CN219417939U - Display panel and display device - Google Patents

Abstract

The utility model discloses a display panel and a display device, wherein the display panel comprises a color film substrate, an array substrate and a liquid crystal layer; the color film substrate is provided with red quantum dots corresponding to the red sub-pixels, green quantum dots corresponding to the green sub-pixels and blue resistors corresponding to the blue sub-pixels; the color film substrate is provided with a distributed Bragg reflector corresponding to the red sub-pixel and the green sub-pixel, the distributed Bragg reflector comprises a long-pass filter and a short-pass filter, the long-pass filter is positioned at one side of the red quantum dot and the green quantum dot, which are far away from the liquid crystal layer, and the short-pass filter is positioned at one side of the red quantum dot and the green quantum dot, which are towards the liquid crystal layer; the array substrate is provided with a reflecting layer, the projection of part of blue sub-pixels on the array substrate is overlapped with at least part of the reflecting layer, and the projection of the other part of blue sub-pixels on the array substrate is staggered with the reflecting layer. The utilization rate of backlight and ambient light can be improved, and the semi-transparent and semi-reflective display effect is realized.

Description

Display panel and display device

Technical Field

The present utility model relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

The liquid crystal display panel has the advantages of good image quality, small volume, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and is widely applied to electronic devices such as notebook computers, mobile phones, electronic books, liquid crystal televisions and the like.

With the recent development and popularization of liquid crystal display technology, a liquid crystal display panel, i.e., a semi-reflective liquid crystal display device, which can be used in any environment has been developed. The semi-reflective liquid crystal display device can transmit a backlight source and reflect ambient light to realize normal display, which greatly improves the brightness of the display.

However, the conventional semi-reflective liquid crystal display device requires protrusions in the reflective region, so that the phase retardation of the transmissive region and the reflective region is equal, the manufacturing process is complex, the uniformity of the cell thickness is not easy to control, and the display quality is affected. In addition, a 1/4 wavelength wave plate is added on the basis of the original polaroid, the working procedure and the box thickness are increased, and the production cost is increased. In addition, the existing semi-reflective liquid crystal display device adopts red, green and blue color resistors on the color film substrate, when white light passes through R, G, B sub-pixels, 2/3 of the light quantity is absorbed by R, G, B of the color resistors, and only 1/3 of the light quantity passes through the color film substrate. Therefore, the conventional semi-reflective liquid crystal display device has a low light utilization rate, about 30%, and most of the light energy cannot be utilized, resulting in a low transmittance of the display device.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a display panel and a display device, so as to solve the problem that the utilization rate of light by a semi-reflective liquid crystal display device in the prior art is low.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides a display panel, which comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a liquid crystal layer arranged between the color film substrate and the array substrate, wherein a plurality of pixel units distributed in an array are arranged on the display panel, a red sub-pixel, a green sub-pixel and a blue sub-pixel are arranged in the pixel units, red quantum dots are arranged in the area of the color film substrate corresponding to the red sub-pixel, green quantum dots are arranged in the area corresponding to the green sub-pixel, and blue resistors are arranged in the area corresponding to the blue sub-pixel;

the color film substrate is provided with a distributed Bragg reflector corresponding to the red sub-pixel and the green sub-pixel, the distributed Bragg reflector comprises a long-pass filter and a short-pass filter, the long-pass filter is positioned at one side of the red quantum dot and the green quantum dot, which is far away from the liquid crystal layer, the short-pass filter is positioned at one side of the red quantum dot and the green quantum dot, which is towards the liquid crystal layer, the long-pass filter can transmit red green light and reflect blue light, and the short-pass filter can transmit blue light and reflect red green light;

the array substrate is provided with a reflecting layer, the projection of part of the blue sub-pixels on the array substrate coincides with at least part of the reflecting layer, and the projection of the other part of the blue sub-pixels on the array substrate is staggered with the reflecting layer.

Further, the projection of a part of the blue sub-pixels on the array substrate coincides with a part of the reflecting layer, the projection of a part of the green sub-pixels on the array substrate coincides with a part of the reflecting layer, and the projections of another part of the blue sub-pixels and another part of the green sub-pixels on the array substrate are staggered with the reflecting layer.

Further, the projection of a part of the blue sub-pixels on the array substrate coincides with a part of the reflecting layer, the projection of a part of the red sub-pixels on the array substrate coincides with a part of the reflecting layer, and the projections of another part of the blue sub-pixels and another part of the red sub-pixels on the array substrate are staggered with the reflecting layer.

Further, the projections of the blue sub-pixels on the array substrate at the left side part and the right side part are overlapped with at least one part of the reflecting layer, and the projections of the blue sub-pixels on the array substrate at the middle part are staggered with the reflecting layer.

Further, the projections of the left part and the right part of the blue sub-pixels on the array substrate are overlapped with part of the reflecting layer, the projections of the green sub-pixels on the array substrate are overlapped with part of the reflecting layer, and the projections of the middle part of the blue sub-pixels and the other part of the green sub-pixels on the array substrate are staggered with the reflecting layer.

Further, the projections of the left part and the right part of the blue sub-pixels on the array substrate are overlapped with part of the reflecting layer, the projections of the red sub-pixels on the array substrate are overlapped with part of the reflecting layer, and the projections of the middle part of the blue sub-pixels and the other part of the red sub-pixels on the array substrate are staggered with the reflecting layer.

Further, the projections of the left part and the right part of the blue sub-pixels on the array substrate are overlapped with part of the reflecting layer, the projections of the red sub-pixels and part of the green sub-pixels on the array substrate are overlapped with part of the reflecting layer, and the projections of the middle part of the blue sub-pixels, the other part of the red sub-pixels and the other part of the green sub-pixels on the array substrate are staggered with the reflecting layer.

Further, scattering particles are mixed in the red quantum dots and the green quantum dots, and the scattering particles have a scattering effect on light.

Further, a common electrode and a plurality of pixel electrodes insulated from the common electrode are arranged on the array substrate, and the pixel electrodes are in one-to-one correspondence with the pixel units.

The application also provides a display device, which comprises a backlight module and the display panel, wherein the backlight module is used for providing a blue light source.

The utility model has the beneficial effects that: the long-pass filter and the short-pass filter corresponding to the red sub-pixel and the green sub-pixel are arranged on the color film substrate, the long-pass filter can transmit red and green light and reflect blue light, the short-pass filter can transmit blue light and reflect red and green light, then the red quantum dots and the green quantum dots are matched, light rays with different colors from the sub-pixels can be reflected between the long-pass filter and the short-pass filter for multiple times, and the corresponding quantum dots excite corresponding colors for multiple times, so that the utilization rate of backlight can be improved; the blue resistor is arranged in the area corresponding to the blue sub-pixel, the reflecting layer is matched, the projection of part of the blue sub-pixel on the array substrate is overlapped with at least one part of the reflecting layer, the projection of the other part of the blue sub-pixel on the array substrate is staggered with the reflecting layer, the ambient light is filtered into blue light when passing through the blue resistor, and the blue light is reflected to the red sub-pixel and the green sub-pixel by the reflecting layer, so that the utilization rate of the ambient light is improved; therefore, the application can improve the utilization ratio of backlight and ambient light, realize the semi-transparent and semi-reflective display effect, and the liquid crystal box is not required to be additionally provided with a 1/4 wave plate and is set to be different in thickness, so that the manufacturing process is simplified, and the production cost is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a display device in an initial state according to a first embodiment of the present utility model;

FIG. 2 is a schematic plan view of a color filter substrate according to an embodiment of the utility model;

FIG. 3 is a second schematic plan view of a color filter substrate according to an embodiment of the present utility model;

FIG. 4 is a schematic plan view of an array substrate according to a first embodiment of the present utility model;

FIG. 5 is a graph showing transmittance of a long-pass filter and a short-pass filter for different light rays according to an embodiment of the present utility model;

FIG. 6 is a graph showing the reflectivity of a short-pass filter for light at different angles of incidence in accordance with an embodiment of the present utility model;

FIG. 7 is a graph showing the reflectivity of a long pass filter for light at different angles of incidence in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic view of a display device in a bright state according to the first embodiment of the utility model;

FIG. 9 is a schematic diagram illustrating an analysis of a backlight when the display device is in a bright state according to the first embodiment of the utility model;

FIG. 10 is a graph showing the transmission intensity of blue light for red and green quantum dots at different thicknesses and contents in accordance with an embodiment of the present utility model;

FIG. 11 is a schematic diagram illustrating an analysis of backlight utilization of red sub-pixels in bright state of a display device according to an embodiment of the utility model;

FIG. 12 is a schematic diagram showing the contrast ratio of the backlight transmittance of a display device according to the first embodiment of the present utility model to that of a display device according to the prior art;

FIG. 13 is a schematic diagram illustrating an analysis of ambient light when the display device is in a bright state according to the first embodiment of the utility model;

fig. 14 is a schematic structural diagram of a display device in an initial state according to a second embodiment of the present utility model;

FIG. 15 is a schematic plan view of an array substrate according to a second embodiment of the present utility model;

fig. 16 is a schematic view of a display device in an initial state according to a third embodiment of the present utility model;

FIG. 17 is a schematic plan view of an array substrate according to a third embodiment of the present utility model;

fig. 18 is a schematic view of a display device in an initial state according to a fourth embodiment of the present utility model;

fig. 19 is a schematic plan view of an array substrate according to a fourth embodiment of the present utility model.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model to achieve the preset purpose, the following detailed description refers to the specific implementation, structure, features and effects of the display panel and the display device according to the present utility model with reference to the accompanying drawings and the preferred embodiments, wherein:

example one

Fig. 1 is a schematic diagram of a display device in an initial state according to a first embodiment of the present utility model. Fig. 2 is a schematic plan view of a color film substrate according to an embodiment of the utility model. FIG. 3 is a schematic diagram of a second planar structure of a color filter substrate according to an embodiment of the present utility model. Fig. 4 is a schematic plan view of an array substrate according to a first embodiment of the utility model.

As shown in fig. 1 to 4, a display panel provided in an embodiment of the utility model includes a color film substrate 10, an array substrate 20 disposed opposite to the color film substrate 10, and a liquid crystal layer 30 disposed between the color film substrate 10 and the array substrate 20. The display panel has a plurality of pixel units distributed in an array, and the plurality of pixel units have a red sub-pixel P1, a green sub-pixel P2 and a blue sub-pixel P3. In the initial state, as shown in fig. 1, the positive liquid crystal molecules in the liquid crystal layer 30 are in a lying posture, that is, the positive liquid crystal molecules in the liquid crystal layer 30 are parallel to the color film substrate 10 and the array substrate 20, and the alignment direction of one side of the color film substrate 10 is parallel or antiparallel to the alignment direction of one side of the array substrate 20. Of course, in other embodiments, the liquid crystal molecules in the liquid crystal layer 30 are negative liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy), and the negative liquid crystal molecules in the liquid crystal layer 30 are in a standing posture and perpendicular to the color film substrate 10 and the array substrate 20, so as to implement the VA display mode.

As shown in fig. 1 and 2, the color film substrate 10 is provided with red quantum dots 131 in a region corresponding to the red sub-pixel P1, green quantum dots 132 in a region corresponding to the green sub-pixel P2, and blue resistors 133 in a region corresponding to the blue sub-pixel P3. Wherein, the red quantum dot 131 can absorb and excite the light with the wavelength smaller than the red light wavelength, and the green quantum dot 132 can absorb and excite the light with the wavelength smaller than the green light wavelength. Preferably, the red quantum dots 131 and the green quantum dots 132 are mixed with scattering particles, the scattering particles have scattering effect on light, the scattering particles can increase the optical path of incident light, improve the utilization rate of backlight and ambient light, and reduce the dosage of the quantum dots.

The color filter substrate 10 is provided with a distributed bragg reflector corresponding to the red sub-pixel P1 and the green sub-pixel P2. The distributed Bragg reflector comprises a long pass filterA wave filter 11 (LPF) and a Short-pass filter 14 (SPF), the Long-pass filter 11 being capable of transmitting red-green light having a wavelength of 500 to 680nm and reflecting blue light having a wavelength of 490nm or less, and the Short-pass filter 14 being capable of transmitting blue light having a wavelength of 490nm or less and reflecting red-green light having a wavelength of 500 to 680 nm. The long-pass filter 11 is located on the side of the red and green quantum dots 131 and 132 facing away from the liquid crystal layer 30, and the short-pass filter 14 is located on the side of the red and green quantum dots 131 and 132 facing toward the liquid crystal layer 30. Wherein the distributed Bragg reflector (distributed Bragg reflector, DBR) is a reflector used in a waveguide, and the long-pass filter 11 and the short-pass filter 14 are made of SiO ₂ (silica) and TiO ₂ (titanium dioxide) as an alternate material, two different bandpass DBRs were achieved by adjusting the thickness of the film and the logarithm. Light is reflected at the interface when passing through different media, the reflectivity is related to the refractive index between the media, so if we stack films with different refractive indexes together periodically, when light passes through the films with different refractive indexes, the light reflected by each layer interferes constructively due to the change of the phase angle, and then combines with each other to obtain strong reflected light. If the number of layers becomes very large and the difference in refractive indices n1, n2, n3 … of the films becomes very small, the light advances as if it were in the same medium, and the reflectance becomes very small. The interference effect is quite pronounced due to the multiple interference of light, and thus the choice of wavelengths becomes very sharp, and such periodic structures are known as distributed bragg reflectors when a grating-like structure is used.

Fig. 5 is a graph showing transmittance of different light rays by a long-pass filter and a short-pass filter in accordance with an embodiment of the present utility model. As shown in fig. 5, a graph R, G, B shows the wavelengths of red, green and blue light, and graphs L and S show the transmittance of the long-pass filter 11 and the short-pass filter 14 to light rays of different wavelengths, respectively. As can be seen from fig. 5, the long-pass filter 11 has a better transmission effect on blue light with the wavelength below 490nm, and the transmittance can reach more than 95%; the short-pass filter 14 has better transmission effect on red and green light with the wavelength of 500-680 nm, and the transmission rate can reach more than 95%. In the prior art, the transmittance of the conventional red color resistance to red light is about 91%, the transmittance of the green color resistance to green light is about 85%, and the transmittance of the blue color resistance to blue light is about 80%.

FIG. 6 is a graph showing the reflectivity of a short-pass filter for light with different incident angles according to an embodiment of the present utility model. FIG. 7 is a graph showing the reflectivity of a long pass filter for light rays with different incident angles according to an embodiment of the present utility model. As shown in fig. 6 and 7, the curves S1, S2, S3, S4 respectively represent the reflectivities of the short-pass filter 14 to white light with the incident angles of 0 °, 20 °, 40 °, 60 °, and the curves L1, L2, L3, L4 respectively represent the reflectivities of the long-pass filter 11 to white light with the incident angles of 0 °, 20 °, 40 °, 60 °, and as can be seen from fig. 6 and 7, the short-pass filter 14 has a reflectivity of up to 98% to red-green light with the incident angle of less than 40 °, and the short-pass filter 14 has a reflectivity of 94% to blue light with the incident angle of 400-500 nm, which contributes to the reflection utilization of blue light, and the long-pass filter 11 has a reflectivity of 94% to blue light with the incident angle of less than 40 °.

Further, the color film substrate 10 is further provided with a black matrix 12, the black matrix 12 corresponds to the scanning lines and the data lines on the array substrate 20, and the red quantum dots 131, the green quantum dots 132 and the blue resistors 133 are spaced apart from each other by the black matrix 12. The color film substrate 10 is further provided with a flat layer covering the long-pass filter 11 and the short-pass filter 14, and the long-pass filter 11 and the short-pass filter 14 are not arranged in the area corresponding to the blue sub-pixel P3, but the flat layer is covered, so that the color film substrate 10 is smoother.

Further, the reflective layer 21 is disposed on the array substrate 20, the projection of a part of the blue sub-pixels P3 on the array substrate 20 coincides with at least a part of the reflective layer 21, and the projection of another part of the blue sub-pixels P3 on the array substrate 20 is staggered with the reflective layer 21.

In this embodiment, as shown in fig. 1 and 4, the projection of the partial blue sub-pixel P3 on the array substrate 20 coincides with the partial reflective layer 21, the projection of the partial green sub-pixel P2 on the array substrate 20 coincides with the partial reflective layer 21, and the projections of the other partial blue sub-pixel P3 and the other partial green sub-pixel P2 on the array substrate 20 are both staggered from the reflective layer 21. Therefore, more blue light of the reflective layer 21 can be emitted to the green sub-pixel P2, and of course, since incident light is emitted to the reflective layer 21 from various angles, the blue light of the reflective layer 21 is reflected towards various angles, so that a small portion of the blue light of the reflective layer 21 is emitted to the red sub-pixel P1, thereby improving the utilization ratio of ambient light. Of course, the reflective layer 21 may be disposed in a region of the black matrix 12 corresponding to the green sub-pixel P2 and the blue sub-pixel P3, so that the reflective layer 21 corresponding to the green sub-pixel P2 and the blue sub-pixel P3 is integrated, and the intensity of the light reflected to the green sub-pixel P2 is improved. The overlapping area of the projection of the blue sub-pixel P3 and the green sub-pixel P2 on the array substrate 20 and the reflective layer 21 can be set according to actual needs, but is not limited thereto.

The array substrate 20 is further provided with a common electrode 22 and a plurality of pixel electrodes 23 insulated from the common electrode 22, and the pixel electrodes 23 are in one-to-one correspondence with the pixel units. The array substrate 20 is defined by a plurality of scan lines (not shown) and a plurality of data lines (not shown) insulated from each other and crossed on a side facing the liquid crystal layer 30 to form a plurality of pixel units, and each pixel unit is provided therein with a pixel electrode 23 and a thin film transistor (not shown), and the pixel electrode 23 is electrically connected to the data line adjacent to the thin film transistor through the thin film transistor. The thin film transistor includes a gate electrode, an active layer, a drain electrode, and a source electrode, wherein the gate electrode is located on the same layer as the scan line and electrically connected to the scan line, the gate electrode is isolated from the active layer by an insulating layer, the source electrode is electrically connected to the data line, and the drain electrode is electrically connected to the pixel electrode 23 by a contact hole.

As shown in fig. 1, in this embodiment, a common electrode 22 is further disposed on a side of the array substrate 20 facing the liquid crystal layer 30, and the common electrode 22 and the pixel electrode 23 are located on different layers and are insulated and isolated by an insulating layer. The common electrode 22 may be located above or below the pixel electrode 23 (the common electrode 22 is shown below the pixel electrode 23 in fig. 2). Preferably, the common electrode 22 is a planar electrode disposed entirely, and the pixel electrode 23 is a block electrode disposed entirely within each pixel unit or a slit electrode having a plurality of electrode bars to form a fringe field switching pattern (Fringe Field Switching, FFS). Of course, in other embodiments, the pixel electrode 23 and the common electrode 22 may be located at the same layer, but they are insulated from each other, each of the pixel electrode 23 and the common electrode 22 may include a plurality of electrode bars, and the electrode bars of the pixel electrode 23 and the electrode bars of the common electrode 22 are alternately arranged with each other to form an In-Plane Switching (IPS); alternatively, in other embodiments, the array substrate 20 is provided with the pixel electrode 23 on a side facing the liquid crystal layer 30, and the color film substrate 10 is provided with the common electrode 22 on a side facing the liquid crystal layer 30 to form a TN mode or a VA mode.

Further, a first polarizer 41 is disposed on a side of the color film substrate 10 away from the liquid crystal layer 30, a second polarizer 42 is disposed on a side of the array substrate 20 away from the liquid crystal layer 30, and a transmission axis of the first polarizer 41 is perpendicular to a transmission axis of the second polarizer 42.

The color film substrate 10 and the array substrate 20 may be made of glass, acrylic, polycarbonate, and other materials. The material of the common electrode 22 and the pixel electrode 23 may be Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) or the like.

The application also provides a display device, which comprises the backlight module 50 and the display panel, wherein the backlight module 50 is used for providing a blue light source. The backlight module 50 includes a control board 51, a blue LED lamp 52 disposed on the control board 51, and a protective layer covering the blue LED lamp 52, where the blue LED lamp 52 is used to emit a blue light source, so as to provide a blue backlight for the display panel.

Fig. 8 is a schematic view of a display device in a bright state according to the first embodiment of the utility model. As shown in fig. 8, in the bright state of the display device, a corresponding gray scale voltage is applied to the pixel electrode 23, a voltage difference is formed between the pixel electrode 23 and the common electrode 22, and a horizontal electric field (E1 in fig. 8) is generated, so that the positive liquid crystal molecules are deflected in the horizontal direction in a direction parallel to the horizontal electric field, the gray scale voltage includes 0 to 255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 23, the pixel unit exhibits different brightness, thereby displaying different pictures.

Fig. 9 is a schematic diagram illustrating an analysis of backlight when the display device is in a bright state according to the first embodiment of the utility model. As shown in fig. 9, for the red and green sub-pixels P1 and P2, the blue backlight BL normally transmits through the short-pass filter 14 and excites the red and green quantum dots 131 and 132 to emit red and green light Lr and Lg, respectively, while the long-pass filter 11 transmits only red and green light and reflects blue light Lb. Since the red quantum dot 131 and the green quantum dot 132 cannot fully convert the blue light Lb at one time (refer to fig. 10), the blue light Lb which is not fully utilized is reflected into the quantum dot, and the red light Lr and the green light Lg are respectively emitted by the red quantum dot 131 and the green quantum dot 132 and are reflected again by the short-pass filter 14, so that the purposes of recycling and high-efficiency light emission, improving the utilization rate of the blue backlight BL and improving the transmittance are achieved. For the blue sub-pixel P3, the blue light Lb can directly pass through the blue resistor 133, and when the reflective layer 21 blocks a portion of the blue backlight BL, but the reflected blue backlight BL is reflected again in the backlight module 50 and directed to the liquid crystal layer 30, and is not absorbed by the reflective layer 21.

Fig. 10 is a graph showing the transmission intensity of blue light at different thicknesses and contents of red quantum dots and green quantum dots according to the first embodiment of the present utility model. Fig. 11 is an analysis diagram of the backlight utilization of the red sub-pixel when the display device is in the bright state according to the first embodiment of the utility model. The intensity of the emitted light I can be expressed as i=i ₀ e ^－βCl Wherein: i ₀ For the initial light intensity (approximately equal to the blue backlight BL intensity), β is the proportionality coefficient, C is the specific gravity (i.e., content) of the quantum dot, and l is the film thickness of the quantum dot.

As shown in fig. 10, R1, R2, and R3 respectively represent the transmission intensities of the red quantum dots 131 with 10%, 20%, and 30% content to the blue light, and the curves G1, G2, and G3 respectively represent the transmission intensities of the green quantum dots 132 with 10%, 20%, and 30% content to the blue light. As can be seen from fig. 10, the quantum dot thickness l is in the range of 0 to 10 μm, and the lower the transmission intensity of blue light (i.e., the lower the luminous flux of blue light is), the higher the conversion rate of blue light is. And red quantum dot 131Unlike the absorption efficiency of the green quantum dot 132 on the blue light Lb, the absorption coefficient of the red quantum dot 131 is larger than that of the green quantum dot 132, and the emission intensities of the red quantum dot 131 and the green quantum dot 132 on the blue light Lb are Irb and Igb, which can be expressed as: irb=i ₀ e ^-1.93Cl ，Igb＝I ₀ e ^-0.88Cl 。

As shown in fig. 11, for the red sub-pixel P1, the blue light Lb excites the red quantum dot 131 to emit red light Lr, and the short-pass filter 14 (SPF) excites the red quantum dot 131 and reflects a portion of the red light Lr emitted toward the liquid crystal layer 30 to exit from the front surface, and the other portion of the red light Lr directly exits from the front surface.

Wherein, the light intensity Ir of the front emitted red light is: ir=0.95× (I _rl +I _r2 )＝0.63×I _b0 (1-e ^-1.93cl ) The method comprises the steps of carrying out a first treatment on the surface of the Similarly, the front green light output intensity Ib is: ib=0.61×i _b0 (1-e ^-0.88cl )。

Fig. 12 is a schematic diagram showing the contrast between the transmittance of the backlight of the display device according to the first embodiment of the utility model and that of the display device according to the prior art. As shown in fig. 12, curves X1 and X2 respectively represent the intensities of green light and red light emitted from the front surface in the prior art, and Y1 and Y2 respectively represent the intensities of green light and red light emitted from the front surface in the present application. As can be seen from fig. 12, the application adopts the distributed bragg reflector and the quantum dot color film, compared with the prior art, the spectral luminous flux of red light and green light is 2.19 times and 2.26 times respectively. Therefore, compared with the prior art, the utilization rate of the backlight is greatly improved.

Fig. 13 is a schematic diagram illustrating an analysis of ambient light when the display device is in a bright state according to the first embodiment of the utility model. As shown in fig. 13, for the red and green sub-pixels P1 and P2, the ambient light HL passes through the blue color block 133 and reflects the blue light Lb through the reflective layer 21, the blue light Lb reflected by the reflective layer 21 faces in various directions, part of the blue light Lb passes through the short-pass filter 14 and excites the red and green quantum dots 131 and 132 to emit red and green light Lr and Lg, respectively, and the long-pass filter 11 transmits only the red and green light Lrg and reflects the blue light Lb. Since the red quantum dot 131 and the green quantum dot 132 cannot fully convert the blue light Lb at one time (refer to fig. 10), the blue light Lb which is not fully utilized is reflected into the quantum dot, and the red quantum dot 131 and the green quantum dot 132 are re-excited to respectively emit red light Lr and green light Lg, and the red light Lrg and the green light Lrg are reflected by the short-pass filter 14 for re-reflection, so that the purposes of recycling high-efficiency light emission, improving the utilization rate of the ambient light HL and improving the penetration rate are achieved. Moreover, the red-green light Lrg in the ambient light HL can directly enter the red quantum dot 131 and the green quantum dot 132 through the long-pass filter 11, wherein the green light Lg can excite the red light Lr through the red quantum dot 131 and be reflected out through the short-pass filter 14, so that the brightness of the red sub-pixel P1 is further improved, the utilization rate of the ambient light HL is provided, and the semi-transparent and semi-reflective display effect is also realized. For the blue sub-pixel P3, the ambient light HL passes through the blue color block 133 and reflects the blue light Lb by the reflection layer 21, and the blue light Lb reflected by the reflection layer 21 is directed in various directions, and part of the blue light Lb passes through the blue color block 133 and is emitted from the front surface.

In summary, by disposing the long-pass filter 11 and the short-pass filter 14 corresponding to the red sub-pixel P1 and the green sub-pixel P2 on the color film substrate 10, the long-pass filter 11 can transmit red and green light and reflect blue light, the short-pass filter 14 can transmit blue light and reflect red and green light, and then the red quantum dots 131 and the green quantum dots 132 are matched, so that light with different colors from the sub-pixels can be reflected between the long-pass filter 11 and the short-pass filter 14 for multiple times and excited into corresponding colors by the corresponding quantum dots for multiple times, thereby improving the utilization rate of backlight; a blue resistor 133 is disposed in the region corresponding to the blue sub-pixel P3, and a reflective layer 21 is disposed in the region corresponding to the blue sub-pixel P3, and the projection of a portion of the blue sub-pixel P3 on the array substrate 20 coincides with at least a portion of the reflective layer 21, while the projection of another portion of the blue sub-pixel P3 on the array substrate 20 is staggered with the reflective layer 21, so that the ambient light is filtered into blue light when passing through the blue resistor 133, and reflected to the red sub-pixel P1 and the green sub-pixel P2 by the reflective layer 21, thereby improving the utilization ratio of the ambient light; therefore, the application can improve the utilization ratio of backlight and ambient light, realize the semi-transparent and semi-reflective display effect, and the liquid crystal box is not required to be additionally provided with a 1/4 wave plate and is set to be different in thickness, so that the manufacturing process is simplified, and the production cost is reduced.

Example two

Fig. 14 is a schematic view of a display device in an initial state according to a second embodiment of the present utility model. Fig. 15 is a schematic plan view of an array substrate according to a second embodiment of the utility model. As shown in fig. 14 and 15, the display panel and the display device provided in the second embodiment of the present utility model are substantially the same as those in the first embodiment (fig. 1 to 13), except that in the present embodiment, the projections of the red sub-pixel P1 and the green sub-pixel P2 on the array substrate 20 are both staggered with respect to the reflective layer 21, i.e. there is no overlapping area. Although the reflection layer 21 reduces the ambient light reflected to the red and green sub-pixels P1 and P2, the area of the reflection layer 21 may be reduced, the shielding of the red and green sub-pixels P1 and P2 by the reflection layer 21 may be reduced, and the intensity of the backlight passing through the red and green sub-pixels P1 and P2 may be increased.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.

Example III

Fig. 16 is a schematic view of a display device in an initial state according to the third embodiment of the present utility model. Fig. 17 is a schematic plan view of an array substrate according to a third embodiment of the present utility model. As shown in fig. 16 and 17, the display panel and the display device provided in the third embodiment of the present utility model are substantially the same as those in the first embodiment (fig. 1 to 13), and are different in that in the present embodiment, the projection of a part of the blue sub-pixel P3 on the array substrate 20 coincides with a part of the reflective layer 21, the projection of a part of the red sub-pixel P1 on the array substrate 20 coincides with a part of the reflective layer 21, and the projections of another part of the blue sub-pixel P3 and another part of the red sub-pixel P1 on the array substrate 20 are both staggered with respect to the reflective layer 21. Thus, the blue light of the reflective layer 21 can be more directed to the red subpixel P1, so as to improve the utilization ratio of the red subpixel P1 to the ambient light and improve the brightness of the red subpixel P1.

Of course, the reflective layer 21 may be disposed in a region of the black matrix 12 corresponding to the red sub-pixel P1 and the blue sub-pixel P3, so that the reflective layer 21 corresponding to the red sub-pixel P1 and the blue sub-pixel P3 is connected as a whole to increase the intensity of the light reflected to the red sub-pixel P1.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.

Example IV

Fig. 18 is a schematic diagram of a display device in an initial state according to the fourth embodiment of the present utility model. Fig. 19 is a schematic plan view of an array substrate according to a fourth embodiment of the present utility model. As shown in fig. 18 and 19, the display panel and the display device provided in the fourth embodiment of the present utility model are substantially the same as those in the first embodiment (fig. 1 to 13), except that in the present embodiment, the projections of the left and right blue sub-pixels P3 on the array substrate 20 overlap with at least a portion of the reflective layer 21, and the projections of the middle blue sub-pixels P3 on the array substrate 20 are offset from the reflective layer 21. That is, the blue sub-pixel P3 is provided with the reflective layer 21 on the side close to the red sub-pixel P1, and the reflective layer 21 is also provided on the side close to the green sub-pixel P2, so that the intensity of the light reflected to the red sub-pixel P1 and the green sub-pixel P2 can be improved. The areas of the left portion, the right portion, and the middle portion of the blue sub-pixel P3 may be set according to practical situations, but are not limited thereto.

In this embodiment, the projections of the left and right blue sub-pixels P3 and P1 and P2 on the array substrate 20 overlap with the partially reflective layer 21, and the projections of the middle blue sub-pixel P3, the other red sub-pixel P1 and the other green sub-pixel P2 on the array substrate 20 are offset from the reflective layer 21. Therefore, the blue light of the reflective layer 21 can be more directed to the red sub-pixel P1 and the green sub-pixel P2, so as to improve the utilization ratio of the red sub-pixel P1 and the green sub-pixel P2 to the ambient light and improve the brightness of the red sub-pixel P1 and the green sub-pixel P2.

Further, the reflective layer 21 may be disposed correspondingly in the region of the black matrix 12 between the red sub-pixel P1 and the blue sub-pixel P3 and between the green sub-pixel P2 and the blue sub-pixel P3, so that the reflective layers 21 corresponding to the red sub-pixel P1 and the blue sub-pixel P3 and the green sub-pixel P2 and the blue sub-pixel P3 are connected as a whole, thereby improving the intensity of the light reflected to the red sub-pixel P1 and the green sub-pixel P2.

In one embodiment, the projections of the left and right blue sub-pixels P3 and P2 on the array substrate 20 overlap the partially reflective layer 21, the projections of the green sub-pixels P2 and P2 on the array substrate 20 overlap the partially reflective layer 21, and the projections of the blue sub-pixels P3 and P2 on the array substrate 20 are offset from the reflective layer 21. The projection of the red sub-pixel P1 on the array substrate 20 is offset from the reflective layer 21, i.e. there is no overlapping area. Although the reflection layer 21 reduces the ambient light reflected toward the red subpixel P1, the area of the reflection layer 21 can be reduced, the shielding of the red subpixel P1 by the reflection layer 21 can be reduced, and the intensity of the backlight passing through the red subpixel P1 can be improved.

In another embodiment, the projections of the left and right blue sub-pixels P3 and P1 on the array substrate 20 are coincident with the partially reflective layer 21, the projections of the red sub-pixel P1 and P1 on the array substrate 20 are coincident with the partially reflective layer 21, and the projections of the blue sub-pixel P3 and P1 on the array substrate 20 are offset from the reflective layer 21. The projection of the green sub-pixel P2 on the array substrate 20 is offset from the reflective layer 21, i.e. there is no overlapping area. Although the reflection layer 21 reduces the ambient light reflected toward the green sub-pixel P2, the area of the reflection layer 21 can be reduced, the shielding of the green sub-pixel P2 by the reflection layer 21 can be reduced, and the intensity of the backlight passing through the green sub-pixel P2 can be improved.

Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.

In this document, terms such as up, down, left, right, front, rear, etc. are defined by the positions of the structures in the drawings and the positions of the structures with respect to each other, for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein. It should also be understood that the terms "first" and "second," etc., as used herein, are used merely for distinguishing between names and not for limiting the number and order.

The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (9)

1. The display panel is characterized by comprising a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10) and a liquid crystal layer (30) arranged between the color film substrate (10) and the array substrate (20), wherein a plurality of pixel units distributed in an array manner are arranged on the display panel, red sub-pixels (P1), green sub-pixels (P2) and blue sub-pixels (P3) are arranged in the pixel units, red quantum dots (131) are arranged in the area corresponding to the red sub-pixels (P1) of the color film substrate (10), green quantum dots (132) are arranged in the area corresponding to the green sub-pixels (P2), and blue resistors (133) are arranged in the area corresponding to the blue sub-pixels (P3);

the color film substrate (10) is provided with a distributed Bragg reflector corresponding to the red sub-pixel (P1) and the green sub-pixel (P2), the distributed Bragg reflector comprises a long-pass filter (11) and a short-pass filter (14), the long-pass filter (11) is positioned at one side of the red quantum dot (131) and the green quantum dot (132) far away from the liquid crystal layer (30), the short-pass filter (14) is positioned at one side of the red quantum dot (131) and the green quantum dot (132) facing the liquid crystal layer (30), the long-pass filter (11) can transmit red green light and reflect blue light, and the short-pass filter (14) can transmit blue light and reflect red green light;

the array substrate (20) is provided with a reflecting layer (21), the projection of part of the blue sub-pixels (P3) on the array substrate (20) coincides with at least one part of the reflecting layer (21), and the projection of the other part of the blue sub-pixels (P3) on the array substrate (20) is staggered with the reflecting layer (21).

2. A display panel according to claim 1, characterized in that part of the projection of the blue sub-pixel (P3) onto the array substrate (20) coincides with part of the reflective layer (21), part of the projection of the green sub-pixel (P2) onto the array substrate (20) coincides with part of the reflective layer (21), and part of the projections of the blue sub-pixel (P3) and part of the projection of the green sub-pixel (P2) onto the array substrate (20) are both offset from the reflective layer (21).

3. A display panel according to claim 1, characterized in that part of the projection of the blue sub-pixel (P3) onto the array substrate (20) coincides with part of the reflective layer (21), part of the projection of the red sub-pixel (P1) onto the array substrate (20) coincides with part of the reflective layer (21), and part of the projections of the blue sub-pixel (P3) and another part of the red sub-pixel (P1) onto the array substrate (20) are both offset from the reflective layer (21).

4. A display panel according to claim 1, characterized in that the projections of the blue sub-pixels (P3) on the array substrate (20) on the left and right side coincide with at least a part of the reflective layer (21), and the projections of the blue sub-pixels (P3) on the array substrate (20) on the middle part are offset from the reflective layer (21).

5. A display panel according to claim 4, characterized in that the projections of the left and right parts of the blue sub-pixel (P3) onto the array substrate (20) coincide with a part of the reflective layer (21), the projection of the green sub-pixel (P2) onto the array substrate (20) coincides with a part of the reflective layer (21), and the projections of the middle part of the blue sub-pixel (P3) and the other part of the green sub-pixel (P2) onto the array substrate (20) are both offset from the reflective layer (21).

6. The display panel according to claim 4, wherein the projections of the left and right part of the blue sub-pixel (P3) onto the array substrate (20) coincide with part of the reflective layer (21), the projection of the red sub-pixel (P1) onto the array substrate (20) coincides with part of the reflective layer (21), and the projections of the middle part of the blue sub-pixel (P3) and the other part of the red sub-pixel (P1) onto the array substrate (20) are both offset from the reflective layer (21).

7. The display panel according to claim 4, wherein the projections of the blue sub-pixel (P3) on the array substrate (20) on the left and right sides coincide with a part of the reflective layer (21), the projections of the red sub-pixel (P1) and a part of the green sub-pixel (P2) on the array substrate (20) coincide with a part of the reflective layer (21), and the projections of the blue sub-pixel (P3), another part of the red sub-pixel (P1) and another part of the green sub-pixel (P2) on the array substrate (20) are offset from the reflective layer (21).

8. A display panel according to any one of claims 1-7, wherein a common electrode (22) and a plurality of pixel electrodes (23) insulated from the common electrode (22) are arranged on the array substrate (20), and the pixel electrodes (23) are in one-to-one correspondence with the pixel units.

9. A display device comprising a backlight (50) and a display panel as claimed in any one of claims 1 to 8, the backlight (50) being adapted to provide a blue light source.