CN110289371A - A light emitting structure, display panel and display device - Google Patents

Abstract

A light-emitting structure, a display panel, and a display device provided by an embodiment of the present invention, the light-emitting structure includes: an adjustable photonic crystal structure, the adjustable photonic crystal structure has a first surface and a second surface oppositely arranged; a first support structure, The first support structure is located on the first surface, and the first support structure has a first support inclined plane forming a first preset angle with the first surface, and a light-emitting surface parallel to the first surface away from the side of the adjustable photonic crystal structure; white For the electroluminescent device, the white electroluminescent device is located on the first supporting slope, and the light-emitting surface of the white electroluminescent device faces the first supporting slope. The present invention utilizes the packaged white electroluminescent device as a backlight source, and does not need to set a polarizing structure, which simplifies the preparation process. Meanwhile, the adjustable photonic crystal structure in the present invention selectively reflects the light emitted by the white electroluminescent device. , using reflected light for display, improving the utilization rate of light.

Description

A light emitting structure, display panel and display device

technical field

The invention relates to the field of display technology, in particular to a light emitting structure, a display panel and a display device.

Background technique

The discovery of photonic crystals has provided a great boost to the development of optics and display fields. Among them, adjustable photonic crystals are one of the major works. The production of solid photonic crystals or hydrocolloid photonic crystals filled with small molecular liquid crystals (using solvent content, etc.) Regulating the photon band gap), the adjustment of the photon band gap can be realized, and then the selective output of continuous spectrum can be realized.

In related display technologies, adjustable photonic crystals are used to filter light in liquid crystal display panels. Specifically, the backlight module emits white light, which passes through the liquid crystal layer and the adjustable photonic crystal layer respectively, and emits light corresponding to gray scales and corresponding colors. For display, wherein the adjustable photonic crystal layer functions as a color filter layer, a polarizing layer is still required to polarize light, and the transmittance loss is relatively large.

Contents of the invention

In view of this, the embodiments of the present invention provide a light emitting structure, a display panel and a display device to solve the problem of low light utilization efficiency of the display panel in the related art.

In a first aspect, an embodiment of the present invention provides a light emitting structure, including:

an adjustable photonic crystal structure, the adjustable photonic crystal structure having a first surface and a second surface disposed opposite to each other;

A first support structure, the first support structure is located on the first surface, the first support structure has a first support slope forming a first preset angle with the first surface, and is far away from the adjustable photon a light-emitting surface on one side of the crystal structure and parallel to the first surface;

A white electroluminescent device, the white electroluminescent device is located on the first support slope, and the light-emitting surface of the white electroluminescence device faces the first support slope;

The controllable photonic crystal structure is configured to reflect a preset wavelength band of light emitted by the white electroluminescent device to the light-emitting surface.

In a possible implementation manner, the light-emitting structure provided in the embodiment of the present invention further includes: a base substrate and a second support structure, and the second support structure is located between the base substrate and the controllable photon between crystal structures;

The side of the second support structure away from the base substrate has a second support slope, the second support slope forms a second preset angle with the base substrate, and the second support slope and the first support The two surfaces are in contact.

In a possible implementation manner, in the light-emitting structure provided in the embodiment of the present invention, the inclination directions of the first support slope and the second support slope are consistent, and the second preset angle is equal to the first support slope. a preset angle.

In a possible implementation manner, in the light emitting structure provided by the embodiment of the present invention, the adjustable photonic crystal structure includes: a first electrode, an adjustable photonic crystal layer and a second electrode located on the substrate in sequence electrode;

The tunable photonic crystal layer is configured to reflect light of a predetermined wavelength band under the driving of the first electrode and the second electrode.

In a possible implementation manner, the light-emitting structure provided in the embodiment of the present invention further includes: a third electrode located on the side of the light-emitting surface of the first support structure, and a third electrode located on the first surface a fourth electrode, and the third electrode and the fourth electrode are transparent electrodes;

The third electrode is electrically connected to the anode of the white electroluminescent device, and the fourth electrode is electrically connected to the cathode of the white electroluminescent device.

In the second aspect, the embodiment of the present invention also provides a display panel, including a plurality of closely arranged light emitting structures as described in any embodiment of the first aspect, and the controllable photonic crystal structure in all the light emitting structures set in one piece.

In a possible implementation manner, in the display panel provided by the embodiment of the present invention, all the adjustable photonic crystal structures are located on the second support slope of the same second support structure.

In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the second electrode and the fourth electrode are the same electrode and are arranged on the entire surface.

In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the tunable photonic crystal layer includes: a red tunable photonic crystal, a green tunable photonic crystal, and a blue tunable photonic crystal;

Wherein, the red tunable photonic crystal is configured to reflect the red band portion of the light emitted by the white electroluminescent device, and the green tunable photonic crystal is configured to reflect a portion of the light emitted by the white electroluminescent device. For the green band part, the blue tunable photonic crystal is configured to reflect the blue band part of the light emitted by the white electroluminescent device.

In a possible implementation manner, the display panel provided in the embodiment of the present invention further includes: The encapsulation protective layer of the light emitting device.

In a third aspect, an embodiment of the present invention further provides a display device, including the display panel described in any embodiment of the second aspect.

Beneficial effects of the present invention:

Embodiments of the present invention provide a light-emitting structure, a display panel, and a display device. The light-emitting structure includes: an adjustable photonic crystal structure, and the adjustable photonic crystal structure has a first surface and a second surface oppositely arranged; a first support structure, the first support structure is located on the first surface, the first support structure has a first support slope forming a first preset angle with the first surface, and is away from the controllable photonic crystal structure by one A light-emitting surface on the side and parallel to the first surface; a white electroluminescent device, the white electroluminescent device is located on the first support slope, and the light-emitting surface of the white electroluminescent device faces the first A supporting slope; the adjustable photonic crystal structure is configured to reflect a predetermined wavelength band of light emitted by the white electroluminescent device to the light-emitting surface. The present invention utilizes the packaged white electroluminescent device as a backlight source, and does not need to set a polarizing structure, which simplifies the preparation process. Meanwhile, the adjustable photonic crystal structure in the present invention is to selectively reflect the light emitted by the white electroluminescent device. , using reflected light for display, which improves the utilization rate of light.

Description of drawings

FIG. 1 is one of the structural schematic diagrams of the light emitting structure provided by the embodiment of the present invention;

Fig. 2 is the second structural schematic diagram of the light emitting structure provided by the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a light emitting structure provided by an embodiment of the present invention;

FIG. 4 is one of the structural schematic diagrams of the display panel provided by the embodiment of the present invention;

FIG. 5 is a second structural schematic diagram of a display panel provided by an embodiment of the present invention.

Detailed ways

To solve the problem of low light utilization efficiency in the display panel in the related art, the embodiment of the present invention provides a light emitting structure, a display panel and a display device. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The shapes and sizes of the components in the drawings do not reflect the true scale, and the purpose is only to illustrate the content of the present invention.

An embodiment of the present invention provides a light emitting structure, as shown in Figure 1 and Figure 3, including:

An adjustable photonic crystal structure 1, the adjustable photonic crystal structure 1 has a first surface a1 and a second surface a2 oppositely arranged;

The first support structure 2, the first support structure 2 is located on the first surface a1, the first support structure 2 has a first support slope b1 forming a first preset angle r with the first surface a1, and is far away from the adjustable photonic crystal structure 1 a light-emitting surface b2 on one side and parallel to the first surface a1;

A white electroluminescent device 3, the white electroluminescent device 3 is located on the first support slope b1, and the light-emitting surface of the white electroluminescent device 3 faces the first support slope b1;

The controllable photonic crystal structure 1 is configured to reflect a predetermined wavelength band of light emitted by the white electroluminescent device 3 to the light-emitting surface b2.

Specifically, in the light-emitting structure provided by the embodiment of the present invention, the packaged white electroluminescent device is used as the backlight source, and no polarizing structure is required, which simplifies the manufacturing process. Setting, the white electroluminescent device is arranged on the first support slope, the light emitted by the white electroluminescent device is irradiated on the adjustable photonic crystal structure, and the adjustable photonic crystal structure converts the light emitted by the white electroluminescent device Selective reflection, that is, only reflect the light in the preset wavelength band, and use the reflected light for display, without going through other film layers, which improves the utilization rate of light.

It should be noted that since the light reflected by the adjustable photonic crystal structure is not necessarily emitted perpendicular to the light exiting surface of the first supporting structure, the light exiting surface of the first supporting structure refers to a distance away from the adjustable photonic crystal structure. side, and a surface parallel to the first surface of the tunable photonic crystal structure.

Among them, photonic crystal (Photonic Crystal) is an artificial microstructure formed by periodic arrangement of media with different refractive indices. Photonic crystals are photonic bandgap materials. From the perspective of material structure, photonic crystals are a type of artificially designed and manufactured crystals with periodic dielectric structures on the optical scale. Similar to the modulation of electronic wave functions by semiconductor lattices, photonic bandgap materials can modulate electromagnetic waves with corresponding wavelengths. When electromagnetic waves propagate in photonic bandgap materials, they are modulated due to Bragg scattering, and the energy of electromagnetic waves forms a band structure. . There is a band gap between the energy band and the energy band, that is, the photonic band gap. Photons with energies within the photonic bandgap cannot enter the crystal and will be reflected. By adjusting the photonic band gap in different ways, different wavelengths of light can be reflected. Specifically, the control of the forbidden band of the photonic crystal can be controlled by electricity, or driven by heat, light, etc. Here, the matching is adjusted according to the match between the controllable photonic crystal and the liquid crystal, and the control method is not specifically limited here.

It should be noted that the first support structure is a transparent support structure, which can pass the light reflected by the adjustable photonic crystal structure. Specifically, materials such as low-refractive index resin can be used to reduce the change of the optical path. Of course, other transparent materials can also be used. This is not specifically limited.

Optionally, in the light emitting structure provided by the embodiment of the present invention, as shown in FIG. 2 and FIG. Regulating between photonic crystal structures 1;

The side of the second support structure 7 facing away from the base substrate 6 has a second support slope c1, the second support slope c1 forms a second preset angle i with the base substrate 6, and the second support slope c1 is in contact with the second surface a2 .

Specifically, in the light-emitting structure provided by the embodiment of the present invention, as shown in FIG. 2 and FIG. The e1 surface of the base substrate forms a second preset angle i, and the second support slope c1 and the first support slope b1 form a first preset angle r, and the design of the first preset angle r and the second preset angle i can Controlling the outgoing angle of the reflected light, as shown in FIG. 3 , can make the outgoing light exit perpendicular to the d1 surface of the encapsulation protective layer.

Optionally, in the light-emitting structure provided by the embodiment of the present invention, as shown in FIG. 3 , the inclination directions of the first support slope b1 and the second support slope c1 are consistent, and the second preset angle i is equal to the first preset angle r.

Specifically, in the light-emitting structure provided by the embodiment of the present invention, as shown in FIG. 3 , when the first preset angle r is equal to the second preset angle i, the angle between the reflected light and the d1 surface of the encapsulation protective layer is 90°. ° (or 90° to the base substrate), that is, the maximum light effect is obtained at the front viewing angle, and the viewing effect is the best.

Wherein, the larger the second preset angle is, the proportion of the white electroluminescent device in the pixel display will gradually decrease, and the light output ratio will gradually increase. When the white electroluminescent device is 90° to the light emitting surface, the white electroluminescent device will The smallest proportion in the pixel display can get the largest light output rate. However, with the increase of the second preset angle, the thickness of the product will gradually increase, and the increase of product thickness will have an impact on the light extraction rate and the difficulty of the process. Therefore, the influence of the above factors must be comprehensively considered in the actual use process. , to design the product.

Optionally, in the light-emitting structure provided by the embodiment of the present invention, as shown in FIG. 2 , the adjustable photonic crystal structure 1 includes: a first electrode 11 located on the base substrate 6 in sequence, an adjustable photonic crystal layer 12 and a second electrode. Two electrodes 13;

The controllable photonic crystal layer 12 is configured to reflect light of a predetermined wavelength band under the driving of the first electrode 11 and the second electrode 13 .

Specifically, in the light-emitting structure provided by the embodiment of the present invention, when the adjustable photonic crystal layer can adjust the forbidden band of the photonic crystal through voltage, the first electrode and the second electrode can be respectively arranged on both sides of the adjustable photonic crystal layer , by applying different voltages to the first electrode and the second electrode to adjust the light of different chromaticity, for example, when the light emitting structure is used for display, it can be adjusted by applying different voltages to the first electrode and the second electrode The red light, green light and blue light used for display, of course, can also be adjusted to produce other color light, which is not specifically limited here.

Optionally, in the light-emitting structure provided by the embodiment of the present invention, as shown in FIG. 2 , it further includes: a third electrode 4 located on the side of the light-emitting surface b2 of the first support structure 2, and a third electrode 4 located on the first surface a1. Four electrodes 13 (can be reused with the second electrode 13), and the third electrode 4 and the fourth electrode 13 are transparent electrodes;

The third electrode 4 is electrically connected to the anode of the white electroluminescent device 3 , and the fourth electrode 13 is electrically connected to the cathode of the white electroluminescent device 3 .

Specifically, in the light-emitting structure provided by the embodiment of the present invention, the third electrode and the fourth electrode are used to drive the white electroluminescent device, and the white electroluminescent device is driven by applying different voltages to the third electrode and the fourth electrode to display Light of different brightness.

Based on the same inventive concept, an embodiment of the present invention also provides a display panel, as shown in Figure 4, which includes a plurality of closely arranged light-emitting structures as provided in any of the above-mentioned embodiments, and the controllable photonic crystal structure in all light-emitting structures 1 is set in one piece.

Among them, the adjustable photonic crystal structure in all light-emitting structures is integrated, which refers to the integrated structure of the adjustable photonic crystal layer in the adjustable photonic crystal structure. In order to realize the display of different colors, different voltages need to be applied, at least the first The electrode or the second electrode is different in an integrated structure. This setting can simplify the preparation process, and can form an array of adjustable photonic crystal structures. By controlling the band gaps of each adjustable photonic crystal structure, different colors of light can be emitted. , that is, each sub-pixel is formed for display.

Optionally, in the display panel provided by the embodiment of the present invention, as shown in FIG. 5 , all controllable photonic crystal structures 1 are located on the second support slope of the same second support structure 7 .

Specifically, in the display panel provided by the embodiment of the present invention, if all the adjustable photonic crystal structures are arranged on the same second support slope, then the second preset angle between all the adjustable photonic crystal structures and the substrate is Similarly, as long as the first preset angles of each region of the display panel are designed, display effects of different viewing angles can be obtained to meet the display requirements of different scenes.

If the positive viewing angle is the best application in some scenes, then the first preset angle and the second preset angle should be designed so that the reflected light can be emitted perpendicular to the light-emitting surface. Of course, in some scenes, the upward or downward viewing angle is For the best viewing angle, the first preset angle and the second preset angle can also be designed to meet the needs and improve the display effect.

Optionally, in the display panel provided by the embodiment of the present invention, as shown in FIG. 5 , the second electrode 13 and the fourth electrode 13 are the same electrode and are arranged on the entire surface.

Wherein, the second electrode can be used as the common electrode of the adjustable photonic crystal structure, and the fourth electrode can be used as the common electrode of the white electroluminescent device, so the two electrodes can be reused to reduce the setting of film layers.

Optionally, in the display panel provided in the embodiment of the present invention, the tunable photonic crystal layer includes: a red tunable photonic crystal, a green tunable photonic crystal, and a blue tunable photonic crystal;

Among them, the red adjustable photonic crystal is configured to reflect the red band part of the light emitted by the white electroluminescent device, the green adjustable photonic crystal is configured to reflect the green band part of the light emitted by the white electroluminescent device, and the blue adjustable The photonic crystal is configured to reflect the blue wavelength portion of the light emitted by the white electroluminescent device.

Specifically, in the display panel provided by the embodiment of the present invention, when the controllable tube crystal layer controls its reflected color by applying a voltage to the electrodes, the adjustable voltage in each light-emitting structure can be controlled by applying a voltage to the first electrode and the second electrode. Regulate the corresponding wavelength band of the light reflected by the photonic crystal (for example, it can be three colors of red/green/blue), and the corresponding wavelength band of the reflected light of each light-emitting structure is variable according to the applied voltage, for example, for a certain The adjustable photonic crystal in the light-emitting structure can reflect red light in the first frame, and can continue to reflect red light in the second frame, or it can be controlled by voltage to reflect green light.

It should be noted that the light reflected by the controllable photonic crystal is not limited to the three primary colors of red, green, and blue. The selection of the three primary colors here is only one example, and the reflection of light of other colors is also within the protection scope of the patent.

Optionally, in the display panel provided by the embodiment of the present invention, as shown in FIG. 5 , it also includes: a white electroluminescent device 3 located on a side away from the adjustable photonic crystal structure 1 and covering all white electroluminescent devices 3 The encapsulation protection layer 5.

Wherein, the encapsulation protection layer may be encapsulation protection resin, of course, may also be other encapsulation protection materials, which are not specifically limited here.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided by any one of the above embodiments.

Among them, the display device is suitable for various types of displays such as organic electroluminescent displays, inorganic electroluminescent displays, active matrix organic light emitting diode displays (Active Matrix/Organic Light Emitting Diode, AMOLED), miniature inorganic electroluminescent devices, etc. .

Embodiments of the present invention provide a light-emitting structure, a display panel, and a display device. The light-emitting structure includes: an adjustable photonic crystal structure, and the adjustable photonic crystal structure has a first surface and a second surface oppositely arranged; a first support structure, the first support structure is located on the first surface, the first support structure has a first support slope forming a first preset angle with the first surface, and is away from the controllable photonic crystal structure by one A light-emitting surface on the side and parallel to the first surface; a white electroluminescent device, the white electroluminescent device is located on the first support slope, and the light-emitting surface of the white electroluminescent device faces the first A supporting slope; the adjustable photonic crystal structure is configured to reflect a predetermined wavelength band of light emitted by the white electroluminescent device to the light-emitting surface. The present invention utilizes the packaged white electroluminescent device as a backlight source, and does not need to set a polarizing structure, which simplifies the preparation process. Meanwhile, the adjustable photonic crystal structure in the present invention is to selectively reflect the light emitted by the white electroluminescent device. , using reflected light for display, which improves the utilization rate of light.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (11)

1. a kind of light emitting structure characterized by comprising

Controllable photon crystal structure, the controllable photon crystal structure have the first surface and the second table being oppositely arranged Face；

First support construction, first support construction are located at the first surface, first support construction have with it is described First surface be in the first preset angle the first supporting oblique surface, and far from the controllable photon crystal structure side and with it is described The parallel light-emitting surface of first surface；

White electroluminescence device, the white electroluminescence device are located on first supporting oblique surface, and the white electricity The light-emitting surface of electroluminescence device is towards first supporting oblique surface；

It is anti-that the controllable photon crystal structure is configured as in the light for issuing the white electroluminescence device default wave band It is incident upon the light-emitting surface.

2. light emitting structure as described in claim 1, which is characterized in that further include: underlay substrate and the second support construction, it is described Second support construction is between the underlay substrate and the controllable photon crystal structure；

Second support construction away from the underlay substrate side have the second supporting oblique surface, second supporting oblique surface with The underlay substrate is in the second preset angle, and second supporting oblique surface is in contact with the second surface.

3. light emitting structure as claimed in claim 2, which is characterized in that first supporting oblique surface and second supporting oblique surface Inclined direction it is consistent, and second preset angle be equal to first preset angle.

4. light emitting structure as claimed in claim 2, which is characterized in that the controllable photon crystal structure includes: successively position In first electrode, controllable layer of photonic crystals and second electrode on the underlay substrate；

The controllable layer of photonic crystals is configured as reflecting under the driving of the first electrode and the second electrode default The light of wave band.

5. light emitting structure as claimed in claim 4, which is characterized in that further include: described in first support construction The third electrode of light-emitting surface side, and positioned at the 4th electrode of the first surface, and the third electrode and the described 4th Electrode is transparent electrode；

The third electrode is electrically connected with the anode of the white electroluminescence device, and the 4th electrode and the white are electroluminescent The cathode of luminescent device is electrically connected.

6. a kind of display panel, which is characterized in that including multiple compact arranged as described in any one in claim 1-5 luminous Structure, the controllable photon crystal structure in all light emitting structures is in being wholely set.

7. display panel as claimed in claim 6, which is characterized in that all controllable photon crystal structures are located at same On second supporting oblique surface of second support construction.

8. display panel as claimed in claim 7, which is characterized in that the second electrode and the 4th electrode are same electricity Pole, and whole face is arranged.

9. such as the described in any item display panels of claim 6-8, which is characterized in that the controllable layer of photonic crystals includes: Red controllable photonic crystal, the controllable photonic crystal of green and the controllable photonic crystal of blue；

Wherein, the controllable photonic crystal of red is configured as reflecting the red of the issued light of the white electroluminescence device Band part, the controllable photonic crystal of green are configured as reflecting the green of the issued light of the white electroluminescence device Band part, the controllable photonic crystal of blue are configured as reflecting the blue of the issued light of the white electroluminescence device Band part.

10. such as the described in any item display panels of claim 6-8, which is characterized in that further include: it is located at the electroluminescent hair of white Optical device deviates from the controllable photon crystal structure side, and covers the packaging protection of all white electroluminescence devices Layer.

11. a kind of display device, which is characterized in that including such as described in any item display panels of claim 6-10.