CN216622753U - Circular polarizer for OLED display and OLED display - Google Patents
Circular polarizer for OLED display and OLED display Download PDFInfo
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- CN216622753U CN216622753U CN202220228362.6U CN202220228362U CN216622753U CN 216622753 U CN216622753 U CN 216622753U CN 202220228362 U CN202220228362 U CN 202220228362U CN 216622753 U CN216622753 U CN 216622753U
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Abstract
The circular polarizer for the OLED display comprises a cholesteric liquid crystal film, a wide-wave-domain phase difference compensation film and a polarizing plate which are sequentially stacked, wherein the wide-wave-domain phase difference compensation film is a liquid crystal coating type phase difference compensation film or an extension type phase difference compensation film. The circular polarizer for the OLED display and the OLED display solve the problem of light leakage caused by narrow wave field, improve the utilization rate of light emission of an organic layer of the OLED display, improve the light utilization rate by more than 30 percent, reduce the energy consumption of an organic light emitting layer, and correspondingly greatly improve the single use time and the whole service life of mobile power supply electronic equipment.
Description
Technical Field
The utility model relates to the field of circular polarizer design, in particular to a circular polarizer for an OLED (organic light emitting diode) display and the OLED display.
Background
Organic 1-light emitting diodes (organic 1-light emitting diodes) have the advantages of flexible preparation, low driving voltage, low power consumption and the like, and the technology has been greatly advanced and has a wide application prospect in recent years, so that the organic 1-light emitting diodes become one of the hottest research topics in the development of flat panel displays, novel lighting, wearable and intelligent electronic products.
OLED display technology has many advantages compared to LCDs, and high performance, fast response, etc. far exceed LCDs in terms of OLED characteristics. LCD displays require a backlight module and upper and lower polarizers to generate effective information. The OLED is used as an organic light emitting diode, a backlight module is not needed, the structure is relatively simple, and the OLED is always considered as a perfect display. However, there are some disadvantages, such as low luminous efficiency of blue light material, influence of ambient light, reflection of light in the room or under strong external light, interference of reading, and dark state. At present, a circular polarizer capable of resisting ambient light reflection is generally added to effectively resist ambient light and reduce interference in display.
At present, the composition of the circular polarizer is generally that the linear polarizer is matched with an 1/4 wavelength phase film, but light leakage caused by wavelength change of the 1/4 wavelength phase film is a big problem. Also, light emitted from the organic layer of the OLED is absorbed by 50% when passing through the existing circular polarizer, resulting in low light transmittance.
Therefore, the improvement of the circular polarizer to fully improve the light utilization rate of the light emitting layer of the OLED display and reduce the screen power consumption becomes an important subject of current research.
SUMMERY OF THE UTILITY MODEL
Based on the above, the utility model provides a circular polarizer for an OLED display and the OLED display, and aims to solve the problems of light leakage of the existing polarizing plate, low light utilization rate of light emitted by an OLED organic layer, high screen power consumption and low light transmittance.
In order to achieve the above object, the present invention provides a circular polarizer for an OLED display, comprising a cholesteric liquid crystal film, a wide-domain phase difference compensation film and a polarizing plate, which are sequentially stacked, wherein the wide-domain phase difference compensation film is a liquid crystal coating type phase difference compensation film or an extended type phase difference compensation film, Re (450)/Re (550) of the wide-domain phase difference compensation film is 0.7 to 0.9, Re (650)/Re (550) of the wide-domain phase difference compensation film is 1.1 to 1.4, and Re (550) of the wide-domain phase difference compensation film is 80 to 190 nm.
As a further preferable technical scheme of the utility model, the thickness of the liquid crystal coating type phase difference compensation film is 0.1-10 um; the thickness of the extension type phase difference compensation film is 15-60 um.
As a further preferable embodiment of the present invention, the extended phase difference compensation film has a multilayer composite structure.
In a more preferred embodiment of the present invention, the polarizing plate is an iodine-based polarizing plate.
In a further preferred embodiment of the present invention, the cholesteric liquid crystal film has a single-layer structure or a multilayer composite structure.
In a further preferred embodiment of the present invention, the reflection wavelength of the cholesteric liquid crystal film is in a range of 370nm to 780 nm.
In a further preferred embodiment of the present invention, the reflection bandwidth of the cholesteric liquid crystal film is between 50 and 400 nm.
In a further preferred embodiment of the present invention, an adhesive layer is further disposed between any two adjacent layers of the cholesteric liquid crystal film, the wide-wavelength-domain phase difference compensation film, and the polarizing plate.
According to another aspect of the utility model, the utility model further provides an OLED display, which includes any one of the circular polarizing plates for OLED displays, and the circular polarizing plate is attached to the touch layer of the OLED display through a cholesteric liquid crystal film of the circular polarizing plate.
According to the circular polarizer for the OLED display and the OLED display, by adopting the technical scheme, the problem of light leakage caused by narrow wave field is solved, the utilization rate of light emission of an organic layer of the OLED display is improved, the light utilization rate is improved by more than 30%, the energy consumption of the organic light emitting layer is reduced, and accordingly, the use and standby time of the mobile power supply electronic equipment can be greatly prolonged, and the whole service life of the mobile power supply electronic equipment can be greatly prolonged.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is an exploded view of a circular polarizer of the present invention applied to an OLED display;
FIG. 2 is a schematic diagram of a light passing path when natural light is irradiated to a circular polarizer;
fig. 3 is a schematic diagram illustrating a light passing path when light emitted from the organic layer is irradiated to the circular polarizer.
In the figure: 1. a polarizer, 2, a wide wave-domain phase difference compensation film, 3, a cholesteric liquid crystal film, 4 and a metal electrode.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific embodiments. In the preferred embodiments, the terms "upper", "lower", "left", "right", "middle" and "a" are used for clarity of description only, and are not used to limit the scope of the utility model, and the relative relationship between the terms and the terms is not changed or modified substantially without changing the technical content of the utility model.
The terms and symbols in the present invention are defined as follows:
(1) refractive index (nx, ny, nz)
"nx" is a refractive index in a direction in which the in-plane refractive index is largest (i.e., the slow axis direction), "ny" is a refractive index in a plane and a slow axis
The refractive index in the orthogonal direction (i.e., the fast axis direction), "nz" is the refractive index in the thickness direction.
(2) In-plane retardation (Re)
"Re (. lamda)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of. lamda.nm. For example, "Re (550)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of 550nm, and Re (λ) can be obtained by the formula Re (λ) = (nx-ny) × d, assuming that the thickness of the layer (film) is d (nm).
As shown in fig. 1, the present invention provides a circular polarizer for an OLED display, which includes a cholesteric liquid crystal film 3, a wide-domain phase difference compensation film 2, and a polarizing plate 1, which are sequentially stacked, wherein adhesive layers for stacking and bonding are disposed between the cholesteric liquid crystal film 3 and the wide-domain phase difference compensation film 2, and between the wide-domain phase difference compensation film 2 and the polarizing plate 1. The wide-wavelength-range retardation compensation film 2 is a liquid crystal coating type retardation compensation film or an extension type retardation compensation film, Re (450)/Re (550) of the wide-wavelength-range retardation compensation film 2 is 0.7-0.9, Re (650)/Re (550) is 1.1-1.4, Re (550) is 80-190 nm, and the polarizing plate 1 is an iodine polarizing plate 1. When the circular polarizer is applied to the OLED display, the cholesteric liquid crystal film 3 is attached to a touch layer of the OLED display.
The wide wave-domain phase difference compensation film 2 adopts a liquid crystal coating type phase difference compensation film or an extension type phase difference compensation film, and aims to solve the problem of light leakage of the existing circular polarizer caused by narrow wave domain. The liquid crystal coating type phase difference compensation film has good optical compensation characteristic, easy adjustment and thin thickness, can achieve the effect like oblique extension through oblique alignment liquid crystal, greatly reduces the preparation difficulty, can also realize roll-to-roll lamination with the polarizing plate 1, and further reduces the cost. The thickness of the liquid crystal coating type phase difference compensation film is 0.1-10 um. Because the extended retardation compensation film is mostly in a narrow wavelength range, the requirement of a wide wavelength range is met by a multi-layer composite method, and thus, the thickness of the extended retardation compensation film obtained by multi-layer composite is 15-60 um.
The structure principle of the circular polarizer for the OLED display is as follows:
when external environment light (natural light) irradiates the surface of the polarizing plate 1, the natural light can be decomposed into light vertical to the absorption axis of the polarizing plate 1 and light parallel to the absorption axis of the polarizing plate 1, wherein the light parallel to the absorption axis of the polarizing plate 1 is absorbed, the light vertical to the absorption axis of the polarizing plate 1 can pass through the polarizing plate 1, since the wavelength range of the environment light covers a very wide range, and the wide-wavelength-domain phase difference compensation film 2 can cover most of the visible light region, most of the passed environment light can be converted into left-handed circular polarized light or right-handed circular polarized light through the wide-wavelength-domain phase difference compensation film 2, and then the left-handed circular polarized light is selectively passed through the cholesteric liquid crystal film 3 and reflected by the left-handed circular polarized light or by the right-handed circular polarized light and reflected by the cholesteric liquid crystal film 3, wherein the circular polarized light passed through the cholesteric liquid crystal film 3 is changed in rotation direction after being reflected by the metal electrode 4, after being reflected for a plurality of times, the light is converted into circular polarized light which can rotate through the cholesteric liquid crystal film 3, passes through the wide wave-domain phase difference compensation film 2 again, is converted into light which is parallel to the transmission axis 1 of the polarizing plate, and the environment light at the moment is reflected for a plurality of times and is remained for a plurality of times of transmission.
The light emitted by the organic layer of the OLED display selectively passes through the cholesteric liquid crystal film 3 and reflects the right-handed circular polarized light, or passes through the left-handed circular polarized light and reflects the right-handed circular polarized light, the passed circular polarized light is converted into light parallel to the polarizing plate 1 through the wide-wave-domain phase difference compensation film 2 and is emitted, the circular polarized light which does not pass through the opposite rotation property of the cholesteric liquid crystal film 3 is reflected by the cholesteric liquid crystal film 3 and rebounds to the metal electrode 4, the rotation property of the rebounded circular polarized light can be changed through the reflection of the metal electrode 4, the rotation property of the rebounded circular polarized light is converted into the rotation property which can pass through the cholesteric liquid crystal film 3, and the light follows the path of the previous transmitted light to be emitted as a second pass light.
Based on the principle, the circular polarizer for the OLED display can effectively solve the problems of light leakage caused by narrow wave field of the existing circular polarizer, low light utilization rate and low light transmittance of the organic layer of the OLED display, can improve the light utilization rate of the organic layer of the OLED display by more than 30 percent, reduces the energy consumption of an organic light-emitting layer, and can correspondingly greatly improve the single use time and the whole service life of the electronic equipment using the mobile power supply.
Specifically, the reflection wavelength of the cholesteric liquid crystal film 3 is between 370nm and 780nm, and the reflection bandwidth is between 50nm and 500 nm.
Preferably, the cholesteric liquid crystal film 3 is a single-layer structure or a multi-layer composite structure. When the cholesteric liquid crystal film is of a single-layer structure, the cholesteric liquid crystal film 3 further comprises a chiral compound, and the doping concentration of the chiral compound in the cholesteric liquid crystal film 3 is gradually increased or decreased from one side of the cholesteric liquid crystal film 3 to the other side; when the cholesteric liquid crystal film 3 has a multilayer structure, the cholesteric liquid crystal film 3 includes at least one blue light brightness enhancement film, or/and at least one green light brightness enhancement film, or/and at least one red light brightness enhancement film, which are laminated and bonded.
According to the characteristics of optical rotation, selectivity, light scattering property, circular polarization dichroism and the like of the cholesteric liquid crystal film 3, visible light can be divided into left-handed circular polarized light or right-handed circular polarized light, and the problems of low light utilization rate, high screen energy consumption and low light transmittance of an organic layer of the OLED display are further solved by reflecting the circularly polarized light which has opposite rotation property with the cholesteric liquid crystal film 3.
In order to further understand the disclosure of the present invention, natural light and the change of the polarization state of light emitted from the organic layer of the OLED display in the circular polarizer will be described in detail below.
First, the polarization state of the external natural light in the circular polarizer changes, referring to the schematic diagram of the light passing path shown in fig. 2, in the diagram, the small sun is the natural light, and the lead with an arrow is the light passing path. It is assumed that the cholesteric liquid crystal film 3 in this path reflects the right-handed circularly polarized light by the left-handed circularly polarized light.
When external environment light irradiates the surface of the polarizing plate 1, natural light can be decomposed into light perpendicular to the absorption axis 1 of the polarizing plate and light parallel to the absorption axis 1 of the polarizing plate, the light parallel to the absorption axis 1 of the polarizing plate is absorbed, the light perpendicular to the absorption axis 1 of the polarizing plate can pass through the polarizing plate 1, since the wavelength range of the environment light covers a very wide range, and the wide-domain phase difference compensation film 2 can cover most of the visible light region, therefore, most of the passed environment light can be converted into left-handed circular polarized light through the wide-domain phase difference compensation film 2 in the present embodiment, then, the cholesteric liquid crystal film 3 passes through the left-handed circular polarized light and reflects the right-handed circular polarized light, wherein the passed left-handed circular polarized light is partially reflected by the metal electrode 4 to become right-handed circular polarized light, and is reflected back to the metal electrode 4 by the cholesteric liquid crystal film 3 to become left-handed circular polarized light again, the cholesteric liquid crystal film 3 is changed into linear polarization light parallel to the polarizing plate penetrating axis 1 through the wave domain phase difference compensation film 2, and the linear polarization light passes through the multilayer film after multiple reflections, so that the external environment light is remained, and the structure can well shield the external environment light.
Second, the polarization state of light emitted from the organic layer of the OLED display changes in the circular polarizer, and referring to fig. 3, a schematic diagram of a light passing path is shown, in which a small sun is natural light, and a lead line with an arrow is a light passing path. It is assumed that the cholesteric liquid crystal film 3 in this path reflects the right-handed circularly polarized light by the left-handed circularly polarized light.
The light emitted by the OLED organic layer selectively passes through the left-handed circular polarized light and reflects the right-handed circular polarized light through the cholesteric liquid crystal film 3, the passed left-handed circular polarized light is converted into the light vertical to the absorption axis 1 of the polarizing plate through the wide wave domain phase difference compensation film 2 and then emitted, the opposite circular polarized light which does not pass through the cholesteric liquid crystal film 3 can be reflected by the cholesteric liquid crystal film 3 and rebounded to the metal electrode 4, the rotation of the rebounded circular polarized light can be changed through reflection of the metal electrode 4, the rotation of the rebounded circular polarized light is converted into the rotation of the cholesteric liquid crystal film 3, and the rotation of the rebounded circular polarized light follows the previous path of the penetrating light to be the second path to penetrate through the polarizing plate 1 and then emitted, so that the problems of low light utilization rate and low light transmittance of the organic layer of the OLED display are solved, and the light utilization rate is improved by more than 30%.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims.
Claims (9)
1. The circular polarizer for the OLED display is characterized by comprising a cholesteric liquid crystal film, a wide-wave-domain phase difference compensation film and a polarizing plate which are sequentially stacked, wherein the wide-wave-domain phase difference compensation film is a liquid crystal coating type phase difference compensation film or an extension type phase difference compensation film and can be of a single-layer or multi-layer structure, the Re (450)/Re (550) of the wide-wave-domain phase difference compensation film is 0.7-0.9, the Re (650)/Re (550) is 1.1-1.4, and the Re (550) is 80-190 nm.
2. The circular polarizer according to claim 1, wherein the liquid crystal coated type retardation compensation film has a thickness of 0.1 to 10 um; the thickness of the extension type phase difference compensation film is 15-60 um.
3. The circular polarizer for OLED display according to claim 2, wherein the extension type phase difference compensation film is a multi-layer composite structure.
4. The circular polarizer according to claim 1, wherein the polarizing plate is an iodine-based polarizing plate.
5. The circular polarizer for OLED display according to claim 1, wherein said cholesteric liquid crystal film is a single layer structure or a multi-layer composite structure.
6. The circular polarizer for OLED display according to claim 1, wherein the reflection wavelength of said cholesteric liquid crystal film is between 370nm and 780 nm.
7. The circular polarizer for OLED display according to claim 1, wherein the reflection bandwidth of said cholesteric liquid crystal film is between 50-400 nm.
8. The circular polarizer according to claim 1, wherein an adhesive layer is further provided between any two adjacent layers of the cholesteric liquid crystal film, the wide-wavelength-domain retardation compensation film and the polarizing plate.
9. An OLED display, characterized in that, the OLED display includes the circular polarizer for OLED display of any one of claims 1-8, the circular polarizer is attached to the touch layer of the OLED display through its cholesteric liquid crystal film.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079332A (en) * | 2022-08-18 | 2022-09-20 | 西安明为光学科技有限公司 | Brightness enhancement film and OLED display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115079332A (en) * | 2022-08-18 | 2022-09-20 | 西安明为光学科技有限公司 | Brightness enhancement film and OLED display device |
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