels and electronic paper displays, display devices have emerged in the prior art. They can use both ambient light and backlight for display, and can also achieve color display. When the external light source is weak, the backlight can be turned on for light compensation to display normally. However, due to the different optical path differences between color transmissive display and color reflective display in the display device, the white point colors of color transmissive display and color reflective display are inconsistent, resulting in a color difference problem. Among them, the picture of color reflective display is yellowish, while the picture of color transmissive display is bluish. Moreover, existing display devices can either only achieve black and white display or only achieve color display, and cannot achieve both black and white display and color display. Summary of the Utility Model

[0005] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to provide a transflective display panel and a display device to solve the problem of color difference in color transmissive display and color reflective display of the display device in the prior art.

[0006] The object of the present utility model is achieved by the following technical solutions:

[0007] The present utility model provides a transflective display panel, including a color filter substrate, an array substrate disposed opposite to the color filter substrate, and a liquid crystal layer located between the color filter substrate and the array substrate. Multiple first scanning lines and multiple first data lines are insulated and crossed on the array substrate to define a plurality of pixel units distributed in an array. A pixel electrode and a first thin film transistor are provided in each pixel unit on the array substrate. Each pixel electrode is electrically connected to the corresponding first scanning line and the first data line through the corresponding first thin film transistor.

[0008] A reflective layer and a long-pass filter are provided on the array substrate. The reflective layer covers the pixel units and has light-transmitting holes in the areas corresponding to the pixel electrodes. The long-pass filter can transmit red and green light and reflect part of the blue light.

[0009] Further, the color filter substrate is an electro-wetting color filter substrate. The color filter substrate includes a first substrate, a second substrate disposed opposite to the first substrate, and a partition wall located between the first substrate and the second substrate. The partition wall divides the gap between the first substrate and the second substrate into a plurality of accommodation cavities distributed in an array. Each accommodation cavity is provided with an electro-controlled ink dye. The accommodation cavities correspond to the pixel units one by one. A first electrode is provided on the first substrate, and a second electrode matched with the first electrode is provided on the second substrate.

[0010] Further, the electro-controlled ink dyes include a red electro-controlled ink dye, a green electro-controlled ink dye, and a blue electro-controlled ink dye. The red electro-controlled ink dye, the green electro-controlled ink dye, and the blue electro-controlled ink dye are respectively provided in different accommodation cavities.

[0011] Further, multiple second scanning lines, multiple second data lines, and multiple second thin film transistors are provided on the second substrate. The second electrode includes a plurality of electrode blocks corresponding to the accommodation cavities one by one. Each electrode block is electrically connected to the corresponding second scanning line and the second data line through the corresponding second thin film transistor.

[0012] Alternatively, the second electrode is a planar electrode that entirely covers the second substrate.

[0013] Further, a common electrode cooperating with the pixel electrode is provided on the color filter substrate. The liquid crystal layer is aligned parallel to the color filter substrate and the array substrate. The alignment direction of the liquid crystal layer on the side close to the color filter substrate is perpendicular to the alignment direction on the side close to the array substrate. A first circular polarizer is provided on the color filter substrate, and a second circular polarizer cooperating with the first circular polarizer is provided on the array substrate.

[0014] Further, a common electrode cooperating with the pixel electrode is provided on the color filter substrate. The liquid crystal layer is composed of dye liquid crystal molecules. The liquid crystal layer is aligned parallel to the color filter substrate and the array substrate. The alignment direction of the dye liquid crystal molecules on the side close to the color filter substrate is perpendicular to the alignment direction on the side close to the array substrate.

[0015] Further, the reflective layer is a block electrode. Each reflective layer corresponds to one pixel unit, and each reflective layer is electrically connected to the corresponding pixel electrode.

[0016] Alternatively, the reflective layer is a planar electrode that entirely covers the array substrate.

[0017] Further, the reflective layer is located on the side of the pixel electrode facing the liquid crystal layer. A raised structure layer is provided between the reflective layer and the pixel electrode. The reflective layer directly covers the surface of the raised structure layer and forms a protrusion corresponding to the surface of the raised structure layer.

[0018] Further, the area ratio of the light-transmitting hole in the area corresponding to the pixel unit to the area of the pixel unit is 15% - 18%.

[0019] The present application also provides a display device, including a backlight module and the transflective display panel as described above. The transflective display panel is provided on the light-emitting side of the backlight module.

[0020] The beneficial effects of the present utility model are as follows: By providing a reflective layer on the array substrate and providing a light-transmitting hole in the area corresponding to the pixel electrode, the reflective layer can reflect the environment and transmit the backlight, realizing reflective display and transmissive display; combined with a long-pass filter that transmits red and green light and reflects part of the blue light, the transmission amount of blue light in the backlight can be reduced, so as to reduce the brightness of blue light during transmissive display and avoid the problem of inconsistent white point colors in color transmissive display and color reflective display. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the display device in the initial state in Embodiment 1 of the present utility model.

[0022] Figure 2It is a schematic plan view of the array substrate in Embodiment 1 of the present utility model;

[0023] Figure 3 It is a schematic plan view of the second substrate in Embodiment 1 of the present utility model;

[0024] Figure 4 It is a schematic plan view of the color filter substrate in the color display mode in Embodiment 1 of the present utility model;

[0025] Figure 5 It is a transmittance curve graph of the long-pass filter and the short-pass filter for different lights in Embodiment 1 of the present utility model;

[0026] Figure 6 It is a schematic structural view of the display device in the color reflection display in Embodiment 1 of the present utility model;

[0027] Figure 7 It is a schematic structural view of the display device in the color transmission display in Embodiment 1 of the present utility model;

[0028] Figure 8 It is a schematic structural view of the display device in the black state in the color display mode in Embodiment 1 of the present utility model;

[0029] Figure 9 It is a schematic plan view of the color filter substrate in the black and white display mode in Embodiment 1 of the present utility model;

[0030] Figure 10 It is a schematic structural view of the display device in the black and white reflection display in Embodiment 1 of the present utility model;

[0031] Figure 11 It is a schematic structural view of the display device in the black and white transmission display in Embodiment 1 of the present utility model;

[0032] Figure 12 It is a schematic structural view of the display device in the black state in the black and white display mode in Embodiment 1 of the present utility model;

[0033] Figure 13 It is a schematic structural view of the display device in the initial state in Embodiment 2 of the present utility model;

[0034] Figure 14 It is a schematic structural view of the display device in the color reflection display in Embodiment 2 of the present utility model;

[0035] Figure 15 It is a schematic structural view of the display device in the color transmission display in Embodiment 2 of the present utility model;

[0036] Figure 16 It is a schematic structural view of the display device in the black state in the color display mode in Embodiment 2 of the present utility model;

[0037] Figure 17 It is a schematic structural diagram of the display device in the black-and-white reflection display in the second embodiment of the present invention;

[0038] Figure 18 It is a schematic structural diagram of the display device in the black-and-white transmission display in the second embodiment of the present invention;

[0039] Figure 19 It is a schematic structural diagram of the black state of the display device in the black-and-white display mode in the second embodiment of the present invention;

[0040] Figure 20 It is a schematic structural diagram of the display device in the initial state in the third embodiment of the present invention. Detailed implementation manners

[0041] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined utility model purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and effects of the transflective display panel and display device proposed according to the present invention as follows:

[0042] [Embodiment 1]

[0043] Figure 1 It is a schematic structural diagram of the display device in the initial state in the first embodiment of the present invention. Figure 2 It is a schematic plan view of the array substrate in the first embodiment of the present invention. Figure 3 It is a schematic plan view of the second substrate in the first embodiment of the present invention. Figure 4 It is a schematic plan view of the color filter substrate in the color display mode in the first embodiment of the present invention.

[0044] As Figures 1 to 4 shown, a transflective display panel provided in the first embodiment of the present invention includes a color filter substrate 10, an array substrate 20 disposed opposite to the color filter substrate 10, and a liquid crystal layer 30 located between the color filter substrate 10 and the array substrate 20. In this embodiment, the liquid crystal layer 30 is composed of positive liquid crystal molecules, and the positive liquid crystal molecules are aligned parallel to the color filter substrate 10 and the array substrate 20. The alignment directions of the positive liquid crystal molecules on the side close to the color filter substrate 10 and the side close to the array substrate 20 are perpendicular to each other to achieve the TN display mode.

[0045] Since the liquid crystal layer 30 uses conventional positive liquid crystal molecules, a first circular polarizer 41 is provided on the color filter substrate 10, and a second circular polarizer 42 that cooperates with the first circular polarizer 41 is provided on the array substrate 20. Among them, the first circular polarizer 41 is composed of a first quarter-wave plate and a first polarizer. The first quarter-wave plate is located on the side of the first polarizer facing the liquid crystal layer 30, and the fast / slow axis of the first quarter-wave plate forms a 45° angle with the transmission axis of the first polarizer; the second circular polarizer 42 is composed of a second quarter-wave plate and a second polarizer. The second quarter-wave plate is located on the side of the second polarizer facing the liquid crystal layer 30, and the fast / slow axis of the second quarter-wave plate forms a 45° angle with the transmission axis of the second polarizer. The transmission axis of the first polarizer and the transmission axis of the second polarizer are perpendicular to each other. For example, the transmission axis of the first polarizer is 0°, and the transmission axis of the second polarizer is 90°.

[0046] As Figure 2 shown, on the array substrate 20, a plurality of first scan lines 1 and a plurality of first data lines 2 are insulated and cross each other to define a plurality of pixel units SP arranged in an array. The array substrate 20 is provided with a pixel electrode 21 and a first thin film transistor 3 in each pixel unit SP. Each pixel electrode 21 is electrically connected to the corresponding first scan line 1 and first data line 2 through the corresponding first thin film transistor 3. Among them, the first thin film transistor 3 includes a first gate, a first active layer, a first drain, and a first source. The first gate and the first scan line 1 are on the same layer and electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 2, and the first drain is electrically connected to the pixel electrode 21 through a contact hole.

[0047] As Figure 1 shown, on the side of the color filter substrate 10 facing the liquid crystal layer 30, a common electrode 121 that cooperates with the pixel electrode 21 is provided. The common electrode 121 is a planar electrode that entirely covers the color filter substrate 10. A vertical electric field can be formed between the pixel electrode 21 and the common electrode 121 to drive the liquid crystal molecules in the liquid crystal layer 30 to deflect in the vertical direction.

[0048] Furthermore, a reflective layer 22 and a long-pass filter 23 are also provided on the array substrate 20. The reflective layer 22 covers the pixel unit SP and has a light-transmitting hole 221 in the area corresponding to the pixel electrode 21. The long-pass filter 23 can transmit red and green light and reflect part of the blue light. Among them, the reflective layer 22 is made of a reflective metal such as aluminum or silver. The light-transmitting hole 221 can be a plurality of through holes in the area corresponding to the pixel electrode 21. The area ratio of the light-transmitting hole 221 in the area corresponding to the pixel unit SP to the area of the pixel unit SP is 15%-18%. Since the brightness of the backlight is usually greater than that of the ambient light, by making the area of the light-reflecting area of the reflective layer 22 larger than the area of the light-transmitting area, the difference in brightness between the color reflective display and the color transmissive display can be reduced. By providing the reflective layer 22 on the array substrate 20 and having a light-transmitting hole 221 in the area corresponding to the pixel electrode 21, the reflective layer 22 can reflect the ambient light and transmit the backlight, realizing reflective display and transmissive display; and then cooperating with the long-pass filter 23 to transmit red and green light and reflect part of the blue light, thereby reducing the transmission amount of blue light in the backlight to reduce the brightness of blue light during transmissive display, avoiding the problem of inconsistent white point colors in color transmissive display and color reflective display.

[0049] Among them, both the long-pass filter 23 (Short-pass filter, SPF) and the short-pass filter (Long-pass filter, LPF) belong to the distributed Bragg reflector (DBR). The short-pass filter can transmit blue light with a wavelength below 490 nm and reflect red and green light with a wavelength between 500 and 680 nm. The long-pass filter 23 can transmit red and green light with a wavelength between 500 and 680 nm and reflect blue light with a wavelength below 490 nm. The distributed Bragg reflector (distributed Bragg reflector, DBR) is a reflector used in a waveguide. The long-pass filter 23 and the short-pass filter use SiO2 (silicon dioxide) and TiO2 (titanium dioxide) as alternating materials, and by adjusting the thickness and logarithm of the film layer, DBRs with two different band-passes are achieved. When light passes through different media, it will be reflected at the interface, and the size of the reflectivity is related to the refractive index between the media. Therefore, if we stack different refractive index thin films alternately and periodically, when light passes through these thin films with different refractive indices, because the light reflected from each layer undergoes constructive interference due to the change in the phase angle and then combines with each other, strong reflected light is obtained. If the number of multi-film layers becomes very large and the difference in the refractive indices n1, n2, n3... of the thin films becomes very small, the light is like traveling in the same medium, and the reflection coefficient becomes very small. Due to the multiple interference of light, the interference effect is very obvious, so the selection of wavelengths becomes very sensitive. When using a situation similar to a grating, such a periodic structure is called a distributed Bragg reflector.

[0050] Figure 5 is the transmittance curve diagram of the long-pass filter and the short-pass filter for different lights in the first embodiment of the present utility model. As Figure 5 shown, in the figure, the curves R, G, and B respectively represent the wavelengths of red, green, and blue lights, and the curves L and S respectively represent the transmittances of the long-pass filter 23 and the short-pass filter for lights with different wavelengths. It can be Figure 5 seen that the short-pass filter has a good transmission effect on blue light with a wavelength below 490 nm, and the transmittance can reach more than 95%; the long-pass filter 23 has a good transmission effect on red and green lights with wavelengths in the range of 500 - 680 nm, and the transmittance can reach more than 95%, but it also has a certain transmission effect on blue light. Among them, we can set the reflection effect and transmission effect of the long-pass filter 23 on blue light by changing the thickness and logarithm of the distributed Bragg reflector film layer, and the transmission effect of the long-pass filter 23 on blue light can be set according to actual needs.

[0051] As Figure 1 and Figure 3 shown, the reflective layer 22 is a block-shaped electrode, each reflective layer 22 corresponds to a pixel unit SP one by one, and each reflective layer 22 is electrically connected to the corresponding pixel electrode 21. By setting the reflective layer 22 as multiple block-shaped electrodes and electrically connecting them to the corresponding pixel electrodes 21, the impedance of the pixel electrode 21 can be reduced. Of course, in other embodiments, the reflective layer 22 can also be set as a planar electrode that entirely covers the array substrate 20, but the reflective layer 22 needs to be insulated from the pixel electrode 21.

[0052] Furthermore, the reflective layer 22 is located on the side of the pixel electrode 21 facing the liquid crystal layer 30. A raised structure layer 24 is provided between the reflective layer 22 and the pixel electrode 21. The reflective layer 22 directly covers the surface of the raised structure layer 24 and forms a protrusion corresponding to the surface of the raised structure layer 24, so that multiple protrusions are also formed on the reflective layer 22 to achieve a diffuse reflection effect and improve the reflection effect.

[0053] In this embodiment, the color filter substrate 10 is an electro-wetting color filter substrate. The color filter substrate 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a partition wall 14 located between the first substrate 11 and the second substrate 12. The partition wall 14 divides the gap between the first substrate 11 and the second substrate 12 into a plurality of accommodation cavities 101 arranged in an array. Each accommodation cavity 101 is provided with an electro-controlled ink dye 13. The accommodation cavities 101 correspond to pixel units SP one by one. A first electrode 111 is provided on the first substrate 11, and a second electrode 122 cooperating with the first electrode 111 is provided on the second substrate 12. By controlling the electro-controlled ink dye 13 in the accommodation cavity 101 to disperse in the accommodation cavity 101 or converge at the edge of the accommodation cavity 101 through the first electrode 111 and the second electrode 122, the transflective display panel can be switched between a color display mode and a black-and-white display mode. It can be understood that a hydrophobic layer is also coated on the inner wall of the accommodation cavity 101. Among them, the first electrode 111 is a planar electrode that entirely covers the first substrate 11.

[0054] Further, as Figure 1 and Figure 4 shown, the electro-controlled ink dye 13 has a red electro-controlled ink dye 13r, a green electro-controlled ink dye 13g, and a blue electro-controlled ink dye 13b. The red electro-controlled ink dye 13r, the green electro-controlled ink dye 13g, and the blue electro-controlled ink dye 13b are respectively disposed in different accommodation cavities 101 to respectively correspond to red pixel units, green pixel units, and blue pixel units. Therefore, color resist materials do not need to be provided on the color filter substrate 10, and the light filtering effect can be achieved through the electro-controlled ink dye 13. Of course, in other embodiments, the color filter substrate 10 can also adopt a conventional color resist color filter substrate.

[0055] As Figure 3As shown in the figure, a plurality of second scan lines 4, a plurality of second data lines 5 and a plurality of second thin film transistors 6 are provided on the second substrate 12. The second electrode 122 includes a plurality of electrode blocks 122a corresponding to the accommodation cavities 101 one by one. Each electrode block 122a is electrically connected to the corresponding second scan line 4 and second data line 5 through the corresponding second thin film transistor 6. Among them, the second thin film transistor 6 includes a second gate, a second active layer, a second drain and a second source. The second gate is located on the same layer as the second scan line 4 and is electrically connected. The second gate and the second active layer are separated by an insulating layer. The second source is electrically connected to the second data line 5, and the second drain is electrically connected to the electrode block 122a through a contact hole. By setting the second electrode 122 as a plurality of electrode blocks 122a and independently controlling them through the second thin film transistor 6, the second scan line 4 and the second data line 5, the color film substrate 10 can separately control the distribution of the electro-controlled ink dye 13 in each accommodation cavity 101, so as to better adjust the colors of the transmissive display and the reflective display, and reduce the color difference between the color transmissive display and the color reflective display. Moreover, the colors of the red pixel unit, the green pixel unit and the blue pixel unit are independently controlled respectively, there is no color mixing problem, the black matrix can be omitted, and the color gamut can be adjusted, taking into account the brightness and color gamut of the module.

[0056] Among them, the first substrate 11, the second substrate 12, and the array substrate 20 can be made of transparent substrates such as glass, acrylic, and polycarbonate. The materials of the common electrode 121, the pixel electrode 21, the first electrode 111, and the second electrode 122 can be made of transparent electrodes such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0057] The present application also provides a display device, including a backlight module 50 and the transflective display panel as described above. The transflective display panel is disposed on the light-emitting side of the backlight module 50, and the array substrate 20 is disposed on the side of the transflective display panel close to the backlight module 50. The backlight module 50 is used to provide a backlight source for the transflective display panel when the ambient light is weak.

[0058] The control method of the display device in the present application is as follows:

[0059] Figure 6 It is a schematic structural diagram of the display device in the first embodiment of the present invention during color reflective display. As Figure 6As shown in the figure, during color reflective display, no voltage signal needs to be applied to all the first electrodes 111 and second electrodes 122, so that the electro-controlled ink dyes 13 in the accommodating cavity 101 are dispersed in the accommodating cavity 101, and the light passing through the color film substrate 10 can be filtered by the electro-controlled ink dyes 13. The backlight module 50 is turned off, so that only ambient light is used for display. A common voltage signal is applied to the common electrode 121, and a corresponding gray-scale voltage (gray-scale voltage of 0 - 255) is applied to the pixel electrode 21, so as to separately control the brightness of each pixel unit SP reflecting ambient light, so as to realize the reflective display of a color picture.

[0060] Figure 7 It is a schematic structural diagram of the display device in the first embodiment of the present invention during color transmissive display. As Figure 7 shown, during color transmissive display, no voltage signal needs to be applied to all the first electrodes 111 and second electrodes 122, so that the electro-controlled ink dyes 13 in the accommodating cavity 101 are dispersed in the accommodating cavity 101, and the light passing through the color film substrate 10 can be filtered by the electro-controlled ink dyes 13. The backlight module 50 is turned on, so that display is performed using backlight or using backlight and ambient light simultaneously. A common voltage signal is applied to the common electrode 121, and a corresponding gray-scale voltage (gray-scale voltage of 0 - 255) is applied to the pixel electrode 21, so as to separately control the brightness of each pixel unit SP reflecting ambient light, so as to realize the transmissive display of a color picture.

[0061] Figure 8 It is a schematic structural diagram of the black state of the display device in the first embodiment of the present invention during color display mode. As Figure 8 shown, in the black state of the color display mode, no voltage signal needs to be applied to all the first electrodes 111 and second electrodes 122, so that the electro-controlled ink dyes 13 in the accommodating cavity 101 are dispersed in the accommodating cavity 101, and the light passing through the color film substrate 10 can be filtered by the electro-controlled ink dyes 13. The backlight module 50 can be turned on or off; if it is a reflective display mode, the backlight module 50 is turned off, and if it is a transmissive display mode, the backlight module 50 is turned on. A common voltage signal is applied to the common electrode 121, and a 0 gray-scale voltage is applied to the pixel electrode 21, so as to control the positive liquid crystal molecules in the liquid crystal layer 30 to deflect and stand in the vertical direction, so that light (reflected light, transmitted light) cannot be emitted from the transflective display panel, so as to realize the black state of the color display mode.

[0062] Figure 9 It is a schematic plan view of the color film substrate in the first embodiment of the present invention during black-and-white display mode. Figure 10 It is a schematic structural diagram of the display device in the first embodiment of the present invention during black-and-white reflective display. As Figure 9 and Figure 10As shown in the figure, during black-and-white reflective display, a common voltage signal is applied to the first electrode 111, and a driving voltage signal is applied to the second electrode 122, so as to form a driving electric field between the first electrode 111 and the second electrode 122, to control the electro-controlled ink dye 13 in the accommodating cavity 101 to gather at the edge of the accommodating cavity 101. The color filter substrate 10 has no light filtering effect, and the light passing through the color filter substrate 10 can all be directly transmitted. The backlight module 50 is turned off, so as to perform display only by using ambient light. A common voltage signal is applied to the common electrode 121, and a corresponding grayscale voltage (grayscale voltage from 0 to 255) is applied to the pixel electrode 21, so as to separately control the brightness of each pixel unit SP reflecting ambient light, to achieve the reflective display of a black-and-white picture.

[0063] Figure 11 It is a schematic structural diagram of the display device in Embodiment 1 of the present invention during black-and-white transmissive display. As Figure 11 shown, during black-and-white transmissive display, a common voltage signal is applied to the first electrode 111, and a driving voltage signal is applied to the second electrode 122, so as to form a driving electric field between the first electrode 111 and the second electrode 122, to control the electro-controlled ink dye 13 in the accommodating cavity 101 to gather at the edge of the accommodating cavity 101. The color filter substrate 10 has no light filtering effect, and the light passing through the color filter substrate 10 can all be directly transmitted. The backlight module 50 is turned on, so as to perform display by using backlight or simultaneously using backlight and ambient light. A common voltage signal is applied to the common electrode 121, and a corresponding grayscale voltage (grayscale voltage from 0 to 255) is applied to the pixel electrode 21, so as to separately control the brightness of each pixel unit SP reflecting ambient light, to achieve the transmissive display of a black-and-white picture.

[0064] Figure 12 It is a schematic structural diagram of the black state of the display device in Embodiment 1 of the present invention in the black-and-white display mode. As Figure 12 shown, in the black state of the black-and-white display mode, a common voltage signal is applied to the first electrode 111, and a driving voltage signal is applied to the second electrode 122, so as to form a driving electric field between the first electrode 111 and the second electrode 122, to control the electro-controlled ink dye 13 in the accommodating cavity 101 to gather at the edge of the accommodating cavity 101. The color filter substrate 10 has no light filtering effect, and the light passing through the color filter substrate 10 can all be directly transmitted. The backlight module 50 can be turned on or off; if it is a reflective display mode, the backlight module 50 is turned off, and if it is a transmissive display mode, the backlight module 50 is turned on. A common voltage signal is applied to the common electrode 121, and a 0 grayscale voltage is applied to the pixel electrode 21, so as to control the positive liquid crystal molecules in the liquid crystal layer 30 to deflect and stand upright in the vertical direction, so that the light (reflected light, transmitted light) cannot be emitted from the transflective display panel, to achieve the black state of the black-and-white display mode.

[0065] [Embodiment 2]

[0066] Figure 13 It is a schematic structural diagram of the display device in the initial state in the second embodiment of the present utility model. As Figure 13 shown, the transflective display panel and the display device provided in the second embodiment of the present utility model are basically the same as those in the first embodiment ( Figures 1 to 12 ), the difference is that in this embodiment:

[0067] A common electrode 121 cooperating with the pixel electrode 21 is provided on the color filter substrate 10. The liquid crystal layer 30 is composed of dye liquid crystal molecules. The dye liquid crystal molecules include liquid crystal molecules 31 and dye molecules 32 which are mixed with each other. The dye molecules 32 have an absorption axis and a transmission axis. The light absorption ability of the long axis of the dye molecules 32 is greater than that of the short axis. The dye molecules 32 have the characteristic that the light absorption ability of the long axis is strong and the light absorption ability of the short axis is very weak. The liquid crystal layer 30 is aligned parallel to the color filter substrate 10 and the array substrate 20, and the alignment directions of the dye liquid crystal molecules on the side close to the color filter substrate 10 and the side close to the array substrate 20 are perpendicular to each other to realize the TN display mode. Since the liquid crystal layer 30 in this embodiment adopts dye liquid crystal molecules, therefore, there is no need to provide the first circular polarizer 41 on the color filter substrate 10, and there is no need to provide the second circular polarizer 42 on the array substrate 20 either, which can greatly reduce the cell thickness and manufacturing cost of the transflective display panel, and can also improve the light transmittance.

[0068] Figure 14 It is a schematic structural diagram of the display device in the color reflection display in the second embodiment of the present utility model. Figure 15 It is a schematic structural diagram of the display device in the color transmission display in the second embodiment of the present utility model. Figure 16 It is a schematic structural diagram of the black state of the display device in the color display mode in the second embodiment of the present utility model. Figure 17 It is a schematic structural diagram of the display device in the black and white reflection display in the second embodiment of the present utility model. Figure 18 It is a schematic structural diagram of the display device in the black and white transmission display in the second embodiment of the present utility model. Figure 19 It is a schematic structural diagram of the black state of the display device in the black and white display mode in the second embodiment of the present utility model. As Figures 14 to 19 shown, the control method of the display device in this application is different from that of the display device in the first embodiment ( Figures 6 to 12 ) as follows:

[0069] In the first embodiment, it is in the bright state at the initial state, that is, the normally white mode; while in this embodiment, it is in the dark state at the initial state. In the first embodiment, when in the dark state, a vertical electric field needs to be formed between the common electrode 121 and the pixel electrode 21 to drive the liquid crystal molecules in the liquid crystal layer 30 to stand; while in this embodiment, when in the dark state, there is no need to form a vertical electric field between the common electrode 121 and the pixel electrode 21, and the dye liquid crystal molecules in the liquid crystal layer 30 maintain the initial lying posture. Among them, the switching between the color display mode and the black-and-white display mode and the control method of the backlight module 50 are the same as those in the first embodiment. Please refer to the first embodiment and will not be elaborated here.

[0070] Those skilled in the art should understand that the rest of the structure and working principle of this embodiment are the same as those in the first embodiment and will not be elaborated here.

[0071] [Embodiment Three]

[0072] Figure 20 is a schematic structural diagram of the display device in the initial state in the third embodiment of the present invention. As Figure 20 shown, the transflective display panel and the display device provided in the third embodiment of the present invention are basically the same as those in the first embodiment ( Figures 1 to 12 ), the second embodiment ( Figures 13 to 19 ). The difference is that in this embodiment:

[0073] The second electrode 122 is a planar electrode that entirely covers the second substrate 12. That is, the entire color filter substrate 10 controls all the electrochromic ink dyes 13 in the accommodation cavities 101 to be dispersed in the accommodation cavities 101 or converge at the edges of the accommodation cavities 101, thereby controlling the entire transflective display panel to switch between the color display mode and the black-and-white display mode.

[0074] Those skilled in the art should understand that the rest of the structure and working principle of this embodiment are the same as those in the first embodiment and the second embodiment and will not be elaborated here.

[0075] In this article, the orientation terms such as up, down, left, right, front, and back are defined based on the positions of the structures in the drawings and the positions relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the orientation terms should not limit the scope of protection requested by this application. It should also be understood that the terms "first" and "second" used in this article are only for distinction in name and do not limit the quantity and order.

[0076] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications by using the disclosed technical content within the scope of the technical solution of the present utility model, which are equivalent embodiments of equivalent changes. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A transflective display panel, characterized in that: The invention comprises a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10), and a liquid crystal layer (30) located between the color film substrate (10) and the array substrate (20); a plurality of first scanning lines (1) and a plurality of first data lines (2) on the array substrate (20) are insulated from each other and cross-defined to form a plurality of pixel units (SP) distributed in an array; a pixel electrode (21) and a first thin film transistor (3) are provided in each pixel unit (SP); each pixel electrode (21) is electrically connected to the corresponding first scanning line (1) and the first data line (2) via the corresponding first thin film transistor (3); A reflective layer (22) and a long-pass filter (23) are provided on the array substrate (20); the reflective layer (22) covers the pixel unit (SP) and is provided with a light-transmitting hole (221) in a region corresponding to the pixel electrode (21); and the long-pass filter (23) is capable of transmitting red and green light and reflecting part of blue light.

2. The transflective display panel according to claim 1, characterized in that: The color film substrate (10) is an electrowetting color film substrate, comprising a first substrate (11), a second substrate (12) arranged opposite to the first substrate (11), and a retaining wall (14) located between the first substrate (11) and the second substrate (12), wherein the retaining wall (14) divides the gap between the first substrate (11) and the second substrate (12) into a plurality of accommodating cavities (101) distributed in an array, wherein each of the accommodating cavities (101) is provided with an electrically controlled ink dye (13), wherein the accommodating cavities (101) correspond one-to-one to the pixel units (SP), wherein the first substrate (11) is provided with a first electrode (111), and the second substrate (12) is provided with a second electrode (122) matched with the first electrode (111).

3. The transflective display panel according to claim 2, wherein: The electronically controlled ink dye (13) comprises a red electronically controlled ink dye (13r), a green electronically controlled ink dye (13g) and a blue electronically controlled ink dye (13b); the red electronically controlled ink dye (13r), the green electronically controlled ink dye (13g) and the blue electronically controlled ink dye (13b) are respectively arranged in different accommodating cavities (101).

4. The transflective display panel according to claim 2, wherein: A plurality of second scanning lines (4), a plurality of second data lines (5) and a plurality of second thin film transistors (6) are provided on the second substrate (12); the second electrode (122) comprises a plurality of electrode blocks (122a) corresponding one-to-one to the accommodating cavity (101); each of the electrode blocks (122a) is electrically connected to the corresponding second scanning line (4) and the second data line (5) through the corresponding second thin film transistor (6); Alternatively, the second electrode (122) is a planar electrode that covers the entire surface of the second substrate (12).

5. The transflective display panel according to any one of claims 1 to 4, characterized in that: The color film substrate (10) is provided with a common electrode (121) that cooperates with the pixel electrode (21); the liquid crystal layer (30) is aligned parallel to the color film substrate (10) and the array substrate (20); the alignment direction of the liquid crystal layer (30) on a side close to the color film substrate (10) and the alignment direction on a side close to the array substrate (20) are perpendicular to each other; the color film substrate (10) is provided with a first circular polarizer (41); and the array substrate (20) is provided with a second circular polarizer (42) that cooperates with the first circular polarizer (41).

6. The transflective display panel according to any one of claims 1 to 4, characterized in that: A common electrode (121) cooperating with the pixel electrode (21) is provided on the color film substrate (10); the liquid crystal layer (30) is a dye liquid crystal molecule; the liquid crystal layer (30) is aligned parallel to the color film substrate (10) and the array substrate (20); the alignment direction of the dye liquid crystal molecule on a side close to the color film substrate (10) is perpendicular to the alignment direction on a side close to the array substrate (20).

7. The transflective display panel according to any one of claims 1 to 4, characterized in that: The reflective layer (22) is a block electrode, each of the reflective layers (22) corresponds to the pixel unit (SP) one by one, and each of the reflective layers (22) is electrically connected to the corresponding pixel electrode (21); Alternatively, the reflective layer (22) is a planar electrode that covers the entire surface of the array substrate (20).

8. The transflective display panel according to any one of claims 1 to 4, characterized in that: The reflective layer (22) is located on a side of the pixel electrode (21) facing the liquid crystal layer (30), a protrusion structure layer (24) is provided between the reflective layer (22) and the pixel electrode (21), and the reflective layer (22) directly covers the surface of the protrusion structure layer (24) and forms protrusions corresponding to the surface of the protrusion structure layer (24).

9. The transflective display panel according to any one of claims 1 to 4, characterized in that: The area of ​​the light-transmitting hole (221) in the region corresponding to the pixel unit (SP) accounts for 15%-18% of the area of ​​the pixel unit (SP).

10. A display device, characterized in that: It comprises a backlight module (50) and a transflective display panel as claimed in any one of claims 1 to 9, wherein the transflective display panel is arranged on the light emitting side of the backlight module (50).

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