TWI473529B - Three dimensional light emitting diode display device - Google Patents

Description

3D light emitting diode display device

The present invention relates to a light emitting diode display device, and more particularly to a 3D light emitting diode display device.

Due to the vigorous development of the optoelectronic industry, people pursue high-quality visual enjoyment, from the early traditional bulk cathode ray tube display (CRT) to the high-quality flat panel display (FPD), for example Liquid crystal display (LCD), plasma display panel (PDP), Field Emission Display (FED), and Electroluminescence Display (ELD). Compared with other flat panel displays, electroluminescent displays are particularly popular among consumers because of their self-illumination, high brightness, wide viewing angle, high response speed, and thin and light panels.

With the increasing popularity of 3D technology, the market demand for 3D-enabled electroluminescent displays has gradually increased. The electroluminescent display is further classified into an organic light emitting diode display device and an inorganic light emitting diode display device according to the chemical materials used.

FIG. 1 is a general LED display device having a cathode 110, a light emitting structure layer 120, an anode 130, a transparent substrate 140, a polarizer 150, and a phase having two phases. The phase retardation film 160 of the retardation values 160A and 160B. The polarizer 150 and the phase retardation film 160 convert the image into two polarization states, and then the polarized glasses can be separated to achieve a 3D effect.

The 3D light-emitting diode display device provided by the invention utilizes a plurality of parallel micro-trench structures on the surface of the cathode, so that the compounds in the light-emitting structure layer are arranged in a specific direction to emit a specific directional light source to achieve polarized light. efficacy. Therefore, the polarizer element required for a general 3D light-emitting diode display device can be omitted, and the process can be simplified.

In order to achieve the above object, the present invention provides a 3D light emitting diode display device. According to an aspect of the present invention, the 3D LED display device includes a phase retardation film, a transparent substrate, an anode, a light emitting structure layer, and a cathode. The surface of the cathode contacting the light-emitting structure layer has a plurality of first regions and a plurality of second regions. The widths of the first region and the second regions respectively correspond to the width of the sub-pixel unit. The first regions have a plurality of first parallel micro-grooves, the second regions have a plurality of second parallel micro-grooves, and the first region and the second region are staggered in parallel with each other, and The length direction of a parallel micro-groove is perpendicular to the length direction of the second parallel micro-grooves. The phase retardation film described above has a 1/4 phase retardation value.

According to another aspect of the present invention, a 3D light emitting diode display device includes a phase retardation film, a transparent substrate, an anode, a light emitting structure layer, and a cathode. The surface of the cathode contacting the light-emitting structure layer has a plurality of first regions and a plurality of second regions. The widths of the first region and the second regions respectively correspond to the width of the sub-pixel unit. The first regions have a plurality of first parallel micro-grooves, the second regions have a plurality of second parallel micro-grooves, and the first region and the second region are staggered in parallel with each other, and The length direction of a parallel microchannel is parallel to the length direction of the second parallel microchannels. The phase retardation film described above has two phase delay values, and the difference between the phase retardation values of the two is 180°.

In order to make the above-mentioned contents of the present invention more comprehensible, various embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

For the benefit of the examiner to understand the creative features, contents and advantages of the present invention and the effects thereof, the present invention will be described in detail with reference to the accompanying drawings, and the drawings used therein, The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

Please refer to Figure 2. 2 is a schematic structural view of a 3D light emitting diode display device 200 according to a preferred embodiment of the present invention. The display structure comprises a transparent substrate 240, an anode 230, a light emitting structure layer 220, a cathode 210 and a phase retardation film 250.

The transparent substrate 240 is composed of a transparent glass substrate or a transparent flexible substrate, and may be, for example, a transparent plastic or a transparent metal foil.

The anode 230 is composed of a light-transmitting material, and may be, for example, Indium tin oxide (ITO), which is disposed on one side of the transparent substrate 240.

The light-emitting structure layer 220 is a chemical material having self-luminous properties, and is disposed on the anode 230. The chemical materials may be composed of a high molecular polymer, a small molecular organic compound or an inorganic metal complex. In order to emit a light source of a particular wavelength, the chemical material generally has a design of a linear polyphenyl ring structure. However, as the market demand changes, the design of the disc-shaped polyphenyl ring structure is also derived. When the 3D LED display device 200 is energized, the holes released by the anode 230 and the electrons emitted from the cathode 210 will combine with the light-emitting structure layer 220 to generate photons and emit light energy. In order to improve the luminous efficiency of the 3D LED display device, an electron conducting layer such as 8-hydroxyquinoline aluminum (AlQ ₃ ) may be disposed between the light emitting structure layer 220 and the cathode 210. By the energy level combination of the cathode and the electron conducting layer, the electrons released by the cathode can be more smoothly transmitted to the light emitting structure layer 220. In addition, a hole conducting layer, such as an aromatic compound having a polyamine, may be disposed between the light emitting structure layer 220 and the anode 230, so that the hole released by the anode can be smoothly transmitted to the light emitting structure layer 220 to improve The efficiency of combining with electronics.

The cathode 210 is a low-power metal, for example, a group consisting of silver, aluminum, magnesium, calcium and lithium, which is disposed on the light-emitting structure layer 220. The surface of the cathode 210 contacting the light-emitting structure layer has a plurality of parallel micro-grooves (not shown). The parallel micro-channel structures can be used to arrange the compounds in the light-emitting structure layer 220 in a specific direction to emit A light source in a specific direction.

The phase retardation film 250 has a 1/4 phase retardation value which is located on the other side of the transparent substrate 240.

Fig. 3 is a plan view showing the surface structure of the cathode 210 of Fig. 2. The surface of the cathode 210 has a plurality of first regions 211 and a plurality of second regions 212. The first region 211 and the second regions 212 are staggered in parallel with each other, and the widths of the first region 211 and the second regions 212 respectively correspond to the width of the sub-pixel unit. The first region 211 has a plurality of first parallel micro trenches 211A, and the second regions 212 have a plurality of second parallel micro trenches 212B, wherein the first parallel micro trenches 211A have a length direction and the second The longitudinal direction of the parallel micro-grooves 212B is perpendicular. For example, the longitudinal direction of the first parallel micro-grooves 211A is substantially 45 degrees from the horizontal plane, and the longitudinal direction of the second parallel micro-grooves 212B is substantially opposite to the horizontal plane. The upper is 135 degrees.

4 is a cross-sectional view showing the first region 211 of FIG. The width W211A of each of the first parallel micro-grooves 211A in the first region is substantially the same as the width W212B (not shown) of each of the second parallel micro-channels 212B, in order to make the light-emitting structure layer The chemical material, such as a linear polyphenylene ring compound or a discotic polyphenylene ring compound, may be arranged in a specific direction to emit a light source in a specific direction, and the width W211A of each of the first parallel microchannels 211A in the first regions is higher. Preferably, it is between 1 micrometer (μm) and 100 micrometers (μm). The height H211A of each of the first parallel microchannels 211A is substantially the same as the height H212B (not shown) of each of the second parallel microchannels 212B, for example, between 100 nanometers (nm) and 1 micrometer (μm). . Furthermore, the distance between the two adjacent first parallel micro-grooves 211A G211A and the two adjacent second parallel micro-grooves 212B is substantially the same as G212B (not shown), for example, It is between 1 micrometer (μm) and 100 micrometers (μm).

The parallel microchannels on the first region 211 and the second region 212 of the surface of the cathode 210 may be formed by an etching process or may be formed by a laser process. In the present invention, the parallel micro-grooves 211A and 212B are formed by dry etching. The methods are not intended to limit the technical scope of the present invention, and the parallel micro-grooves formed by any means are within the scope of the present invention.

After the parallel micro-grooves on the surface of the cathode 210 are formed, the compounds in the light-emitting structure layer 220 may be arranged in a specific direction on the surface of the cathode 210 by vacuum evaporation or spin coating. Inside the groove. Therefore, when the 3D LED display device is energized, the electrons and holes are combined in the light-emitting structure layer 220, and a specific directional light source is radiated to achieve the effect of polarized light. Therefore, the light-emitting structure layer 220 on the first region 211 of the surface of the cathode 210 emits linearly polarized light at an angle of 45 degrees with respect to the horizontal plane, and the light-emitting structure layer located at the second region 212 of the surface of the cathode 210 emits an angle of 135 with the horizontal plane. Degree of linearly polarized light.

Then, the two different directional linearly polarized lights penetrate a phase retardation film 250 having a 1/4 phase retardation value. Referring to FIG. 5, the 3D LED display device emits images of two polarization states. For example, the 45-degree linearly polarized light emitted by the light-emitting structure layer 220 on the first region 211 of the surface of the cathode 210 will be converted into left-handed polarized light by the phase retardation film 250 having a 1/4 phase retardation value. The 135-degree linearly polarized light emitted by the light-emitting structure layer 220 on the second region 212 of the surface of the cathode 210 is converted into right-handed polarized light by the phase retardation film 250 having a 1/4 phase retardation value. Finally, with the polarized glasses to separate the images, the viewer can produce 3D visual effects in the brain.

Figure 6 is a plan view of a cathode surface structure in accordance with another preferred embodiment of the present invention. The surface of the cathode 310 has a plurality of first regions 221 and a plurality of second regions 222. The first region 221 and the second regions 222 are arranged in parallel with each other, and the widths of the first region 221 and the second regions 222 respectively correspond to the width of the sub-pixel unit. The first regions 221 have a plurality of first parallel micro-channels 221A, and the second regions 222 have a plurality of second parallel micro-channels 222B, wherein the first parallel micro-channels 221A have a length direction and the second The longitudinal direction of the parallel microchannels 222B is parallel. For example, the longitudinal direction of the first parallel microchannels 221A and the longitudinal direction of the second parallel microchannels 222B are substantially 90 degrees from the horizontal plane.

The width W221A (not shown) of each of the first parallel micro-grooves 221A on the surface of the cathode is substantially the same as the width W222B of each of the second parallel micro-channels 222B (not shown), in order to make the light-emitting structure layer The chemical material in the middle, such as a linear polyphenylene ring compound or a discotic polyphenylene ring compound, may be arranged in a specific direction to emit a light source in a specific direction, and each of the first parallel microchannels 221A has a width of 1 micrometer (μm) to 100. Between microns (μm). Moreover, the height H221A (not shown) of each of the first parallel micro-grooves 221A is substantially the same as the height H222B (not shown) of each of the second parallel micro-grooves 222B, for example, 100 nm ( Between nm) and 1 micrometer (μm). The distance between G221A (not shown) and the adjacent two of the second parallel micro-grooves between two adjacent first parallel micro-grooves 221A is substantially the distance G212B (not shown) The same is true, for example, between 1 micrometer (μm) and 100 micrometers (μm).

The parallel micro-channel design on the cathode converts the light source emitted by the light-emitting structure layer into a linearly polarized light having 90 degrees, and transforms the linearly polarized light through a phase difference retardation film having two phase retardation values. It is a light source of two polarization states. The two images are separated by polarized glasses to obtain a 3D stereoscopic image.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100, 200. . . 3D light emitting diode display device

110, 210, 310. . . cathode

120, 220. . . Light structure layer

130, 230. . . anode

140, 240. . . Transparent substrate

150. . . Polarizer

160, 250. . . Phase retardation film

160A. . . First phase delay value

160B. . . Second phase delay value

211, 221. . . First area

211A, 221A. . . First parallel microchannel

212, 222. . . Second area

212B, 222B. . . Second parallel microchannel

H211A. . . height

G211A. . . spacing

W211A. . . width

FIG. 1 is a schematic view showing the structure of a general 3D light emitting diode display.

2 is a schematic structural view of a 3D light emitting diode display according to a preferred embodiment of the present invention.

Figure 3 is a schematic view showing the surface structure of a cathode according to a preferred embodiment of the present invention.

Figure 4 is a cross-sectional view showing a first region of a preferred embodiment of the present invention.

Figure 5 is a schematic view showing the polarization state of a light source according to a preferred embodiment of the present invention.

Figure 6 is a schematic view showing the surface structure of a cathode of another embodiment of the present invention.

210. . . cathode

211. . . First area

211A. . . First parallel microchannel

212. . . Second area

212B. . . Second parallel microchannel

Claims (9)

A 3D light emitting diode display device comprising: a transparent substrate; an anode disposed on one side of the substrate; a light emitting structure layer disposed on the anode; and a cathode disposed on the light emitting structure On the layer, the surface of the cathode contacting the light-emitting structure layer has a plurality of first regions and a plurality of second regions, wherein the widths of the first regions and the second regions respectively correspond to the widths of the sub-pixel units, and The first region has a plurality of first parallel micro-grooves, the second region has a plurality of second parallel micro-grooves, the first region and the second region are staggered in parallel with each other; and a phase retardation film is disposed on The other side of the transparent substrate and containing at least one phase delay value. The 3D light emitting diode display device of claim 1, wherein a length direction of the first parallel microchannel is parallel to a length direction of the second parallel microchannel. The 3D LED display device of claim 2, wherein an angle between a longitudinal direction of the first parallel microgroove and a horizontal plane is substantially 90 degrees. The 3D light emitting diode display device of claim 1, wherein a length direction of the first parallel microchannel is perpendicular to a length direction of the second parallel microchannel. The 3D LED display device of claim 4, wherein an angle between a longitudinal direction of the first parallel micro-groove and a horizontal plane is substantially 45 degrees, and a length direction of the second parallel micro-groove is The angle between the horizontal planes is substantially 135 degrees. The 3D LED display device of claim 1, wherein a width of each of the first parallel microchannels and a width of each of the second parallel microchannels are between 1 micrometer and 100 micrometers. . The 3D LED display device of claim 1, wherein the height of each of the first parallel microchannels and the height of each of the second parallel microchannels are between 100 nm and 1 micrometer. between. The 3D LED display device of claim 1, wherein a distance between two adjacent first parallel microchannels and a distance between two adjacent second parallel microchannels , between 1 micron and 100 microns. The 3D light emitting diode display device according to claim 1, wherein the phase retardation film has a 1/4 phase retardation value.