TW201818537A - OLED display device - Google Patents

Abstract

The present disclosure relates to an OLED display device includes a first electrode layer, a light emitting layer, and a second electrode layer, each of which is sequentially formed. The second electrode layer forms an anode of the light emitting layer. The first electrode layer is used as a cathode of the light emitting layer, a touch sensing electrode of the OLED display device and a pressure sensing electrode. The OLED display device further comprises a third electrode layer, and the third electrode layer and the first electrode cooperates to constitute a pressure sensing assembly.

Description

OLED display device

The present invention relates to the field of display technology, and in particular, to an OLED display device.

Compared with Liquid Crystal Display (LCD), Organic Light-emitting Diode (OLED) displays have the advantages of self-emission, wide viewing angle, and fast response speed. In the field of mobile terminal applications, OLED displays have begun to replace traditional LCDs, and OLED display devices with integrated touch functions have become a research hotspot in the display field today. With the widespread application of pressure sensing functions in the field of mobile terminals, it is urgent to provide A touch display device with integrated pressure sensing function.

In view of the above, it is necessary to provide an OLED display device, in which the touch function and the pressure sensing function are integrated simultaneously.

An OLED display device includes a first electrode layer, a light-emitting layer, and a second electrode layer that are sequentially stacked, the second electrode layer forms an anode of the light-emitting layer, and the first electrode layer is reused as the light-emitting layer. The cathode, the touch sensing electrode and the pressure sensing electrode of the OLED display device; the OLED display device further includes a third electrode layer, and the first electrode layer and the third electrode layer constitute a pressure sensing module.

The invention multiplexes the cathode of the OLED display device into the cathode of the light-emitting layer, the touch sensing electrode and the pressure sensing electrode of the OLED display device at the same time.

Please refer to FIG. 1, which is an exploded view of an OLED display device 1 according to a first embodiment of the present invention. The OLED display device 1 includes a first substrate 11, a first electrode layer 12, a light-emitting layer 13, a second electrode layer 14, a thin film transistor (TFT) layer 15, a second substrate 16, and a first substrate.三 electrode layer 17. The light-emitting layer 13 includes a plurality of light-emitting units 130 distributed in an array. The second electrode layer 14 serves as an anode of the light-emitting layer 13 and includes a plurality of pixel electrodes 140 arranged in an array interval. Each light-emitting unit 130 and a picture The element electrodes 140 are provided correspondingly. Generally, the light-emitting layer 13 includes an electron injection layer, an electron transport layer, an organic light-emitting layer, a hole transport layer, and a hole injection layer (not shown) that are disposed in a stack. The electron injection layer is closer to the first electrode layer 12 The hole injection layer is closer to the second electrode layer 14. The first electrode layer 12 is reused as a cathode of the light emitting layer 13, a touch sensing electrode and a pressure sensing electrode of the OLED display device 1. The first electrode layer 12 and the third electrode layer 17 form a pressure sense. Test module. The first electrode layer 12 is a cathode of the light-emitting layer 13, and the second electrode layer 14 is an anode of the light-emitting layer 13. The thin film transistor layer 15 includes a plurality of TFTs (not shown), and each TFT is electrically connected to a pixel electrode 140 to provide a driving current to the pixel electrode 140. In this embodiment, the first electrode layer 12 is multiplexed into a cathode of the light-emitting layer 13, a touch sensing electrode and a pressure sensing electrode of the OLED display device 1 in a time-phased manner.

Each pixel electrode 140 is disposed corresponding to one light emitting unit 130. Please refer to FIG. 2 together. Each pixel electrode 140 and its corresponding light-emitting unit 130 constitute a pixel unit 150. The OLED display device 1 includes a plurality of pixel units 150. FIG. 2 is a schematic plan layout of the pixel unit 150. The plurality of pixel units 150 are arranged in an array along the first direction D1 and the second direction D2. In this embodiment, one pixel unit 150 includes three pixel electrodes 140, and the three pixel electrodes 140 respectively control the corresponding light emitting units 130 to emit light of three primary colors (R, G, B). In this embodiment, the first direction D1 is substantially perpendicular to the second direction D2.

Please refer to FIG. 3 together. FIG. 3 is a schematic plan layout view of the first electrode layer 12. The first electrode layer 12 includes a plurality of first electrodes 121 arranged in an array along a first direction D1 and a second direction D2. The distribution of the plurality of first electrodes 121 has a corresponding relationship with the distribution of the plurality of pixel units 150. In this embodiment, the length of each first electrode 121 in the first direction D1 is equivalent to the total span length of the N pixel units 150 in the first direction D1. Each first electrode 121 is in the second direction D2. The length L2 is equivalent to the length of one pixel unit 150 along the second direction D2. Each first electrode 121 is connected to the IC circuit 10 through a wire 123 to form a self-capacitive touch sensing electrode. Among them, N is a natural number. The value of N depends on the touch resolution of the OLED display device 1. The higher the touch resolution, the greater the distribution density of the first electrode 121, and the smaller the value of N. The value of N determines the area of one first electrode 121 and the distance P between the centers of two adjacent touch sensing electrodes. The larger N is, the larger the distance P is. In this embodiment, the value of N ranges from 40 to 60. The invention adopts a single-layer self-capacitive touch sensing technology. The IC circuit 10 electrically controls each first electrode 121 through a wire 123. When a conductor (such as a human body) is touched on the first substrate 11, The amount of charge on the first electrode 121 corresponding to the touch position changes and outputs an electric signal. The IC circuit 10 implements a touch sensing function according to the electric signal.

Please refer to FIG. 4, which is a schematic cross-sectional structure diagram of the OLED display device 1 in FIG. 1. In this embodiment, the third electrode layer 17 is a metal frame, that is, the middle frame of the OLED display device 1. An air gap 18 exists between the third electrode layer 17 and the second substrate 16. The first electrode layer 12 and the third electrode layer 17 cooperate with the air gap 18 to form a capacitive pressure sensing device 20 to implement a pressure sensing function. When the first substrate 11 is pressed, the structures on the third electrode layer 17, that is, the first substrate 11, the first electrode layer 12, the light-emitting layer 13, the second electrode layer 14, the thin-film transistor layer 15, and the second The substrates 16 are deformed toward the air gap 18, and the distance between the first electrode layer 12 and the third electrode layer 17 changes, so that the capacitance of the capacitor formed by the first electrode layer 12 and the third electrode layer 17 When the value changes, the pressure sensing device 20 performs pressure sensing according to the change in the capacitance value, and outputs a pressure sensing signal.

The position of the pressure sensing device 20 in the OLED display device 1 can be changed in various ways.

Please refer to FIG. 5, which is a schematic cross-sectional view of an OLED display device 2 according to a second embodiment of the present invention. The structure of the OLED display device 2 is basically the same as that of the OLED display device 1, and the difference is mainly that the position of the third electrode layer 17 is different. In this embodiment, the third electrode layer 17 does not borrow the middle frame of the OLED display device 2, but is a semiconductor transparent conductive film disposed between the first substrate 11 and the first electrode layer 12. The semiconductor The transparent conductive film may be indium tin oxide (ITO). The OLED display device 2 further includes an elastic insulating layer 19. The third electrode layer 17, the elastic insulating layer 19, and the first electrode layer 12 are sequentially stacked to form the pressure sensing device 20. When the first substrate 11 is pressed, the elastic insulating layer 19 is compressed and deformed, so that the capacitance value of the capacitor formed by the first electrode layer 12 and the third electrode layer 17 changes. The pressure sensing device 20 Perform pressure sensing according to the change of the capacitance value, and output a pressure sensing signal.

Please refer to FIG. 6, which is a schematic cross-sectional view of an OLED display device 3 according to a third embodiment of the present invention. The structure of the OLED display device 3 is basically the same as the structure of the OLED display device 2, and the difference is mainly in the positions of the third electrode layer 17 and the elastic insulating layer 19. The third electrode layer 17 also does not borrow the middle frame of the OLED display device 3, but is a transparent conductive metal oxide layer disposed between the thin film transistor layer 15 and the second substrate 16. The elastic insulating layer 19 is disposed between the thin film transistor layer 15 and the third electrode layer 17. The pressure sensing device 20 is composed of the first electrode layer 12, the elastic insulating layer 19 and the third electrode layer 17. When the first substrate 11 is pressed, the elastic insulating layer 19 is compressed and deformed, so that the capacitance value of the capacitor formed by the first electrode 121 and the third electrode layer 17 changes. The pressure sensing device 20 is based on The change in the capacitance value is used for pressure sensing, and a pressure sensing signal is output.

Alternatively, please refer to FIG. 7, which is a schematic diagram of a planar layout of the first electrode layer 12 of the OLED display device (not shown) according to the fourth to sixth embodiments of the present invention. The structure of the OLED display device of the fourth embodiment is basically the same as that of the OLED display device 1, and the difference is mainly that the structure of the first electrode layer 12 is different. The structure of the OLED display device of the fifth embodiment is basically the same as that of the OLED display device 2, and the difference is mainly that the structure of the first electrode layer 12 is different. The structure of the OLED display device of the sixth embodiment is basically the same as that of the OLED display device 3, and the difference is mainly that the structure of the first electrode layer 12 is different. The structure of the first electrode layer 12 in the OLED display devices of the fourth to sixth embodiments is the same. The structure of the first electrode layer 12 in the OLED display devices of the fourth to sixth embodiments will be described in detail below. For the convenience of explanation, the same components as those in the foregoing embodiments are denoted by the same reference numerals, and details are not described below.

In the OLED display devices of the fourth to sixth embodiments, the first electrode layer 12 further includes a plurality of second electrodes 122. The first electrode layer 12 is divided into a plurality of first electrodes 121 and a plurality of ones by physical partitioning. The second electrode 122, the plurality of first electrodes 121 serve as touch sensing electrodes and pressure sensing electrodes, and the plurality of second electrodes 122 serve as cathodes of the light emitting layer 13.

Specifically, the plurality of second electrodes 122 are disposed on the same layer as the plurality of first electrodes 121 and are formed of the same conductive material layer. Each of the second electrodes 122 has a long shape extending along the first direction D1. The plurality of second electrodes 122 are substantially parallel and arranged at intervals along the second direction D2. In the second direction D2, a first electrode 121 is sandwiched between every two adjacent second electrodes 122, that is, the plurality of second electrodes 122 and the plurality of first electrodes 121 are in the second direction D2. Alternately spaced. Each of the second electrodes 122 and each of the first electrodes 121 is provided insulated from each other.

Please refer to FIG. 2 and FIG. 7 together. The distribution of the first electrode layer 12 corresponds to the distribution of the pixel units 150. The total span length L3 of each first electrode 121 and the second electrode 122 adjacent to it in the second direction D2 in the second direction D2 and a pixel unit 150 on the second electrode layer 14 along the second direction D2 The length L of the first electrode 121 is equal to one third of the length L1 of each pixel unit 150 in the second direction D2. The length of each first electrode 121 in the first direction D1 is equivalent to the total span length of the N pixel units 150 on the second electrode layer 14 along the first direction D1. Accordingly, every adjacent N in the second direction D2 The first electrodes 121 are electrically connected by wires 123 to form a touch electrode 120 (as shown by a dashed box in FIG. 7). Each touch electrode 120 is connected to the IC circuit 10 by a wire 123. Where N is a natural number. In this embodiment, the value of N ranges from 40 to 60. The value of N depends on the touch resolution of the OLED display device 1. The higher the touch resolution, the greater the distribution density of the first electrode 121, and the smaller the value of N. The value of N determines the distribution area of one touch electrode 120 and the distance P between the centers of two adjacent touch sensing electrodes. The larger N is, the larger the distance P is.

In the OLED display devices of the fourth to sixth embodiments described above, by dividing the first electrode layer 12 by physical division, the display function of the OLED display device 1 can be realized simultaneously with the touch function (or pressure sensing function). Therefore, it is not necessary to sacrifice the working time of the display stage, and avoid the display effect being affected by the touch function (or the pressure sensing function). Specifically, the plurality of first electrodes 121 serve as a touch sensing electrode and a pressure sensing electrode by time-multiplexing. In the touch sensing stage, the plurality of first electrodes 121 serve as a self-capacitive touch. The sensing touch electrodes implement a touch sensing function; in the pressure sensing stage, the plurality of first electrodes 121 cooperate with the third electrode layer 17 to implement a pressure sensing function. The plurality of second electrodes 122 serve as cathodes of the light-emitting layer 13.

The preferred embodiments of the present invention have been described above, but once those with ordinary knowledge in the art have learned the basic creative concepts, they can make other changes and modifications to these embodiments. If these changes and amendments belong to the technical scope of the claims of the present invention, the present invention intends to include such changes and amendments.

1,2,3‧‧‧‧OLED display device

20‧‧‧Pressure sensing device

11‧‧‧ the first substrate

12‧‧‧first electrode layer

13‧‧‧Light-emitting layer

130‧‧‧light-emitting unit

14‧‧‧Second electrode layer

15‧‧‧ thin film transistor layer

16‧‧‧second substrate

17‧‧‧ third electrode layer

18‧‧‧ air gap

19‧‧‧ Elastic insulation layer

120‧‧‧Touch electrode

140‧‧‧pixel electrode

150‧‧‧ pixel unit

121‧‧‧first electrode

122‧‧‧Second electrode

123‧‧‧Wire

10‧‧‧IC circuit

FIG. 1 is an exploded view of an OLED display device according to a first embodiment of the present invention.

FIG. 2 is a schematic plan layout of a pixel unit.

FIG. 3 is a schematic plan layout view of the first electrode layer in FIG. 1.

FIG. 4 is a schematic cross-sectional view of the OLED display device in FIG. 1.

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

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

FIG. 7 is a schematic plan view of a first electrode layer of an OLED display device according to the fourth to sixth embodiments of the present invention.

no

Claims (10)

An OLED display device includes a first electrode layer, a light-emitting layer, and a second electrode layer that are sequentially stacked. The second electrode layer forms an anode of the light-emitting layer. The improvement is that the first electrode layer is reused. The cathode of the light emitting layer, the touch sensing electrode and the pressure sensing electrode of the OLED display device; the OLED display device further includes a third electrode layer, and the first electrode layer and the third electrode layer form a pressure sense Test module. The OLED display device according to claim 1, wherein the first electrode layer includes a plurality of first electrodes arranged in an array interval along the first direction and the second direction, and the plurality of first electrodes are time-multiplexed. The touch sensing electrodes and the pressure sensing electrodes of the OLED display device. The OLED display device according to claim 2, wherein the third electrode layer is a metal frame, the metal frame is disposed on a side of the second electrode layer away from the first electrode layer, and the metal frame and the first electrode layer An air gap exists between the two electrode layers, and the plurality of first electrodes, the air gap, and the third electrode layer constitute the pressure sensing module. The OLED display device according to claim 2, wherein the OLED display device further includes a first substrate and an elastic insulating layer, and the first substrate, the third electrode layer, and the elastic insulating layer are sequentially stacked on the first substrate. The electrode layer is far from one side of the second electrode layer, and the elastic insulating layer is closer to the first electrode layer; the plurality of first electrodes, the elastic insulating layer, and the third electrode layer constitute the pressure sensing module. The OLED display device according to claim 2, wherein the OLED display device further includes a first substrate and an elastic insulating layer, and the elastic insulating layer, the third electrode layer, and the first substrate are sequentially stacked on the second substrate. The electrode layer is far from one side of the first electrode layer, and the elastic insulating layer is closer to the second electrode layer; the first electrode layer, the elastic insulating layer, and the third electrode layer constitute the pressure sensing module. The OLED display device according to any one of claims 2 to 5, wherein the second electrode layer includes a plurality of pixel electrodes arranged in an array along the first direction and the second direction, and the light-emitting layer includes a plurality of pixel electrodes. Light-emitting unit, each pixel electrode is arranged corresponding to a light-emitting unit, and each pixel electrode and its corresponding light-emitting unit constitute a pixel unit; the length of each first electrode in the first direction is equal to N pixels. The total span length of the elementary unit in this first direction is comparable. The OLED display device according to claim 6, wherein the value range of N is a natural number greater than or equal to 40 and less than or equal to 60. The OLED display device according to claim 6, wherein the plurality of first electrodes are also time-multiplexed as cathodes of the light-emitting layer, and a total span length of each first electrode in the second direction and N pictures The total span length of the prime unit in the second direction is comparable. The OLED display device according to claim 6, wherein the first electrode layer further includes a plurality of second electrodes, and the plurality of second electrodes are disposed on the same layer and insulated from the plurality of first electrodes. The second electrodes are cathodes of the light-emitting layer; the plurality of first electrodes and the plurality of second electrodes are alternately arranged at intervals in the second direction. The OLED display device according to claim 9, wherein a total span length of each first electrode and a second electrode adjacent thereto in the second direction in the second direction and a pixel unit along the The lengths in the second direction are equivalent.