TWI506773B - Organic electroluminescent type touch display panel - Google Patents

Description

Organic electroluminescent touch display panel

The invention relates to an organic electroluminescent touch display panel.

At present, an organic electroluminescent display panel is usually implemented by attaching a touch screen to an organic electroluminescent display panel by bonding or the like. However, the above-mentioned additional touch screen not only causes the assembly structure of the organic electroluminescence display panel to be complicated, but also makes it difficult to reduce the thickness of the entire organic electroluminescence display panel, and it is difficult to conform to the development trend of the increasingly integrated and light and thin existing touch display panels. .

In view of this, it is necessary to provide an organic electroluminescent touch display panel having a relatively simple structure.

An organic electroluminescent touch display panel includes a light emitting structure, a touch conductive structure and a driving structure. The light emitting structure includes a cathode, an anode, and an organic light emitting layer sandwiched between the cathode and the anode. The touch conductive structure is electrically connected to the anode for detecting a touch action applied to the organic electroluminescent touch display panel. The driving structure is electrically connected to the light emitting structure for providing a display driving signal to the light emitting structure and providing a touch driving signal to the touch conductive structure.

Compared with the prior art, in the organic electroluminescent touch display panel of the present invention, the cathode can also detect the touch applied to the organic electroluminescent touch display panel. The action is such that the display driving structure of the organic electroluminescent touch display panel is integrated with the touch driving structure, and no additional touch screen is needed, so that the organic electroluminescent touch display panel is relatively simple.

10‧‧‧Organic electroluminescent touch display panel

11‧‧‧Lighting structure

12‧‧‧Touch conductive structure

13‧‧‧Drive structure

111‧‧‧Anode

112‧‧‧ cathode

113‧‧‧Organic light-emitting layer

131‧‧‧First film transistor

132‧‧‧Second thin film transistor

133‧‧‧ Storage Capacitor

134‧‧ ‧ gate line

135‧‧‧Information line

136‧‧‧Power line

150‧‧‧ pixels

116‧‧‧First conductive line

118‧‧‧Second conductive line

121‧‧‧First touch line

122‧‧‧second touch line

101‧‧‧First substrate

102‧‧‧second substrate

104‧‧‧ Sealant

137‧‧‧ gate insulation

138‧‧‧First isolation group

139‧‧‧Second isolation group

130‧‧‧ Passivation layer

G‧‧‧ gate

S‧‧‧ source

D‧‧‧汲

160‧‧‧ channel layer

170, 172‧‧‧through holes

181‧‧‧Conducting components

182‧‧‧ Signal Transport Layer

183‧‧‧Soft circuit board

1 is a schematic view showing the circuit structure of an organic electroluminescent touch display panel of the present invention.

2 is a schematic plan view showing the structure of a touch conductive structure of the organic electroluminescent touch display panel of FIG. 1 .

3 is a cross-sectional view of the organic electroluminescent touch display panel of FIG. 1.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing the circuit structure of an organic electroluminescent display panel 10 according to the present invention. The organic electroluminescent display panel 10 can be an organic light emitting diode (OLED) touch display panel including a light emitting structure 11 and a driving structure 13 . The light emitting structure 11 includes an anode 111, a cathode 112, and an organic light emitting layer 113 sandwiched between the cathode 112 and the anode 111. The organic light-emitting layer 113 is used to emit light under the driving of the anode 111 and the cathode 112. The driving structure 13 is electrically connected to the light emitting structure 11 for providing a display driving signal to the light emitting structure 11. The cathode 112 also receives a touch driving signal for detecting a touch action applied to the organic electroluminescent touch display panel 10.

The driving structure 13 includes a first thin film transistor 131, a second thin film transistor 132, a storage capacitor 133, a gate line 134, a data line 135, and a power line 136. The data line 135 and the power line 136 are parallel to each other and perpendicularly insulated from the gate line 134. The data line 135, the power line 136 and the gate line 134 intersect to define a plurality of pixels 150 arranged in a matrix. Each of the pixels 150 includes a light emitting structure 11 , a storage capacitor 133 , a first thin film transistor 131 , and a second thin film transistor 132 . Among them, the The gate of the first thin film transistor 131 is connected to the gate line 134. The source of the first thin film transistor 131 is connected to the data line 135. The drain of the first thin film transistor 131 is connected to the power via the storage capacitor 133. Line 136. The gate of the second thin film transistor 132 is connected to the drain of the first thin film transistor 131, the drain of the second thin film transistor 132 is connected to the anode 111 of the light emitting structure 11, and the source of the second thin film transistor 132 The power line 136 is connected to the pole.

The cathode 112 includes a first conductive line 116 and a second conductive line 118 that are insulated from each other. The first conductive line 116 and the second conductive line 118 form a capacitive touch conductive structure. In this embodiment, the first conductive line 116 and the second conductive line 118 are adjacent to each other and extend in the direction of the pixel matrix row. Further, please refer to FIG. 2. FIG. 2 is a schematic plan view showing the cathode 112 of the organic electroluminescent touch display panel 10 of FIG. The first conductive line 116 and the second conductive line 118 are comb-shaped, and the comb shape of the first conductive line 116 and the comb-like staggered engagement of the second conductive line 118. The first conductive line 116 is capacitively coupled to the second conductive line 118 such that the cathode 112 forms a capacitive touch circuit structure.

In addition, preferably, the first conductive lines 116 of each row of pixels 150 are sequentially connected to form a first touch line 121, and the second conductive lines 118 of each row of pixels 150 are sequentially connected to form a second touch. The first touch line 121 and the second touch line 122 are insulated from each other. It can be understood that the touch driving signal applied to the cathode 112 can include a touch scan signal applied to the first touch line 121 and a touch detection applied to the second touch line 122 with a constant potential. Test signal.

Please refer to FIG. 3 . FIG. 3 is a cross-sectional view of the organic electroluminescent touch display panel 10 of FIG. 1 . It can be understood that the cross-sectional view is only shown because the cross-sectional angle is limited. A partial cross-sectional structure of a pixel. The organic electroluminescent touch display panel 10 further includes a first substrate 101, a second substrate 102, a sealant 104, a conductive element 181, and a signal transmission layer 182. The driving structure 13 is disposed on the first substrate 101. The anode 111 is disposed on a side of the driving structure 13 away from the first substrate 101 and electrically connected to the driving structure 13. The organic light emitting layer 113 is disposed away from the anode 111. On one side of the first substrate 101, the cathode 112 is disposed on a side of the organic light-emitting layer 113 away from the first substrate 101.

The second substrate 102 is a package cover plate and the first substrate 101 is connected through the sealant 104 , so that the first substrate 101 and the second substrate 102 encapsulate the light emitting structure 11 and the driving structure 13 therebetween. The second substrate 102 is located on a side of the cathode 112 away from the first substrate 101. The signal transmission layer 182 is disposed on a side of the second substrate 102 adjacent to the cathode 112. The conductive component 181 is sandwiched between the cathode 112 and the cathode substrate 112. Between the signal transmission layers 182, the cathode 112 and the signal transmission layer 182 are electrically connected. The signal transmission layer 182 is used to connect to the external flexible circuit board 183. An external touch driving signal from the flexible circuit board 183 is sequentially transmitted to the cathode 112 via the signal transmission layer 182 and the conductive element 181. The conductive element 181 can be a conductive spacer or a conductive paste.

The driving structure 13 further includes a gate insulating layer 137, a first isolation layer group 138, a second isolation layer group 139, and a passivation layer 130. The first thin film transistor 131 and the second thin film transistor 132 include a channel layer 160. The first isolation layer group 138 is disposed on the first substrate 101. The channel layer 160 is disposed on the first isolation layer group 138. The gate insulation layer 137 is disposed on the channel layer 160. The gate electrode G is disposed on the gate insulating layer 137, and the second isolation layer group 139 is disposed on the gate G and the gate insulating layer 137. The source S And the bungee D is set in the second isolation The layer group 139 is connected to the channel layer 160 through the via hole 170 in the second isolation layer group 139. The passivation layer 130 is disposed on the source S, the drain D, and the second isolation layer group 139. The anode 111 is disposed on the passivation layer 130 and is connected to the drain D through a via hole 172 in the passivation layer 130. The organic light emitting layer 113 and the cathode 112 are sequentially disposed on the anode 111.

In addition, at least one of the first thin film transistor 131 and the second thin film transistor 132 is a low temperature polysilicon (LTPS) thin film transistor. The organic light emitting layer 113 may include a hole transport layer, an organic layer, an electron transport layer, and the like. The organic electroluminescent display panel 10 is a top-emitting organic electroluminescent display panel. The light emitted by the illumination structure 11 is sequentially provided to the panel viewer via the driving structure 13 and the first substrate 101. .

Compared with the prior art, in the organic electroluminescent display panel 10 of the present invention, the cathode 112 can also detect a touch action applied to the organic electroluminescent touch display panel 10, so that the organic electro The display driving structure of the light-emitting touch display panel 10 is integrated with the touch driving structure, and no additional touch screen is needed, so that the organic electroluminescent touch display panel 10 is relatively simple.

In addition, the cathode 112 is connected to the signal transmission layer 182 of the second substrate 102 via the conductive element 181, so that the external touch driving signal is provided via the second substrate 102, and the display driving signal can be provided to the driving structure via the first substrate. 13. The touch driving signal and the display driving signal are respectively provided from different substrates to avoid the problem that the flexible circuit board and the wiring are complicated and disordered due to the supply of the same substrate layer, and the organic electroluminescent touch display panel 10 is improved. Reliability.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention The present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are intended to be included in the following claims.

10‧‧‧Organic electroluminescent touch display panel

11‧‧‧Lighting structure

13‧‧‧Drive structure

111‧‧‧Anode

112‧‧‧ cathode

113‧‧‧Organic light-emitting layer

131‧‧‧First film transistor

132‧‧‧Second thin film transistor

133‧‧‧ Storage Capacitor

134‧‧ ‧ gate line

135‧‧‧Information line

136‧‧‧Power line

150‧‧‧ pixels

116‧‧‧First conductive line

118‧‧‧Second conductive line

121‧‧‧First touch line

122‧‧‧second touch line

Claims (11)

An organic electroluminescent touch display panel comprising a light emitting structure, the light emitting structure comprising a cathode, an anode and an organic light emitting layer sandwiched between the cathode and the anode, the organic light emitting layer driving at the anode and the cathode The cathode further receives a touch driving signal for detecting a touch action applied to the organic electroluminescent touch display panel, the cathode comprising a first conductive line and a second conductive line insulated from each other, The first conductive line and the second conductive line form a capacitive touch conductive structure. The organic electroluminescent touch display panel of claim 1, wherein the organic electroluminescent touch display panel further defines a plurality of pixels arranged in a matrix, the first conductive line and the first The two conductive lines are disposed adjacent to each other and extend in the direction of the pixel matrix row. The organic electroluminescent touch display panel of claim 2, wherein the first conductive lines of each row of pixels are sequentially connected to form a first touch line, and the second conductive line of each row of pixels The lines are sequentially connected to form a second touch line, and the first touch line and the second touch line are insulated from each other. The organic electroluminescent touch display panel of claim 2, wherein the first conductive line and the second conductive line are comb-shaped, and the comb of the first conductive line and the second The comb-like staggered engagement of the conductive lines. The organic electroluminescent touch display panel according to any one of the preceding claims, wherein the organic electroluminescent touch display panel further comprises a first substrate, a second substrate, a conductive component, and a signal transmission layer The driving structure is disposed on the first substrate, the anode is disposed on a side of the driving structure away from the first substrate and electrically connected to the driving structure, and the organic light emitting layer is disposed on a side of the anode away from the first substrate The cathode is disposed on a side of the organic light emitting layer away from the first substrate, and the second substrate is located on a side of the cathode away from the first substrate, and the signal is transmitted. The layer is disposed on a side of the second substrate adjacent to the cathode, and the conductive component is sandwiched between the cathode and the signal transmission layer for electrically connecting the cathode and the signal transmission layer, and the external touch driving signal is sequentially passed through the The signal transmission layer and the conductive element are transmitted to the cathode. The organic electroluminescent touch display panel of claim 5, wherein the conductive component is a conductive spacer or a conductive paste, and the signal transmission layer is configured to connect an external flexible circuit board to receive an external touch driving signal. . The organic electroluminescent touch display panel of claim 5, wherein the organic electroluminescent touch display panel further comprises a sealant, the second substrate is a package cover and is connected by a sealant. The first substrate, such that the first substrate and the second substrate encapsulate the light emitting structure and the driving structure therebetween. The organic electroluminescent touch display panel of claim 5, wherein the driving structure comprises a gate line, a data line, a power line, a storage capacitor, a first thin film transistor, and a second thin film transistor. The gate line is insulated from the data line and the power line, the gate of the first thin film transistor is connected to the gate line, and the source of the first thin film transistor is connected to the data line, the first thin film transistor a drain is connected to the power line via the storage capacitor, a gate of the second thin film transistor is connected to a drain of the first thin film transistor, and a drain of the second thin film transistor is connected to an anode of the light emitting structure, the first The source of the two thin film transistors is connected to the power line. The organic electroluminescent touch display panel of claim 8, wherein at least one of the first thin film transistor and the second thin film transistor is a low temperature polycrystalline thin film transistor. The organic electroluminescent touch display panel of claim 9, wherein the driving structure further comprises a gate insulating layer, a first isolation layer group, a second isolation layer group and a passivation layer, the first film The transistor and the second thin film transistor comprise a channel layer, the first isolation layer group is disposed on the first substrate, the channel layer is disposed on the first isolation layer group, and the gate insulating layer is disposed on the On the channel layer, the gate is disposed on the gate insulating layer, the second isolation layer is disposed on the gate and the gate insulating layer, and the source and the drain are disposed on the second isolation layer And passed separately The via holes in the second isolation layer group are connected to the channel layer, and the passivation layer is disposed on the source, the drain, and the second isolation layer group, and the anode is disposed on the passivation layer and passes the passivation layer A via hole in the layer is connected to the drain, and the organic light emitting layer and the cathode are sequentially disposed on the anode. The organic electroluminescent touch display panel of claim 1, wherein the organic electroluminescent touch display panel is a top-emitting organic electroluminescent touch display panel, and the organic light emitting layer is emitted The light is sequentially supplied to the panel viewer via the drive structure.