WO2020147184A1

WO2020147184A1 - Double-sided display panel and display device thereof

Info

Publication number: WO2020147184A1
Application number: PCT/CN2019/077998
Authority: WO
Inventors: 陈江川
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-01-18
Filing date: 2019-03-13
Publication date: 2020-07-23
Also published as: CN109860247A

Abstract

The present invention provides a double-sided display panel and a display device thereof. The double-sided display panel comprises a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode sequentially stacked from bottom to top. The first electrode, the first light-emitting layer, and the second electrode are connected to a drive circuit so that the first light-emitting layer emits light. The second electrode, the second light-emitting layer, and the third electrode are connected to the drive circuit so that the second light-emitting layer emits light. The display device comprises the double-sided display panel. The second light-emitting layer and the first light-emitting layer are provided facing away from each other so that two panels are not required to be connected, the effect of displaying a same image at both sides is achieved, and the entire thickness of a display is reduced. An alternating current is directly utilized without being converted into a direct current for utilization so as to be more energy-efficient and increase the feasibility of mass production of double-sided display products.

Description

Double-sided display panel and display device thereof

Technical field

The present invention relates to the field of display technology, in particular to a double-sided display panel and a display device thereof.

Background technique

With the advancement of display technology and changes in the public's aesthetics, narrow bezels and no bezels have received more and more attention. In order to ensure that the proportion of non-display screens is minimized, a double-sided display OLED design has appeared.

Regarding the current double-sided display OLED products, most of the double-sided display effects are produced by overlapping the front and back of two panels. This method is not only difficult to reduce the overall thickness of the display, but also because it is spliced, it has problems such as extremely high defect rate and difficult processing, and it is difficult to realize mass production.

technical problem

Based on this, the present invention provides a double-sided display panel and a display device thereof, which can achieve the effect of displaying the same screen on both sides without overlapping two panels, reduce the overall thickness of the display, and increase the mass production of double-sided display products. feasibility.

Technical solution

In order to solve the above-mentioned problems, an embodiment of the present invention provides a double-sided display panel, which includes a first electrode, a first light-emitting layer, a second electrode, a second light-emitting layer, and a third electrode that are sequentially stacked from bottom to top. The cathode of the first light emitting diode in the first light emitting layer is electrically connected to the first electrode; the second electrode is electrically connected to the anode of the first light emitting diode in the first light emitting layer; the second light emitting diode in the second light emitting layer The anode is electrically connected to the second electrode; the third electrode is electrically connected to the cathode of the second light-emitting diode of the second light-emitting layer; the first electrode, the first light-emitting layer and the second electrode are connected to the drive circuit to achieve all The first light-emitting layer emits light; the second electrode, the second light-emitting layer, and the third electrode are connected to the driving circuit to realize the second light-emitting layer to emit light. This arrangement does not require overlapping of two panels, realizes the effect of displaying the same picture on both sides, and reduces the overall thickness of the display.

Further, the third electrode is electrically connected to the first electrode, the electrically connected first electrode and the third electrode are connected to an output terminal of a driving circuit, and the second electrode is connected to the driving circuit The other output terminal of, so as to realize the use of the same drive circuit for driving.

Further, the driving circuit is an AC driving circuit, and the first light-emitting layer and the second light-emitting layer emit light simultaneously according to the conversion frequency of the AC driving circuit. In this way, there is no need to convert alternating current to direct current for use, and direct connection to use of alternating current is realized, which is more energy-saving.

Since the first light-emitting diode of the first light-emitting layer and the second light-emitting diode of the second light-emitting layer are reversed, when the driving circuit connected to the second electrode is positive, the second electrode is the anode of the first light-emitting layer, and the first electrode It is the cathode of the first light-emitting layer, and the first light-emitting layer emits light. At this time, the display screen can be seen from the front of the first light-emitting layer, and the second light-emitting diode of the second light-emitting layer on the back is in the off state and does not emit light, so there is no screen on the back; Conversely, when the driving circuit connected to the second electrode is under negative voltage, the third electrode is the anode of the second light-emitting layer, the second electrode is the cathode of the second light-emitting layer, the second light-emitting layer conducts light, and the back of the second light-emitting layer The first light-emitting diode of the first light-emitting layer is reversed and is in the off state. At this time, there is no picture on the back of the second light-emitting layer. When the inversion frequency of the AC drive circuit of the drive circuit and the picture refresh rate reach a certain level, the effect that the picture can be displayed on both the front and back sides can be achieved without being noticed by the human eye.

Further, wherein the second electrode is a metal electrode, and the metal electrode can reflect light from the first light-emitting layer and the second light-emitting layer.

Further, wherein the first electrode and the third electrode are both transparent electrodes. The transparent electrode can effectively transmit light to prevent shading from causing low display brightness.

Further, an upper polarizer is provided on the side of the third electrode away from the second electrode.

Further, a lower polarizer is provided on the side of the first electrode away from the second electrode.

Further, an upper color filter is provided on the side of the third electrode away from the second electrode.

Further, a lower color filter is provided on the side of the first electrode away from the second electrode.

In yet another embodiment of the present invention, a display device is provided, including the double-sided display panel described in any one of the above.

Beneficial effect

The technical effect of the present invention is to provide a double-sided display panel and a display device thereof. With two first light-emitting layers and second light-emitting layers arranged opposite to each other, on the one hand, there is no need for two panels to be overlapped to achieve the same double-sided display. The screen effect reduces the overall thickness of the display. On the other hand, there is no need to convert AC power to DC power for utilization, which enables direct connection and utilization of AC power, which is more energy-efficient, thereby improving the feasibility of mass production of double-sided display products.

BRIEF DESCRIPTION

1 is a schematic diagram of the structure of a double-sided display panel according to the first embodiment of the present invention;

2 is a schematic diagram of a pixel circuit structure of a double-sided display panel according to a second embodiment of the present invention;

3 is a schematic diagram of the structure of a double-sided display panel according to a third embodiment of the present invention;

4 is a schematic structural diagram of a double-sided display panel according to the first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a double-sided display panel according to a third embodiment of the present invention.

The components in the figure are identified as follows:

1 first electrode, 2 first light emitting layer, 3 second electrode, 4 second light emitting layer, 5 third electrode,

6 upper polarizers, 7 lower polarizers, 8 upper color filters, 9 lower color filters,

10 first connection end, 20 second connection end, 30 third connection end,

21 first light emitting diode, 41 second light emitting diode.

Embodiments of the invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, such as [Up], [Down], [Front], [Back], [Left], [Right], [Inner], [Outer], [Side], etc., are for reference only The direction of the additional schema. Therefore, the directional terminology is used to illustrate and understand the present invention, not to limit the present invention. In the figure, units with similar structures are indicated by the same reference numerals.

As shown in FIG. 1, an embodiment of the present invention provides a double-sided display panel, which includes a first electrode 1, a first light-emitting layer 2, a second electrode 3, and a second light-emitting layer 4 that are sequentially stacked from bottom to top. And the third electrode 5. The cathode of the first light emitting diode 21 in the first light emitting layer 2 is electrically connected to the first electrode 1; the second electrode 3 is electrically connected to the anode of the first light emitting diode 21 of the first light emitting layer 2; and the second light emitting layer The anode of the second light emitting diode 41 in 4 is electrically connected to the second electrode 3; the third electrode 5 is electrically connected to the cathode of the second light emitting diode 41 of the second light emitting layer 4; the first electrode 1, the first The light-emitting layer 2 and the second electrode 3 are connected to the driving circuit to realize the first light-emitting layer 2 to emit light; the second electrode 3, the second light-emitting layer 4 and the third electrode 5 are connected to the driving circuit to realize the second The light emitting layer 4 emits light. This arrangement does not require overlapping of two panels, realizes the effect of displaying the same picture on both sides, and reduces the overall thickness of the display. Please refer to the arrow direction shown in FIG. 1 for the direction of light emitted by the two first light-emitting layer 2 and the second light-emitting layer 4 which are arranged opposite to each other.

The third electrode 5 is electrically connected to the first electrode 1, wherein the electrically connected first electrode 1 and the third electrode 5 are connected to an output terminal of a driving circuit, and the second electrode 3 is connected to the The other output terminal of the driving circuit, so as to realize the use of the same driving circuit for driving. The third electrode 5 is electrically connected to the first electrode 1 by welding, or through an opening penetrating through the second electrode 3. The opening is located at the gap between the first electrode 1, the second electrode 3, and the third electrode 5 after patterning. The patterning method includes a high-precision metal mask (fine metal mask). , FMM) evaporation process, printing or transfer and other methods.

The driving circuit is an AC driving circuit, and the first light-emitting layer 2 and the second light-emitting layer 4 emit light simultaneously according to the conversion frequency of the AC driving circuit. In this way, there is no need to convert alternating current to direct current for use, and direct connection to use of alternating current is realized, which is more energy-saving.

The second electrode 3 is a metal electrode, and the metal electrode can reflect light from the first light-emitting layer 2 and the second light-emitting layer 4.

The first electrode 1 and the third electrode 5 are both transparent electrodes. The transparent electrode can effectively transmit light to prevent shading from causing low display brightness.

Please refer to FIG. 2, which is a schematic diagram of a pixel circuit structure of a double-sided display panel, which includes a first connection terminal 10, a second connection terminal 20, and a third connection terminal 30. The first connection terminal 10 is connected to the ground voltage (Vss) and connected to the second electrode 3; the second connection terminal 20 is connected to the power supply voltage (Voltage Drain Drain, Vdd), and the first connection terminal 10 and the second connection terminal 20 are connected The first light-emitting layer 2 and the second light-emitting layer 4, and the first connecting terminal 10 connects the anode of the first light-emitting diode 21 of the first light-emitting layer 2 and the second light-emitting diode 41 of the second light-emitting layer 4 Anode; the third connection terminal 30 is connected to external input data for controlling the second light-emitting layer 4 and the first light-emitting layer 2.

Since the connecting ends of the first light-emitting diode 21 of the first light-emitting layer 2 and the second light-emitting diode 41 of the second light-emitting layer 4 and the second electrode 3 are both positive, when the on-drive circuit is an AC drive circuit, The first light-emitting layer and the second light-emitting layer emit light simultaneously according to the conversion frequency of the AC drive circuit. When the inversion frequency of the AC drive circuit of the drive circuit and the picture refresh rate reach a certain level, the effect that the front and back sides of the display panel can display pictures at the same time can be achieved without being noticed by human eyes.

Please refer to FIG. 3, where an upper polarizer 6 is provided on the side of the third electrode 5 away from the second electrode 3; and an upper polarizer 6 is provided on the side of the first electrode 1 away from the second electrode 3. There is a lower polarizer 7.

Please refer to FIG. 4, where an upper color filter 8 is provided on the side of the third electrode 5 away from the second electrode 3; on the side of the first electrode 1 away from the second electrode 3 There is a lower color filter 9 on the side, so as to achieve the effect of displaying the same picture on both sides at the same time.

Please refer to FIG. 5, the upper color filter 8 and the lower color filter 9 can also have a polarizing function, so that the upper polarizer 6 and the lower polarizer 7 do not need to be separately provided.

The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as This is the protection scope of the present invention.

Claims

A double-sided display panel, which includes stacked layers from bottom to top

A first electrode;

A first light emitting layer in which the cathode of the first light emitting diode is electrically connected to the first electrode;

A second electrode electrically connected to the anode of the first light emitting diode of the first light emitting layer;

A second light-emitting layer, in which the anode of the second light-emitting diode is electrically connected to the second electrode;

A third electrode electrically connected to the cathode of the second light emitting diode of the second light emitting layer;

Wherein, the first electrode, the first light-emitting layer and the second electrode can realize the light emission of the first light-emitting layer after being energized; the second electrode, the second light-emitting layer and the third electrode can realize the second light emission after being energized. The light-emitting layer emits light.
3. The double-sided display panel of claim 1, wherein the third electrode is electrically connected to the first electrode, and the electrically connected first electrode and the third electrode are connected to an output terminal of a driving circuit, The second electrode is connected to the other output terminal of the driving circuit.
3. The double-sided display panel according to claim 2, wherein the driving circuit is an AC driving circuit, and the first light emitting layer and the second light emitting layer emit light simultaneously according to the conversion frequency of the AC driving circuit.
The double-sided display panel of claim 1, wherein the second electrode is a metal electrode, and the metal electrode can reflect light from the first light-emitting layer and the second light-emitting layer.
The double-sided display panel of claim 1, wherein the first electrode and the third electrode are both transparent electrodes.
The double-sided display panel according to claim 1, wherein an upper polarizer is provided on a side of the third electrode away from the second electrode.
The double-sided display panel according to claim 1, wherein a lower polarizer is provided on a side of the first electrode away from the second electrode.
The double-sided display panel of claim 1, wherein an upper color filter is provided on a side of the third electrode away from the second electrode.
2. The double-sided display panel of claim 1, wherein a lower color filter is provided on a side of the first electrode away from the second electrode.
A display device comprising the double-sided display panel according to claim 1.