CN211786501U

CN211786501U - Display device

Info

Publication number: CN211786501U
Application number: CN202020283582.XU
Authority: CN
Inventors: 王灿; 唐志强; 陈宇; 张超
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-10-27
Anticipated expiration: 2030-03-09

Abstract

The utility model discloses a display device, include: the display panel comprises a first display panel and a second display panel positioned on the light emitting side of the first display panel; the adhesive layer is positioned at the edge positions of the first display panel and the second display panel and used for bonding the first display panel and the second display panel; and a transparent layer between the first display panel and the second display panel for filling a gap between the first display panel and the second display panel. Since the adhesive layer has a certain thickness, there is a certain gap between the first display panel and the second display panel after the adhesion, and a transparent layer is disposed at the gap for filling the gap, so that the first display panel and the second display panel can be supported. Therefore, the first display panel and the second display panel can be prevented from being deformed due to bending towards one side of the gap, the distance between the first display panel and the second display panel is kept unchanged, and the problem that the display device generates interference fringes is avoided.

Description

Display device

Technical Field

The utility model relates to a show technical field, especially relate to a display device.

Background

A Liquid Crystal Display (LCD) has the advantages of high image quality, power saving, thin body, and wide application range, and is still dominant in the Display field. The traditional liquid crystal display has great advantages in the aspect of white field brightness by adopting a mode of matching a backlight source with a liquid crystal display panel, but has defects in the aspects of visual angle, black field expression and contrast.

In order to make up for the defects of the liquid crystal display, a display scheme of a double-layer display module is provided, two display panels are arranged in a laminated manner, and the lower display panel can achieve pixel-level light control; the upper display panel is used for displaying images, the contrast of the displayed images can be greatly improved, and when the double-layer display module is turned off, the black field brightness is greatly reduced.

The current laminated display device usually adheres two display panels together in a full-face manner, but the adhering manner has low production efficiency and high cost. Therefore, a bonding method using a double-sided adhesive tape for a frame is proposed, but the bonding method causes non-uniform gap between two panels, so that the optical path difference of light at the gap is not uniform, which causes ring-shaped defects on the display surface and affects the viewing effect.

SUMMERY OF THE UTILITY MODEL

The utility model provides a display device for avoid stromatolite display device to produce and interfere the line, optimize the viewing effect.

The utility model provides a display device, include:

a first display panel for controlling a backlight;

the second display panel is positioned on the light emergent side of the first display panel and used for displaying images;

an adhesive layer located at an edge position of the first display panel and the second display panel for adhering the first display panel and the second display panel;

a transparent layer between the first display panel and the second display panel for filling a gap between the first display panel and the second display panel.

In some embodiments of the present application, in the above display device provided by the present invention, the bonding layer adopts one of ultraviolet moisture curing glue, two-liquid mixed hardening glue or moisture curing reaction type polyurethane hot melt adhesive.

In some embodiments of the present application, in the above display device provided by the present invention, the width of the adhesive layer is 0.5mm to 2.0 mm.

In some embodiments of the present application, in the above display device provided by the present invention, the thickness of the adhesive layer is 0.15mm to 0.4 mm.

In some embodiments of the present application, in the above display device provided by the present invention, the thickness of the transparent layer is 0.15mm to 0.35 mm.

In some embodiments of the present application, in the above display device provided by the present invention, the display device includes a layer of the transparent layer; the transparent layer is adhered on the first display panel.

In some embodiments of the present application, in the above display device provided by the present invention, the display device includes at least two transparent layers; the transparent layer adjacent to the first display panel is adhered on the first display panel, and the transparent layer adjacent to the second display panel is adhered on the second display panel.

In some embodiments of the present application, in the above display device provided by the present invention, the transparent layer includes at least one of a prism sheet or a moth-eye film.

In some embodiments of the present application, in the above display device provided by the present invention, the bonding strength of the bonding layer is greater than 2mpa, the 60-degree shear bonding strength is 1mpa, and the tensile elongation is greater than 150%.

In some embodiments of the present invention, in the above display device provided in the present invention, the first display panel is a liquid crystal display panel or an organic light emitting diode display panel;

the second display panel is a liquid crystal display panel.

The utility model discloses beneficial effect as follows:

the utility model provides a display device, include: a first display panel for controlling a backlight; the second display panel is positioned on the light emergent side of the first display panel and used for displaying images; the adhesive layer is positioned at the edge positions of the first display panel and the second display panel and used for bonding the first display panel and the second display panel; and a transparent layer between the first display panel and the second display panel for filling a gap between the first display panel and the second display panel. Since the adhesive layer has a certain thickness, there is a certain gap between the first display panel and the second display panel after the adhesion, and a transparent layer is disposed at the gap for filling the gap, so that the first display panel and the second display panel can be supported. Therefore, the first display panel and the second display panel can be prevented from being deformed due to bending towards one side of the gap, the distance between the first display panel and the second display panel is kept unchanged, and the problem that the display device generates interference fringes is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a stacked display device according to the prior art;

FIG. 2 is a schematic diagram of a prior art annular interference pattern generated by a stacked display device;

fig. 3 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;

fig. 4 is a schematic top view of a display device according to an embodiment of the present invention;

fig. 5 is a second schematic cross-sectional view of a display device according to an embodiment of the present invention;

fig. 6 is a third schematic cross-sectional view of a display device according to an embodiment of the present invention;

fig. 7 is a fourth schematic cross-sectional view of a display device according to an embodiment of the present invention;

fig. 8 is a fifth schematic cross-sectional view of a display device according to an embodiment of the present invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words for expressing the position and direction described in the present invention are all the explanations given by taking the drawings as examples, but can be changed according to the needs, and the changes are all included in the protection scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship and do not represent true proportions.

Compared with the traditional display device, the laminated display technology has great competitiveness in pattern bright and dark gradation and fine color presentation. The stacked display device may include two layers of display panels, the lower layer of display panels may achieve pixel level light control; the upper display panel is used for displaying images, so that the contrast of the displayed images can be greatly improved, and when the double-layer display module is turned off, the black field brightness is greatly reduced.

As shown in fig. 1, when the display panel a and the display panel B are bonded together by using the double-sided adhesive tapes around, a certain gap exists between the display panel a and the display panel B due to the certain thickness of the double-sided adhesive tapes. When one of the two display panels is deformed due to external force or the characteristics of the materials of the two display panels, the intervals of the display panel A and the display panel B at the positions are unequal. As shown in fig. 1, the optical path difference between the reflected light and the incident light reflected by the light incident into the gap is not equal, so that a ring-shaped interference pattern as shown in fig. 2 is subjectively formed, which affects the viewing effect.

In view of this, the embodiment of the present invention provides a display device for avoiding the stacked display device from generating interference fringes and optimizing the viewing effect.

Fig. 3 is one of the schematic cross-sectional structural diagrams of the display device provided by the embodiment of the present invention, and fig. 4 is the schematic top view structural diagram of the display device provided by the embodiment of the present invention, as shown in fig. 3 and fig. 4, the embodiment of the present invention provides a display device, including:

a first display panel 11 for controlling the backlight.

The embodiment of the utility model provides an above-mentioned display device is stromatolite display device, and first display panel 11 is located the below for control is shaded, and to second display panel outgoing light. In specific implementation, the first display panel 11 may only display gray-scale luminance without setting a color film. The first display panel 11 may be driven to provide different display luminances in different areas according to the display image of the upper display panel, so that a higher contrast ratio may be achieved in cooperation with a fine-segmented local dimming technique.

And a second display panel 12 located on the light emitting side of the first display panel 11 for displaying an image.

The second display panel 12 may be a transmissive display panel, is disposed on the light exit side of the first display panel 11, and modulates and emits light emitted from the first display panel 11. The second display panel 12 may include a plurality of pixel units arranged in an array, and each pixel unit may independently control transmittance and color of light incident thereto from the first display panel 11, so that the light transmitted through all the pixel units constitutes a displayed image.

The image display is carried out by adopting the laminated display panel, the bright and dark layers and the fineness of the patterns can be optimized, and the display effect is more excellent compared with that of a single-layer display panel.

As shown in fig. 4, an adhesive layer 13 is disposed at an edge position of the first display panel 11 and the second display panel 12 for adhering the first display panel 11 and the second display panel 12.

The embodiment of the utility model provides a form the bond line in one of them display panel's in first display panel 11 and second display panel 12 edge, again with another display panel and its pressfitting to can bond two display panels together, constitute stromatolite display device. Two display panels are bonded by adopting an edge attaching mode, so that the production efficiency is favorably improved.

The adhesive layer 13 may be applied by spot coating or spraying glue on the edge of the first display panel 11 or the second display panel 12, and after the two display panels are bonded in alignment, they are cured, so that they have better adhesion.

And a transparent layer 14 between the first display panel 11 and the second display panel 12 for filling a gap between the first display panel 11 and the second display panel 12.

Because the adhesive layer 13 has a certain thickness, there will be a certain gap between the first display panel 11 and the second display panel 12 after the adhesion, the embodiment of the present invention provides the transparent layer 14 at the gap for filling the gap, so as to support the first display panel 11 and the second display panel 12. Therefore, the first display panel 11 and the second display panel 12 can be prevented from being deformed due to bending towards the gap side, and the distance between the first display panel 11 and the second display panel 12 is kept unchanged, so that the problem that the display device generates interference fringes is avoided.

In practical applications, the transparent layer 14 may be a transparent film or a transparent film, and may not affect the transmittance of light, and may also support the first display panel 11 and the second display panel 12.

In practical applications, the adhesive layer 13 may be made of a colloid material, for example, one of an ultraviolet moisture curable adhesive, a two-liquid hybrid curing adhesive (AB adhesive), or a moisture curable polyurethane hot melt adhesive (PUR adhesive).

In practical application, the ultraviolet moisture-curable adhesive before curing can be coated on the edge of the first display panel 11 or the second display panel 12, the two display panels are aligned and attached, then ultraviolet radiation is used for generating certain viscosity, the adhesive is cured after absorbing water vapor in the air, the adhesive has strong adhesive force, and the first display panel 11 and the second display panel 12 can be bonded together.

The AB glue can be a two-liquid mixed hardening glue, and comprises two liquids, wherein one liquid is the glue, the other liquid is a hardening agent, and the two liquids are hardened after being mixed to achieve stronger bonding force. In practical applications, the AB glue may be applied to an edge position between the first display panel 11 and the second display panel 12, so that the first display panel 11 and the second display panel 12 may be adhered together.

The main component of the PUR adhesive is isocyanate-terminated polyurethane prepolymer. The PUR adhesive has adjustable adhesiveness and toughness, and has excellent adhesive strength, temperature resistance, chemical corrosion resistance and aging resistance. In practical application, the PUR glue can be coated on the edge of the first display panel 11 or the second display panel 12, the two display panels are aligned and attached, after the glue absorbs water vapor in the air, the glue is cured, and the first display panel 11 and the second display panel 12 can be bonded together with strong bonding force.

The embodiment of the utility model provides an in the bond line can adopt UV moisture curing to glue, AB glue or PUR glues etc. and glue the material, through the composition proportion and the processing parameter of adjustment colloid material, can make bond strength of bond line 13 be greater than 2mpa, 60 degrees shear bond strength 1mpa, tensile elongation is greater than 150%. Therefore, the colloid material is suitable for bonding display panels, and a good bonding effect can be achieved by adopting a small amount of colloid.

Because the embodiment of the utility model provides an adopt UV wet cure to glue, AB glue or PUR glue as the bond line, these colloidal materials have stronger adhesion, compare in the double faced adhesive tape that adopts among the prior art, the utility model provides an in the bond line 13 can have narrower linewidth, when concrete implementation, the width setting of bond line 13 just has stronger bonding force when 0.5mm-2.0mm, and further, can set up the linewidth of bond line in 0.7mm-1.2 mm's within range. Setting the width of the adhesive layer 13 within the above range can satisfy the bonding requirements of the first display panel 11 and the second display panel 12. The adhesive layer 13 is set to have a narrower width, which is more advantageous for being applied to a narrow-bezel display device, and meets the design requirements of the narrow-bezel display device.

Similarly, when a UV moisture-curable adhesive, an AB adhesive or a PUR adhesive is used as the adhesive layer, the adhesive force of the adhesive layer is preferable, so that the thickness of the adhesive layer 13 can be reduced to 0.15mm to 0.4mm, and further, the thickness of the adhesive layer 13 can be set to a range of 0.2mm to 0.3 mm. The thickness of the adhesive layer 13 is set within the above range so as to satisfy the adhesion requirement of the first display panel 11 and the second display panel 12. The thinner adhesive layer 13 is also more advantageous for the lightness and thinness of the display device, and the overall thickness of the display device is reduced.

In a specific implementation, the adhesive layer 13 may be disposed at one circumference, the transparent layer 14 may be disposed at an inner side of the adhesive layer 13, and the first display panel 11 and the second display panel 12 may be passed together. The adhesive layer 13 has a certain elasticity, and the adhesive layer 13 can be compressed to a certain degree when the first display panel 11 and the second display panel 12 are pressed, so in the embodiment of the present invention, the thickness of the transparent layer 14 can be set to be 0.15mm-0.35mm, and further, the thickness of the transparent layer 14 can be set to be 0.15mm-0.3mm, so that the thicknesses of the adhesive layer 13 and the transparent layer 14 are approximately equivalent. The area of the transparent layer 14 may be slightly smaller than the areas of the first and

second display panels

11 and 12 so that the adhesive layer 13 may completely surround the transparent layer 14.

In practical applications, the transparent layer 14 may be directly a light-transmitting flat plate, and one or more layers of light-transmitting flat plates are disposed between the first display panel 11 and the second display panel 12, so as to support the first display panel 11 and the second display panel 12, so that the distance between the first display panel 11 and the second display panel 12 is kept unchanged, and generation of interference fringes is avoided.

But directly adopt when printing opacity flat board can't improve reflection or rainbow line scheduling problem between the display panel, consequently the utility model discloses the stratum lucidum 14 in the embodiment of the utility model provides an can adopt one deck or multilayer optical functional film to set up between first display panel and second display panel for improve above-mentioned problem.

Fig. 5 is a second schematic cross-sectional view of the display device according to the embodiment of the present invention, as shown in fig. 5, the display device may include a transparent layer 14, and the transparent layer may be attached to the first display panel 11 through a pressure sensitive adhesive layer s.

The pressure sensitive adhesive layer s is arranged on the reverse side of the transparent layer 14, and the transparent layer 14 is attached and fixed on the first display panel 11 through the pressure sensitive adhesive layer s, so that the transparent layer 14 can be bonded with the first display panel 11, the flatness and uniformity of the film can be guaranteed, and the nonuniformity of subjective optical brightness can be avoided.

The transparent layer 14 may be one of a prism sheet and a moth-eye film.

The rainbow patterns generated by the display device are caused by the difference of the refractive indexes of different film layers in the display device, and the dispersion phenomenon is generated on the interface of the film layers when light enters the film layers with different refractive indexes, so that the subjective rainbow patterns are formed. If an irregular prism film is disposed between the first display panel 11 and the second display panel 12 in the display device, the propagation direction of light may be changed to different directions due to the irregular prism film, so that the phenomenon that light of different colors is refracted to the same direction may be prevented, thereby preventing the generation of rainbow stripes and optimizing the display effect.

The moth-eye film is used to greatly reduce the reflection phenomenon caused by the rapid change of the refractive index by utilizing the gradual change of the refractive index of the moth-eye film. The embodiment of the utility model provides a set up moth's eye membrane then can reduce reflection phenomenon between first display panel 11 in display device and second display panel 12, increase light transmittance.

In another practical implementation manner, the display device may further include at least two transparent layers, and the two transparent layers may use the same optical functional film or different optical functional films, which is not limited herein.

Fig. 6 is a third schematic cross-sectional view of a display device according to an embodiment of the present invention, as shown in fig. 6, the display device at least includes a first transparent layer 141 and a second transparent layer 142. The first transparent layer 141 is adjacent to the first display panel 11 side, and the second transparent layer 142 is adjacent to the second display panel 12 side. In the embodiment of the present invention, the first transparent layer 141 is attached to the first display panel 11 by the first pressure sensitive adhesive layer s1, and the second transparent layer 142 is attached to the second display panel 12 by the second pressure sensitive adhesive layer s 2.

In practical applications, the number of transparent layers used may be flexibly adjusted according to the gap value between the first display panel 11 and the second display panel 12. In order to fix the transparent layer, the transparent layer close to the first display panel 11 is attached to the first display panel 11 through a pressure sensitive adhesive layer, the transparent layer close to the second display panel 12 is attached to the second display panel 12 through a pressure sensitive adhesive layer, and other transparent layers in the middle position are attached to each other through a colloid material. Flatness and uniformity of the film can be ensured, and unevenness of subjective optical brightness can be avoided.

The first and second transparent layers 141 and 142 may be a prism sheet or a moth-eye film.

After the irregular prism film is disposed between the first display panel 11 and the second display panel 12 in the display device, since the irregular prism film can change the propagation direction of light rays to different directions, the occurrence of the phenomenon that light rays of different colors are refracted to the same direction can be destroyed, thereby preventing the generation of rainbow stripes and optimizing the display effect.

When two kinds of films, i.e., the irregular prism film and the moth-eye film, are simultaneously disposed between the first display panel 11 and the second display panel 12, rainbow unevenness can be reduced and light transmittance can be improved.

In practical applications, the first display panel 11 is used for controlling a backlight, and therefore, a liquid crystal display panel may be used, and an organic light emitting diode display panel may also be used, which is not limited herein. The second display panel 12 modulates the light provided by the first display panel 11 and emits the modulated light for image display, so that the second display panel 12 is a transmissive display panel, and may be a liquid crystal display panel, which is not limited herein.

Fig. 7 is a fourth schematic view of a cross-sectional structure of the display device according to the embodiment of the present invention, as shown in fig. 7, when the first display panel 11 and the second display panel 12 both adopt the liquid crystal display panel, the display device further includes a backlight module 15 located on one side of the first display panel 11 departing from the second display panel 12.

The backlight module 15 is used for emitting light to the first display panel 11 and the second display panel 12.

The first display panel 11 includes: the display panel comprises a first substrate 111 and a second substrate 112 which are oppositely arranged, a first pixel unit 113 which is positioned between the first substrate 111 and the second substrate 112, and a first polarizer 114 which is positioned on one side of the first substrate 111, which is far away from the first pixel unit 113.

The second display panel 12 includes: a third substrate 121 and a fourth substrate 122 opposite to each other, a second pixel unit 123 between the third substrate 121 and the fourth substrate 122, a second polarizer 124 on a side of the third substrate 121 facing away from the second pixel unit 123, and a third polarizer 125 on a side of the fourth substrate 122 facing away from the second pixel unit 123.

The polarization directions of the first polarizer 114 and the second polarizer 124 are perpendicular to each other, and the polarization directions of the second polarizer 124 and the third polarizer 125 are perpendicular to each other. The first display panel 11 and the second display panel 12 may share the second polarizer 124, thereby reducing the overall thickness.

The adhesive layer 13 is used for adhering the second substrate 112 and the second polarizer 124 together, so that the first display panel and the second display panel are attached to each other. The transparent layer 14 is located between the second substrate 112 and the second polarizer 124.

Fig. 8 is a fifth schematic view of a cross-sectional structure of a display device provided in an embodiment of the present invention, as shown in fig. 8, when the first display panel 11 adopts an organic light emitting diode display panel and the second display panel 12 adopts a liquid crystal display panel, a backlight module is not required to be additionally disposed, so that the thickness of the display device can be reduced.

The first display panel 11 includes: a substrate base 111 ' and an encapsulation cover 112 ' oppositely arranged, and a first pixel unit 113 ' located between the substrate base 111 ' and the encapsulation cover 112 '.

The second display panel 12 includes: the lower substrate 121 ' and the upper substrate 122 ' are oppositely disposed, the second pixel unit 123 ' is located between the lower substrate 121 ' and the upper substrate 122 ', the lower polarizer 124 ' is located on the side of the lower substrate 121 ' away from the second pixel unit 123 ', and the upper polarizer 125 ' is located on the side of the upper substrate 122 ' away from the second pixel unit 123 '. The polarization directions of the lower polarizer 124 'and the upper polarizer 125' are perpendicular to each other.

The adhesive layer 13 is used for adhering the package cover plate 112 'and the lower polarizer 124' together, so that the first display panel and the second display panel are attached to each other. The transparent layer 14 is located between the package cover 112 'and the lower polarizer 124'.

Each first pixel unit can correspond to at least one second pixel unit, so that the brightness of each first pixel unit in the first display panel can be controlled according to a display image, the first display panel can implement regional dimming for the second display panel, and the picture contrast is improved.

The embodiment of the utility model provides a display device, include: a first display panel for controlling a backlight; the second display panel is positioned on the light emergent side of the first display panel and used for displaying images; the adhesive layer is positioned at the edge positions of the first display panel and the second display panel and used for bonding the first display panel and the second display panel; and a transparent layer between the first display panel and the second display panel for filling a gap between the first display panel and the second display panel. Since the adhesive layer has a certain thickness, there is a certain gap between the first display panel and the second display panel after the adhesion, and a transparent layer is disposed at the gap for filling the gap, so that the first display panel and the second display panel can be supported. Therefore, the first display panel and the second display panel can be prevented from being deformed due to bending towards one side of the gap, the distance between the first display panel and the second display panel is kept unchanged, and the problem that the display device generates interference fringes is avoided.

While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A display device, comprising:

a first display panel for controlling a backlight;

2. The display device as claimed in claim 1, wherein the adhesive layer is one of an ultraviolet moisture curable adhesive, a two-liquid hybrid curing adhesive, or a moisture curable reactive polyurethane hot melt adhesive.

3. The display device according to claim 2, wherein the width of the adhesive layer is 0.5mm to 2.0 mm.

4. The display device of claim 2, wherein the adhesive layer has a thickness of 0.15mm to 0.4 mm.

5. The display device of claim 4, wherein the transparent layer has a thickness of 0.15mm to 0.35 mm.

6. The display device of claim 1, wherein the display device comprises a layer of the transparent layer; the transparent layer is adhered on the first display panel.

7. The display device of claim 1, wherein the display device comprises at least two transparent layers; the transparent layer adjacent to the first display panel is adhered on the first display panel, and the transparent layer adjacent to the second display panel is adhered on the second display panel.

8. The display device of claim 6 or 7, wherein the transparent layer comprises at least one of a prism sheet or a moth-eye film.

9. The display device of claim 2, wherein the adhesive layer has a bond strength greater than 2mpa, a 60 degree shear bond strength of 1mpa, and a tensile elongation greater than 150%.

10. The display device according to claim 1, wherein the first display panel is a liquid crystal display panel or an organic light emitting diode display panel;

the second display panel is a liquid crystal display panel.