CN100421277C - organic light emitting diode panel - Google Patents

Abstract

An organic light emitting diode panel comprises a substrate defining a plurality of pixel regions, a heating circuit structure arranged on the substrate, and a plurality of organic light emitting diodes corresponding to the pixel regions. Wherein the heating circuit structure includes: two unconnected wires, multiple first and second heating wires connected to the two wires and covering part of the pixel region, and a grounding electrode. Wherein in each pixel region, the organic light emitting diode heated by each first heating line and the organic light emitting diode heated by each second heating line absorb unequal amounts of thermal energy and the characteristics change.

Description

Organic Light Emitting Diode Panel

technical field

The present invention relates to an organic light emitting diode panel (organic light emitting diode panel, OLED panel), in particular to a heating circuit structure (heating circuit structure) that can use a heating process (heating process) to directly produce different colors Pixel (pixel) organic light emitting diode panel.

Background technique

Among flat-panel displays, organic light-emitting diode displays started later than liquid crystal displays (LCDs), but they are characterized by self-illumination, wide viewing angles, fast response, low power consumption, strong contrast, high brightness, thin thickness, and full-color display. The advantages of modernization, simple structure, and wide operating temperature range have gradually attracted attention in the field of small and medium-sized portable displays. Especially after the unremitting research and development of industrial and research departments, some previously unsolvable problems, such as difficult control of process conditions, unfavorable mask application, unstable cap seal, etc., have now achieved breakthroughs. Looking ahead, organic light-emitting diode displays are even expected to be applied to the field of large-size displays.

When analyzing the future development of organic light-emitting diode displays, it is necessary to understand its driving method. The organic light-emitting diode display itself is a current-driven component, and its luminous brightness is determined by the magnitude of the passing current. At present, when OLED is applied to a matrix display (matrix display), it is achieved by controlling the magnitude of the OLED driving current. The effect of varying brightness (also known as grayscale). According to the differences in driving methods, matrix displays can be divided into passive matrix (passive matrix) displays and active matrix (active matrix) displays. The passive matrix display uses the method of sequentially driving the scanning lines to drive the pixels located in different rows/columns one by one, so the light-emitting time of the pixels on each row/column will be limited by the scanning frequency and the number of scanning lines of the display, which is less Suitable for displays with large screens and high resolution (meaning increased scan lines). An active matrix display forms an independent pixel circuit in each pixel, including a capacitor (Cs), an OLED light-emitting component, and at least two thin-film transistors (thin-film transistor, TFT), in order to utilize the pixel circuit To adjust the size of the driving current of the OLED, so even under the requirements of large screen and high resolution, it can still provide a stable driving current for each pixel, and improve the uniformity of the brightness of the display.

Similar to other displays, when an organic light-emitting diode display is to achieve color display, it must first form red, blue, and green three-color light, and then mix the three-color light to form various rich and bright colors. In the prior art, materials that emit white light are often used, and then the white light is passed through red, blue, and green color filters to generate red, blue, and green light. However, this method requires filters to be installed, and the alignment accuracy needs to be controlled in the process to avoid unevenness of the three-color light, so it often provides additional restrictions in the layout, thereby reducing the aperture ratio ( aperture ratio).

Therefore, another method is often used in the prior art, that is, using different materials to produce red, blue, and green three-color pixels, and then superimposing the three-color pixels into one color pixel, and then achieving the mixed red, blue, and green three-color light. the goal of. Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic diagram of an OLED panel 10 fabricated using three-color pixels in the prior art. As shown in FIG. 1 , the conventional OLED panel 10 includes a transparent substrate 12 , and the transparent substrate 12 is a glass substrate, a plastic substrate or a quartz substrate. An upper surface 14 of the transparent substrate 12 includes a plurality of red pixels 16 , blue pixels 18 and green pixels 22 arranged in an array, and adjacent red pixels 16 , blue pixels 18 and green pixels 22 form a color pixel 24 .

Please refer to FIG. 2 , which is a schematic cross-sectional view of the OLED panel 10 shown in FIG. 1 along the line 2-2'. As shown in FIG. 2, each pixel 16, 18, 22 of the OLED panel 10 (please refer to FIG. 1) includes a transparent conductive layer (transparent conductive layer) 26 formed on the surface of the transparent substrate 12 respectively. , 28, 32 are used as the anode (anode) of each organic light emitting diode; an organic thin film (organic thin film) 34 formed on the surface of the transparent conductive layer 26; an organic thin film (organic thin film) 34 formed on the surface of the transparent conductive layer 28 Thin film 36; An organic thin film 38 formed on the surface of transparent conductive layer 32; And a metal layer (metal layer) 42 formed on the surface of organic thin film 34,36,38 respectively, as the negative electrode of each organic light-emitting diode (cathode). And because the organic thin films 34, 36, 38 have been pre-planned before fabrication, the types, thicknesses, or combinations of the materials in each layer may be different. Therefore, under the same operating current, the organic light emitting diode panel 10 Each of the pixels 16 , 18 , 22 emits light of different colors, thereby constituting a color pixel 24 .

However, in the prior art, the white light material is used, and then the white light is passed through red, blue, and green three-color filters to generate red, blue, and green three-color light. Uniform, and easy to reduce the aperture ratio. The method of using different materials to produce red, blue and green three-color pixels, and then superimposing the three-color pixels into one color pixel to mix red, blue and green three-color light involves the difference of organic films in different color pixels. question. Due to the differences in the organic thin films in pixels of different colors, the production must be more complicated, and when the process control is not good, there will also be calibration problems and other problems derived from the process, which will cause product defects. Therefore, how to develop a new active matrix organic light-emitting diode panel, which not only does not need to use filters, but also does not cause the problem of calibration errors, and thus can increase the aperture ratio, and at the same time does not need to manufacture corresponding The organic thin films of pixels of different colors, so that the production process can be kept simple, has become a very important issue.

Contents of the invention

The main purpose of the present invention is to provide an organic light emitting diode panel, especially to provide an organic light emitting diode panel that can avoid the above-mentioned problems.

In an embodiment of the present invention, an organic light emitting diode panel is provided, and the organic light emitting diode panel includes: a substrate defining a plurality of pixel areas, a heating circuit structure, and a plurality of organic light emitting diodes corresponding to each pixel area . The heating circuit structure includes: two first wires and a second wire that are not connected to each other, the first wire and the second wire are arranged on the substrate; a first insulating layer, the first insulating layer is arranged on the substrate above, and the first insulating layer includes a plurality of first contact holes respectively exposing the first wire and the second wire; a plurality of first heating wires and a plurality of second heating wires, and the plurality of first heating wires The heating wire and a plurality of second heating wires are arranged on the first insulating layer, each first heating wire and each second heating wire are respectively electrically connected to the first wire and the second wire through each first contact hole, and each first The heating wire and each second heating wire respectively cover part of each pixel area; and a ground electrode, which is electrically connected to each first heating wire and each second heating wire, wherein in each pixel area, each first The organic light emitting diodes heated by the heating wires and the organic light emitting diodes heated by the respective second heating wires absorb unequal amounts of thermal energy and change in characteristics.

In another embodiment of the present invention, an organic light emitting diode panel is provided, including: a substrate, a plurality of pixel regions are defined on the substrate, and a diode region is defined in each of the pixel regions and a thin film transistor area; a plurality of first heating lines and a plurality of second heating lines are arranged on the substrate, and each of the first heating lines and each of the second heating lines respectively cover part of the Each of the pixel areas; a thin film transistor disposed on each of the first heating lines and each of the second heating lines in each of the thin film transistor areas; an insulating layer formed on the on the substrate, and the insulating layer covers each of the thin film transistors and each of the first heating wires and each of the second heating wires; and an organic light emitting diode is arranged on each of the diodes on the insulating layer in the region, wherein each of the first heating wires is electrically connected to a first wire disposed on the first heating wire to heat the corresponding organic light emitting diode to emit green light, and each of the second heating wires is electrically connected to a second wire arranged on the second heating wire to heat the corresponding organic light emitting diode to make it emit red light, and the insulation The layer covers the first wire and the second wire.

Since the organic light emitting diode panel of the present invention is provided with a heating circuit above or below the organic light emitting diode, and the first and second heating lines can be located under the buffer layer, or the first and second heating lines can be arranged on the Above or below the organic light emitting diodes, organic light emitting diodes emitting red light and green light are produced by using a heating process. Therefore, not only does not need to use filters, it can avoid the problem of calibration accuracy and improve the aperture ratio, and it does not need to set up different organic films for different colors to keep the process simple, and it is not necessary to derive extra due to complex processes. The problem. All in all, the organic light emitting diode panel of the present invention has the advantages of low cost, simple heat treatment procedure, and high productivity.

Description of drawings

FIG. 1 is a schematic diagram of manufacturing an OLED panel using three-color pixels in the prior art.

FIG. 2 is a schematic cross-sectional view of the OLED panel shown in FIG. 1 along the line 2-2'.

3 to 7 are schematic diagrams of an OLED panel in the first embodiment of the present invention.

8 to 9 are schematic cross-sectional views of an OLED panel in the second embodiment of the present invention.

10 to 13 are top views of the OLED panels of FIGS. 8 and 9 .

Explanation of reference signs:

10, 100, 200 OLED panels

12, 102, 202 Transparent substrate

14, 112 Upper surface

16, 134, 264 red pixels

18, 132, 262 blue pixels

22, 136, 266 green pixels

24, 138, 268 Color Pixels

26, 28, 32 Transparent conductive layer

34, 36, 38 Organic film

42 Metal layer

104, 204 pixel area

106, 244 The first wire

108, 246 Second wire

116, 242 The first line of contact

118, 212 The first heating line

122, 214 Second heating line

124 Grounding electrode

126 Heating circuit structure

128, 254 Organic Light Emitting Diodes

206 Diode area

208 MFT region

216 Ground electrode

218 Thin Film Transistor

222 buffer layer

224 polysilicon layer

226 Source electrode

228 Drain electrode

232 Channels

234 Gate insulating layer

236 Gate electrode

238 inner dielectric layer

248 Second contact hole

252 Insulation layer

256 Transparent pixel electrodes

258 The third contact hole

Detailed ways

Please refer to FIG. 3 to FIG. 7 , which are schematic diagrams of an OLED panel 100 in the first embodiment of the present invention. As shown in FIG. 3 , the organic light emitting diode display 100 of the present invention includes a transparent substrate 102, which is a glass substrate, a plastic substrate or a quartz substrate, and a pixel array area is defined on the transparent substrate 102 ( pixel array area, not shown) and a peripheral circuit area (periphery circuit area, not shown). A plurality of pixel areas (pixel area) 104 are defined in the pixel array area for accommodating OLED components and capacitors and thin film transistors matched with them, and the peripheral circuit area is used for accommodating control circuits. The focus of this paper has nothing to do with the peripheral circuit area, so I won’t repeat it here. Two first conductive lines (first conductive line) 106 and second conductive line (second conductive line) 108 that are not connected to each other are formed on the upper surface 112 of the substrate 102. In fact, the first and second conductive lines 106, 108 are formed on the organic light emitting diode. The signal line (signal line, not shown) on the panel 100 is formed by patterning the same metal layer, and the first and second wires 106, 108 include a tungsten line (W line), a chrome line (Cr line) or is another conductive metal wire.

As shown in FIG. 4 , the OLED panel 100 further includes a first isolation layer (not shown) disposed on the substrate 102, and the first insulation layer (not shown) covers each pixel area 104 and the first isolation layer. 1. Second wires 106 and 108 . The first insulating layer (not shown) includes a plurality of first contact holes 116 , and each first contact hole 116 respectively exposes part of the first and second wires 106 , 108 . The first insulating layer (not shown) includes a silicon oxide layer (TEOS-SiO ₂ layer), silicon dioxide layer (silicon oxide layer) or silicon nitride layer (silicon nitride layer) using tetraethoxysilane as a reactive gas. ).

As shown in FIG. 5 , the organic light emitting diode display 100 further includes a plurality of first heating wires (first heating wire) 118 and a plurality of second heating wires (second heating wire) 122 arranged on the substrate 102, each of the first and second heating wires The two heating wires 118 and 122 are respectively electrically connected to the first and second wires 106 and 108 through the first contact holes 116 . At the same time, each of the first and second heating lines 118 and 122 respectively covers part of each pixel area 104 . Each of the first and second heating wires 118 and 122 is made of indium tin oxide or indium zinc oxide. In fact, each of the first and second heating wires 118 and 122 may also be made of a translucent material, but when the first . When the second heating wires 118 and 122 are made of a transparent material (such as indium tin oxide or indium zinc oxide), it will be very helpful to the overall aperture ratio of the OLED panel 100 .

A ground electrode (ground electrode) 124 is additionally arranged on the substrate 102, and the ground electrode 124 is electrically connected to each of the first and second heating lines 118, 122 to maintain the voltage on each of the first and second heating lines 118, 122. Stablize. In fact, the ground electrode can also be an electrode electrically connected to other voltages, as long as the purpose of supplying the first and second heating wires 118 and 122 with a stable and sufficient heating voltage can be achieved. Since the first and second wires 106, 108 and the first and second heating wires 118, 122 are electrically isolated (electrically isolated) by a first insulating layer (not shown), therefore, the first and second wires 106, 108 In the heating circuit structure 126 formed with the first and second heating wires 118 , 122 and the ground electrode 124 , the first and second heating wires 118 , 122 do not affect each other at all. Meanwhile, the ground electrode 124 may be made of a transparent material, such as indium tin oxide or indium zinc oxide, or may be made of an opaque metal material.

A second insulating layer (not shown) is formed on the substrate 102, the second insulating layer (not shown) covers the heating circuit structure 126, and the second insulating layer includes a plurality of second contact holes. A plurality of organic light emitting diodes 128 (as shown in FIG. 6 ) are disposed on the second insulating layer and correspond to each pixel region 104 . Each OLED 128 includes a transparent electrode (not shown) formed on the second insulating layer; an organic thin film (not shown) formed on the transparent electrode (not shown); and a metal layer (not shown) ), formed on top of the organic film. Each transparent electrode is an indium tin oxide layer or an indium zinc oxide layer, and is used as an anode of each organic light emitting diode 128, and the metal layer is a magnesium metal layer, an aluminum metal layer, a lithium metal layer or an alloy layer, and used as the cathode of each organic light emitting diode 128. In fact, the metal layer can completely cover all the pixel regions 104 or cover each pixel region 104 respectively according to actual needs. Each pixel region 104 further includes at least one thin film transistor, and each transparent electrode is electrically connected to a drain (not shown) of a thin film transistor therein through each second contact hole (not shown).

As shown in FIG. 7, the first and second wires 106, 108 are electrically connected to the same voltage source or current source via an external power line (not shown), but may also be electrically connected to different voltage sources or current sources. Therefore, when an external voltage is applied to the heating circuit structure 126 via the first and second wires 106 , 108 , a corresponding current will flow through the respective first and second heating wires 118 , 122 . Based on the principle that the product of the resistance and the square of the current is equal to the power, each of the first and second heating wires 118 , 122 will provide heat energy to each of the organic light emitting diodes 128 above them. At this time, the organic light emitting diodes 128 that have not been heated are not affected at all. When adjusting the magnitude of the applied voltage and performing the heating process, the organic light emitting diodes 128 above the first heating lines 118 and the second heating lines are Each OLED 128 above 122 will absorb a unequal amount of thermal energy and change the characteristics of the OLED 128 .

During official operation, each organic light emitting diode 128 that has not been heated will emit blue light, and make the pixel areas corresponding to these organic light emitting diodes 128 become blue pixels 132, and each organic light emitting diode 128 that absorbs more heat energy will emit red light. light, and make the pixel areas corresponding to these organic light emitting diodes 128 become red pixels 134, and the organic light emitting diodes 128 that absorb less heat energy will emit green light, and make the pixel areas corresponding to these organic light emitting diodes 128 become red pixels 134 Green Pixel 136. And the adjacent blue pixel 132 , red pixel 134 and green pixel 136 form a color pixel 138 . It is worth mentioning that when the ground electrode 124 is made of indium tin oxide or indium zinc oxide, its width must be greater than the width of the first and second wires 106, 108, so as to reduce the number of blue pixels 132, red pixels 134 and The difference in resistance between the green pixels 136 improves the uniformity of heating, thereby improving the uniformity of blue light, red light, and green light. However, when the material of the ground electrode 124 is metal, there is no such limitation.

Each of the first and second heating wires 118, 122 may have any shape, not limited to the stripe structure shown in the figure. Since the arrangement of the organic light emitting diodes 128 emitting green light, red light, and blue light includes mosaic arrangement (Mosaic Type), triangle arrangement (Triangle Type) or stripe arrangement (Stripe Type), each of the first and second heating wires 118 , 122 may also be presented in broken lines or other forms. In fact, as long as each of the first and second heating lines 118 and 122 can uniformly cover each pixel area 104 to be heated and achieve the purpose of uniform heating, it is covered by the present invention. In addition, at least one thin film transistor (not shown) included in each pixel area 104 will constitute a driving circuit, and make each pixel in the panel generate a corresponding output current corresponding to the signal transmitted by the driving circuit, and then control each Luminous brightness of the organic light emitting diode 128. At the same time, the heating circuit provided by the present invention can not only be applied to active matrix (active matrix) panels, but also can be applied to passive matrix (passive matrix) panels.

However, the embodiments of the present invention are not limited to the structure in which the heating circuit structure 126 is disposed under each OLED. In fact, in the OLED panel 100 of the present invention, each of the first and second heating wires 118 and 122 can also be disposed above each of the OLEDs. In this case, the organic light emitting diodes and the first and second wires 106 and 108 are firstly arranged on the substrate 102, and at the same time the first and second wires 106 and 108 form signals on the organic light emitting diode panel 100. Lines (not shown) are formed by patterning the same metal layer. Each OLED is electrically isolated from each first and second heating wire 118, 122 by means of a first insulating layer (not shown), or before making each first and second heating wire 118, 122, first Form other insulating layers (not shown) to strengthen the electrical isolation between each OLED and each of the first and second heating lines 118, 122, and then use a plurality of contact holes (not shown) in the first insulating layer (not shown) display, or a plurality of contact holes in other insulating layers) to electrically connect each organic light emitting diode to each first and second heating wire 118, 122 respectively, and connect each first and second heating wire 118 , 122 are electrically connected to the first and second wires 106, 108, respectively. In normal operation, each first heating wire 118 will heat the corresponding OLED, so that the OLED below it emits green light, and each second heating wire 122 is used to heat the corresponding OLED, Make the organic light-emitting diode located below it emit red light, while the unheated organic light-emitting diode will emit blue light. In this structure, other implementations are the same as the structure in which the OLED 128 is disposed above the heating circuit structure 126 .

In addition, in the embodiment of the present invention, even if the heating circuit structure is disposed under each organic light emitting diode, there may be other embodiments. Please refer to FIGS. 8 to 13. FIGS. 8 to 9 are schematic cross-sectional views of an OLED panel 200 in a second embodiment of the present invention. FIGS. 10 to 13 are top views of the OLED panel 200 in FIGS. 8 and 9. . As shown in FIG. 8 and FIG. 10, the organic light emitting diode panel 200 of the present invention includes a transparent substrate 202, which is a glass substrate, a plastic substrate or a quartz substrate, and a pixel is defined on the transparent substrate 202. An array area (not shown) and a peripheral circuit area (not shown). A plurality of pixel regions 204 are defined in the pixel array region, and a diode region (diode region) 206 and a thin film transistor region (thin film transistor region) 208 are respectively defined in each pixel region 204 for accommodating OLED components and interacting with them. Matching capacitors and thin film transistors. The peripheral circuit area is used for accommodating the control circuit. Since the focus of the present invention has nothing to do with the peripheral circuit area, it will not be repeated here.

A plurality of first and second heating lines 212 and 214 are disposed on the upper surface of the transparent substrate 202 , and each of the first and second heating lines 212 and 214 covers part of each pixel area 204 respectively. The transparent substrate 202 further includes a ground electrode 216 connected to each of the first and second heating wires 212 , 214 . Each of the first and second heating wires 212 , 214 and the ground electrode 216 is made of ITO or IZO. In fact, each of the first and second heating wires 212 and 214 may also be made of a translucent material, but when each of the first and second heating wires 214 is made of a transparent material, the organic light emitting diode panel 200 as a whole The aperture ratio will be very positive, and at the same time, the ground electrode may also be made of opaque metal material.

As shown in FIG. 8 , a thin film transistor 218 is disposed on the heating line in the thin film transistor region 208 (here, the first heating line 212 is taken as an example for illustration), and the connection between the thin film transistor 218 and the first heating line 212 A buffer layer (buffer layer) 222 is included. The thin film transistor 218 includes a polysilicon layer (poly-Si layer) 224, and the polysilicon layer 224 includes a source electrode (source electrode) 226 of the thin film transistor 218, a drain electrode (drain electrode) 228 and A channel (channel) 232, a gate insulating layer (gate insulating layer, GI layer) 234 is arranged on the buffer layer 222 and covers the polysilicon layer 224, a gate electrode (gate electrode) 236 is arranged on the top of the channel 232 On the surface of the gate insulating layer 234, an inter layer dielectric layer (inter layer dielectric, ILD) 238 is arranged on the gate insulating layer 234 and covers the gate electrode 236, and at least one first contact hole 242 penetrates the inter layer dielectric The electrical layer 238 is connected to the gate insulating layer 234 . The buffer layer 222 is made of silicon oxide, which not only prevents impurities in the transparent substrate 202 from diffusing upward, but also serves as a buffer for laser processing the polysilicon layer 224 .

As shown in FIG. 9 and FIG. 11 , two first and second wires 244 and 246 that are not connected to each other are arranged on the transparent substrate 202, and respectively pass through a plurality of buffer layers 222 and gate electrodes located outside each pixel area 204. The insulating layer 234 and the second contact holes 248 of the inner layer dielectric layer 238 are electrically connected to the first and second heating wires 212, 214. In FIG. The connection to the first heating wire 212 is taken as an example for illustration.

Please refer to FIG. 8 . It is worth noting that while making the first and second contact holes 242 and 248 in the OLED panel 200, all the buffer layers 222, gate insulating layers 234 and The inner dielectric layer 238 is etched clean, so that when the organic light emitting diode panel 200 is subsequently completed, the first heating wire 212 and the organic light emitting diode (not shown) will not be separated by a thick insulating layer, so as to ensure heating efficiency (same as The same applies between the second heating wire 214 and the OLED). In fact, the first and second conductive lines 244, 246 and the signal lines (not shown) formed on the OLED panel 200 are formed by patterning the same metal layer, and the source electrode 226 of the thin film transistor 218 is formed through the first The contact hole 242 is electrically connected to a corresponding signal line (not shown). The first and second wires 244, 246 include a tungsten wire, a chromium wire or a other conductive metal wire.

事实上，绝缘层252覆盖整个透明基板202，即各第一、第二加热线212、214、各薄膜晶体管218、第一、第二导线244、246以及透明接地电极216均受绝缘层252的保护。As shown in FIG. 8 and FIG. 9 , an insulating layer 252 is formed on the transparent substrate 202 and covers the thin film transistor 218 and the first heating line 212 . The insulating layer 252 is made of silicon oxide, and the thickness of the insulating layer 252 is approximately equal to 1000 Angstroms.

In fact, the insulating layer 252 covers the entire transparent substrate 202, that is, the first and second heating wires 212, 214, the thin film transistors 218, the first and second wires 244, 246, and the transparent ground electrode 216 are all protected by the insulating layer 252. Protect.

As shown in FIGS. 8 and 12 , an OLED 254 is disposed on the insulating layer 252 in the diode region 206 . The OLED 254 includes a transparent pixel electrode (pixel electrode) 256 formed on the insulating layer 252; an organic thin film (not shown) formed on the transparent pixel electrode 256; and a metal layer (not shown) formed on the on the organic film. The transparent pixel electrode 256 is an indium tin oxide layer or an indium zinc oxide layer, and is used as an anode of the organic light emitting diode 254, and the metal layer is a magnesium metal layer, an aluminum metal layer, a lithium metal layer or an alloy layer, and used as the cathode of the OLED 254. In FIG. 8 , only the transparent pixel electrode 256 is specifically shown, and the organic thin film and the metal layer are not clearly shown because there are many variations. In fact, the metal layer can completely cover all the pixel regions 204 or cover each diode region 206 according to actual needs. The transparent pixel electrode 256 is electrically connected to the drain electrode 228 of the TFT 218 through a third contact hole 258 . As shown in FIG. 12 , an organic light emitting diode 254 is respectively disposed in each pixel area 204 .

As shown in FIG. 13, the first and second wires 244, 246 are electrically connected to the same voltage source or current source via an external power line (not shown), but may also be electrically connected to different voltage sources or current sources. Therefore, when an external voltage is applied to the first and second wires 244 , 246 , corresponding currents will flow through the first and second heating wires 212 , 214 . Based on the principle that the product of the resistance and the square of the current is equal to the power, each of the first and second heating wires 212 , 214 will provide heat energy to each of the OLEDs 254 above them. At this time, by adjusting the magnitude of the applied voltage and the time of the heating process, the organic light emitting diodes 254 above the first heating lines 212 and the organic light emitting diodes 254 above the second heating lines 214 will absorb different amounts of thermal energy, and change the characteristics of the OLED 254.

During normal operation, each organic light emitting diode 254 that has not been heated will emit blue light, and make the pixel areas corresponding to these organic light emitting diodes 254 become blue pixels 262, and each organic light emitting diode 254 that absorbs more heat energy will emit red light. light, and make the pixel areas corresponding to these organic light emitting diodes 254 become red pixels 264, and the organic light emitting diodes 254 that absorb less heat energy will emit green light, and make the pixel areas corresponding to these organic light emitting diodes 254 become red pixels 264 266 green pixels. And the adjacent blue pixel 262 , red pixel 264 and green pixel 266 form a color pixel 268 . In this embodiment, the organic light emitting diodes 254 above the first heating lines 212 emit red light, the organic light emitting diodes 254 above the second heating lines 214 emit green light, and the organic light emitting diodes 254 that are not heated emits blue light.

It is worth mentioning that the ground electrode 216 is electrically connected to each of the first and second heating wires 212 and 214 to maintain a stable voltage on each of the first and second heating wires 214 . In fact, the ground electrode 216 can also be an electrode electrically connected to other voltages, as long as the purpose of supplying each heating wire 212 and 214 with a stable and sufficient heating voltage can be achieved. In this embodiment, when the ground electrode 216 is made of a transparent material (such as indium tin oxide or indium zinc oxide), its width must be greater than the width of the first and second wires 244 and 246, so as to reduce the temperature of the first and second heating wires. 214, and further improve the heating uniformity of the red pixel 264 and the green pixel 266, in order to achieve good uniformity of blue light, red light and green light. However, when the material of the ground electrode is metal, there is no such limitation. In addition, since the first and second wires 244, 246 are electrically isolated from the first and second heating wires 212, 214 by the buffer layer 222, the gate insulating layer 234 and the inner layer dielectric layer 238, therefore, the first, second In the heating circuit structure formed by the second wires 244 and 246 , the first and second heating wires 212 and 214 and the ground electrode 216 , the first and second heating wires 212 and 214 will not affect each other at all.

Each of the first and second heating wires 212, 214 may have any shape, not limited to the strip structure shown in the figure. Since the organic light emitting diodes 254 emitting green light, red light, and blue light are arranged in a mosaic arrangement, triangular arrangement or stripe arrangement, the first and second heating lines 212 and 214 may also be arranged in zigzag lines or other patterns. presented. In fact, as long as each of the first and second heating lines 212 and 214 can uniformly cover each pixel area 204 to be heated and achieve uniform heating, it is covered by the present invention. Meanwhile, the first and second heating wires 212 , 214 may also bypass the thin film transistors 218 . In this case, the thin film transistors 218 are directly disposed on the surface of the transparent substrate 202 in the thin film transistor regions 208 . In addition, the thin film transistor 218 and other thin film transistors (not shown) included in each pixel area 204 constitute a driving circuit, and each pixel in the panel generates a corresponding output current corresponding to the signal transmitted by the driving circuit. , and further control the luminance of each organic light emitting diode 254 . In addition, the heating circuit provided by the present invention can be applied not only to active matrix panels, but also to passive matrix panels.

Compared with the prior art, the organic light emitting diode panel of the present invention is provided with a heating circuit above or below the organic light emitting diode, wherein each of the first and second heating wires can be located below the buffer layer, or each of the first and second heating lines can be placed under the buffer layer. The second heating line is arranged above or below each organic light emitting diode, and then a heating process is used to manufacture organic light emitting diodes emitting red light and green light. In this way, not only does not need to use filters, it can avoid the problem of calibration accuracy and improve the aperture ratio, and it does not need to set up different organic films for different colors to keep the process simple, so that it will not be lost due to complicated processes. Raise additional questions. All in all, the organic light emitting diode panel of the present invention has the advantages of low cost, simple heat treatment procedure and high yield.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope defined by the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. An organic light emitting diode panel, comprising: A substrate, on which a plurality of pixel regions are defined; A heating circuit structure, the heating circuit structure includes: a first wire and a second wire not connected to each other, both formed on the substrate; a first insulation layer formed on the substrate layer, the first insulating layer further includes a plurality of first contact holes respectively exposing the first wire and the second wire; a plurality of first heating wires and a plurality of second heating wires, all disposed on the first insulating layer, each of the first heating wires and each of the second heating wires are respectively electrically connected to the first wire and the first heating wire through each of the first contact holes. the second wire, and each of the first heating wires and each of the second heating wires cover part of each of the pixel areas; and a ground electrode, the ground electrode is electrically connected to each the first heating wire and each of the second heating wires; and a plurality of organic light emitting diodes, corresponding to each of said pixel regions, In each of the pixel regions, the organic light emitting diodes heated by each of the first heating lines and the organic light emitting diodes heated by each of the second heating lines absorb different amounts of heat energy and their characteristics change. 2. The panel according to claim 1, further comprising a second insulating layer covering the heating circuit structure, and each of the organic light emitting diodes is disposed on the second insulating layer . 3. The panel as claimed in claim 1, wherein each of the first heating lines is used to heat the corresponding organic light emitting diode, so that the organic light emitting diode located above each of the first heating lines emits green light, And each of the second heating lines is used to heat the corresponding organic light emitting diodes, so that the organic light emitting diodes located above each of the second heating lines emit red light, and each of the organic light emitting diodes that have not been heated LEDs emit blue light. 4. The panel as claimed in claim 1, wherein each of the organic light emitting diodes is disposed under the first insulating layer. 5. The panel as claimed in claim 1 , wherein said pixel area comprises at least one thin film transistor, and said thin film transistor is used to control the luminance of each of said organic light emitting diodes. 6. The panel of claim 2, wherein each of said organic light emitting diodes comprises: A transparent electrode formed on the second insulating layer, wherein each of the transparent electrodes is used as an anode of each of the organic light emitting diodes; an organic thin film formed on the transparent electrode; and A metal layer is formed on the organic thin film, wherein each of the metal layers is used as a cathode of each of the organic light emitting diodes. 7. The panel as claimed in claim 1 , wherein the ground electrode is a transparent ground electrode, and the width of the ground electrode is larger than the width of the first wire and the width of a second wire. 8. An organic light emitting diode panel comprising: A substrate, on which a plurality of pixel areas are defined, and a diode area and a thin film transistor area are respectively defined in each of the pixel areas; A plurality of first heating lines and a plurality of second heating lines are arranged on the substrate, and each of the first heating lines and each of the second heating lines respectively cover part of each of the pixel areas ; A thin film transistor disposed on each of the first heating lines and each of the second heating lines in each of the thin film transistor regions; an insulating layer formed on the substrate, and the insulating layer covers each of the thin film transistors and each of the first heating lines and each of the second heating lines; and an organic light emitting diode, disposed on the insulating layer in each of the diode regions, Wherein each of the first heating wires is electrically connected to a first wire provided on the first heating wire to heat the corresponding organic light emitting diode to make it emit green light, and each of the second heating wires The heating wire is electrically connected to a second wire arranged on the second heating wire to heat the corresponding organic light emitting diode to make it emit red light, and the insulating layer covers the first wire and the the second wire. 9. The panel of claim 8, wherein said first wire and said second wire are not connected. 10. The panel as claimed in claim 8, further comprising a ground electrode connected to each of said first heating lines and each of said second heating lines.

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