TWM567904U - Surface acoustic wave touch sensing organic light emitting diode display panel - Google Patents

Abstract

An organic light emitting diode display panel for surface acoustic wave touch sensing, comprising: a substrate comprising a first surface and a second surface opposite to each other; an organic light emitting diode unit disposed on the substrate And a touch sensing unit disposed on the second surface of the substrate, the touch sensing unit comprising: a plurality of first surface acoustic wave emitters emitting a surface propagating along a first direction And a plurality of first surface acoustic wave receivers respectively corresponding to the first surface acoustic wave transmitters in the first direction, thereby receiving surface acoustic wave signals from the first surface acoustic wave emitters.

Description

Surface acoustic wave touch sensing organic light emitting diode display panel

The present invention relates to an organic light emitting diode display panel, and more particularly to an organic light emitting diode display panel that performs touch sensing with a surface acoustic wave element.

Organic Light-Emitting Diode (OLED) display panel has become the most promising key technology in the display industry, mainly because of its self-luminous OLED as a pixel light source, thus having the advantages of high brightness and wide viewing angle. In addition, the low driving voltage of the OLED also makes the OLED display panel have the advantages of high power saving efficiency and fast reaction rate.

The OLED touch panel is an OLED display panel with touch function. Common touch methods are resistive, capacitive and sonic: resistive touch is to use two layers of conductive layer between the gaps, and use the pressure to make the upper and lower electrodes conduct to detect the voltage change on the screen. The position of the contact point is input; the capacitive touch is a capacitance change generated by the electrostatic combination between the arranged transparent electrode and the human body, and the coordinates are detected from the induced current generated; the acoustic touch is transmitted by using the electric signal The transducer is converted into an ultrasonic wave and directly transmitted through the surface of the touch panel. When the touch panel is used, the contact indicator absorbs the ultrasonic wave to cause attenuation, and the accurate amount is obtained by comparing the attenuation amount before and after the comparison. .

The three touch methods described in the prior art each have their own advantages and disadvantages, among which the acoustic touch The sound waves used in the control will have the disadvantages of being easily diverged and affected by ambient sound waves, and must be further integrated into the fabrication technology of the OLED display panel; therefore, it is necessary to develop new OLED display panel technology.

The present invention provides a surface acoustic wave touch sensing organic light emitting diode display panel, comprising: a substrate including a first surface and a second surface opposite to each other; an organic light emitting diode unit disposed on the substrate And the touch sensing unit is disposed on the second surface of the substrate, the touch sensing unit includes: a plurality of first surface acoustic wave emitters, emitting along a first direction a propagated surface acoustic wave signal; and a plurality of first surface acoustic wave receivers respectively corresponding to the first surface acoustic wave emitters in the first direction for receiving surface acoustic wave signals from the first surface acoustic wave emitters.

In an embodiment, the composition of the substrate is a transparent soft material.

In one embodiment, the touch sensing unit has a layered structure including: a buffer layer disposed on the substrate; a comb electrode disposed on the buffer layer; and a piezoelectric material layer, It is placed on the comb electrode.

In an embodiment, the touch sensing unit further includes: a plurality of second surface acoustic wave transmitters that emit surface acoustic wave signals propagating along a second direction; and a plurality of second surface acoustic wave receivers The second surface acoustic wave transmitter is respectively aligned in the two directions to receive the surface acoustic wave signal from the second surface acoustic wave transmitter.

In an embodiment, the second direction is orthogonal to the first direction.

10‧‧‧Substrate

20‧‧‧OLED unit

30‧‧‧buffer layer

40‧‧‧ comb electrode

50‧‧‧ Piezoelectric layer

100‧‧‧OLED display panel

200‧‧‧First surface acoustic wave transmitter

300‧‧‧Second Surface Acoustic Wave Transmitter

400‧‧‧First surface acoustic wave receiver

500‧‧‧Second Surface Acoustic Receiver

600‧‧‧ touch area

FIG. 1 is a cross-sectional structural view of an OLED display panel of the present embodiment.

2 is a plan layout of the surface acoustic wave touch sensing unit of the embodiment Figure.

In order to further understand and understand the features, purposes and functions of this creation, we will explain the implementation of this creation in detail with the schema. In all of the specification and the drawings, the same component numbers will be used to designate the same or similar components.

In the description of the various embodiments, when an element is described as "above/on" or "below/under" another element, it is meant to be directly or indirectly above or below the other element. , which may contain other elements set in between; the so-called "directly" means that no other intermediary elements are set in between. The descriptions of "Upper/Upper" or "Bottom/Lower" are based on the schema, but also include other possible direction changes. The so-called "first", "second", and "third" are used to describe different elements that are not limited by such predicates. For the convenience and clarity of the description, the thickness or size of each element in the drawings is expressed in an exaggerated or omitted or schematic manner, and the size of each element is not completely the actual size.

1 is a cross-sectional structural view of an OLED display panel 100 according to the present embodiment. The OLED touch panel 100 includes a substrate 10, an OLED unit 20, and a touch sensing unit. The substrate 10 can be a glass substrate, a sapphire substrate, or a flexible substrate of a transparent resin material, and has opposite upper and lower surfaces. If the substrate 10 is a soft material, the OLED touch panel of the embodiment can be made into a flexible display panel. . The OLED unit 20 is disposed on the lower surface of the substrate 10 and is a layered structure (not shown) including an anode layer, a hole transport layer, a light emitting layer, an electron transport layer and a cathode layer, and the light is emitted to the substrate 10 The upper surface is emitted. The touch sensing unit is disposed on the upper surface of the substrate 10 and is a surface acoustic wave type touch sensing unit. The planar layout of the substrate is as shown in FIG. 2 . The touch sensing unit is a layered structure, and includes a buffer layer 30, a comb electrode 40, and a piezoelectric material layer 50. The buffer layer 30 is disposed on the substrate 10, which may be alumina. (Al ₂ O ₃ ) film; the comb electrode 40 is disposed on the buffer layer 30; the piezoelectric material layer 50 covers the comb electrode 40 and the buffer layer 30, which may be a zinc oxide (ZnO) film .

Referring to FIG. 2 , the touch sensing unit includes a plurality of first surface acoustic wave emitters 200 and a plurality of first surface acoustic wave receivers 400 . The first surface acoustic wave emitters 200 can emit surface acoustic wave signals propagating along a first direction and propagate on the surface of the piezoelectric material layer 50. In this embodiment, the first direction is the X-axis lateral direction of the Cartesian coordinates. The first surface acoustic wave receivers 400 respectively correspond to the first surface acoustic wave transmitter 200 in the first direction, thereby receiving the lateral surface acoustic wave signals from the first surface acoustic wave transmitter 200. In the present embodiment, the comb electrodes 40 of the first surface acoustic wave emitters 200 are arranged in parallel on the substrate 10 at equal intervals along the Y-axis direction. The adjacent two lateral surface acoustic wave signals may define a touch area, which affects the piezoelectric effect of the piezoelectric material layer 50 when the finger or other contact object is located in the touch area 600, the first surface acoustic wave receiver The 400 can detect the sensing signal due to the strength or phase of different surface acoustic signals, and then determine the relative position of the touch area of the finger or other contact object according to the sensing signal.

The touch sensing unit can be designed as two-dimensional touch sensing as shown in FIG. 2 . In this embodiment, the touch sensing unit further includes a plurality of second surface acoustic wave transmitters 300 and a plurality of second surface acoustic wave receivers 500. The second surface acoustic wave emitters 300 can emit surface acoustic wave signals propagating along a second direction and propagate on the surface of the piezoelectric material layer 50. In this embodiment, the second direction is a Y-axis longitudinal direction of a rectangular coordinate and is orthogonal to the first direction. The second surface acoustic wave receivers 500 respectively correspond to the second surface acoustic wave transmitter 300 in the second direction, thereby receiving the longitudinal surface acoustic wave signals from the second surface acoustic wave transmitter 300. In the present embodiment, the comb electrodes 40 of the first surface acoustic wave emitters 200 are arranged in parallel on the substrate 10 at equal intervals along the Y-axis direction. The adjacent two longitudinal surface acoustic wave signals may define a touch area that affects the piezoelectric effect of the piezoelectric material layer 50 when the finger or other contact object is located in the touch area 600. The second surface acoustic wave receiver The 500 can detect the sensing signal due to the strength or phase of different surface acoustic signals, and then determine the relative position of the touch area of the finger or other contact object according to the sensing signal.

The above is only the preferred embodiment of the present invention, and the scope of the present creation cannot be limited. That is to say, the equal changes and modifications made by Dafan in accordance with the scope of application for patent creation will not lose the essence of this creation, nor will it deviate from the spirit and scope of this creation, so it should be regarded as the further implementation of this creation.

Claims (5)

An organic light emitting diode display panel for surface acoustic wave touch sensing, comprising: a substrate comprising a first surface and a second surface opposite to each other; an organic light emitting diode unit disposed on the substrate And a touch sensing unit disposed on the second surface of the substrate, the touch sensing unit comprising: a plurality of first surface acoustic wave emitters emitting a surface propagating along a first direction And a plurality of first surface acoustic wave receivers respectively corresponding to the first surface acoustic wave transmitters in the first direction, thereby receiving surface acoustic wave signals from the first surface acoustic wave emitters. The surface acoustic wave touch sensing organic light emitting diode display panel according to claim 1, wherein the substrate has a transparent soft material. The OLED display panel of the surface acoustic wave touch sensing method of claim 1, wherein the touch sensing unit has a layered structure, and includes: a buffer layer disposed on the substrate And a comb electrode disposed on the buffer layer; and a piezoelectric material layer disposed on the comb electrode. The surface acoustic wave touch sensing organic light emitting diode display panel of claim 1, wherein the touch sensing unit further comprises: a plurality of second surface acoustic wave emitters, transmitting along a second direction a propagated surface acoustic wave signal; and a plurality of second surface acoustic wave receivers respectively corresponding to the second surface acoustic wave emitters in the second direction for receiving surface acoustic wave signals from the second surface acoustic wave emitters. The surface acoustic wave touch sensing organic light emitting diode display panel of claim 4, wherein the second direction is orthogonal to the first direction.