CN218868603U

CN218868603U - OLED display module and electronic equipment

Info

Publication number: CN218868603U
Application number: CN202223295328.XU
Authority: CN
Inventors: 张健民
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-04-14
Anticipated expiration: 2032-12-08

Abstract

The application provides an OLED display module and electronic equipment. The OLED display module comprises an OLED light-emitting layer, a quarter-wave plate, a first mirror layer, a linear polarizer and a second mirror layer. The light emitted by the OLED light-emitting layer comprises a first linearly polarized light and a second linearly polarized light. The quarter-wave plate is arranged on one side of the OLED light emitting layer. The first mirror surface layer is arranged on one side of the quarter-wave plate, which is far away from the OLED light emitting layer. The linear polaroid is arranged on one side, away from the OLED light emitting layer, of the first mirror layer. The second mirror layer is arranged on one side, away from the OLED light emitting layer, of the linear polarizer, and the vibration direction of the first linearly polarized light is the same as the direction of the transmission shaft. According to the light-emitting diode, the first mirror surface layer is additionally arranged between the linear polarizer and the quarter-wave plate, so that the second linearly polarized light is converted into the first linearly polarized light and is emitted, the light extraction efficiency is improved, and the power consumption is reduced.

Description

OLED display module and electronic equipment

Technical Field

The application belongs to the technical field of mirror surface display, and in particular relates to an OLED display module and electronic equipment.

Background

The mirror surface display technology is a display technology that a display module has a mirror-like reflection effect when the display module is turned off, and has no difference with a conventional display module when the display module is turned on, is applied to various fields and equipment, and is popular with users. However, the current mirror display technology has large power consumption.

SUMMERY OF THE UTILITY MODEL

In view of this, the first aspect of the present application provides an OLED display module, including:

the OLED light-emitting layer emits light rays comprising a first linearly polarized light and a second linearly polarized light;

the quarter-wave plate is arranged on one side of the OLED light emitting layer;

the first mirror surface layer is arranged on one side, away from the OLED light emitting layer, of the quarter-wave plate, the first mirror surface layer is provided with a first reflection axis, and the vibration direction of the second linearly polarized light is the same as the direction of the first reflection axis;

the linear polarizer is arranged on one side, away from the OLED light emitting layer, of the first mirror surface layer;

the second mirror layer is arranged on one side, away from the OLED light emitting layer, of the linear polarizer, the directions of transmission axes of the first mirror layer, the linear polarizer and the second mirror layer are the same, and the vibration direction of the first linearly polarized light is the same as the direction of the transmission axis.

The OLED display module that this application first aspect provided can realize the mirror surface display technique at first through setting up in the second mirror layer that linear polaroid deviates from OLED luminescent layer one side, has the reflection effect like the mirror when making OLED luminescent layer not luminous, and its light can pass second mirror layer display picture when OLED luminescent layer is luminous.

Secondly, this application has still add first mirror layer on the basis of second mirror layer, and first mirror layer's effect is the same with second mirror layer, all can make partly light reflect to make another part's light transmit, pass first mirror layer promptly. For example, the first mirror layer has a first reflection axis and a transmission axis, and linearly polarized light can be reflected on the first mirror layer when the vibration direction of the linearly polarized light is parallel to the direction of the first reflection axis. When the direction of oscillation of the linearly polarized light is parallel to the direction of the transmission axis, the linearly polarized light may pass through the first mirror layer. The OLED light-emitting layer emits light rays comprising first linearly polarized light and second linearly polarized light, the vibration direction of the first linearly polarized light is the same as the direction of the transmission shaft, and the vibration direction of the second linearly polarized light is the same as the direction of the first reflection shaft.

In summary, based on the present application, the first mirror layer is disposed between the linear polarizer and the quarter-wave plate, and the light extraction efficiency is increased by the cooperation of the first mirror layer, the second mirror layer, and the quarter-wave plate. Specifically, when the OLED light-emitting layer emits light, the light passes through the quarter-wave plate to the first mirror layer, and the first linearly polarized light can pass through the first mirror layer, the linear polarizer, and the second mirror layer in sequence and exit. The second linearly polarized light will be reflected on the first mirror layer and pass through the quarter-wave plate again, the second linearly polarized light is converted into circularly polarized light and has the first handedness. The circularly polarized light can then be reflected on the metal electrode layer in the light-emitting layer of the OLED, still circularly polarized light but with a second handedness, the first handedness being opposite to the second handedness. The circularly polarized light then passes through the fourth wave plate again, so that the circularly polarized light is converted into the first linearly polarized light. Therefore, the converted first linearly polarized light can sequentially pass through the first mirror layer, the linear polarizer and the second mirror layer and then is emitted.

To sum up, compare in the correlation technique in second linearly polarized light is absorbed by linear polarization piece, this application makes second linearly polarized light change into first linearly polarized light and jets out through addding first mirror layer between linear polarization piece and quarter-wave plate, has improved light and has taken out efficiency, has reduced the consumption.

The second aspect of the present application provides an electronic device, which includes a housing, a processor, and an OLED display module according to the first aspect of the present application, the OLED display module is installed in the housing, and an accommodation space is formed by enclosing the housing, the processor is installed in the accommodation space, and the processor is electrically connected to the OLED display module.

The electronic equipment that this application second aspect provided through adopting the OLED display module that this application first aspect provided, can improve light and take out efficiency, reduces the consumption, improves electronic equipment's duration, improves electronic equipment's competitiveness.

Drawings

In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic perspective view of an OLED display module according to an embodiment of the present disclosure.

Fig. 2 isbase:Sub>A schematic cross-sectional view of the OLED display module shown in fig. 1 alongbase:Sub>A-base:Sub>A direction.

Fig. 3 is a circuit diagram of the OLED display module shown in fig. 2 when ambient light is emitted after the first mirror layer and the second mirror layer are removed.

FIG. 4 is a schematic circuit diagram of a portion of the OLED display module shown in FIG. 2 when ambient light is incident thereon.

Fig. 5 is a schematic circuit diagram of light emitted by the OLED light-emitting layer in the OLED display module shown in fig. 2.

Fig. 6 is a schematic view of a portion of a circuit diagram of an OLED display module according to another embodiment of the present disclosure when ambient light is incident thereon.

Fig. 7 is a schematic partial cross-sectional view of an OLED display module according to an embodiment of the present disclosure.

FIG. 8 is a schematic cross-sectional view of a portion of an OLED display module according to another embodiment of the present disclosure.

Fig. 9 is a schematic cross-sectional view of an OLED display module according to another embodiment of the present disclosure.

FIG. 10 is a schematic cross-sectional view of an OLED display module according to still another embodiment of the present application.

FIG. 11 is a schematic cross-sectional view of an OLED display module according to still another embodiment of the present application.

Fig. 12 is a schematic cross-sectional view of an OLED display module according to still another embodiment of the present disclosure.

Fig. 13 is a schematic perspective view of an electronic device according to an embodiment of the present application.

Fig. 14 is a partial cross-sectional view of the electronic device shown in fig. 13 along the direction B-B.

Description of reference numerals:

the OLED display device comprises an OLED display module-1, electronic equipment-2, a shell-3, a processor-4, first linearly polarized light-P1, second linearly polarized light-S1, third linearly polarized light-S2, fourth linearly polarized light-P2, circularly polarized light-R, an OLED light emitting layer-10, a quarter wave plate-20, a first mirror layer-30, a first refractive index layer-31, a second refractive index layer-32, a refraction group-33, a linear polarizer-40, a second mirror layer-50, a light-transmitting cover plate-60, a light-transmitting protective layer-70, a touch layer-80 and a containing space-90.

Detailed Description

The following is a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

Before the technical solutions of the present application are introduced, the technical problems in the related art will be described in detail.

The mirror display technology is a display technology with high mirror reflectivity, and the mirror reflectivity is not less than 50%. Particularly, the display module has a mirror-like reflection effect when the screen is turned off, so that a user can use the display module as a mirror. And when the display module is bright, the display module is the same as the conventional display module, and a user can normally see the display picture. In other words, the mirror display module can be switched between two states of the mirror and the display screen, and is applied to various fields and equipment, and is popular with users.

When the mirror surface display technology is applied to the display module, the commonly used mirror surface display scheme mainly has two kinds: in the first scheme, a high-reflection film with a thickness of less than 100nm is formed on a cover plate by using a non-conductive vacuum plating (NCVM) technique, and the NCVM film can realize a high-reflection mirror effect. In the second scheme, two optical films with different high/low refractive indexes can be stacked alternately to form a multilayer film structure, which can be called a mirror layer structure. The natural light is refracted and reflected when passing through each layer, and the natural light gradually becomes a linearly polarized light state after multiple times of passing. In short, the multilayer film structure can respectively change the transmitted light and the reflected light of natural light into a state close to linearly polarized light, thereby realizing reflection close to 50% of the natural light and realizing a mirror effect.

With the increasing update of other electronic devices such as mobile phones and 5G technologies, the electronic devices have an increasing demand for power consumption, and the reduction of screen display power consumption becomes a key point of technology research and development. However, in the mirror display technology, the power consumption problem of the display module using the above two schemes is more severe, which mainly includes two reasons: the first aspect is due to the increase in power consumption of the display module itself. For example, in the first embodiment, both the reflectance and transmittance of the NCVM film are about 50%, i.e., only 50% of the light emitted from the light-emitting layer can pass through the NCVM film. In this case, if the screen strength is to be the same as that when the NCVM film is not provided, it is necessary to increase the power consumption by 50%. In the second embodiment, the mirror layer has a high transmittance of 90% or more, but cannot have a transmittance of 100%. In other words, the transmittance of the display module is necessarily reduced by adding an additional layer of structure, which is equivalent to increasing the power consumption by about 5%.

The second aspect is the increase of power consumption due to the mirror application scenario, and it is known from the above that the mirror display technology reflects a part of ambient light to have the effect of mirror reflection when the screen is turned off. However, when the screen is bright, a part of ambient light is still reflected, which results in a need for a higher screen brightness in order to clearly see the display image on the display module.

In summary, the power consumption of the display module in the related art is high, the cruising ability of the whole machine is reduced, and the competitiveness of the whole machine is reduced.

In view of the above, in order to solve the above problems, the present application provides an OLED display module. Referring to fig. 1 to 5 together, fig. 1 is a schematic perspective view illustrating an OLED display module according to an embodiment of the present disclosure. FIG. 2 isbase:Sub>A schematic cross-sectional view of the OLED display module shown in FIG. 1 along the A-A direction. Fig. 3 is a circuit diagram of the OLED display module shown in fig. 2 when ambient light is incident after the first mirror layer and the second mirror layer are removed. Fig. 4 is a schematic circuit diagram of a portion of the OLED display module shown in fig. 2 when ambient light is incident. Fig. 5 is a schematic circuit diagram of light emitted by the OLED light-emitting layer in the OLED display module shown in fig. 2.

The present embodiment provides an OLED display module 1, which includes an OLED light emitting layer 10, a quarter-wave plate 20, a first mirror layer 30, a linear polarizer 40, and a second mirror layer 50. The light emitted by the OLED light-emitting layer 10 includes a first linearly polarized light P1 and a second linearly polarized light S1. And the quarter-wave plate 20 is arranged on one side of the OLED light emitting layer 10. The first mirror layer 30 is arranged on one side, away from the OLED light-emitting layer 10, of the quarter-wave plate 20, the first mirror layer 30 has a first reflection axis, and the vibration direction of the second linearly polarized light S1 is the same as the direction of the first reflection axis. A linear polarizer 40 arranged on the side of the first mirror layer 30 facing away from the OLED light-emitting layer 10. And the second mirror layer 50 is arranged on one side of the linear polarizer 40, which is far away from the OLED light-emitting layer 10, the directions of the transmission axes of the first mirror layer 30, the linear polarizer 40 and the second mirror layer 50 are the same, and the vibration direction of the first linearly polarized light P1 is the same as the direction of the transmission axis.

The display module provided by the embodiment is an organic light-emitting diode (OLED) display module, and the OLED display module 1 has a smaller thickness, high color saturation, gorgeous color, no need of backlight, and excellent viewing angle and response speed. The purpose of improving power consumption can be better achieved by using the related structure of the OLED display module 1, in other words, the present embodiment is optimized on the basis of a mirror display scheme derived from the OLED display technology. Optionally, the OLED display module 1 is an AMOLED display module 1.

The OLED display module 1 includes the OLED light emitting layer 10, the quarter-wave plate 20, the first mirror layer 30, the linear polarizer 40, and the second mirror layer 50, but this does not mean that the OLED display module 1 includes only the above structure, and the OLED display module 1 may further include other components, such as a cover plate, an optical adhesive, a back plate, a buffer layer, and so on. This merely means that the present embodiment can solve the technical problem in the background art by the above-described means. Next, the present application will describe the above-described components one by one.

The OLED light emitting layer 10 mainly functions to emit light, and the OLED light emitting layer 10 mainly includes a cathode, an electron injecting layer, an electron transporting layer, a light emitting layer, a hole transporting layer, a hole injecting layer, an anode, and the like. The cathode includes, but is not limited to, metal, and the anode includes, but is not limited to, indium Tin Oxide (ITO). By applying a voltage to the cathode and the anode, electrons and holes can be collected in the light emitting layer to emit light, so that the OLED light emitting layer 10 has a self-light emitting function. When the OLED light-emitting layer 10 does not emit light, the display module is in a screen-off state. When the OLED light-emitting layer 10 emits light, the display module is in a bright screen state.

The quarter-wave plate 20, which may also be referred to as a 1/4 wave plate, is made of a birefringent material having different refractive indexes, i.e. different propagation velocities, for incident light with different polarization directions. The quarter-wave plate 20 controls the material and thickness to make the light pass through the wave plate, and the two lights with different polarization directions generate a phase difference of 1/4 wavelength. It can also be understood that the quarter-wave plate 20 utilizes the anisotropic characteristics of the material, and has different refractive indexes and propagation speeds for light with different polarization directions, thereby causing a phase difference between two components, converting linearly polarized light into circularly polarized light R, or converting circularly polarized light R into linearly polarized light. The plane formed by the vibration direction and the light wave advancing direction is called a vibration plane, and the light vibration plane is limited to a certain fixed direction and is called linearly polarized light. While the vibration plane rotates with time at a circular frequency w with respect to the propagation direction, the trajectory of the end of the light vector lies on a circle, called circularly polarized light R.

In this embodiment, the quarter-wave plate 20 is disposed at one side of the OLED light emitting layer 10, and light emitted from the OLED light emitting layer 10 first passes through the quarter-wave plate 20. The present embodiment is not limited to the parameters of the quarter-wave plate 20 such as material, thickness, and shape, as long as the above functions are achieved. In addition, it should be noted that the natural light or the light emitted from the OLED light emitting layer 10 does not change after passing through the quarter-wave plate 20.

The linear polarizer 40 is a component for controlling the transmission of light, and is located on the side of the quarter-wave plate 20 facing away from the OLED light-emitting layer 10, i.e. the linear polarizer 40 is located above the quarter-wave plate 20. The light emitted by the OLED light-emitting layer 10, whether natural light or light emitted by the OLED light-emitting layer 10, can be decomposed into linearly polarized light Ex with a vibration direction parallel to the normal plane X and linearly polarized light Ey with a vibration direction along the Y axis, that is, the light emitted by the OLED light-emitting layer 10 includes a first linearly polarized light P1 and a second linearly polarized light S1, and the vibration direction of the first linearly polarized light P1 is perpendicular to the vibration direction of the second linearly polarized light S1. The linearly polarized light Ex may be referred to as P light, and the linearly polarized light Ey may be referred to as S light. The present embodiment will be described below by way of example with reference to the P-ray S-ray. The linear polarizer 40 has a transmission axis and an absorption axis, wherein the transmission axis of the linear polarizer 40 is parallel to the normal plane X, and the absorption axis of the linear polarizer 40 is parallel to the Y axis, so that P light can pass through the linear polarizer 40, and S light is absorbed by the linear polarizer 40.

In the present embodiment, since the vibration direction of the first linearly polarized light P1 is the same as the direction of the transmission axis, in other words, the first linearly polarized light P1 can be regarded as P light, the second linearly polarized light S1 can be regarded as S light, that is, the first linearly polarized light P1 can pass through the linearly polarizing plate 40, and the second linearly polarized light S1 can be absorbed by the linearly polarizing plate 40.

The combination of the linear polarizer 40 and the quarter-wave plate 20 may be referred to as a circular polarizer, which has the effect of preventing reflected light from re-exiting. Specifically, the ambient light may be divided into a third linearly polarized light S2 and a fourth linearly polarized light P2, and the vibration direction of the third linearly polarized light S2 is perpendicular to the vibration direction of the fourth linearly polarized light P2. Wherein the oscillation direction of the third linearly polarized light S2 is the same as the direction of the second reflection axis of the second mirror layer 50, so the third linearly polarized light S2 can be understood as S light, and the oscillation direction of the fourth linearly polarized light P2 is the same as the direction of the transmission axis of the second mirror layer 50, so the fourth linearly polarized light P2 can be understood as P light. As shown in fig. 3, when the external environment light is emitted to the OLED display module 1, the third linearly polarized light S2 is absorbed by the linear polarizer 40, and the fourth linearly polarized light P2 can pass through the linear polarizer 40 and then pass through the quarter-wave plate 20, at this time, the linearly polarized light P generates a phase difference of 1/4 wavelength, and is converted into circularly polarized light R and has a certain rotation direction, such as left-handed circularly polarized light R or right-handed circularly polarized light R. This circularly polarized light R can then be reflected at the cathode in the OLED light-emitting layer 10, while still being circularly polarized light R but with a change of handedness, for example left-handed circularly polarized light R is converted into right-handed circularly polarized light R, which is converted into left-handed circularly polarized light R. The converted circularly polarized light R will pass through the quarter-wave plate 20 again, at this time, the circularly polarized light R will generate a phase difference of 1/4 wavelength again, and the two phase difference changes generate a phase difference of 1/2 wavelength together, so that the circularly polarized light R is converted into the S light perpendicular to the original P light, i.e. the third linearly polarized light S2. Therefore, the third linearly polarized light S2 is absorbed by the linearly polarized light plate 40 when it is incident on the linearly polarized light plate 40, and cannot pass through the linearly polarized light plate 40 again, so that the reflected light is prevented from being re-emitted.

The first mirror layer 30 and the second mirror layer 50 may also be understood as a polarizer, but the polarizer differs from the linear polarizer 40 most strongly in that it has no absorption axis, but rather a reflection axis. In other words, the first mirror layer 30 and the second mirror layer 50 do not absorb light, but reflect light. Specifically, the first mirror layer 30 and the second mirror layer 50 have a transmission axis and a reflection axis, and the directions of the transmission axes of the first mirror layer 30 and the second mirror layer 50 are the same as the direction of the transmission axis of the linearly polarizing plate 40, and are both parallel to the normal plane X, so that the P light can be transmitted. The direction of the reflection axis of the first mirror layer 30 and the second mirror layer 50 is parallel to the Y axis, so that the S light is reflected.

To sum up, the first linearly polarized light P1 and the fourth linearly polarized light P2 may pass through the first mirror layer 30, the linearly polarizing plate 40, and the second mirror layer 50. The second linearly polarized light S1 and the fourth linearly polarized light P2 are absorbed by the linearly polarized plate 40, and can be reflected on the first mirror layer 30 and the second facing layer.

It should be noted that in this embodiment, the reflection axis of the first mirror layer 30 is referred to as a first reflection axis, and the reflection axis of the second mirror layer 50 is referred to as a second reflection axis. The fact that the first axis of reflection coincides with the second axis of reflection is only given a different nomenclature for the convenience of the area to which mirror layer each axis of reflection belongs.

The above-mentioned technical problem is solved by the mutual cooperation of the above-mentioned components. First, as shown in fig. 4, in the present embodiment, the second mirror layer 50 is disposed on the side of the linear polarizer 40 away from the OLED light-emitting layer 10, that is, the second mirror layer 50 is disposed above the linear polarizer 40. In the off-screen mode, i.e. when the OLED light-emitting layer 10 does not emit light, ambient light first passes through the second mirror layer 50. When the ambient light is emitted to the OLED display module 1, the fourth linearly polarized light P2 may pass through the second mirror layer 50, and the third linearly polarized light S2 may be reflected on the second mirror layer 50, so as to finally achieve the mirror effect. In summary, the second mirror layer 50 is added and disposed above the linear polarizer 40 in the present embodiment, so that the function of a mirror can be achieved when the OLED display module 1 is turned off. As for the fourth linearly polarized light P2, it can be finally emitted through the cooperation of the respective components, and the specific principle and process will be described later in this application.

Next, in this embodiment, the first mirror layer 30 may be disposed between the linear polarizer 40 and the quarter-wave plate 20, so that the OLED display module 1 sequentially includes, from bottom to top, the OLED light emitting layer 10, the quarter-wave plate 20, the first mirror layer 30, the linear polarizer 40, and the second mirror layer 50. Wherein the direction of the first reflection axis of the first mirror layer 30 is parallel to the Y-axis as the direction of the second reflection axis of the second mirror layer 50, the S light is reflected and thus the second linearly polarized light S1 is reflected. The direction of the transmission axis of the first mirror layer 30 is the same as the direction of the transmission axis of the second mirror layer 50 and the linearly polarizing plate 40, and the light P can be transmitted parallel to the normal plane X, so that the first linearly polarized light P1 can pass through the first mirror layer 30.

As shown in fig. 5, when the old light-emitting layer emits light, the natural light beam still remains as a natural light beam after passing through the quarter-wave plate 20 for the first time, and at this time, since the vibration direction of the first linearly polarized light P1 (P light) is the same as the direction of the transmission axis of the first mirror layer 30, the linearly polarized light plate 40, and the second mirror layer 50, the first linearly polarized light P1 can pass through the first mirror layer 30, the linearly polarized light plate 40, and the second mirror layer 50 in sequence and be emitted, and a first part of the emitted light is formed. Since the vibration direction of the second linearly polarized light S1 (S light) is parallel to the direction of the first reflection axis of the first mirror layer 30, the second linearly polarized light S1 will be reflected on the first mirror surface, and then the second linearly polarized light S1 will pass through the quarter-wave plate 20 for the second time, at this time, the second linearly polarized light S1 will generate a phase difference of 1/4 wavelength, so as to be converted into the circularly polarized light R and have the first rotation direction (for example, left rotation or right rotation). Subsequently circularly polarized light R with a first handedness can be reflected at the cathode in the OLED light-emitting layer 10, where the circularly polarized light R is still circularly polarized light R but has a second handedness, the first handedness being opposite to the second handedness. Then, the circularly polarized light R with the second handedness passes through the quarter-wave plate 20 for the third time, and then the circularly polarized light R with the second handedness generates a phase difference of 1/4 wavelength again, and the two changes of the phase difference generate a phase difference of 1/2 wavelength, so that the circularly polarized light R with the second handedness is converted into the first linearly polarized light P1. Therefore, the converted first linearly polarized light P1 can pass through the first mirror layer 30, the linearly polarizing plate 40, and the second mirror layer 50 in this order and be emitted as the second part of the emitted light. The sum of the first portion of light and the second portion of light is the final outgoing light of the present embodiment.

In summary, compared to the related art where the OLED light emitting layer 10 emits light, the first linearly polarized light P1 can be emitted normally, but the second linearly polarized light S1 is absorbed by the linear polarizer 40. In this embodiment, the OLED display module 1 has a mirror display function by adding the second mirror layer 50 to the linear polarizer 40. In addition, in the present embodiment, the first mirror layer 30 is additionally disposed between the linear polarizer 40 and the quarter-wave plate 20, so that the S light that is originally absorbed by the linear polarizer 40 is reflected again, and is reflected by the quarter-wave plate 20 and the OLED light-emitting layer 10 in sequence, and then passes through the quarter-wave plate 20 again, so that the S light is converted into P light that can pass through, and is emitted to the environment. In other words, in the present embodiment, the polarized light originally absorbed by the linearly polarizing plate 40 is recycled and emitted, so that the brightness of the emitted light is greatly improved, and the extraction efficiency of the OLED display module 1 is improved. Therefore, on the premise of the same brightness, the power consumption of the OLED display module 1 can be reduced and the endurance can be improved.

In this embodiment, the intensity of the first linearly polarized light P1 converted from the second linearly polarized light S1 when the first linearly polarized light P1 passes through the first mirror layer 30, the linearly polarizing plate 40, and the second mirror layer 50 in this order is 30% to 40% of the intensity of the light emitted from the OLED light-emitting layer 10.

As can be seen from the above, in the present invention, the second linearly polarized light S1 that should be absorbed by the linearly polarized plate 40 is converted into the first linearly polarized light P1 to be reused and emitted, and therefore, the intensity of the emitted light is increased to the intensity of the first linearly polarized light P1 emitted after conversion. Optionally, the intensity of the second linearly polarized light S1 is half of the intensity of the light emitted by the OLDE light-emitting layer, that is, half of the light emitted by the OLDE light-emitting layer is the first linearly polarized light P1, and the other half is the second linearly polarized light S1. After the second linearly polarized light S1 undergoes multiple reflection losses, 80% -90% of light is converted into the first linearly polarized light P1, namely the intensity of the converted first linearly polarized light P1 accounts for 40% -45% of the light intensity when the OLDE light-emitting layer emits light. The intensity of the converted first linearly polarized light P1 emitted through the first mirror layer 30, the linearly polarizing plate 40, the second mirror layer 50, and the like is 30% to 40% of the intensity of light emitted from the OLDE light-emitting layer. In other words, the light extraction efficiency of the OLED display module 1 can be improved by 30% to 40%, and the power consumption of the OLED display module 1 can be reduced by 30% to 40%.

Referring to fig. 6, fig. 6 is a schematic partial circuit diagram of an OLED display module according to another embodiment of the present application when ambient light is incident thereon. In this embodiment, the second mirror layer 50 has a second reflection axis, the ambient light includes a third linearly polarized light S2 and a fourth linearly polarized light P2, the vibration direction of the third linearly polarized light S2 is the same as the direction of the first reflection axis and the direction of the second reflection axis, and the vibration direction of the fourth linearly polarized light P2 is the same as the direction of the transmission axis.

When the ambient light reaches the second mirror layer 50, the third linearly polarized light S2 can be reflected, and the fourth linearly polarized light P2 can sequentially pass through the second mirror layer 50, the linear polarizer 40, the first mirror layer 30, and the quarter-wave plate 20, and is reflected on the OLED light emitting layer 10 and passes through the quarter-wave plate 20 for the second time, so that the fourth linearly polarized light P2 is converted into the third linearly polarized light S2.

The converted third linearly polarized light S2 is reflected again by the first mirror layer 30 and passes through the quarter wave plate 20 for the third time, and then is reflected again by the OLED light emitting layer 10 and passes through the quarter wave plate 20 for the fourth time, so that the converted third linearly polarized light S2 is converted into the fourth linearly polarized light P2, and further passes through the first mirror layer 30, the linear polarizer 40, and the second mirror layer 50 in sequence and is emitted.

Having described the principle of specular reflection of the second mirror layer 50 in detail above, the third linearly polarized light S2 is reflected at the second mirror layer 50 to achieve the mirror effect. The second mirror layer 50, the third linearly polarized light S2 and the fourth linearly polarized light P2 have been described in detail above, and the description of the embodiment is omitted again. The present embodiment will describe the action of the fourth linearly polarized light P2 in detail. The direction of vibration of the fourth linearly polarized light P2 is the same as the direction of the transmission axes of the second mirror layer 50, the linearly polarizing plate 40, and the first mirror layer 30, and therefore the fourth linearly polarized light P2 can pass through the second mirror layer 50, the linearly polarizing plate 40, the first mirror layer 30, and the quarter-wave plate 20 in this order. Now the fourth linearly polarized light P2 is converted into circularly polarized light R and has a first sense of rotation (e.g. left or right), which may be reflected at the cathode in the OLED light emitting layer 10, where the circularly polarized light R is still circularly polarized light R but has a second sense of rotation, which is opposite to the first sense of rotation. The circularly polarized light R with the second handedness will then pass through the quarter-wave plate 20 a second time, at which time the circularly polarized light R with the second handedness will again generate a phase difference of 1/4 wavelength, and the two phase difference changes will generate a phase difference of 1/2 wavelength together, so that the circularly polarized light R with the second handedness is converted into the third linearly polarized light S2. Since the third linearly polarized light S2 vibrates in the same direction as the first and second reflection axes, the converted third linearly polarized light S2 will be reflected by the first mirror layer 30 and pass through the quarter-wave plate 20 for the third time. The third linearly polarized light S2 converted at this time will be converted into circularly polarized light R again and has a first handedness (for example, left-handed or right-handed), and the circularly polarized light R with the first handedness may be reflected on the cathode in the OLED light emitting layer 10, and at this time, the circularly polarized light R is still circularly polarized light R but has a second handedness, and the first handedness is opposite to the second handedness. The circularly polarized light R with the second handedness will then pass through the quarter-wave plate 20 for a fourth time, at which time the circularly polarized light R with the second handedness will again generate a phase difference of 1/4 wavelength, and the two changes of the phase difference will generate a phase difference of 1/2 wavelength altogether, so that the circularly polarized light R with the second handedness is converted into fourth linearly polarized light P2. Therefore, the fourth linearly polarized light P2 can finally pass through the first mirror layer 30, the linearly polarizing plate 40, and the second mirror layer 50 and be emitted, and the reflected third linearly polarized light S2 and the converted emitted fourth linearly polarized light P2 together constitute the emitted light during the specular reflection.

In summary, the first mirror layer 30 and the second mirror layer 50 can also improve the intensity of light emitted during specular reflection, and further improve the display effect of specular reflection.

Referring to fig. 7 to 8 together, fig. 7 is a schematic partial cross-sectional view of an OLED display module according to an embodiment of the present disclosure. FIG. 8 is a schematic cross-sectional view of a portion of an OLED display module according to another embodiment of the present application. In this embodiment, at least one of the first mirror layer 30 and the second mirror layer 50 includes a first refractive index layer 31 and a second refractive index layer 32 alternately stacked in sequence along the arrangement direction of the OLED light emitting layer 10 to the quarter-wave plate 20, and both the side close to the OLED light emitting layer 10 and the side away from the OLED light emitting layer 10 are the first refractive index layer 31 or the second refractive index layer 32. Wherein the refractive index of the first refractive index layer 31 is greater than the refractive index of the second refractive index layer 32.

The first mirror layer 30 and the second mirror layer 50 may be formed by alternately stacking two layers having different refractive indexes. In this embodiment, the first refractive index layer 31 is a high refractive index film layer, and the second refractive index layer 32 is a low refractive index film layer. As known from the fresnel formula when light is refracted and reflected, the light reflects and refracts to change its polarization state, and if the incident light is natural light, the reflected light and the refracted light are generally partially polarized light. Therefore, when a plurality of layers of high/low refractive index staggered and stacked thin film structures are arranged, natural light can be refracted and reflected when passing through each layer, and the natural light can gradually become a linearly polarized light state after passing through the layers for many times. The mirror layer can change the transmitted light and the reflected light of the natural light to the linearly polarized light states (transmitted light Ex, reflected light Ey), respectively.

In this embodiment, the first refractive index layer 31 or the second refractive index layer 32 can be both on the side close to the OLED light emitting layer 10 and on the side away from the OLED light emitting layer 10, in other words, the same layers can be both the first refractive index layer 31 or the second refractive index layer 32 on the opposite sides of the mirror layer, i.e., the layers on the opposite sides of the mirror layer are both high refractive index layers or both low refractive index layers. Therefore, the angle of the light penetrating through the mirror layer is parallel to the angle of the light penetrating through the incident mirror layer, the change of the angle of the light penetrating through the mirror layer is avoided, and the stability of the light path is kept.

It should be noted that in this embodiment, only the first mirror layer 30 may have the above-mentioned structure, and the second mirror layer 50 may have other structures. Or only the second mirror layer 50 may have the above-mentioned structure and the first mirror layer 30 may have other structures. Alternatively, the first mirror layer 30 and the second mirror layer 50 are both of the above-mentioned structure. This embodiment and the following description are only schematically illustrated by the schematic view of the first mirror layer 30.

Alternatively, the first mirror layer 30 and the second mirror layer 50 can be prepared by micro-extrusion.

This application describes two specific embodiments of the mirror layer in detail. Referring to fig. 7 again, in the present embodiment, at least one of the first mirror layer 30 and the second mirror layer 50 includes the first refractive index layer 31 and a plurality of refractive groups 33, and the first refractive index layer 31 is far away from the OLED light emitting layer 10 than the plurality of refractive groups 33. Each of the refraction groups 33 includes the first refractive index layer 31 and the second refractive index layer 32, and the first refractive index layer 31 of each of the refraction groups 33 is closer to the OLED light emitting layer 10 than the second refractive index layer 32.

In the first embodiment, the structure of the mirror layer from the side close to the OLED light emitting layer 10 to the side far from the OLED light emitting layer 10 may be a first refractive index layer 31, a second refractive index layer 32, and a first refractive index layer 31. In other words, the mirror layer is a high refractive index layer on opposite sides of the mirror layer. Optionally, one first refractive index layer 31 and one second refractive index layer 32 are one refractive group 33. The mirror layer has 100-500 refractive groups 33.

Referring to fig. 8 again, in the present embodiment, at least one of the first mirror layer 30 and the second mirror layer 50 includes the second refractive index layer 32 and a plurality of refractive elements 33, and the second refractive index layer 32 is far away from the OLED light emitting layer 10 than the plurality of refractive elements 33. Each of the refraction groups 33 includes the first refractive index layer 31 and the second refractive index layer 32, and the first refractive index layer 31 in each of the refraction groups 33 is far away from the OLED light emitting layer 10 than the second refractive index layer 32.

In the second embodiment, the structure of the mirror layer from the side close to the OLED light emitting layer 10 to the side far from the OLED light emitting layer 10 may be a second refractive index layer 32, a first refractive index layer 31, a second refractive index layer 32, a first refractive index layer 31 · a second refractive index layer 32. In other words, the layers on opposite sides of the mirror layer are low refractive index layers. Optionally, one first refractive index layer 31 and one second refractive index layer 32 are one refractive group 33. The mirror layer has 100-500 refractive groups 33.

In this embodiment, at least one of the first mirror layer 30 and the second mirror layer 50 is a flexible mirror layer. This embodiment can make the mirror layer by flexible material preparation, can cooperate OLED display module 1's other structures to prepare into flexible bendable OLED display module 1 like this, makes OLED display module 1 use in flexible electronic equipment 2.

It is noted that in this embodiment, only the first mirror layer 30 can be a flexible mirror layer, and the second mirror layer 50 can be another mirror layer. Alternatively, only the second mirror layer 50 is the flexible mirror layer and the first mirror layer 30 is the other mirror layer. Alternatively, the first mirror layer 30 and the second mirror layer 50 are both flexible mirror layers.

Alternatively, the materials of the first mirror layer 30 and the second mirror layer 50 include, but are not limited to, polyethylene terephthalate (PET).

Referring to fig. 9-10, fig. 9 is a schematic cross-sectional view of an OLED display module according to another embodiment of the present disclosure. FIG. 10 is a schematic cross-sectional view of an OLED display module according to still another embodiment of the present application. In this embodiment, the OLED display module 1 further includes a light-transmitting cover plate 60, the second mirror layer 50 is disposed between the light-transmitting cover plate 60 and the linear polarizer 40, or the second mirror layer 50 is disposed on a side of the light-transmitting cover plate 60 away from the linear polarizer 40.

The OLED display module 1 may further include a light-transmitting cover plate 60 besides the above components, and the light-transmitting cover plate 60 is mainly used for protecting the components of the OLED display module 1 and does not affect the incident of ambient light and the emission of internal light. Optionally, the light transmissive cover sheet 60 includes, but is not limited to, rigid glass, flexible glass, and the like. As shown in fig. 9, in this embodiment, the second mirror layer 50 can be located between the transparent cover 60 and the linear polarizer 40, in other words, the second mirror layer 50 is located below the transparent cover 60, so that the transparent cover 60 can protect the second mirror layer 50. Alternatively, as shown in fig. 10, the second mirror layer 50 can be located above the transparent cover 60, so as to avoid the light loss caused by the transparent cover 60, and further improve the intensity of the emergent light when the light is reflected.

Referring to fig. 11, fig. 11 is a schematic cross-sectional view of an OLED display module according to another embodiment of the present application. In this embodiment, when the second mirror layer 50 is disposed on a side of the light-transmitting cover plate 60 departing from the linear polarizer 40, the OLED display module 1 further includes a light-transmitting protective layer 70, and the light-transmitting protective layer 70 is disposed on a side of the second mirror layer 50 departing from the light-transmitting cover plate 60.

When the second mirror layer 50 is disposed above the transparent cover plate 60, the transparent protective layer 70 can be further added in this embodiment, such that the transparent protective layer 70 is disposed above the second mirror layer 50, thereby effectively protecting the second mirror layer 50. Optionally, the thickness of the light-transmissive protective layer 70 is less than the thickness of the light-transmissive cover sheet 60.

Referring to fig. 12, fig. 12 is a schematic cross-sectional view of an OLED display module according to another embodiment of the present disclosure. In this embodiment, the OLED display module 1 further includes a touch layer 80, and the touch layer 80 is disposed between the quarter-wave plate 20 and the OLED light emitting layer 10.

The OLED display module 1 may further include a touch layer 80 in addition to the above components, so that the OLED display module 1 has a touch function in addition to the display function. The touch layer 80 can be disposed between the quarter-wave plate 20 and the OLED light-emitting layer 10 in this embodiment, even though the touch layer 80 is disposed inside the OLED display module 1. Therefore, the touch module can be prevented from being additionally prepared and assembled with the OLED display module 1, the structure is simplified, and the thickness is reduced. And the touch layer 80 is arranged inside the OLED display module 1, so that the difficulty in manufacturing the OLED display module 1 can be reduced.

The embodiment may further include an Optical Clear Adhesive (OCA) layer, and the two adjacent optical adhesive layers may be bonded together. For example, an optical adhesive layer may be bonded between the light-transmissive cover 60 and the second mirror layer 50, or between the second mirror layer 50 and the linear polarizer 40.

Please refer to fig. 13-14 together, and fig. 13 is a schematic perspective view of an electronic device according to an embodiment of the present application. Fig. 14 is a partial cross-sectional view of the electronic device shown in fig. 13 taken along direction B-B. The embodiment provides an electronic device 2, which comprises a housing 3, a processor 4 and an OLED display module 1 provided in the above embodiment of the present application, wherein the OLED display module 1 is installed on the housing 3 and forms an accommodating space 90 with the housing 3 in an enclosing manner, the processor 4 is arranged in the accommodating space 90, and the processor 4 is electrically connected with the OLED display module 1.

The electronic device 2 provided in the present embodiment includes, but is not limited to, a mobile terminal such as a mobile phone, a mirror, a glass, a tablet Computer, a notebook Computer, a palm top Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and a fixed terminal such as a Digital TV, a desktop Computer, and the like. In the present embodiment, the type of the electronic device 2 is not limited. The present embodiment is schematically described with the electronic device 2 as a mobile phone.

The electronic device 2 provided by the embodiment of the present application, through adopting the OLED display module 1 provided by the above embodiment of the present application, can improve the light extraction efficiency, reduce the power consumption, improve the cruising ability of the electronic device 2, and improve the competitiveness of the electronic device 2.

The foregoing detailed description has provided for the embodiments of the present application, and the principles and embodiments of the present application have been presented herein for purposes of illustration and description only and to facilitate understanding of the methods and their core concepts; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. An OLED display module, comprising:

the quarter-wave plate is arranged on one side of the OLED light-emitting layer;

2. The OLED display module of claim 1, wherein the intensity of the first linearly polarized light converted from the second linearly polarized light after passing through the first mirror layer, the linearly polarizing plate and the second mirror layer in sequence is 30-40% of the intensity of the light emitted from the OLED light-emitting layer.

3. The OLED display module of claim 1, wherein the second mirror layer has a second reflection axis, the ambient light includes a third linearly polarized light and a fourth linearly polarized light, the third linearly polarized light vibrates in the same direction as the first reflection axis and the second reflection axis, and the fourth linearly polarized light vibrates in the same direction as the transmission axis;

when the ambient light reaches the second mirror layer, the third linearly polarized light can be reflected, and the fourth linearly polarized light can sequentially pass through the second mirror layer, the linear polarizer, the first mirror layer and the quarter-wave plate, and is reflected on the OLED light emitting layer and passes through the quarter-wave plate for the second time, so that the fourth linearly polarized light is converted into the third linearly polarized light;

the third linearly polarized light after conversion is reflected again on the first mirror layer and passes through the quarter wave plate for the third time, then is reflected again on the OLED light emitting layer and passes through the quarter wave plate for the fourth time, so that the third linearly polarized light after conversion is converted into the fourth linearly polarized light, and then sequentially passes through the first mirror layer, the linear polarizer and the second mirror layer and is emitted.

4. The OLED display module of claim 1, wherein at least one of the first mirror layer and the second mirror layer comprises a first refractive index layer and a second refractive index layer alternately stacked in sequence along the arrangement direction of the OLED light emitting layer to the quarter-wave plate, and both the first refractive index layer and the second refractive index layer are on a side close to the OLED light emitting layer and a side away from the OLED light emitting layer; wherein a refractive index of the first refractive index layer is greater than a refractive index of the second refractive index layer.

5. The OLED display module of claim 4, wherein at least one of the first mirror layer and the second mirror layer comprises the first refractive index layer and a plurality of refractive packets, the first refractive index layer being farther from the OLED light emitting layer than the plurality of refractive packets; each refraction group comprises the first refraction index layer and the second refraction index layer, and the first refraction index layer in each refraction group is close to the OLED light emitting layer compared with the second refraction index layer.

6. The OLED display module of claim 4, wherein at least one of the first mirror layer and the second mirror layer comprises the second index layer, and a plurality of refractive packs, the second index layer being farther from the OLED light emitting layer than the plurality of refractive packs; each refraction group comprises the first refraction index layer and the second refraction index layer, and the first refraction index layer in each refraction group is far away from the OLED light emitting layer compared with the second refraction index layer.

7. The OLED display module of claim 1, wherein at least one of the first mirror layer and the second mirror layer is a flexible mirror layer.

8. The OLED display module of claim 1, further comprising a light-transmissive cover plate, wherein the second mirror layer is disposed between the light-transmissive cover plate and the linear polarizer, or wherein the second mirror layer is disposed on a side of the light-transmissive cover plate facing away from the linear polarizer.

9. The OLED display module of claim 8, wherein when the second mirror layer is disposed on a side of the light transmissive cover plate facing away from the linear polarizer, the OLED display module further comprises a light transmissive protective layer disposed on a side of the second mirror layer facing away from the light transmissive cover plate.

10. The OLED display module of claim 1, further comprising a touch layer disposed between the quarter-wave plate and the OLED light emitting layer.

11. An electronic device, comprising a housing, a processor, and the OLED display module of any one of claims 1-10, wherein the OLED display module is mounted in the housing and encloses with the housing to form an accommodating space, the processor is disposed in the accommodating space, and the processor is electrically connected to the OLED display module.