CN100385292C - Double-sided liquid crystal display - Google Patents

Abstract

The invention discloses a double-sided liquid crystal display capable of displaying pictures on double sides, wherein a backlight source of the double-sided liquid crystal display is an organic light emitting diode module capable of emitting light on double sides. The organic light emitting diode module capable of emitting light from two sides is formed by staggered arrangement of a plurality of organic light emitting diodes emitting light upwards and a plurality of organic light emitting diodes emitting light downwards.

Description

Double-sided LCD display

technical field

The invention relates to a liquid crystal display, and in particular to a double-sided liquid crystal display capable of displaying pictures on both sides.

Background technique

Due to the diversification of functions of portable electronic products, the demand for a double-sided liquid crystal display (LCD) capable of displaying images on both sides is increasing. It is a common practice at present to combine two liquid crystal displays directly back to back, and then put them into portable electronic products. However, this method makes the double-sided liquid crystal display capable of displaying images on both sides very thick and heavy, so that the portable electronic product must sacrifice part of its lightness.

Organic light-emitting diodes (organic light-emitting diodes; OLEDs) have the advantages of self-luminescence, high response rate, low driving voltage, wide viewing angle, thinness, easy process and low cost, making them the mainstream of light-emitting devices for next-generation flat-panel displays. . It is known that organic light-emitting diodes have been used to replace the traditional backlight module using cold cathode fluorescent tube (cold cathode fluorescent tube) as the light source as the backlight source of the liquid crystal display, such as China Taiwan Patent No. 583466 patent, in order to reduce the thickness of the liquid crystal display with weight. However, in order to form a double-sided liquid crystal display capable of displaying images on both sides, it is still necessary to use two sets of organic light-emitting diode modules as backlight sources and combine them back-to-back to achieve the purpose of displaying images on both sides.

Contents of the invention

Therefore, the object of the present invention is to provide a double-sided liquid crystal display capable of displaying pictures on both sides, and reduce the number of backlight modules made of organic light emitting diodes from two to one. In this way, the thickness and weight of the double-sided liquid crystal display can be reduced, making it more suitable for use in portable electronic products.

According to a preferred embodiment of the present invention, an organic light emitting diode module can be formed on the same transparent substrate, and a plurality of organic light emitting diodes capable of emitting upward light and organic light emitting diodes capable of emitting downward light can be respectively formed on the transparent substrate by using photolithography etching technology , so that the above two are alternately arranged to form an organic light emitting diode module capable of emitting light on both sides. The organic light-emitting diode module capable of emitting light on both sides is sandwiched between two groups of liquid crystal displays, so that backlight can be provided to the two groups of liquid crystal displays at the same time.

Therefore, although only one organic light-emitting diode module is produced, it can be used as the backlight source of the double-sided liquid crystal display at the same time, so as to further reduce the thickness and weight of the double-sided liquid crystal display capable of displaying images on both sides, so that portable electronic products can maintain its lightweight properties.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

FIG. 1 shows a schematic cross-sectional structure diagram of an organic light emitting diode module according to a preferred embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a double-sided liquid crystal display capable of displaying images on both sides according to a preferred embodiment of the present invention.

Explanation of reference signs

100: OLED module 110: Transparent substrate

120: metal cathode 130: organic light-emitting layer

140: Transparent Anode 150a: Upward-emitting Organic Light-Emitting Diode

150b: Downward-emitting organic light-emitting diode 160: Transparent substrate

170: frame glue 200: double-sided liquid crystal display

210: Transparent substrate 220: Common electrode

230: Liquid crystal layer 240: Control substrate

250: Control substrate 260: Liquid crystal layer

270: Common electrode 280: Transparent substrate

300: the first LCD panel 400: the second LCD panel

Detailed ways

At present, the structure of the organic light emitting diode is composed of a multi-layer film stack, which includes a transparent anode (anode), an organic light emitting layer and a metal cathode (cathode). The above-mentioned organic light-emitting layer can be subdivided into hole injection layer (hole injection layer; HIL), hole transfer layer (hole transfer layer; HTL), light-emitting layer (emission layer; EML), electron transfer layer (electron transfer layer). layer (ETL) and electron injection layer (electron injection layer; EIL), wherein the hole injection layer is in contact with the transparent anode, and the electron injection layer is in contact with the metal cathode.

The light-emitting principle of organic light-emitting diodes is: apply a voltage to the transparent anode and the metal cathode, inject holes from the transparent anode, and inject electrons from the metal cathode; when electrons and holes meet in the light-emitting layer, molecules in the light-emitting layer will form In the excited state; when the molecules of the light-emitting layer return to the ground state from the excited state, energy will be released in the form of light.

Since the thickness of the metal cathode of the OLED generally needs to be more than 1500 angstroms to meet the requirements, the side of the metal cathode of the OLED cannot transmit light. Therefore, it is known that two liquid crystal displays with organic light emitting diodes as backlight sources must be manufactured first, and then the two liquid crystal displays can be combined back to back to form a double-sided liquid crystal display capable of displaying images on both sides.

Therefore, the present invention proposes a double-sided liquid crystal display capable of displaying images on both sides, which can reduce the number of backlight modules required by a double-sided liquid crystal display from two to one, and the backlight module is composed of a plurality of organic light emitting diodes. constitute. According to a preferred embodiment of the present invention, an organic light emitting diode module can be formed on the same transparent substrate, and a plurality of organic light emitting diodes capable of emitting upward light and organic light emitting diodes capable of emitting downward light can be respectively formed on the transparent substrate by using photolithography technology, Let the above two be arranged alternately. Therefore, although only one organic light emitting diode module is manufactured, the organic light emitting diode module can be used as the backlight module of the light source of the double-sided liquid crystal display at the same time, so as to further reduce the thickness and weight of the double-sided liquid crystal display capable of displaying pictures on both sides , so that portable electronic products maintain their lightweight characteristics.

Please refer to FIG. 1 , which shows a schematic cross-sectional structure diagram of an organic light emitting diode module according to a preferred embodiment of the present invention. On the transparent substrate 110, a plurality of upward emitting organic light emitting diodes 150a and a plurality of downward emitting organic light emitting diodes 150b are respectively formed to form a light source group. Then another transparent substrate 160 is used to cover the light source group, and the transparent substrate 110 and the transparent substrate 160 are glued together with a sealant 170 (see FIG. 2 ) to encapsulate the light source group to form a double-sided light emitting device. organic light emitting diode module 100.

The above-mentioned organic light emitting diodes 150 a emitting upward and the organic light emitting diodes 150 b emitting downward are arranged alternately with each other. The material of each layer of the upward emitting organic light emitting diode 150 a is the metal cathode 120 , the organic light emitting layer 130 and the transparent anode 140 in sequence from bottom to top. Materials of each layer of the down-emitting organic light emitting diode 150 b are the transparent anode 140 , the organic light emitting layer 130 and the metal cathode 120 in sequence from bottom to top. The luminescent material of the above-mentioned organic luminescent layer 130 can be, for example, a general organic luminescent material or a polymer luminescent material.

The above-mentioned up-emitting OLED 150 a and down-emitting OLED 150 b can be fabricated by any suitable known fabrication method. Since a person skilled in the art can easily determine which known manufacturing method is suitable for manufacturing the up-emitting OLED 150 a and the down-emitting OLED 150 b , the detailed description of the manufacturing method is omitted here.

Please refer to FIG. 2 , which shows a cross-sectional schematic diagram of a double-sided liquid crystal display capable of displaying images on both sides according to a preferred embodiment of the present invention. In FIG. 2 , a set of liquid crystal display panels are respectively manufactured on the lower surface of the transparent substrate 110 and the upper surface of the transparent substrate 160 of the organic light emitting diode module 100 capable of emitting light on both sides shown in FIG. 1 to form a double-sided display screen. double-sided liquid crystal display 200. Under the transparent substrate 110 are the control substrate 240 , the liquid crystal layer 230 , the common electrode 220 and the transparent substrate 210 in order, and the above-mentioned elements together constitute the first liquid crystal panel 300 . On the transparent substrate 160 are the control substrate 250 , the liquid crystal layer 260 , the common electrode 270 and the transparent substrate 280 in order, and the above-mentioned elements constitute the second liquid crystal panel 400 .

The color filter layer (not shown in the figure) of the first liquid crystal panel 300 can be located on the control substrate 240 or the transparent substrate 210 . Likewise, the color filter layer (not shown in the figure) of the second liquid crystal panel 400 can also be located on the control substrate 250 or the transparent substrate 280 . Since those skilled in the art are familiar with how to manufacture various known liquid crystal display panels, the manufacturing methods of the first liquid crystal panel 300 and the second liquid crystal panel 400 will not be repeated here.

It can be seen from the preferred embodiments of the present invention that the organic light emitting diodes emitting upward and the organic light emitting diodes emitting downward are alternately arranged to form a double-side emitting organic light emitting diode module. The organic light emitting diode module capable of emitting light on both sides is then used to be sandwiched between two groups of liquid crystal display panels as a backlight source. In this way, only one organic light emitting diode module can simultaneously provide the backlight required by two groups of liquid crystal display panels whose back faces are opposite to each other. Therefore, by applying the present invention, the thickness and weight of the liquid crystal display panel capable of displaying pictures on both sides can be greatly reduced, so that it is suitable for application in portable electronic products.

Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and modifications without departing from the spirit and scope of the present invention. , so the scope of protection of the present invention should be defined by the claims.

Claims (9)

1. double side liquid crystal display comprises:

First LCD MODULE;

First transparency carrier is positioned on described first LCD MODULE;

The Organic Light Emitting Diode module is positioned on described first transparency carrier, and described Organic Light Emitting Diode module has staggered a plurality of luminous Organic Light Emitting Diode and a plurality of downward luminous Organic Light Emitting Diodes of making progress on this first transparency carrier, one side; And

Second LCD MODULE is positioned on the described Organic Light Emitting Diode module.

2. double side liquid crystal display as claimed in claim 1 also comprises:

Second transparency carrier is between described Organic Light Emitting Diode module and described second LCD MODULE.

3. double side liquid crystal display as claimed in claim 2, wherein, each described luminous Organic Light Emitting Diode that makes progress comprises:

Metallic cathode is positioned on described first transparency carrier;

Organic luminous layer is positioned on the described metallic cathode; And

Transparent anode is positioned on the described organic luminous layer.

4. double side liquid crystal display as claimed in claim 2, wherein, each described downward luminous Organic Light Emitting Diode comprises:

Transparent anode is positioned on described first transparency carrier;

Organic luminous layer is positioned on the described transparent anode; And

Metallic cathode is positioned on the described organic luminous layer.

5. double side liquid crystal display comprises:

First transparency carrier;

First public electrode is positioned on described first transparency carrier;

First liquid crystal layer is positioned on the described public electrode;

First control basal plate is positioned on the described liquid crystal layer, and described first control basal plate has the first control circuit and first pixel electrode array;

Second transparency carrier is positioned on described first control basal plate;

The Organic Light Emitting Diode module, be positioned on described second transparency carrier, described Organic Light Emitting Diode module has staggered a plurality of luminous Organic Light Emitting Diode and a plurality of downward luminous Organic Light Emitting Diodes of making progress on described second transparency carrier, one side;

The 3rd transparency carrier is positioned on the described Organic Light Emitting Diode module;

Second control basal plate is positioned on described the 3rd transparency carrier, and described second control basal plate has the second control circuit and second pixel electrode array;

Second liquid crystal layer is positioned on described second control basal plate;

Second public electrode is positioned on described second liquid crystal layer; And

The 4th transparency carrier is positioned on described second public electrode.

6. double side liquid crystal display as claimed in claim 5, wherein, each luminous Organic Light Emitting Diode that makes progress comprises:

Metallic cathode is positioned on described second transparency carrier;

Organic luminous layer is positioned on the described metallic cathode; And

Transparent anode is positioned on the described organic luminous layer.

7. double side liquid crystal display as claimed in claim 5, wherein, each downward luminous Organic Light Emitting Diode comprises:

Transparent anode is positioned on described second transparency carrier;

Organic luminous layer is positioned on the described transparent anode; And

Metallic cathode is positioned on the described organic luminous layer.

8. double side liquid crystal display as claimed in claim 5, wherein, described first transparency carrier and described the 4th transparency carrier have chromatic filter layer respectively.

9. double side liquid crystal display as claimed in claim 5, wherein, described first control basal plate and described second control basal plate have chromatic filter layer respectively.

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