Patent Application
20120113050
This application claims the priority benefit of Taiwan application serial no. 99138540, filed on Nov. 9, 2010. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
1. Field of the Invention
The invention generally relates to a touch display panel, and more particularly, to a touch display panel using an organic light emitting layer to perform displaying.
2. Description of Related Art
In recent years, the information technology, the wireless mobile communication, and the information household appliances have been rapidly developed in various applications. In order to achieve the objective of features with more-convenient usage, more-compact volume, and more-human friendly design, the inputting device in many information products has been changed from the traditional keyboard or mouse to a touch display panel already. Among the general designs of touch display panels currently, in terms of the design principle of touch sensing mode, it is roughly categorized into restive type, capacitive type, optical type, acoustic type, and electromagnetic type, wherein the restive type and the capacitive type have played a major role in the touch display panel market.
A conventional touch display panel today is manufactured by respectively fabricating the touch panel and the display panel thereof, and assembling up the above-mentioned touch panel with the display panel. The above-mentioned process method for manufacturing the touch display panel has disadvantages of higher cost, more heavy, and lower optical transmittance, which need to be overcome.
Accordingly, the invention is directed to a touch display panel, wherein an organic light emitting layer provides displaying function, and a touch sensing structure and a display pixel array are integrated between two substrates so that the volume of the touch display panel is decreased.
The invention provides a touch display panel, which includes a first substrate, a second substrate, a touch sensing structure, an organic light emitting diode (OLED) pixel array, and a sealant. The first substrate is opposite to the second substrate. The touch sensing structure is disposed on the first substrate and located between the first substrate and the second substrate. The sealant is disposed between the first substrate and the second substrate and seals the OLED pixel array between the first substrate and the second substrate. The OLED pixel array includes a plurality of OLED pixel units and an isolation structure. Each of the OLED pixel units includes a first electrode, an organic light emitting layer, a second electrode, an active device, and a conductive component. The first electrode, the organic light emitting layer, and the second electrode are sequentially disposed on the first substrate, and the isolation structure isolates at least the organic light emitting layers of adjacent OLED pixel units from each other. The active device is disposed on the second substrate. The conductive component connects the active device to the first electrode.
Based on the depiction above, the invention takes a design that the touch sensing structure is disposed on the substrate where the OLED pixel arrays are packaged so as to constitute a touch display panel. In this way, no extra substrate is used except the two substrates sealing the OLED pixel array, which is helpful to reduce the thickness of the touch display panel.
Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
It should be noted that the OLED pixel array 150 includes a plurality of OLED pixel units 152 and an isolation structure 154. Each of the OLED pixel units 152 includes a first electrode 10, an organic light emitting layer 20, a second electrode 30, an active device 40, and a conductive component 50. Usually, the active device 40 can include a gate G, a channel layer C, a source S, and a drain D, and an insulation layer I1 can be disposed between the gate G and the channel layer C while another insulation layer I2 can cover the source S and the drain D.
In the embodiment, the first electrode 10, the organic light emitting layer 20, and the second electrode 30 are sequentially disposed on the first substrate 110, and the isolation structure 154 isolates at least the organic light emitting layers 20 of the adjacent OLED pixel units 152 from each other. In addition, the active device 40 is disposed on the second substrate 120 and the conductive component 50 is disposed between the active device 40 and the first electrode 10 so as to electrically connect the active device 40 to the first electrode 10. It should be noted that so-called ‘sequentially disposed’ in the embodiment is not limited to ‘sequentially disposed from the first substrate 110 to the second substrate 120’ or ‘sequentially disposed from the second substrate 120 to the first substrate 110’. Hence, the disposing sequence shown by
The stacked structure of the first electrode 10, the organic light emitting layer 20, and the second electrode 30 and the active device 40 are respectively disposed on the first substrate 110 and the second substrate 120, so that the stacked structure of the first electrode 10, the organic light emitting layer 20, and the second electrode 30 is opposite to the active device 40 in the embodiment; and furthermore, a conductive component 50 is needed to electrically connect the first electrode 10 to the active device 40. In the embodiment, the organic light emitting layer 20 and the active device 40 are fabricated respectively on the different substrates (110 and 120), which can reduce the mutual influence between the production yield of the organic light emitting layer 20 and the production yield of the active device 40.
For example, if the organic light emitting layer 20 and the active device 40 are fabricated on a same substrate, when the production yield of the active device 40 is significantly higher than the production yield of the organic light emitting layer 20, it is possible that a poor organic light emitting layer 20 is disposed on a good active device 40. As a result, the whole substrate disposed by such device must be discarded, the good active device 40 can not be utilized and the fabrication cost is increased. In order to avoid the above-mentioned problem, in the embodiment, the structure stacked by the first electrode 10, the organic light emitting layer 20, and the second electrode 30 and the active device 40 are respectively disposed on the first substrate 110 and the second substrate 120, which is helpful to keep good production yield and avoid unnecessary cost.
The touch sensing structure 130 includes a plurality of first sensing series 132 and a plurality of second sensing series 134. The first sensing series 132 are, for example, electrically insulated from the second sensing series 134, and a first extension direction D1 of each first sensing series 132 is different from a second extension direction D2 of each second sensing series 134. Each of the first sensing series 132 includes a plurality of first sensing pads S1 and a plurality of first conductive lines B1, wherein the first conductive lines B1 connect in series the first sensing pads S1 along the first extension direction D1. Each of the second sensing series 134 includes a plurality of second sensing pads S2 and a plurality of second conductive lines B2, wherein the second conductive lines B2 connect in series the second sensing pads S2 along the second extension direction D2. In order to keep the electrical performance of each component, the touch sensing structure 130 further includes an insulation pattern 136 disposed between the first conductive lines B1 and the second conductive lines B2. It can be seen from
In summary, in the invention, the touch sensing structure is disposed on the substrate used to package the OLED pixel array. Hence, the touch display panel does not need an extra substrate to have the touch sensing function and the displaying function, which is helpful to reduce the thickness of the touch display panel. In addition, in the invention, the organic light emitting layers and the active devices are fabricated on different substrates, which can advance the production yield of the touch display panel. Moreover, in the invention, a cavity is formed on the substrate to make the touch sensing structure disposed in the cavity, which contributes to reduce the electrical interference between the touch sensing structure and the OLED pixel units.
It will be apparent to those skilled in the art that the descriptions above are several preferred embodiments of the invention only, which does not limit the implementing range of the invention. Various modifications and variations can be made to the structure of the invention without departing from the scope or spirit of the invention. The claim scope of the invention is defined by the claims hereinafter.
| Number | Date | Country | Kind |
|---|---|---|---|
| 99138540 | Nov 2010 | TW | national |
