TWI786865B - Display module with dual touch function - Google Patents

Abstract

The invention provides a display module with dual touch function, which includes a touch panel and an abnormality detection unit. The touch panel contains a capacitance sensing element and a light sensing element. The abnormality detection unit is electrically connected to the capacitance sensing element and the light sensing element, and can switch the touch mode according to a detection value of the capacitance sensing element.

Description

Composite touch display module

The present invention relates to an input device, in particular to a display module with a touch function.

Organic light emitting diodes have been widely used in portable electronic devices, such as game consoles, mobile phones, PDAs, smart watches or smart bracelets.

According to the light output form of the organic light emitting diode display module, it can be roughly divided into upward light emission, downward light emission and full transmission light emission. In addition, organic light-emitting diode display modules with touch functions can be divided into resistive touch, capacitive touch, optical touch, etc. according to different sensing methods. Since the capacitive touch has the advantages of fast response time and long service life, most of the portable electronic products currently on the market adopt the capacitive touch design.

Although capacitive touch has the advantage of fast response time, it is also relatively susceptible to external environmental factors. For example, if water drops on the touch surface, it may cause capacitive touch. If the detection value exceeds the critical value, the touch function cannot work normally.

Therefore, how to provide a touch display module capable of performing touch operations under different environmental conditions is a technical problem to be solved by the present invention.

The main purpose of the present invention is to provide a composite touch display module, which can utilize the composite touch function, so that the composite touch display module can continue to use touch operations under different abnormal environmental conditions.

To achieve the aforementioned purpose, the present invention provides a composite touch display module, including: Touch panel, including: The display area is provided with passive organic light emitting diode display elements, and the passive organic light emitting diode display elements include: a first pixel electrode layer; a second pixel electrode layer; and an organic luminescent material layer formed between the first pixel electrode layer and the second pixel electrode layer; and The non-display area, surrounding the display area, is provided with two light-sensing touch elements; and An abnormality detection unit electrically connected to the passive organic light-emitting diode display element and the light-sensing touch element; Wherein, one of the first pixel electrode layer and the second pixel electrode layer can be used as a self-capacitance touch sensing element, and the abnormal detection unit is used to detect whether the detection value of the self-capacitance touch sensing element exceeds a critical value , to determine whether to switch to the light-sensing touch element.

In the above preferred embodiment, wherein the touch panel includes a substrate and a lower cover, the substrate has a first surface and a second surface opposite, the lower cover has a third surface and a fourth surface opposite, the second surface and the first surface The three surfaces are opposite, and the first pixel electrode layer, the organic luminescent material layer and the second pixel electrode layer are sequentially formed on the second surface.

In the above preferred implementation manner, the light-sensing touch element is formed on the second surface.

In the above preferred implementation manner, the photosensitive touch element includes a first photosensitive electrode layer, an organic photosensitive material layer and a second photosensitive electrode layer.

In the above-mentioned preferred embodiment, it further includes a polarizer disposed on the first surface.

In the above preferred embodiment, it further includes a circuit board, the abnormality detection unit is disposed on the circuit board, and the circuit board is electrically connected to the touch panel.

In the above preferred implementation manner, when the detected value exceeds the critical value, the light-sensing touch element detects whether an object touches the non-display area, and if so, outputs a second touch signal.

In the above preferred implementation manner, when the detected value does not exceed the critical value, the self-capacitance sensing touch element detects whether there is an object touching the display area, and if so, outputs the first touch signal.

The present invention further provides a composite touch display module, including: a touch panel, including: a display area, provided with a passive organic light-emitting diode display element; and a non-display area, surrounding the display area, provided with two light sensing type touch element; the capacitive touch sensing element is arranged on the touch panel; and the abnormal detection unit is electrically connected to the light sensing type touch element and the capacitive touch sensing element; wherein, the abnormal detection The unit is used for detecting whether the detection value of the capacitive touch sensing element exceeds a critical value, so as to judge whether to switch to the light sensing touch element.

In the above preferred embodiment, wherein the touch panel includes a substrate and a lower cover, the substrate has a first surface and a second surface opposite, the lower cover has a third surface and a fourth surface opposite, the second surface and the first surface The three surfaces are opposite, and the light-sensing touch element is formed on the second surface.

In the above preferred implementation manner, the photosensitive touch element includes a first photosensitive electrode layer, an organic photosensitive material layer and a second photosensitive electrode layer.

In the above preferred implementation manner, wherein the capacitive touch sensing element is disposed on the first surface.

In the above preferred implementation manner, it further includes a polarizer, and the polarizer is disposed on the capacitive touch sensing element.

In the above preferred implementation manner, it further includes a polarizer, and the polarizer is disposed between the capacitive touch sensing element and the substrate.

In the above-mentioned preferred implementation manner, it further includes an upper cover plate disposed above the substrate to cover the polarizer and the capacitive touch sensing element.

In the above preferred implementation manner, it further includes two optical glue layers, the optical glue layers are respectively formed between the polarizer and the capacitive touch sensing element and between the capacitive touch sensing element and the upper cover.

In the above preferred embodiment, it further includes a circuit board, the abnormality detection unit is disposed on the circuit board, and the circuit board is electrically connected to the touch panel.

In the above preferred implementation manner, when the detected value exceeds the critical value, the light-sensing touch element detects whether an object touches the non-display area, and if so, outputs a second touch signal.

In the above preferred implementation manner, when the detected value does not exceed the critical value, the capacitive touch sensing element detects whether an object touches the display area or the non-display area, and if so, outputs the first touch signal.

The beneficial effect of the present invention is that the provided composite touch display module is equipped with composite touch functions of light sensing type touch and capacitive touch sensing type, and can automatically perform touch mode according to different abnormal environmental conditions The switching of the touch screen allows users to continue to perform touch operations in different environments.

The advantages and features of the present invention and methods for attaining the same will be more easily understood by more detailed description with reference to exemplary embodiments and accompanying drawings. However, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, for those skilled in the art, these embodiments are provided to make this disclosure more thorough, complete and fully convey the scope of the present invention.

First, please refer to Figure 1A and Figure 1B, Figure 1A is a top view of the composite touch display module provided by the present invention; Figure 1B is a composite touch display module in Figure 1A, along A- The first embodiment of the schematic cross-sectional view of line A'. The composite touch display module 1 includes: a touch panel 10 , a polarizer 20 , a circuit board 80 and an abnormality detection unit 90 . The touch panel 10 has a display area DP and a non-display area ND surrounding the display area DP, which includes: a substrate 11, a passive organic light emitting diode display element 12, a light-sensing touch element 13 and a lower cover 14 , wherein the passive OLED display element 12 is located in the display area DP; the light-sensing touch element 13 is located in the non-display area ND. In this embodiment, the abnormality detection unit 90 is a microcontroller (Microcontroller Unit, MCU), and is disposed on the circuit board 80 , and the circuit board 80 is electrically connected to the touch panel 10 . The abnormality detection unit 90 controls and switches the operation of the passive OLED display element 12 and the light-sensing touch element 13 . In other possible implementation manners, the abnormality detection unit 90 may also be directly disposed in the non-display area ND of the touch panel 10 , and is not limited to the implementation manner proposed in this embodiment.

The substrate 11 has a first surface 111 and a second surface 112 opposite to each other; the lower cover 14 has a third surface 141 and a fourth surface 142 opposite to each other, and the second surface 112 is opposite to the third surface 141 . The polarizer 20 is disposed on the first surface 111, which is used to improve the directivity of the image light emitted by the passive organic light emitting diode display element 12 and the ambient light entering the touch panel 10 from the surrounding environment. .

The passive organic light emitting diode display element 12 is used for displaying images, which includes: a first pixel electrode layer 121, a second pixel electrode layer 122, and a pixel electrode layer formed between the first pixel electrode layer 121 and the second pixel electrode layer 122. The organic luminescent material layer 123, and the first pixel electrode layer 121, the organic luminescent material layer 123 and the second pixel electrode layer 122 are sequentially formed on the second surface 112 corresponding to the display area DP. Wherein, the first pixel electrode layer 121 includes a plurality of first pixel electrode series (not shown in the figure); the organic light-emitting material layer 123 includes a plurality of light-emitting material series (not shown in the figure); the second pixel The electrode layer 122 includes a plurality of second pixel electrode series (not shown in the figure), and the pixel electrode series and the luminescent material series can be separated by an insulating layer (not shown in the figure) and a barrier unit (not shown in the figure). In the figure) to form a plurality of pixel units, and the abnormal detection unit 90 can be electrically connected to the first pixel electrode layer 121 and the second pixel electrode layer 122 through a plurality of wires (not shown in the figure). Each pixel electrode is in series. The passive organic light-emitting diode display element 12 provided by the present invention is manufactured by a process known to those skilled in the art, so details will not be repeated here.

In this embodiment, the substrate 11 is a transparent substrate, and the first pixel electrode layer 121 is a transparent electrode layer, and the composite touch display module 1 emits light upward and displays. In another embodiment, both the substrate 11 and the lower cover 14 are transparent, and the first pixel electrode layer 121 and the second pixel electrode layer 122 are also transparent electrodes, so that the composite touch display module 1 is simultaneously facing Fully transparent display with top and bottom lights. The transparent electrode layer is made of transparent conductive oxide (Transparent Conductive Oxide, TCO), for example: indium tin oxide (Indium Tin Oxide, ITO), indium zinc oxide (Indium Zinc Oxide, IZO), zinc oxide (Zinc Oxide, ZnO ) or tin dioxide (SnO ₂ ).

On the other hand, the abnormality detection unit 90 can use one of the first pixel electrode layer 121 and the second pixel electrode layer 122 as a self-capacitance touch sensing element, so that the passive organic light emitting diode display element 12 At the same time, it has the functions of image display and touch control. The abnormal detection unit 90 can read the self-capacitance touch sensing element (ie, the first pixel electrode layer 121 or the second pixel electrode layer 122) to detect an object (such as a finger) on the touch display area DP. The polarizer 20 , or the change in self-capacitance generated when sliding on the polarizer 20 in the display area DP, and then output the first touch signal.

Please continue with Figure 1B. The photosensitive touch element 13 includes: a first photosensitive electrode layer 131, a second photosensitive electrode layer 132, and an organic photosensitive material layer 133 formed between the first photosensitive electrode layer 131 and the second photosensitive electrode layer 132, and The first photosensitive electrode layer 131 , the organic photosensitive material layer 133 and the second photosensitive electrode layer 132 are sequentially formed on the second surface 112 corresponding to the non-display area ND. On the other hand, the first photosensitive electrode layer 131 is a transparent electrode made of the same material as the first pixel electrode layer 121 , so that the organic photosensitive material layer 133 can receive ambient light incident from the direction of the substrate 11 . In another embodiment, both the substrate 11 and the lower cover 14 are transparent, and the first photosensitive electrode layer 131 and the second photosensitive electrode layer 132 are also transparent electrodes, so that the organic photosensitive material layer 133 can receive light from the direction of the substrate 11. , or ambient light incident from the direction of the lower cover plate 14 . It should be noted that, when manufacturing the touch panel 10, the layers of the passive organic light emitting diode display element 12 and the light-sensing touch element 13 can be formed at the same time, or the passive organic light emitting diode display element 12 can be formed successively. and the layer structure of the light-sensing touch element 13 .

On the other hand, the abnormality detection unit 90 can read the light-sensing touch element 13 when the detection object (for example: a finger) touches the non-display area ND or slides between the non-display areas ND, because the finger blocks The amount of change in the photoelectric conversion generated by the ambient light is used to output the second touch signal.

Please refer to FIG. 1B and FIG. 2 together. FIG. 2 is a flow chart of touch switching in the first embodiment of the composite touch display module of the present invention. Firstly, it is detected whether the detection value of the self-capacitance touch sensing element (ie, the first pixel electrode layer 121 or the second pixel electrode layer 122 ) exceeds a threshold value (step S100 ). In step S100, if the result is negative, it means that the user is using the composite touch display module 1 in a normal environment. Next, the self-capacitive touch sensor is used to detect whether an object touches the display area DP (step S101 ). In step S101, if the determination result is yes, output the first touch signal (step S102), the output first touch signal can be used to control the state of the image displayed on the display area DP; in step S101, if the determination result If no, return to step S100.

In step S100, if the result of the determination is yes, it means that the user may not use the composite touch display module 1 under normal environmental conditions, for example: there is water drop on the polarizer 20 of the display area DP, or When a user uses the composite touch display module 1 in water, such as a swimming pool, the detection value of the self-capacitive touch sensing element exceeds a critical value. At this time, the abnormality detection unit 90 performs touch switching, and uses the light-sensing touch element 13 to detect whether an object touches the non-display area ND (step S103 ). In step S103, if the determination result is yes, output a second touch signal (step S102). For example, the user can place a finger on the left non-display area ND, and the finger will block the ambient light so that the ambient light cannot enter the left non-display area ND. The element 13 will detect the decrease of the ambient light, and then output the second touch signal for moving the option to the left or sliding the screen to the left to control the state of the image displayed in the display area DP; When the non-display area ND slides to the right non-display area ND, a second touch signal for sliding the screen to the right can be output. In step S103, if the determination result is negative, the process returns to step S100.

Please refer to FIG. 3 . FIG. 3 is a second embodiment of a schematic cross-sectional view along line A-A' of the composite touch display module in FIG. 1A . The elements and functions in FIG. 3 are substantially the same as those in FIG. 1B , and will not be repeated here. The only difference is that the first pixel electrode layer 121 and the second pixel electrode layer of the passive organic light emitting diode display element 12 122 is not used as a self-capacitance sensing element, but a capacitive touch sensing element 30 is additionally disposed on the first surface 111 of the substrate 11 . The capacitive touch sensing element 30 is arranged in an on-cell form and covers both the display area DP and the non-display area ND, and the polarizer 20 is arranged on the capacitive touch sensing element 30 . The touch mode of the capacitive touch sensing element 30 can be: self-capacitive or mutual-capacitive.

Please refer to Figure 3 and Figure 4 together. FIG. 4 is a flow chart of touch switching in the second embodiment of the composite touch display module of the present invention. The steps in FIG. 4 are the same as those in FIG. 2, and will not be repeated here. The only difference is that since the capacitive touch sensing element 30 covers the display area DP and the non-display area ND, in step S101', It is determined whether to output the first touch signal by using the capacitive touch sensing element 30 to detect whether an object touches the display area DP or the non-display area ND (step S102 ′).

Please refer to FIG. 5 . FIG. 5 is a third embodiment of a schematic cross-sectional view along line A-A' of the composite touch display module in FIG. 1A . The components and functions in FIG. 5 are substantially the same as those in FIG. 3 , and will not be repeated here. The only difference is that this embodiment additionally includes an upper cover plate 40 , and the upper cover plate 40 is disposed above the substrate 11 . It is used to cover the polarizer 20 and the capacitive touch sensing element 30 , and the capacitive touch sensing element 30 is arranged in an out-cell form. The polarizer 20 is disposed on the substrate 11, the capacitive touch sensing element 30 is disposed on the polarizer 20, and an optical adhesive layer (OCA) G1 is formed between the polarizer 20 and the capacitive touch sensing element 30 , the optical adhesive layer G1 is used to bond the polarizer 20 and the capacitive touch sensing element 30 . In addition, another optical adhesive layer G2 is formed between the capacitive touch sensing element 30 and the upper cover 40 , and the optical adhesive layer G2 is used for bonding the capacitive touch sensing element 30 and the upper cover 40 . On the other hand, the touch switching flow chart of the third embodiment is the same as that of the second embodiment, and will not be repeated here.

Compared with the conventional technology, the composite touch display module provided by the present invention is equipped with composite touch functions of light sensing touch and capacitive touch sensing, and can automatically perform touch control according to different abnormal environmental conditions. The switch of the control mode allows the user to continue the touch operation in different abnormal environments; therefore, the present invention is a creation with great industrial value.

The present invention can be modified in various ways by those who are familiar with the art, but all of them will not break away from the intended protection of the appended patent scope.

DP: display area ND: non-display area G1, G2: optical glue layer S100~S104, S100’~S104’: steps 1: Composite touch display module 10: Touch panel 11: Substrate 111: first surface 112: second surface 12:Passive organic light-emitting diode display elements 121: the first pixel electrode layer 122: The second pixel electrode layer 123: organic luminescent material layer 13: Light-sensing touch element 131: the first photosensitive electrode layer 132: The second photosensitive electrode layer 133: organic photosensitive material layer 14: Lower cover 141: third surface 142: The fourth surface 20: Polarizer 30: Capacitive touch sensing element 40: Upper cover 80: circuit board 90:Anomaly detection unit

Figure 1A: is a top view of the composite touch display module provided by the present invention; Figure 1B: is the first implementation of the cross-sectional schematic diagram along the line AA' in the composite touch display module of Figure 1A example;

Fig. 2: It is the flow chart of touch switching of the first embodiment of the composite touch display module of the present invention;

Fig. 3: is the second embodiment of the cross-sectional schematic diagram along the A-A' line segment in the composite touch display module of Fig. 1A;

Fig. 4: It is the flow chart of the touch switching of the second embodiment of the composite touch display module of the present invention; and

Fig. 5: is the third embodiment of the schematic cross-sectional view along line A-A' of the composite touch display module in Fig. 1A.

DP: display area

ND: non-display area

1: Composite touch display module

10: Touch panel

11: Substrate

111: first surface

112: second surface

12:Passive organic light-emitting diode display elements

121: the first pixel electrode layer

122: The second pixel electrode layer

123: organic luminescent material layer

13: Light-sensing touch element

131: the first photosensitive electrode layer

132: The second photosensitive electrode layer

133: organic photosensitive material layer

14: Lower cover

141: third surface

142: The fourth surface

20: Polarizer

Claims (19)

A composite touch display module, comprising: a touch panel, including: a display area, provided with a passive organic light emitting diode display element, the passive organic light emitting diode display element including: a first pixel electrode layer ; a second pixel electrode layer; and an organic luminescent material layer formed between the first pixel electrode layer and the second pixel electrode layer; and a non-display area, surrounding the display area, provided with at least two photosensitive and an abnormal detection unit electrically connected to the passive organic light emitting diode display element and the at least two light-sensing touch elements; wherein, the first pixel electrode layer and the second pixel electrode layer One of the pixel electrode layers can be used as a self-capacitance touch sensing element, and the abnormal detection unit is used to detect whether a detection value of the self-capacitance touch sensing element exceeds a critical value, so as to determine whether to switch to The at least two light-sensing touch elements. The composite touch display module described in item 1 of the scope of the patent application, wherein the touch panel includes a substrate and a lower cover, the substrate has a first surface and a second surface opposite to each other, and the lower cover It has an opposite third surface and a fourth surface, the second surface is opposite to the third surface, and the first pixel electrode layer, the organic luminescent material layer and the second pixel electrode layer are sequentially formed on the first pixel electrode layer two surfaces. In the composite touch display module described in item 2 of the patent application, the at least two light-sensing touch elements are formed on the second surface. In the composite touch display module described in item 3 of the patent application, the at least two light-sensing touch elements include a first photosensitive electrode layer, an organic photosensitive material layer and a second photosensitive electrode layer. The composite touch display module described in item 2 of the scope of the patent application further includes a polarizer disposed on the first surface. The composite touch display module described in item 1 of the scope of the patent application further includes a circuit board, the abnormality detection unit is arranged on the circuit board, and the circuit board is electrically connected to the touch panel . The composite touch display module described in Item 1 of the scope of the patent application, wherein when the detection value exceeds a critical value, the at least two light-sensing touch elements detect whether an object touches the non-display area, and if Then output a second touch signal. The composite touch display module described in item 1 of the scope of the patent application, wherein when the detected value does not exceed a critical value, the self-capacitive touch sensing element detects whether an object touches the display area, and if so, Outputting a first touch signal. A composite touch display module, comprising: a touch panel, including: a display area, provided with a passive organic light emitting diode display element; and a non-display area, surrounding the display area, provided with at least two photosensitive a detection type touch element; a capacitive touch sensing element arranged on the touch panel; and an abnormality detection unit electrically connected to the at least two photosensitive touch elements and the capacitive touch sensor detection element; wherein, the abnormality detection unit is used to detect whether a detection value of the capacitive touch sensing element exceeds a critical value, so as to determine whether to switch to the at least two light-sensing touch elements. The composite touch display module described in item 9 of the scope of the patent application, wherein the touch panel includes a substrate and a lower cover, the substrate has a first surface and a second surface opposite to each other, the lower cover It has a third surface and a fourth surface opposite, the second surface is opposite to the third surface, and the at least two light-sensing touch elements are formed on the second surface. The composite touch display module described in claim 10 of the patent application, wherein the at least two light-sensing touch elements include a first photosensitive electrode layer, an organic photosensitive material layer and a second photosensitive electrode layer. In the composite touch display module described in item 10 of the scope of patent application, wherein the capacitive touch sensing element is disposed on the first surface. The composite touch display module described in item 12 of the scope of the patent application further includes a polarizer, and the polarizer is arranged on the capacitive touch sensing element. The composite touch display module described in item 12 of the scope of the patent application further includes a polarizer, and the polarizer is arranged between the capacitive touch sensing element and the substrate. The composite touch display module described in item 14 of the scope of the patent application further includes an upper cover plate disposed above the substrate to cover the polarizer and the capacitive touch sensing element. The composite touch display module described in item 15 of the scope of the patent application further includes two optical adhesive layers, and the two optical adhesive layers are respectively formed between the polarizer and the capacitive touch sensing element and the capacitor Between the touch sensing element and the upper cover. The composite touch display module described in item 9 of the scope of the patent application further includes a circuit board, the abnormality detection unit is arranged on the circuit board, and the circuit board is electrically connected to the touch panel . The composite touch display module described in item 9 of the scope of the patent application, wherein when the detection value exceeds a critical value, the at least two light-sensing touch elements detect whether there is an object touching the non-display area, and if Then output a second touch signal. The composite touch display module described in item 9 of the scope of the patent application, wherein when the detection value does not exceed a critical value, the capacitive touch sensing element detects whether an object touches the display area or the non-display area , if yes, output a first touch signal.

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