WO2019051988A1 - Optical thin film, organic electroluminescent display panel and manufacturing method therefor - Google Patents

Abstract

An optical thin film (5) comprising a transparent thin film body (1), a side surface of the thin film body (1) comprising a plurality of grooves (3), and a projection (2) formed between adjacent grooves (3). An organic electroluminescent display panel, comprising an organic electroluminescent device and an encapsulation layer (42) disposed on the organic electroluminescent device, and further comprising the optical thin film (5), the optical thin film ( 5) being disposed on a side surface, opposite the organic electroluminescent device, of the encapsulation layer (42), and the grooves (3) are arranged opposite a light-emitting area of the organic electroluminescent device. The present invention relates to a method of manufacturing an organic electroluminescent display panel. The grooves (3) are arranged on the thin film body (1), and an existing polarizer is replaced by the optical thin film, so that natural light is projected into the grooves (3) and is then annihilated due to the loss of light caused by multiple reflections, thereby reducing the loss of light emitted by an organic electroluminescent device itself, while also reducing the influence of natural light on the organic electroluminescent device, and further reducing the costs of production.

Description

Optical film, organic electroluminescence display panel and manufacturing method thereof Technical field

The invention relates to a liquid crystal display panel technology, in particular to an optical film, an organic electroluminescence display panel and a manufacturing method thereof.

Background technique

With the development of information technology and mobile communication technology, display devices capable of displaying visual images have also been developed. Flat panel display devices such as liquid crystal display (LCD) devices and organic light emitting display (OLED) devices are developed and used.

In general, an LCD device includes a liquid crystal panel including an upper substrate (a color filter (CF) substrate) and a lower substrate (a thin film transistor array (TFT) substrate) and a liquid crystal layer between the upper substrate and the lower substrate ( LC). The liquid crystal layer is driven by an electric field generated between the pixel electrode and the common electrode to display an image. The OLED device includes an organic light emitting diode including an anode, a cathode, and an organic light emitting layer between the anode and the cathode. In an organic light emitting diode, holes and electrons from the anode and the cathode, respectively, are combined such that light is emitted from the organic light emitting layer to display an image.

Among them, AMOLED (Active-matrix organic light emitting diode) has the characteristics of high resolution, wide viewing angle, fast response, self-illumination, etc., and is widely used in order to avoid external natural light to organic electroluminescent devices. The glare effect caused by most OLED products currently chooses λ/4 polarizer and linear polarizer to eliminate the influence of external natural light on AMOLED. Although it can avoid the influence of external natural light on AMOLED, it also leads to organic electroluminescence. Nearly 50% of the device's self-illumination is lost.

Summary of the invention

In order to overcome the deficiencies of the prior art, the present invention provides an optical film, an organic electroluminescence display panel, and a method of fabricating the same, thereby reducing the influence of natural light on the organic electroluminescent device and the loss of self-luminescence of the organic electroluminescent device.

The present invention provides an optical film comprising a transparent film body having a plurality of grooves disposed on one surface of the film body and protrusions formed between adjacent grooves.

Further, the array of grooves is arranged to form a grid-like structure.

Further, the cross-sectional shape of the protrusion is a rectangle, an arc or a triangle.

Further, the film body is made of a metal material or a ceramic material.

Further, the groove has a width of 20-50 nm and a depth of 30-120 nm.

Further, the protrusion has a width of 10-20 nm.

The present invention also provides an organic electroluminescence display panel comprising an organic electroluminescence device and an encapsulation layer disposed on the organic electroluminescence device, further comprising the optical film disposed on the encapsulation layer away from the organic electricity On one side surface of the light-emitting device, the groove is disposed opposite to the sub-pixel.

The invention also provides a method for fabricating an organic electroluminescence display panel. After the encapsulation layer is formed, a transparent film is formed on a surface of the encapsulation layer facing away from the organic electroluminescent device;

After the transparent film is patterned, an optical film having a plurality of grooves is formed, the grooves being disposed opposite to the sub-pixels.

Further, the transparent film has a thickness of 50 to 150 nm.

Further, the array of grooves is arranged to form a grid-like structure.

Compared with the prior art, the present invention provides a groove on the film body, and replaces the existing polarizer by the optical film, so that natural light is projected into the groove and then annihilated by multiple reflections to cause light loss, thereby reducing natural light. The effect on the organic electroluminescent device also reduces the loss of self-luminescence of the organic electroluminescent device, and also reduces the production cost.

DRAWINGS

Figure 1 is a plan view of an optical film of the present invention;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

3 is a schematic structural view of an organic electroluminescence display panel of the present invention;

4 is a schematic structural view of an organic electroluminescence display device with a touch screen according to the present invention;

Figure 5 is a schematic view showing the formation of a transparent film on the encapsulation layer of the present invention;

Figure 6 is a schematic view of the transparent film after the present invention is patterned;

Figure 7 is a schematic view of the natural light of the present invention reflected in a groove;

Figure 8 is a schematic illustration of the self-luminous emission of the OLED of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 and FIG. 2, an optical film of the present invention comprises a transparent film body 1. The film body 1 is provided with a plurality of grooves 3 on one side surface thereof, and a convex portion is formed between adjacent grooves 3. 2, specifically, the orthographic shape of the groove 3 may be rectangular or square, depending on the shape of the sub-pixel; the array of grooves 3 is arranged to form a grid-like structure; the cross section of the protrusion 2 The shape is a rectangle, an arc or a triangle, which is not specifically limited herein; the cross-sectional shape of the groove 3 may be a rectangle, an arc, an inverted trapezoid or other shape, and if the section of the groove 3 is a rectangle, the bottom of the groove 3 The joint with the surrounding groove wall may be a circular transition surface.

In the present invention, the film body 1 may be made of a metal material or a ceramic material, for example, the metal material is ruthenium, osmium or calcium, and the ceramic material is a polyoxide.

The film body 1 has a thickness of 50-150 nm, the groove 3 has a width of 20-50 nm, and a depth of 30-120 nm; and the protrusion 2 has a width of 10-20 nm.

In the present invention, the reflection coefficient of the film body 1 is larger than the projection coefficient. This structure mainly applies the optical black hole effect, so that the external natural light is irradiated onto the optical film, as shown in FIG. Multiple reflections cause the natural light loss of the outside world to be annihilated. If some natural light can still be emitted from the structure after multiple reflections, and because of the design of the pattern (the groove on the film body), the light emitted is diffusely reflected, and the effect on the self-luminescence of the OLED is negligible. However, the self-luminous OLED can be emitted through the film body 1 (as shown in FIG. 8).

As shown in FIG. 3, the present invention discloses an organic electroluminescence display panel using the above optical film, comprising an organic electroluminescent layer 41 and an encapsulation layer 42 disposed on the organic electroluminescent layer 41, and an optical film. 5, the optical film 5 is disposed on a side of the encapsulating layer 42 facing away from the organic electroluminescent layer 41, wherein the optical film comprises a transparent film body 1, and the film body 1 is provided with a plurality of recesses on one side surface thereof a groove 3, a protrusion 2 is formed between adjacent grooves 3, in particular, a front projection of the groove 3 The shape of the shadow may be a rectangle or a square, depending on the shape of the sub-pixel; the array of grooves 3 is arranged to form a grid-like structure; the cross-sectional shape of the protrusion 2 is a rectangle, an arc or a triangle. The cross-sectional shape of the groove 3 may be a rectangle, an arc, an inverted trapezoid or other shapes. If the cross section of the groove 3 is a rectangle, the joint of the bottom of the groove 3 and the surrounding groove wall may be an arc. Transition surface.

The groove 3 is disposed opposite to the sub-pixel, and the opening direction of the groove 3 faces away from the encapsulation layer 42.

Further, the above organic electroluminescence display panel further includes a rigid substrate 43, a flexible substrate 44 sequentially disposed on the rigid substrate 43, an array substrate layer 45, and a top electrode (not shown). The organic electroluminescent layer 41 is disposed between the array substrate layer 45 and the top electrode.

The array substrate layer 45 includes a buffer layer, an active layer, a gate insulating layer, a gate layer, an interlayer insulating layer, a source/drain, a flat layer, a bottom electrode, and a pixel defining layer which are sequentially formed on the flexible substrate 44. The present invention is not limited thereto. The structure of the array substrate layer 45 may be an array substrate layer for an OLED in the prior art, which is not specifically limited herein.

The organic electroluminescent layer 41 includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer, which are sequentially disposed from the bottom electrode to the top electrode. The organic electroluminescent layer 41 is an organic electroluminescent device structure used in an OLED display panel in the prior art, and is not specifically limited herein.

In the present invention, the position of each sub-pixel is spaced between the pixel defining layers, that is, the position of the ridge 2 of the film body 1 can correspond to the position of the pixel defining layer, so that each groove 3 is one-to-one with the sub-pixel. Correspondingly, the sub-pixels referred to herein include sub-pixels for displaying colors such as RGB.

The film body 1 may be made of a metal material or a ceramic material, for example, the metal material is ruthenium, osmium or calcium, and the ceramic material is a polyoxide.

The film body 1 has a thickness of 50-150 nm, the groove 3 has a width of 20-50 nm, and a depth of 30-120 nm; and the protrusion 2 has a width of 10-20 nm.

The manufacturing method of the organic electroluminescent display panel comprises the following steps:

After the encapsulation layer 42 is formed, a transparent film is formed on the surface of the encapsulation layer 42 facing away from the organic electroluminescent layer 41; specifically, the surface of the encapsulation layer 42 is formed by evaporation or sputtering. A transparent film (shown in Figure 5) having a thickness of 50-150 nm is used.

After the transparent film is patterned, an optical film 5 having a plurality of grooves 3 (shown in FIG. 6) is formed. Specifically, the patterning may be performed by etching, such as a photolithography process, and the grooves 3 and The light-emitting areas of the electroluminescent layer 41 are oppositely disposed.

The grooves 3 are arranged in an array to form a grid-like structure, and each of the grooves 3 has a one-to-one correspondence with the sub-pixels.

The groove 3 has a width of 20-50 nm and a depth of 30-120 nm; and the protrusion 2 has a width of 10-20 nm.

The shape of the groove 3 may be a rectangle or a square, depending on the shape of the sub-pixel; the groove 3 is arranged in an array to form a grid-like structure; if the section of the groove 3 is a rectangle, the bottom of the groove 3 The joint with the surrounding groove wall may be a circular arc transition surface; the cross-sectional shape of the protrusion 2 is a rectangle, an arc or a triangle, which is not specifically limited herein.

The optical film may be made of a metal material or a ceramic material, for example, the metal material is ruthenium, osmium or calcium, and the ceramic material is a polyoxide.

In the above-described manufacturing method, the encapsulating layer 42 and the following regions (such as the organic electroluminescent layer 41, the array substrate layer 45, and the like) are produced by the prior art, and are not specifically limited herein.

As shown in FIG. 4, when the organic electroluminescence display panel of the present invention is fabricated into a display device having a touch panel, after applying an adhesive 6 on the optical film 5, the touch panel 7 is passed through the adhesive 6 and the organic electro-electricity. The light emitting display panels are bonded together, and then the cover glass 8 is assembled on the touch screen 7.

The optical film of the invention can not only eliminate the influence of external natural light on the OLED device, but also does not affect the light emitted by the OLED itself. At the same time, because there is no design of the polarizer, the thickness of the OLED device can be reduced by about 100 μm, the OLED device can be made thinner, and the OLED device can be more resistant to bending, and the flexible OLED design can be realized.

While the invention has been shown and described with respect to the specific embodiments the embodiments of the embodiments of the invention Various changes in details.

Claims (15)

An optical film comprising: a transparent film body, wherein a side surface of the film body is provided with a plurality of grooves, and protrusions are formed between adjacent grooves. The optical film of claim 1 wherein said array of grooves is arranged to form a grid-like structure. The optical film according to claim 1, wherein the convex cross-sectional shape is a rectangle, an arc or a triangle. The optical film according to claim 1, wherein the film body is made of a metal material or a ceramic material. The optical film according to claim 1, wherein said groove has a width of 20 to 50 nm and a depth of 30 to 120 nm. The optical film according to claim 1, wherein said protrusion has a width of 10 to 20 nm. An organic electroluminescent display panel comprising an organic electroluminescent layer and an encapsulation layer disposed on the organic electroluminescent layer, wherein: further comprising an optical film, the optical film comprising a transparent film body, the film body A plurality of grooves are disposed on one side surface, and protrusions are formed between adjacent grooves; an optical film is disposed on a side surface of the encapsulation layer facing away from the organic electroluminescent layer, the grooves being disposed opposite to the sub-pixels. The organic electroluminescence display panel according to claim 7, wherein said array of grooves is arranged to form a grid-like structure. The organic electroluminescence display panel according to claim 7, wherein the convex cross-sectional shape is a rectangle, an arc or a triangle. The organic electroluminescence display panel according to claim 7, wherein the film body is made of a metal material or a ceramic material. The organic electroluminescence display panel according to claim 7, wherein the groove has a width of 20 to 50 nm and a depth of 30 to 120 nm. The organic electroluminescence display panel according to claim 7, wherein the protrusion has a width of 10 to 20 nm. A method for fabricating an organic electroluminescence display panel, wherein: after the encapsulation layer is formed, a transparent film is formed on a surface of the encapsulation layer facing away from the organic electroluminescent layer; After the transparent film is patterned, an optical film having a plurality of grooves is formed, the grooves being disposed opposite to the sub-pixels. The method of fabricating an organic electroluminescence display panel according to claim 13, wherein the transparent film has a thickness of 50 to 150 nm. The method of fabricating an organic electroluminescence display panel according to claim 13, wherein the array of grooves is arranged to form a grid-like structure.

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