KR20070029007A - Double side oled display apparatus - Google Patents

Abstract

A dual side OLED(Organic Light Emitting Diode) display apparatus is provided to prevent an element and a panel from being damaged by forming protection spacers on each OLED display panel to cross with each other vertically. A dual side OLED display apparatus includes a couple of OLED display panels(150), and a protection spacer(165). The couple of OLED display panels(150) are installed to be opposite to each other, and are formed to display on both sides. The protection spacer(165) is formed on a non-light emitting region of an element region of each OLED display panel(150). The protection spacers of each panel are contacted with each other when an outer pressure exists. A forming direction of the protection spacer(165) formed on the element region of the OLED display panel(150) is different from that of the protection spacer of the opposite panel. The OLED display panel(150) is an active matrix OLED display panel. The non-light emitting region is a region for a driving element.

Description

Double-sided OLED display device {DOUBLE SIDE OLED DISPLAY APPARATUS}

Figure 1 shows an application example of a typical OLED display panel.

2 is an OLED display module structure applied to FIG.

3 is a structure of a conventional general OLED.

4 is a double-sided firewood structure combining a typical OLED display.

5 is a problem of the double-sided OLED display device according to FIG.

6 is a schematic view showing a typical active matrix (AM) type OLED display panel configuration.

7 is a view showing a partition structure of the embodiments of the present invention.

Figure 8 is a side view showing a coupling structure of one embodiment of the present invention.

9 is a conceptual view showing a partition structure of an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

140: AM OLED display panel 141: light emitting unit

142: non-light emitting unit 150: PM OLED display panel

151: light emitting unit 152: non-light emitting unit

153: partition wall 160: PM OLED display panel

161: light emitting unit 162: non-light emitting unit

163: bulkhead 165: protective bulkhead

170: first substrate 175: first element layer

178: first protective partition 180: second substrate

185: second element layer 188: second protective barrier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided OLED display device, in particular when the display portion of a pair of OLED displays is placed adjacently outward and then supported by an support to prevent contact between the elements of the pair of OLED display displays, the OLED display due to external pressure The present invention relates to a double-sided OLED display device in which protective barrier ribs are formed in each OLED display display element layer in an alternating manner so as to prevent contact between display elements and damage the display area.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes (CRTs). Such a flat panel display panel is based on a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic electroluminescence (EL). Organic light emitting diode (OLED) displays; and the like.

The organic electroluminescent device (hereinafter referred to as OLED) is an exciton in which electrons and holes are injected by injecting electrons and holes into the light emitting layer, respectively, from an electron injection electrode (cathode electrode) and a hole injection electrode (anode electrode). is an element that emits light when exiton falls from the excited state to the ground state.

Due to this principle, unlike LCD, which is conventionally used as a thin display device, it does not need a separate light source, and thus has the advantage of reducing the volume and weight of the device. Since the reaction speed is 1000 times faster than LCD, afterimage display is performed. As a result, it is emerging as a next-generation display device. Therefore, such OLED displays have been applied to small electronic products requiring high definition such as mobile communication terminals, personal digital assistants (PDAs), camcorders, and digital cameras. In addition, since the manufacturing process is relatively simple and the production cost is significantly lower than that of the existing LCD, it is expected that the LCD will be replaced by most display devices.

According to the size of these OLEDs, various driving methods are used. Typically, medium- and large-sized OLED displays have an active matrix driving method (AM method), and active matrix driving methods and passive (Passive) methods in small OLED displays. ) Matrix driving method (PM method) is used in combination.

Recently, the display unit of the mobile communication terminal is the field in which the most OLED displays are applied. Initially, a monochromatic display of PM type is used as an external sub display, and recently, a full-color AM display is used as an internal sub display as well as an external sub display. It is applied to.

1 illustrates OLED displays applied to a display unit of a mobile communication terminal, and shows OLED displays 15 and 20 respectively applied to the outside and the inside of the clamshell mobile communication terminal 10 as shown. That is, while the OLED display 15 and 20 are used as the sub display and the main display, respectively, on the outside and inside of the upper case of the terminal 10, the display parts are bonded to the outside in order to reduce the thickness thereof. This structure was designed to share the backlight while using the LCD as an external and internal display unit. When the OLED display is used as the external and internal display unit, the backlight is not required, and thus the thickness of the upper case is maintained while maintaining a much thinner upper case thickness. It is now possible to arrange display sections that operate.

FIG. 2 illustrates a module structure of an OLED display applied to FIG. 1, in which a display surface is exposed on a front surface thereof, and an element layer is formed on a rear surface thereof, and lines for controlling them are connected in the form of a flexible printed circuit board. Structure. The module is disposed so that the device layers face each other, and the support part is disposed at the edge portion such that the device layers do not contact each other. The device layer of each module is spaced apart by the support, and there is a problem that unnecessary space may be wasted for this purpose.

3 is a cross-sectional view showing the structure of a general OLED, and has a relatively simple structure as shown.

Looking at the structure in more detail, a transparent first electrode 31, an organic EL layer 32, and an opaque second electrode 33 are formed on the substrate 30 to be used as a display surface for emitting light, thereby emitting basic light. An element is comprised and the protective cap 40 in which the moisture absorbent 45 for protecting the organic EL layer 32 which is weak to moisture is formed is fixed by the adhesive agent.

Since the protective cap 40 merely serves to protect the device irrespective of the display function, a double-sided OLED display device may be realized by arranging a pair of display panels that form the remaining portions to face the portion where the elements are formed. Can be.

4 is a double-sided OLED display device formed as described above, and is applied to a clamshell model having different display units on both sides of a mobile communication terminal. As shown, the support unit 130 supports the display panel on which the first device layer 115 is mounted on the first substrate 110 and the display panel on which the second device layer 125 is mounted on the second substrate 120. It is configured to be spaced apart and supported. Therefore, each display part can act as a protective cap on the other side. In addition, in the case of OLED, it is not necessary to have a separate backlight, and thus, an advantage of having a smaller width than that of a double-sided display LCD can be obtained.

However, in this case, when physical pressure is applied to both sides of the display surface as shown in FIG. 5, the display layers are bent by external pressure and the device layers 115 and 125 of each display unit come into contact with each other (A). Easy to occur In particular, the smaller the length h of the support 130 supporting the display units, the more likely this problem occurs, and the larger the h, the thicker the overall thickness of the display portion. In fact, the length of h is only a few hundred micrometers, so this problem is quite serious.

If a predetermined blocking film may be further provided between the device layers 115 and 125, it is difficult to prevent a physical shock from being applied to the device layer, and physical contact between the device layer and the blocking film may cause problems. Can be.

FIG. 6 illustrates a driving circuit area in which the simple OLED is formed as a panel and the AM type OLED elements 140 shown in FIG. 142 and the light emitting region 141. Since the size of the driving circuit region 142 is large, the possibility of damage due to external pressure increases when a double-side OLED device is configured.

As described above, in the case of configuring a double-sided OLED display device in which a pair of conventional OLED display panels face each other, the display is bent by external pressure because the displays formed separately are fixed by a support formed at a boundary portion. The ground element regions may come into contact with each other to cause physical and electrical shocks, and thus there may be a problem in that a defective region does not emit light or a luminance is lowered.

In view of the above problems, the present invention allows a protective barrier to be formed in a non-emitting region of an OLED element or prepares a non-emissive region by changing a cell structure to form a protective barrier in a corresponding region. By forming the protection barriers formed in the OLED display panels disposed to face each other in a vertical direction, even if the device regions of each display panel come into contact with each other by pressure, the protection elements do not affect the actual elements or the driver parts. The purpose is to provide a double-sided OLED display device.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a double-sided OLED display device in which a double-sided display is performed by facing element regions of a plurality of organic light emitting diode (OLED) display panels. It is characterized in that a protective partition wall having a height greater than or equal to an element height is formed in the non-emission region of the element formation region.

The direction in which the protective barrier ribs formed in the device region of the OLED display panels is different from the protective barrier ribs of the facing panels is different from each other.

Hereinafter, a configuration and an operation according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

6 to 7 illustrate general OLED display panels and a modified structure for the present invention to describe an embodiment of the present invention.

6 illustrates a portion of the active matrix driving OLED display panel as described above. As shown in FIG. 6, since the non-light emitting region 142 occupies about half of the cell, a protective barrier may be formed using the region. Can be. In this case, the protective barrier is to protect the device layer from external impact, and serves as a kind of spacer. In particular, in a configuration in which device layers face each other, such as a double-sided OLED display device, a physical structure for preventing contact between device layers of both OLED displays by external pressure is formed in each device layer. That is, when external pressure is applied, only the physical structures (protective partitions) contact each other, thereby preventing actual device layers from contacting each other by pressure and distributing external pressure.

FIG. 7 shows a part of the passive matrix driven OLED display panel 150. FIG. 7A shows a general configuration. Most of the cells are light emitting regions 151. The remaining regions are non-light emitting regions, which are spaced apart cells formed with wirings. (152). In the non-light emitting region 152, a partition wall 153 may be formed to separate the cathode electrode. In the present invention, the partition wall 153 may be formed to be higher and wider than the conventional one, so that the partition wall 153 may be used as a protective partition wall. That is, in order to be used as a protective barrier, the barrier must be formed at least higher than the height of the element layer, must correspond to the protective barrier formed in the element layer of the adjacent opposing OLED display, and must withstand external pressure to form a wider width. There is no choice but to.

FIG. 7B illustrates a panel 160 in which the general PM OLED display panel structure as shown in FIG. 7A is changed, and the protective barrier wall 165 is formed to have a sufficient width. To this end, the size of the light emitting region 161 which occupies most of the cell is reduced, and thus, a protective barrier wall 165 is separately formed in the non-light emitting region 162 which is increased. The protective barrier 165 should naturally be higher than the barrier 163 separating the cathode electrode and have a thicker width.

As described above with reference to FIGS. 6 and 7, the protective partition wall protects the panel element from physical and electrical shock caused by physical distortion of the panel element and contact with the element layer of the opposing panel while distributing physical pressure throughout the panel. It is to play a role. To this end, the protective barrier may be formed across a plurality of cells or by connecting the entire non-light emitting region in a straight line, or may be separately formed for each cell. It can be formed anywhere.

However, when the protective barrier rib formed in the element side region of one panel and the protective barrier rib formed in the element side region of the opposing panel are formed in the same direction, the protective barrier ribs may effectively contact and distribute external pressure by physical pressure. Because the display panel must be designed to have the same pixel pitch (i.e. cell height or width) of each display panel or precise alignment when joining the two displays, the buffer zones caused by the protective barrier must be matched with each other within the tolerance range. Accuracy within several micrometers is required. Therefore, since such arrangement lowers productivity, it is preferable that the protective partitions of the opposing panels are designed to be in a vertical direction.

FIG. 8 is a cross-sectional view illustrating a case in which a double-sided OLED display device is formed by bonding OLED display panels having protective barrier ribs 178 and 188 designed in a direction perpendicular to each other.

As shown, the first protective barrier wall 178 formed on the first substrate 170 on which the first device layer 175 is formed and the second substrate 180 on which the second device layer 185 is formed are formed. The direction of the second protective partition 188 is formed to cross perpendicularly to each other.

FIG. 9 is a plan view showing the structures of the first and second barrier ribs 178 and 188. As shown in FIG. 9, the barrier ribs may be formed when external pressure is applied even without a precise alignment process. 178 and 188 are in contact with each other to protect the element layers formed under each. However, in this case, since the intersection point of the partitions 178 and 188 is narrowed, the physical strength of the protective partition must be sufficient.

As described above, the present invention allows to form a protective partition for protecting the device layer on the OLED display panel itself, and then implements a double-sided OLED display device by fixing these OLED display panels in the direction of the device layer. It is possible to prevent the physical / electrical damage due to contact between the liver. The protective barrier is a fine structure formed by the size of the cell, and since the protection of all the cells is very densely based on the overall panel size, effective distribution of pressure is possible and does not affect the device layer. That is, it is possible to effectively prevent panel breakage and damage to the device because the device protection effect and pressure dispersion effect are excellent compared to the case of simply forming a blocking agent or a barrier between the panels without the protective barrier, or properly spaced panels.

As described above, the double-sided OLED display device according to the present invention is to form a protective barrier in the non-emitting region of the OLED element portion, or to prepare a non-emitting region by changing the cell structure to form a protective barrier in the portion In addition, the protective barrier ribs formed on the OLED display panels disposed to face each other are vertically intersected, thereby effectively dispersing external pressure, and the element region side of each display panel contacts each other by the pressure. Even though the protective barrier ribs are not subjected to physical and electrical shocks to the actual elements or the driving parts, damage to the devices is prevented and panel damage is prevented.

Claims (4)

A double-sided OLED display device in which a pair of organic light emitting diode (OLED) display panels are arranged to face each other by disposing element regions facing each other. A protective barrier formed in the non-emission area of the device-side area of each OLED display panel to have a height greater than or equal to the device height; The protective barrier ribs of each panel are in contact with each other when there is an external pressure. The double-sided OLED display device of claim 1, wherein a direction in which the protective barrier ribs formed in the device region of the OLED display panels are formed is different from that of the opposing panel. The double-sided OLED display device according to claim 1, wherein the OLED display panel is an active matrix drive OLED display panel, and a non-light emitting area in which the protective barrier is formed is an area in which an element for driving is formed. The OLED display panel of claim 1, wherein the OLED display panel is a passive matrix driven OLED display panel, and the protective partition wall is used by extending the height and width of the existing partition wall for separating the cathode electrode, or higher and thicker than the partition wall in addition to the partition wall. A double-sided OLED display device, characterized in that to form a separate protective barrier.

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