WO2019109603A1

WO2019109603A1 - Quantum dot panel and display apparatus

Info

Publication number: WO2019109603A1
Application number: PCT/CN2018/088072
Authority: WO
Inventors: 李富琳; 宋志成
Original assignee: 青岛海信电器股份有限公司
Priority date: 2017-12-07
Filing date: 2018-05-23
Publication date: 2019-06-13
Also published as: CN107817630A

Abstract

A quantum dot panel (220) and a display apparatus. The quantum dot panel (220) comprises: an upper substrate (221), a quantum dot layer (222), a liquid crystal layer (223) and a lower substrate which are successively arranged from a light-emergent side to a light-incident side. The quantum dot layer (222) is used for generating visible light when excited; the upper substrate (221) is provided with a dye material, so that the upper substrate (221) can filter out light rays having a wavelength smaller than 420 nm; and the weight ratio of the dye material and the substrate is between 0.04 and 0.2. The quantum dot panel (220) and the display apparatus can filter out ultraviolet light and a part of blue light from ambient light when irradiated by the ambient light, and have a high transmittance for light of other wavelengths. The entire display picture still has high contrast and color purity, and the energy loss caused is less.

Description

Quantum dot panel and display device

Related application cross-reference

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present application relates to the field of display technologies, and in particular, to a liquid crystal display device.

Background technique

At present, a novel liquid crystal display device adopts a quantum dot liquid crystal panel including a liquid crystal layer and a quantum dot layer disposed above the liquid crystal layer, and the quantum dot layer includes a plurality of quantum dot pixel unit groups arranged in sequence, and a quantum The dot pixel unit group includes quantum dot pixel units arranged in sequence to convert the backlight correspondingly into three primary colors. The quantum dot layer mainly includes a red pixel unit, a green pixel unit and a blue pixel unit, wherein the red pixel unit is provided with a red quantum dot material; the green pixel unit is provided with a green quantum dot material; and the blue pixel unit is not provided with a quantum dot material. When the blue backlight is irradiated on the three pixel units of red, green and blue, the blue backlight in the blue pixel unit directly transmits blue light; the quantum dot material in the green pixel unit absorbs blue light to be converted into green light, and the red pixel unit The quantum dot material absorbs blue light and converts it into red light.

Summary of the invention

The present application provides a quantum dot panel and a display device, which can reduce the transmittance of the backlight and the contrast of the screen and reduce the energy loss while reducing the excitation of the quantum dot layer in the liquid crystal panel by ultraviolet light and blue light in the ambient light.

In one aspect, the present application provides a quantum dot panel including an upper substrate, a quantum dot layer, a liquid crystal layer, and a lower substrate sequentially arranged from a light exiting side to a light incident side, wherein the quantum dot layer is The invention is characterized in that the upper substrate is provided with a coloring material, so that the upper substrate can filter light having a wavelength of less than 420 nm; and the ratio of the coloring material to the substrate is between 0.04 and 0.2.

In another aspect, the present application provides a display device including a quantum dot panel including an upper substrate, a quantum dot layer, a liquid crystal layer, and a lower substrate arranged in order from a light exiting side to a light incident side. The quantum dot layer is used for being excited to generate visible light; the coloring material is disposed in the upper substrate, so that the upper substrate can filter light having a wavelength of less than 420 nm, and the coloring material and the weight of the substrate The ratio is between 0.04-0.2.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the prior art, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are Some embodiments of the present application can also obtain other drawings based on these drawings without departing from the prior art for those skilled in the art.

1 is a schematic structural diagram of a quantum dot panel according to some embodiments of the present application;

2 is a schematic structural diagram of a display device according to some embodiments of the present application;

3 is a schematic diagram of spectral absorption of an upper substrate in a quantum dot panel according to some embodiments of the present application.

Detailed ways

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application. It is to be noted that the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

The following related art is only a technology related to the present application, and is not a necessary prior art.

When the quantum dot liquid crystal panel of the related art is used, since the ultraviolet light and the blue light portion in the external environment are externally irradiated to the quantum dot layer of the liquid crystal panel, the red quantum dot material in the quantum dot layer is excited to generate red light, green When the quantum dot material is excited, it will produce green light. When the liquid crystal panel displays a black image, red and green light will still emerge from the panel, which affects the contrast of the display and the quality of the panel.

In order to avoid the excitation of ambient light to the red-green quantum dot pixel unit, a related technique uses a pigment material that absorbs red, green, and blue light in red, green, and blue pixel units to absorb other color light, In the technical method, part of the light of the backlight is also absorbed, resulting in lower light transmittance and large energy loss, which is not conducive to saving power.

FIG. 1 is a schematic structural diagram of a quantum dot panel according to some embodiments of the present disclosure. As shown in FIG. 1 , the quantum dot panel 220 of the present embodiment includes an upper substrate 221 sequentially arranged from a light exiting side to a light incident side. a quantum dot layer 222, a liquid crystal layer 223, and a lower substrate (not shown), wherein the quantum dot layer 222 is used to generate visible light; the upper substrate 221 is provided with a coloring material, so that the upper substrate 221 can be Light having a wavelength of less than 420 nm is filtered; the ratio by weight of the coloring material to the substrate is between 0.04 and 0.2.

In some embodiments of the present application, the coloring material comprises at least one of a compound having a cation of Ti ^{4+ and} a compound having a cation of Ce ⁴⁺ .

In some embodiments of the present application, the coloring material comprises a compound having a cation of Ti ^{4+ and} a compound having a cation of Ce ⁴⁺ , wherein the compound having the cation of Ti ⁴⁺ and the cation is The ratio by weight of the compound of Ce ⁴⁺ is between 1 and 6.5.

In some embodiments of the present application, the compound having a cation of Ti ⁴⁺ includes TiO ₂ , and the compound having a cation of Ce ⁴⁺ includes CeO ₂ .

Due to the high refractive index and high photoactivity of Ti ⁴⁺ and Ce ^{4+ , it} has a strong barrier effect on ultraviolet light (ultraviolet light with a wavelength between 280 and 390 nm) in ambient light, and the wavelength range is between 320-390 nm in the long wavelength region. Between the ultraviolet light, the blocking effect of Ti ⁴⁺ and Ce ⁴⁺ on the ultraviolet light in the range is mainly reflected and scattered; for ultraviolet light with a wavelength range between 280-320 nm in the middle wave region, Ti ^{4 +} , Ce ⁴⁺ is mainly absorbed by the ultraviolet light in this range. Whether it is ultraviolet light in the long-wave or medium-wave region, the blocking rate of Ti ⁴⁺ and Ce ⁴⁺ can reach 80%. The above, thereby achieving the effect of ultraviolet light filtering in ambient light; for a mixed light of blue light and ultraviolet light having a wavelength between 390 and 420 nm, the blocking ratio is between 60% and 80%; For blue light in the range of 420-480 nm, the blocking ratio of blue light in the range of Ti ⁴⁺ and Ce ⁴⁺ is less than 60%, between 30% and 60%, so that a large part of ultraviolet light in ambient light Light is filtered, while blue light is partially transmissive and partially filtered; for light with wavelengths greater than 490 nm The upper substrate 221 Ti ⁴⁺ and Ce ⁴⁺ blocking rate is below 10%, this part of the light transmittance at a higher range, the energy loss is small.

The red, green and blue primary color lights emitted from the quantum dot layer 222 have a higher color purity, and the red, green and blue light passes through the upper substrate 221 because the upper substrate 221 has only a specific wavelength (ie, a low wavelength) The light of 420 nm light has a high blocking rate, and the wavelength of the red and green light emitted from the quantum dot layer 222 is not in the range of the above specific wavelength, and therefore, the red and green light still have a high transmittance. Rate, but since the red and green light is excited by the quantum dot material, the conversion rate is less than 100% (usually around 40%), so some red and green light is depleted (this is in the application of quantum The point material produces the necessary loss in the red and green light; and the blue light directly emitted from the quantum dot layer 222 does not pass through the quantum dot material in the quantum dot layer 222, and has a relatively own red-green light. High transmittance, but since the upper substrate 221 can have a partial blocking effect in the second wavelength range, a part of the blue light is blocked, so that the blue light passing through the upper substrate 221 and the red and green light are not different. Large, thus maintaining the color temperature of the white screen of the liquid crystal display device, and controlling the content of Ti ⁴⁺ and Ce ⁴⁺ components in the upper substrate 221 according to actual needs, can control the blocking ratio of blue light between 30% and 60%. In order to meet the needs of different color temperatures.

In some embodiments of the present application, the substrate may comprise clear glass or a transparent plastic.

In some embodiments of the present application, as shown in FIG. 1, the quantum dot layer includes a red pixel unit 222a, a green pixel unit 222b, and a blue pixel unit 222c, and the red pixel unit 222a has a fill wavelength range of 620- A quantum dot material of 660 nm is filled in the quantum dot material having a wavelength range of 520-560 nm, and the quantum dot material is not filled in the blue pixel unit 222c.

It can be understood that the narrower the half-wave width of the quantum dots, the higher the color purity, so try to select quantum dots with a narrow half-width.

In some embodiments of the present application, as shown in FIG. 1, the quantum dot layer includes a red pixel unit 222a, a green pixel unit 222b, and a blue pixel unit 222c, and the red pixel unit 222a has a fill wavelength range of 620- A quantum dot material of 660 nm, the green pixel unit 222b is filled with a quantum dot material having a wavelength ranging from 520 to 560 nm, and the blue pixel unit 222c is filled with scattering particles.

Since the backlight of the general display device is a blue light source, the quantum dot material may not be filled in the blue pixel unit 222c, so that the blue light is directly transmitted, and in order to increase the light exit angle of the blue pixel, it is also considered to be filled in the blue pixel unit 222c. The scattering particles scatter the blue light passing through the blue pixel unit 222c, thereby increasing the viewing angle of the blue pixel.

It can be understood that a black matrix for avoiding cross color between pixels is disposed between the red pixel unit 222a, the green pixel unit 222b, and the blue pixel unit 222c.

It can be understood that the quantum dot panel of the present embodiment may further include a built-in polarizing plate, a transparent electrode, and a liquid crystal alignment layer disposed between the quantum dot layer 222 and the liquid crystal layer 223, and the built-in polarizing plate generally adopts a nano metal wire grid. The polarizing direction may be perpendicular to the lower substrate, and the quantum dot panel may further include a forward electrode disposed between the liquid crystal layer 223 and the lower substrate and a polarizer attached to the outside of the lower substrate, and the polarizer may be an absorptive polarizer. It may also be a reflective polarizer from which light is converted into polarized light.

It can be understood that the quantum dot panel of the embodiment of the present application is not limited to the RGB mode, and may also be a printing color mode (CMYK, cyan, magenta, yellow, black) or other custom mode, different pixels in the quantum dot panel. The unit sets different quantum dot materials.

Advantageous effects of the technical solutions proposed by some embodiments of the present application include: providing a coloring material in the upper substrate 221 of the quantum dot panel 220 such that the upper substrate can filter light having a wavelength of less than 420 nm, and the coloring material and The weight ratio of the substrate is between 0.04-0.2, which reduces the excitation of the quantum dot material in the quantum dot layer 222 by the ambient light, and the entire display image still has high contrast and color purity under ambient light illumination, and The coloring material has a lower blocking rate for light of other wavelengths, which makes the backlight pass higher efficiency and reduces energy loss.

FIG. 2 is a schematic structural diagram of a display device according to some embodiments of the present disclosure. As shown in FIG. 2 , the display device 200 of the present embodiment includes a quantum dot panel 220 , and the quantum dot panel 220 includes a light emitting side. The upper substrate 221, the quantum dot layer 222, the liquid crystal layer 223, and the lower substrate (not shown) are sequentially arranged on the light incident side, and the quantum dot layer 222 is used to generate visible light; the upper substrate 221 is provided with The color material is such that the upper substrate 221 can filter light having a wavelength of less than 420 nm, and the ratio by weight of the coloring material to the substrate is between 0.04 and 0.2. The display device 200 of the embodiment further includes a backlight module 210, and the backlight module 210 includes a backlight 211 and other optical components.

In some embodiments of the present application, the substrate comprises a clear glass or a transparent plastic.

In some embodiments of the present application, the quantum dot layer includes a red pixel unit, a green pixel unit, and a blue pixel unit, and the red pixel unit is filled with a quantum dot material having a wavelength ranging from 620 to 660 nm, and the green pixel The cell is filled with a quantum dot material having a wavelength in the range of 520-560 nm, and the quantum dot material is not filled in the blue pixel cell.

In some embodiments of the present application, the quantum dot layer includes a red pixel unit, a green pixel unit, and a blue pixel unit, and the red pixel unit is filled with a quantum dot material having a wavelength ranging from 620 to 660 nm, and the green pixel The cell is filled with a quantum dot material having a wavelength in the range of 520-560 nm, and the blue pixel cell is filled with scattering particles.

FIG. 3 is a schematic diagram of spectral absorption of an upper substrate in a quantum dot panel according to some embodiments of the present application, and exemplifying the compound having a cation of Ti ^{4+ and} a compound having a cation of Ce ⁴⁺ when the coloring material is exemplified below. When the ratio of the weight ratio of the coloring material to the substrate is different, and the ratio of the weight ratio of the compound having a cation of Ti ^{4+ to} the compound having the cation of Ce ⁴⁺ is different, the blocking ratio of the upper substrate 221 to ultraviolet light and blue light. As shown in FIG. 3, when the weight ratio of the coloring material to the substrate in the upper substrate 221 is 0.048, the ratio of the compound having the cation of Ti ^{4+ to} the compound having the cation of Ce ⁴⁺ is 1, the upper substrate 221 The blocking rate of light with a wavelength between 280-390 nm (ie, ultraviolet light in the environment) is more than 80%, and the blocking rate for light with a wavelength between 420-480 nm (ie, blue light in the environment). About 30%, the blocking rate of light having a wavelength greater than 490 nm (ie, red light and green light in this embodiment) is less than 10%, and the light passing rate is high, and the screen display color temperature of the display device 200 is generally cold. With high color purity and color gamut, the display contrast of the display device 200 is still high in the presence of ambient light, and the loss of light energy is small.

In some embodiments, when the weight ratio of the coloring material to the substrate in the upper substrate 221 is 0.1, the ratio of the compound having the cation of Ti ^{4+ to} the compound having the cation of Ce ⁴⁺ is 4, the upper substrate 221 The barrier rate for light with a wavelength between 280 and 390 nm (ie, ultraviolet light in the environment) is more than 85%, and the rejection rate for light with a wavelength between 420 and 480 nm (ie, blue light in the environment). About 50%, the blocking ratio of light having a wavelength greater than 490 nm (ie, red light and green light in this embodiment) is less than 10%, and the light passing rate is high, and the color temperature of the display device 200 is generally balanced. With higher color purity and color gamut, the display contrast of the display device 200 is still high in the presence of ambient light, and the loss of light energy is small.

In some embodiments, when the weight ratio of the coloring material to the substrate in the upper substrate 221 is 0.2, the ratio of the compound having the cation Ti ^{4+ to} the compound having the cation Ce ⁴⁺ is 6.5, the upper substrate 221 The blocking rate of light with a wavelength between 280-390 nm (ie, ultraviolet light in the environment) is over 90%, and the blocking rate for light with a wavelength between 420-480 nm (ie, blue light in the environment). About 60%, the blocking rate of light having a wavelength greater than 490 nm (ie, red light and green light in this embodiment) is less than 10%, and the light passing rate is high, and the screen display color temperature of the display device 200 is generally warmer. With high color purity and color gamut, the display contrast of the display device 200 is still high in the presence of ambient light, and the loss of light energy is small.

It should be noted that the experimental data in the embodiments of the present application are for illustrative purposes only and do not limit the scope of protection of the present application.

The display device of the embodiment of the present application may be a product or component having any display function, such as an electronic paper, an organic light emitting diode (OLED) panel, a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet computer, or the like.

The beneficial effects of the technical solutions proposed by some embodiments of the present application include: providing a coloring material in the upper substrate 221 of the quantum dot panel 220 in the display device 200 so that the upper substrate 221 can filter light having a wavelength of less than 420 nm. Moreover, the ratio of the weight of the coloring material to the substrate is between 0.04 and 0.2, which reduces the excitation of the quantum dot material in the quantum dot layer 222 by the ambient light, and the entire display image still has a high contrast under ambient light illumination. With color purity, and because the coloring material has a lower blocking rate for other wavelengths of light, the pass efficiency of the backlight is higher, and energy loss is reduced.

The above embodiments are intended to further describe the objects, technical solutions, and advantageous effects of the present application. It is to be understood that the foregoing is only the embodiments of the present application, and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present application.

Claims

A quantum dot panel comprising an upper substrate, a quantum dot layer, a liquid crystal layer and a lower substrate arranged in order from a light exiting side to a light incident side, wherein the quantum dot layer is used for excitation generation Visible light; a coloring material is disposed in the upper substrate such that the upper substrate can filter light having a wavelength of less than 420 nm; and the ratio by weight of the coloring material to the substrate is between 0.04 and 0.2.
The quantum dot panel according to claim 1, wherein the coloring material comprises at least one of a compound having a cation of Ti 4+ and a compound having a cation of Ce 4+ .
The quantum dot panel according to claim 2, wherein the coloring material comprises a compound having a cation of Ti 4+ and a compound having a cation of Ce 4+ , wherein the cation is Ti 4+ The ratio by weight of the compound to the compound having the cation Ce 4+ is between 1 and 6.5.
The quantum dot panel according to claim 2 or 3, wherein the compound having a cation of Ti 4+ includes TiO 2 , and the compound having a cation of Ce 4+ includes CeO 2 .
The quantum dot panel according to any one of claims 2 to 4, wherein the substrate comprises transparent glass or transparent plastic.
The quantum dot panel according to any one of claims 1 to 5, wherein the quantum dot layer comprises a red pixel unit, a green pixel unit, and a blue pixel unit, wherein the red pixel unit has a filling wavelength range of A quantum dot material of 620-660 nm, wherein the green pixel unit is filled with a quantum dot material having a wavelength ranging from 520 to 560 nm, and the quantum dot material is not filled in the blue pixel unit.
The quantum dot panel according to any one of claims 1 to 5, wherein the quantum dot layer comprises a red pixel unit, a green pixel unit, and a blue pixel unit, wherein the red pixel unit has a filling wavelength range of A quantum dot material of 620-660 nm, the green pixel unit is filled with a quantum dot material having a wavelength ranging from 520 to 560 nm, and the blue pixel unit is filled with scattering particles.
A display device comprising a quantum dot panel, the quantum dot panel comprising an upper substrate, a quantum dot layer, a liquid crystal layer and a lower substrate arranged in order from the light exiting side to the light incident side, wherein the quantum dot layer is used The visible light is generated by the excitation; the coloring material is disposed in the upper substrate, so that the upper substrate can filter light having a wavelength of less than 420 nm, and the ratio of the coloring material to the substrate is between 0.04 and 0.2.
The display device according to claim 8, wherein the coloring material comprises at least one of a compound having a cation of Ti 4+ and a compound having a cation of Ce 4+ .
The display device according to claim 9, wherein said coloring material comprises said compound having a cation of Ti 4+ and said compound having a cation of Ce 4+ , wherein said cation is a compound of Ti 4+ The ratio by weight of the compound having the cation Ce 4+ is between 1 and 6.5.
The display device according to claim 9 or 10, wherein the compound having a cation of Ti 4+ includes TiO 2 , and the compound having a cation of Ce 4+ includes CeO 2 .
The display device according to any one of claims 8 to 11, wherein the substrate comprises transparent glass or transparent plastic.
The display device according to any one of claims 8 to 12, wherein the quantum dot layer comprises a red pixel unit, a green pixel unit and a blue pixel unit, and the red pixel unit has a filling wavelength range of 620. a quantum dot material of -660 nm filled with a quantum dot material having a wavelength in the range of 520-560 nm, which is not filled with quantum dot material.
The display device according to any one of claims 8 to 12, wherein the quantum dot layer comprises a red pixel unit, a green pixel unit and a blue pixel unit, and the red pixel unit has a filling wavelength range of 620. a quantum dot material of -660 nm filled with a quantum dot material having a wavelength ranging from 520 to 560 nm, the blue pixel unit being filled with scattering particles.
The display device according to any one of claims 8 to 13, wherein the display device further comprises a backlight module, the backlight module comprises a backlight, and the backlight has a peak value of 440-460 nm. Blue LED light source.