TWI500146B - Pixel structure of electroluminescent display panel - Google Patents

Description

Pixel structure of electroluminescent display panel

The present invention relates to a pixel structure of an electroluminescent display panel, and more particularly to a pixel structure of an electroluminescent display panel having a hole layer having a flat upper surface.

An electroluminescent display panel such as an organic light emitting diode display panel has been expected to be replaced due to its self-luminous (no backlight module) and low power consumption. The liquid crystal display panel has become the mainstream of display technology for the next generation. The current full-color electroluminescent display panel mainly uses a white organic light-emitting layer to generate white light, and then uses color filter filtering to form three different primary colors such as red light, green light and blue light, thereby displaying a full-color display. . However, since the white light belongs to a wide-spectrum light source, the red, green, and blue light generated by the filtering through the color filter are still not saturated enough, so that the color gamut is not high enough. In addition, if the red organic light-emitting layer, the green organic light-emitting layer, and the blue organic light-emitting layer are respectively disposed in different sub-pixel regions to respectively emit light, the color saturation may be improved, but the evaporation is required separately. In the form of organic light-emitting materials of different colors, in addition to the use of a large number of Fine Metal Masks (FMMs) and complicated processes, there are also problems such as easy color mixing and low yield.

One of the objects of the present invention is to provide a pixel structure of an electroluminescent display panel to save manufacturing cost and improve uniformity of illumination.

One embodiment of the present invention provides a pixel structure of an electroluminescent display panel. The pixel structure of the electroluminescent display panel is disposed on a substrate, and the substrate comprises a first pixel region, a second pixel region and a third pixel region. The pixel structure of the electroluminescent display panel comprises a first reflective electrode, a second reflective electrode, a third reflective electrode, a hole layer, a light emitting layer and a half penetrating semi-reflective electrode. The first reflective electrode is disposed in the first pixel region of the substrate, the second reflective electrode is disposed in the second pixel region of the substrate, and the third reflective electrode is disposed in the third pixel region of the substrate, wherein the first reflective electrode The second reflective electrode and the third reflective electrode are disposed on different horizontal planes. The hole layer is disposed on the first reflective electrode, the second reflective electrode, and the third reflective electrode, and the hole layer has a flat upper surface. The luminescent layer is disposed on the hole layer. The transflective electrode is disposed on the light emitting layer. a first microresonant cavity is formed between the transflective electrode and the first reflective electrode in the first pixel region, and between the transflective electrode and the second reflective electrode in the second pixel region Forming a second micro-resonator cavity, in the third pixel region, a third micro-resonant cavity is formed between the semi-transmissive semi-reflective electrode and the third reflective electrode, and the first micro-resonant cavity and the second micro-resonant cavity are The third microresonator has a different resonant cavity length. The hole layer includes at least a first common portion disposed between the first pixel region and the second pixel region, and the hole layer is continuously distributed at least in the first pixel region and the second pixel region.

The hole layer of the pixel structure of the electroluminescence display panel of the present invention has a flat upper surface, so that the subsequently formed light-emitting layer and the semi-transmissive semi-reflective electrode and the like have better flatness, and can enhance illumination. Uniformity. The first pixel region, the second pixel region, and the third pixel region have different cavity lengths, so that a full color display effect can be achieved without using a color filter.

1‧‧‧Pixel structure of electroluminescent display panel

10‧‧‧Substrate

101‧‧‧The first picture area

102‧‧‧second picture area

103‧‧‧ Third Picture Area

121‧‧‧First reflective electrode

122‧‧‧second reflective electrode

123‧‧‧third reflective electrode

14‧‧‧ hole layer

16‧‧‧Lighting layer

18‧‧‧Semi-transflective electrode

14S‧‧‧flat upper surface

141‧‧‧First shared part

142‧‧‧Second shared part

201‧‧‧First microresonator

202‧‧‧Second microresonator

203‧‧‧ third micro-resonator

L1‧‧‧first primary color light

L2‧‧‧Second primary light

L3‧‧‧ third primary light

T1‧‧‧ first drive element

T2‧‧‧second drive component

T3‧‧‧ third drive element

22‧‧‧Electronic layer

24‧‧‧ blocking wall

261‧‧‧First structural pattern layer

262‧‧‧Second structural pattern layer

263‧‧‧The third structural pattern layer

281‧‧‧First bottom pattern section

282‧‧‧Second bottom pattern section

283‧‧‧ Third bottom pattern part

302‧‧‧Second intermediate pattern part

303‧‧‧ Third intermediate pattern part

323‧‧‧ Third top pattern section

30‧‧‧Inorganic dielectric layer

28‧‧‧Organic Dielectric Layer

2‧‧‧Pixel structure of electroluminescent display panel

161‧‧‧First luminescent layer

162‧‧‧second luminescent layer

3‧‧‧Pixel structure of electroluminescent display panel

341‧‧‧First transparent conductive pattern layer

342‧‧‧Second upper transparent conductive pattern layer

343‧‧‧ third upper transparent conductive pattern layer

4‧‧‧Pixel structure of electroluminescent display panel

401‧‧‧First top pattern section

402‧‧‧Second top pattern section

403‧‧‧ Third top pattern section

422‧‧‧Second bottom pattern section

423‧‧‧ Third bottom pattern section

443‧‧‧The third intermediate pattern part

5‧‧‧Pixel structure of electroluminescent display panel

FIG. 1 is a schematic view showing a pixel structure of an electroluminescence display panel according to an embodiment of the present invention.

2A, 2B, 2C, 2D, and 2E are schematic views showing a method of fabricating a pixel structure of the electroluminescent display panel of Fig. 1.

FIG. 3 is a diagram showing the pixel structure of the electroluminescent display panel of the first modified embodiment of the present invention. intention.

4 is a schematic view showing a pixel structure of an electroluminescence display panel according to a second modified embodiment of the present invention.

Fig. 5 is a view showing the pixel structure of the electroluminescence display panel of the third modified embodiment of the present invention.

Figure 6 is a schematic view showing the pixel structure of the electroluminescent display panel of the fourth modified embodiment of the present invention.

The present invention will be further understood by those of ordinary skill in the art to which the present invention pertains. .

Please refer to Figure 1. FIG. 1 is a schematic view showing a pixel structure of an electroluminescence display panel according to an embodiment of the present invention. As shown in FIG. 1 , the pixel structure 1 of the electroluminescent display panel of the present embodiment is disposed on a substrate 10 , and the substrate 10 includes a first pixel region 101 , a second pixel region 102 , and a first pixel region . Three-pixel area 103. The substrate 10 may be, for example, a rigid substrate such as a glass substrate, a quartz substrate, a sapphire substrate, a germanium substrate, or a flexible substrate such as a plastic substrate, but is not limited thereto. The first pixel area 101, the second pixel area 102 and the third pixel area 103 are used to display pixel regions of different color pictures, and the first pixel area 101, the second pixel area 102 and the third area The pixel area 103 can constitute a pixel structure. For example, the first pixel area 101 can be a red pixel area for providing a red picture, and the second pixel area 102 can be a green pixel area for providing a green picture and a third pixel area. 103 can be a blue pixel area to provide a blue picture, but not limited thereto. The first pixel area 101, the second pixel area 102, and the third pixel area 103 may be pixel regions for displaying other different colors. Further, the pixel structure is not limited to being composed of three pixel regions of different colors, but may be composed of a pixel region of more colors such as four pixel regions or more pixel regions.

The pixel structure 1 of the electroluminescent display panel of the present embodiment may be a pixel structure of a top emission type electroluminescent display panel, including a first reflective electrode 121 and a second reflective electrode 122. A third reflective electrode 123, a hole layer 14, a light-emitting layer 16, and a half-transmissive semi-reflective electrode 18. The first reflective electrode 121 is disposed in the first pixel region 101 of the substrate 10, the second reflective electrode 122 is disposed in the second pixel region 102 of the substrate 10, and the third reflective electrode 123 is disposed on the third pixel of the substrate 10. In the region 103, the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 are disposed on different horizontal planes. In this embodiment, the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 may be thick metal electrodes such as silver electrodes, but not limited thereto. The material of the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 may be any conductive material having a reflective property or a laminate of a conductive material and a reflective material. The hole layer 14 is disposed on the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123, and the hole layer 14 has a flat upper surface 14S. The hole layer 14 of this embodiment may be a Hole Transport Layer, a Hole Injection Layer, or a multilayer stacking hole formed by a hole transport layer and a hole injection layer. Layer, but not limited to this. In addition, the hole layer 14 of the embodiment may include at least a first common portion 141 disposed between the first pixel region 101 and the second pixel region 102, and the first common portion 141 of the hole layer 14 is The first pixel area 101 and the second pixel area 102 are continuously distributed. In addition, the hole layer 14 of the embodiment may further include a second sharing portion 142 disposed between the second pixel region 102 and the third pixel region 103, and the second common portion 142 of the hole layer 14 is The second pixel area 102 and the third pixel area 103 are continuously distributed. In addition, the first common portion 141 and the second common portion 142 of the hole layer 14 are connected to each other, that is, the hole layer 14 is continuously distributed in the first pixel region 101, the second pixel region 102, and the third pixel. Within area 103, but not limited to this. In a variant embodiment, the hole layer 14 in the first pixel region 101 and the second pixel region 102 may be separated from the hole layer 14 in the third pixel region 103 without being connected. The light emitting layer 16 is disposed on the hole layer 14. The luminescent layer 16 of this embodiment may include a white light emitting layer disposed in the first pixel region 101, the second pixel region 102, and the third pixel region 103. It is used to produce white light. The white light emitting layer may be a single white light emitting layer or a plurality of white light emitting layers stacked by different color light emitting layers such as a red light emitting layer, a green light emitting layer and a blue light emitting layer. The transflective electrode 18 is disposed on the light emitting layer 16. In the present embodiment, the first pixel region 101, the second pixel region 102, and the third pixel region 103 share the transflective electrode 18, that is, the transflective electrode 18 is disposed in the first Within the pixel area 101, the second pixel area 102, and the third pixel area 103, but not limited thereto. The transflective electrode 18 can be a thin metal electrode, but is not limited thereto. The material of the transflective electrode 18 can be any material having semi-transparent and semi-reflective properties.

In the first pixel region 101, the first reflective electrode 121, the light-emitting layer 16, and the transflective electrode 18 may constitute a first organic electroluminescent element, and in the second pixel region 102, the second reflective electrode 122 The luminescent layer 16 and the transflective electrode 18 can constitute a second organic electroluminescent element. In the third pixel region 103, the third reflective electrode 123, the luminescent layer 16 and the transflective electrode 18 can be configured. A third organic electroluminescent device. In the present embodiment, the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 are used as an anode, and the transflective electrode 18 is used as a cathode, but not limited thereto.

In the first pixel region 101, a first micro-cavity 201 is formed between the transflective electrode 18 and the first reflective electrode 121, and is half-transparent in the second pixel region 102. A second microresonator 202 is formed between the reflective electrode 18 and the second reflective electrode 122. In the third pixel region 103, a third microresonance is formed between the transflective electrode 18 and the third reflective electrode 123. Cavity 203. The first microresonator cavity 201, the second microresonator cavity 202 and the third microresonator cavity 203 have different cavity lengths, and even if the illuminating layer 16 generates white light, the microresonance effect by optical resonance is That is, the white light is optically resonated in the first micro-resonator cavity 201, the second micro-resonator cavity 202, and the third micro-resonant cavity 203, respectively, whereby the first pixel region 101 emits a first primary color light L1, the second pixel. The area 102 will emit a second primary color light L2, and the third pixel area 103 will emit a The third primary color light L3, wherein the first primary color light L1, the second primary color light L2, and the third primary color light L3 have different wavelength ranges. For example, since the first pixel region 101 is a red pixel region, the second pixel region 102 is a green pixel region, and the third pixel region 103 is a blue pixel region, the first micro-resonance cavity 201 The resonant cavity length is greater than the resonant cavity length of the second micro resonant cavity 202, and the resonant cavity length of the second micro resonant cavity 202 is greater than the resonant cavity length of the third micro resonant cavity 203. The first primary color light L1 emitted by the first pixel region 101 is red light by the micro cavity effect, and the second primary color light L2 emitted by the second pixel region 102 is green light, and the third pixel The third primary color light L3 emitted from the region 103 is blue light. In a variant embodiment, the relationship between the length of the resonant cavity of the first micro-resonator cavity 201, the second micro-resonant cavity 202 and the third micro-resonant cavity 203 can be seen as the first pixel region 101, the second pixel region 102, and the third painting. The color of the prime zone 103 is adjusted differently. The above sections are well known to those of ordinary skill in the art and will not be described again.

The pixel structure 1 of the electroluminescent display panel of the present embodiment may further include a first driving component T1 disposed in the first pixel region 101 and electrically connected to the first reflective electrode 121 and a second driving component T2. The second pixel element 102 is electrically connected to the second reflective electrode 122 and is electrically connected to the third reflective electrode 123. The first driving element T1, the second driving element T2 and the third driving element T3 may be, for example, a thin film transistor element, but not limited thereto. In addition, in order to improve the efficiency of electron injection and transmission, the pixel structure 1 of the electroluminescent display panel of the present embodiment further selectively includes an electron layer 22 disposed on the light emitting layer 16 and the transflective electrode 18. between. The electronic layer 22 may include an electron injection layer (Electron Injection Layer), an electron transport layer (Electron Transport Layer), or a multi-layer stacked electronic layer composed of an electron transport layer and an electron injection layer, but is not limited thereto. The pixel structure 1 of the electroluminescent display panel of the present embodiment further selectively includes a barrier wall 24 disposed between adjacent pixel structures 1. For example, the first pixel region 101, the second pixel region 102, and the third pixel region 103 of the embodiment are sequentially arranged in a column direction, so the barrier wall 24 can be disposed in a pixel structure 1 Between the one pixel area 101 and the third pixel area 103 of the pixel structure 1 adjacent to the other left side, And between the third pixel region 103 of one pixel structure 1 and the first pixel region 101 of the pixel structure 1 adjacent to the other right side, but not limited thereto. In addition, a barrier wall 24 may be selectively disposed between adjacent pixel structures 1 of different columns.

The pixel structure 1 of the electroluminescent display panel of the present embodiment may further include a first structural pattern layer 261, a second structural pattern layer 262, and a third structural pattern layer 263. The first structural pattern layer 261 is disposed in the first pixel region 101 and located between the substrate 10 and the first reflective electrode 121. The second structural pattern layer 262 is disposed in the second pixel region 102 and between the substrate 10 and the second reflective electrode 122. The third structural pattern layer 263 is disposed in the third pixel region 103 and located between the substrate 10 and the third reflective electrode 123. The first structural pattern layer 261, the second structural pattern layer 262, and the third structural pattern layer 263 have different thicknesses, so that the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 are disposed at different horizontal levels. on. In addition, since the hole layer 14 located above the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 has a flat upper surface 14S, and a film layer located above the hole layer 14, such as the light-emitting layer 16, the electron layer 22 and the transflective electrode 18 have equal thicknesses in the first pixel region 101, the second pixel region 102, and the third pixel region 103, and thus have a first structural pattern layer 261 having a different thickness. The second structural pattern layer 262 and the third structural pattern layer 263 may further cause the first microresonator cavity 201, the second microresonator cavity 202, and the third microresonator cavity 203 to have different resonant cavity lengths. In this embodiment, the first structure pattern layer 261 includes a first bottom pattern portion 281, and the second structure pattern layer 262 includes one second bottom pattern portion 282 and a second intermediate pattern portion 302 stacked on each other, and the third structure. The pattern layer 263 includes one third bottom pattern portion 283, a third intermediate pattern portion 303, and a third top pattern portion 323 stacked one on another. Wherein, the first bottom pattern portion 281, the second bottom pattern portion 282 and the third bottom pattern portion 283 may have the same thickness and may be formed by patterning of the same bottom material layer, and the bottom material layer may be any material layer, for example An organic dielectric layer, an inorganic dielectric layer, a semiconductor layer, an opaque conductive layer such as a metal conductive layer, a transparent conductive layer such as an indium tin oxide (ITO) layer, or the like, but not limited thereto. Second intermediate pattern portion 302 and third intermediate The pattern portions 303 may have the same thickness and may be patterned by the same intermediate material layer, which may be any material layer, such as an organic dielectric layer, an inorganic dielectric layer, a semiconductor layer, an opaque conductive layer such as a metal conductive layer. A layer, a transparent conductive layer such as an indium tin oxide (ITO) layer, or the like, but not limited thereto. The third top pattern portion 323 may be patterned by a top material layer, which may be any material layer, such as an organic dielectric layer, an inorganic dielectric layer, a semiconductor layer, an opaque conductive layer such as a metal conductive layer, and a transparent conductive layer. The layer is, for example, an indium tin oxide (ITO) layer or the like, but is not limited thereto. It should be noted that the constituent layers of the first structural pattern layer 261, the second structural pattern layer 262, and the third structural pattern layer 263 are not limited to the above composition and materials, but may be any organic dielectric material or inorganic. Any combination of a dielectric material, an opaque conductive material, a transparent conductive material, or a semiconductor material, as long as the first reflective electrode 121, the second reflective electrode 122, and the third reflective electrode 123 are located at different levels and the first micro The resonator chamber 201, the second microresonator 202, and the third microresonator 203 may each have a different resonant cavity length.

The pixel structure of the electroluminescent display panel of the present invention is not limited to the above embodiment. Hereinafter, the pixel structure of the electroluminescent display panel according to other preferred embodiments of the present invention and a method for fabricating the same will be sequentially described, and in order to facilitate comparison of the differences between the embodiments and simplify the description, in the following embodiments. The same elements are denoted by the same reference numerals, and the differences between the embodiments are mainly described, and the repeated parts are not described again.

Please refer to Figures 2A to 2E and refer to Figure 1 together. 2A to 2E are schematic views showing a method of fabricating a pixel structure of the electroluminescence display panel of Fig. 1. As shown in FIG. 2A, a substrate 10 is provided in which a first pixel region 101, a second pixel region 102, and a third pixel region 103 are defined on the substrate 10. Next, a first driving element T1, a second driving element T2, and a third driving element T3 are formed in the first pixel region 101, the second pixel region 102, and the third pixel region 103 of the substrate 10. A layer of bottom material 28, such as an inorganic dielectric layer, is then formed over substrate 10. The inorganic dielectric layer may include, for example, a tantalum nitride layer, but is not limited thereto. The thickness of the bottom material layer 28 is, for example It can be about 2000 angstroms, but not limited to this.

As shown in FIG. 2B, the bottom material layer 28 is patterned by a lithography and etching process to form a first bottom pattern portion 281 in the first pixel region 101 and a second pixel region 102 in the first pixel region 102. The second bottom pattern portion 282 and the third bottom pattern portion 303 are formed in the third pixel region 103. Subsequently, an intermediate material layer 30 is formed on the substrate 10 and the bottom material layer 28, such as an organic dielectric layer. The organic dielectric layer may include, for example, an acryl layer or an epoxy layer, but is not limited thereto. In addition, the material of the intermediate material layer 30 may be a photosensitive material, which may be defined by an exposure and development process, but is not limited thereto. The thickness of the intermediate material layer 30 can be, for example, about 15,000 angstroms, but is not limited thereto.

As shown in FIG. 2C, an exposure and development process is then used to form a second intermediate pattern portion 302 in the second pixel region 102 and a third bottom pattern portion 303 in the third pixel region 103. Subsequently, a third top pattern portion 323 is formed on the third bottom pattern portion 303 of the third pixel region 103. The third top pattern portion 323 is, for example, a transparent conductive pattern, but is not limited thereto. The thickness of the third top pattern portion 323 may be, for example, about 150 angstroms to 750 angstroms, but is not limited thereto. Through the above process, in the first pixel region 101, the first bottom pattern portion 281 may constitute a first structural pattern layer 261, in the second pixel region 102, the second bottom pattern portion 282 and the second intermediate pattern portion. 302 may constitute a second structural pattern layer 262, and in the third pixel region 103, the third bottom pattern portion 283, the third intermediate pattern portion 303 and the third top pattern portion 323 may constitute a third structural pattern layer 263, wherein In the present embodiment, the thickness of the first structural pattern layer 261 is smaller than that of the second structural pattern layer 262, and the thickness of the second structural pattern layer 262 is smaller than the thickness of the third structural pattern layer 263.

As shown in FIG. 2D, the first reflective electrode 121, the second reflective electrode 122, the third reflective electrode 123, the barrier wall 24, and the hole layer 14 may be sequentially formed. Formed on the substrate 10 A reflective electrode layer is, for example, a highly reflective metal layer or a laminate of a conductive layer and a reflective layer, and then the reflective electrode layer is patterned to form a first reflective electrode 121, a second reflective electrode 122, and a third reflective electrode 123. Next, a barrier wall 24 may be formed on the periphery of the first pixel region 101, the second pixel region 102, and the third pixel region 103 to isolate adjacent pixels. Then, a hole layer 14 is formed in the first pixel region 101, the second pixel region 102, and the third pixel region 103 in the barrier wall 24, so that the hole layer 14 has a flat upper surface 14S. The hole layer 14 is connected to the first common portion 141 and the second common portion 142, for example, by an inkjet printing process, that is, the hole layer 14 is continuously distributed in the first pixel region. 101, within the second pixel area 102 and the third pixel area 103.

As shown in FIG. 2E, the luminescent layer 16, the electron layer 22, and the transflective electrode 18 can be sequentially formed to form the pixel structure 1 of the electroluminescent display panel of the present embodiment. Since the hole layer 14 has a flat upper surface 14S, not only the yield of the subsequent process can be improved, but also the subsequently formed light-emitting layer 16, the electron layer 22, and the transflective electrode 18 can have better flatness. Improves uniformity of illumination. In addition, in the present embodiment, the light-emitting layer 16 can be formed by, for example, evaporation, but is not limited thereto.

Please refer to Figure 3. FIG. 3 is a schematic view showing the pixel structure of the electroluminescence display panel of the first modified embodiment of the present invention. As shown in FIG. 3, unlike the first embodiment, the luminescent layer 16 of the pixel structure 2 of the electroluminescent display panel of the first variation embodiment includes a first luminescent layer 161 and a second luminescent layer 162, wherein The first luminescent layer 161 is disposed within the first pixel region 101 and the second pixel region 102, and the second luminescent layer 162 is disposed with the first pixel region 101, the second pixel region 102, and the third pixel region 103. Inside. That is, the first luminescent layer 161 and the second luminescent layer 162 are overlapped with each other in the first pixel region 101 and the second pixel region 102. The first luminescent layer 161 may include a red-green luminescent layer that produces red-green light, and the second luminescent layer 162 may include a blue luminescent layer that produces blue light. Although the first luminescent layer 161 is disposed within the first pixel region 101 and the second pixel region 102, the second luminescent layer 162 is disposed with the first pixel region 101, the second pixel region 102, and the third painting. Within the prime zone 103, but since the first microresonator cavity 201, the second microresonator cavity 202 and the third microresonator cavity 203 have different cavity lengths, the first pixel region 101 is utilized by the microresonator effect. The first primary color light L1 emitted may be red light, the second primary color light L2 emitted by the second pixel area 102 may be green light, and the third primary color light L3 emitted by the third pixel area 103 may be blue light.

Please refer to Figure 4. 4 is a schematic view showing a pixel structure of an electroluminescence display panel according to a second modified embodiment of the present invention. As shown in FIG. 4, unlike the first embodiment, the pixel structure 3 of the electroluminescent display panel of the second variation embodiment further includes a first upper transparent conductive pattern layer 341 and a second upper transparent conductive pattern layer. 342 and a third upper transparent conductive pattern layer 343. The first upper transparent conductive pattern layer 341 is disposed in the first pixel region 101 and located between the first reflective electrode 121 and the hole layer 14 . The second upper transparent conductive pattern layer 342 is disposed in the second pixel region 102 and located between the second reflective electrode 122 and the hole layer 14 . The third upper transparent conductive pattern layer 343 is disposed in the third pixel region 103 and located between the third reflective electrode 123 and the hole layer 14. The first upper transparent conductive pattern layer 341, the second upper transparent conductive pattern layer 342, and the third upper transparent conductive pattern layer 343 may be composed of the same layer of patterned transparent conductive layer such as an indium tin oxide (ITO) layer, and may have the same thickness. In another variant embodiment, the first upper transparent conductive pattern layer 341, the second upper transparent conductive pattern layer 342, and the third upper transparent conductive pattern layer 343 may have different thicknesses.

Please refer to Figure 5. Fig. 5 is a view showing the pixel structure of the electroluminescence display panel of the third modified embodiment of the present invention. As shown in FIG. 5, the stacked structure of the first structural pattern layer 261, the second structural pattern layer 262, and the third structural pattern layer 263 of the pixel structure 4 of the electroluminescent display panel of the third modified embodiment is the first The embodiments are different. In the third variant embodiment, the first structural pattern layer 261 may include a first top pattern portion 401, and the second structural pattern layer 262 may include one of the second top pattern portion 402 and the second bottom pattern portion 422 stacked on each other. The third structural pattern layer 263 may include a third top pattern portion 403, a third intermediate pattern portion 443, and a third bottom pattern portion 423 stacked on each other. First top pattern portion 401, second The top pattern portion 402 and the third top pattern portion 403 may be formed of the same layer of patterned transparent conductive layer and have the same thickness, but are not limited thereto. The second bottom pattern portion 422 and the third bottom pattern portion 423 may be formed of the same layer of patterned dielectric layers and have the same thickness, but are not limited thereto. The second bottom pattern portion 422 and the third bottom pattern portion 423 may be an inorganic dielectric layer such as a tantalum nitride layer, or an organic dielectric layer such as an acryl layer or an epoxy layer, but not limit. The third intermediate pattern portion 443 may be an inorganic dielectric layer such as a tantalum nitride layer or an organic dielectric layer such as an acryl layer or an epoxy layer, but is not limited thereto. The constituent film layers and materials of the first structural pattern layer 261, the second structural pattern layer 262, and the third structural pattern layer 263 are not limited to the above composition and materials, and may be any organic dielectric material, inorganic dielectric material, Any combination of opaque conductive materials, transparent conductive materials, or semiconductor materials. In addition, the pixel structure 4 of the electroluminescent display panel may further include a first upper transparent conductive pattern layer 341, a second upper transparent conductive pattern layer 342, and a third upper transparent conductive pattern layer 343. The first upper transparent conductive pattern layer 341 is disposed in the first pixel region 101 and located between the first reflective electrode 121 and the hole layer 14 . The second upper transparent conductive pattern layer 342 is disposed in the second pixel region 102 and located between the second reflective electrode 122 and the hole layer 14 . The third upper transparent conductive pattern layer 343 is disposed in the third pixel region 103 and located between the third reflective electrode 123 and the hole layer 14. The first upper transparent conductive pattern layer 341, the second upper transparent conductive pattern layer 342, and the third upper transparent conductive pattern layer 343 may have different thicknesses. In a variant embodiment, the first upper transparent conductive pattern layer 341, the second upper transparent conductive pattern layer 342, and the third upper transparent conductive pattern layer 343 may have the same thickness. In addition, in another variation, the first structure pattern layer 261 may not be provided with the first top pattern portion 401, the second structure pattern layer 262 may not be provided with the second top pattern portion 402, and the third structure pattern layer 263 may also be The third top pattern portion 403 may not be provided.

Please refer to Figure 6. Figure 6 is a schematic view showing the pixel structure of the electroluminescent display panel of the fourth modified embodiment of the present invention. As shown in FIG. 6, unlike the third variation embodiment, the barrier wall 24 of the pixel structure 5 of the electroluminescent display panel of the fourth variation embodiment is disposed on the second painting. The prime region 102 and the third pixel region 103 are disposed between the first pixel region 101 and the third pixel region 103 of another adjacent pixel structure. The hole layer 14 is continuously distributed in the first pixel region 101 and the second pixel region 102, and the hole layer 14 in the third pixel region 103 and the first pixel region 101 and the second pixel region 102 are The hole layer 14 is separated by the barrier wall 24 and is not connected. In addition, the luminescent layer 16 includes a first luminescent layer 161 and a second luminescent layer 162, wherein the first luminescent layer 161 is disposed within the first pixel region 101 and the second pixel region 102, and the second luminescent layer 162 is disposed. The first pixel area 101, the second pixel area 102, and the third pixel area 103 are within. That is, the first luminescent layer 161 and the second luminescent layer 162 are overlapped with each other in the first pixel region 101 and the second pixel region 102. In the fourth variant embodiment, the first light-emitting layer 161 is preferably formed by an inkjet printing process, and the barrier wall 24 can block the first light-emitting layer 161 from overflowing into the third pixel region 103, thus Avoid color mixing problems. The first luminescent layer 161 may include a red-green luminescent layer that produces red-green light, and the second luminescent layer 162 may include a blue luminescent layer that produces blue light. Although the first luminescent layer 161 is disposed within the first pixel region 101 and the second pixel region 102, the second luminescent layer 162 is disposed with the first pixel region 101, the second pixel region 102, and the third pixel region 103. However, since the first microresonator cavity 201, the second microresonator cavity 202 and the third microresonator cavity 203 have different cavity lengths, the first pixel region 101 is emitted by the micro cavity effect. The primary color light L1 may be red light, the second primary color light L2 emitted by the second pixel area 102 may be green light, and the third primary color light L3 emitted by the third pixel area 103 may be blue light.

In summary, the pixel layer of the pixel structure of the electroluminescent display panel of the present invention has a flat upper surface, and the hole layer includes at least a first common portion disposed in the first pixel region and the second pixel region. Between the first pixel region and the second pixel region, the layer layer of the subsequently formed light-emitting layer, the electron layer, and the transflective electrode have a better flatness. It can improve the uniformity of illumination. In addition, the first structural pattern layer disposed under the first reflective electrode, the second structural pattern layer disposed under the second reflective electrode, and the third structural pattern layer disposed under the third reflective electrode have different thicknesses, which may First pixel area, second pixel area, and third pixel The zones have different cavity lengths, so full color display is possible without the use of color filters.

The pixel structure of the electroluminescent display panel of the present invention is not limited to those disclosed in the above embodiments and the modified embodiments, and different structures or variations disclosed in the embodiments and the modified embodiments may be combined and matched as needed.

1‧‧‧Pixel structure of electroluminescent display panel

10‧‧‧Substrate

101‧‧‧The first picture area

102‧‧‧second picture area

103‧‧‧ Third Picture Area

121‧‧‧First reflective electrode

122‧‧‧second reflective electrode

123‧‧‧third reflective electrode

14‧‧‧ hole layer

16‧‧‧Lighting layer

18‧‧‧Semi-transflective electrode

14S‧‧‧flat upper surface

141‧‧‧First shared part

142‧‧‧Second shared part

201‧‧‧First microresonator

202‧‧‧Second microresonator

203‧‧‧ third micro-resonator

L1‧‧‧first primary color light

L2‧‧‧Second primary light

L3‧‧‧ third primary light

T1‧‧‧ first drive element

T2‧‧‧second drive element

T3‧‧‧ third drive element

22‧‧‧Electronic layer

24‧‧‧ blocking wall

261‧‧‧First structural pattern layer

262‧‧‧Second structural pattern layer

263‧‧‧The third structural pattern layer

281‧‧‧First bottom pattern section

282‧‧‧Second bottom pattern section

283‧‧‧ Third bottom pattern part

302‧‧‧Second intermediate pattern part

303‧‧‧ Third intermediate pattern part

323‧‧‧ Third top pattern section

Claims (10)

A pixel structure of an electroluminescent display panel is disposed on a substrate, the substrate includes a first pixel region, a second pixel region and a third pixel region, and the pixel of the electroluminescent display panel The structure includes: a first reflective electrode disposed in the first pixel region of the substrate; a second reflective electrode disposed in the second pixel region of the substrate; a third reflective electrode disposed on the In the third pixel region of the substrate, wherein the first reflective electrode, the second reflective electrode, and the third reflective electrode are disposed on different horizontal planes; a hole layer is disposed on the first reflective electrode, a second reflective electrode and the third reflective electrode, wherein the hole layer has a flat upper surface; a light-emitting layer is disposed on the hole layer; and a half-transmissive semi-reflective electrode is disposed on the light-emitting layer a first micro-cavity is formed between the transflective electrode and the first reflective electrode in the first pixel region, and the semi-transparent region is in the second pixel region. Forming between the semi-reflective electrode and the second reflective electrode a second micro-resonator cavity, in the third pixel region, a third micro-resonant cavity is formed between the transflective electrode and the third reflective electrode, and the first micro-resonator cavity and the second micro-resonator The resonant cavity and the third micro-resonant cavity have different cavity lengths, wherein the hole layer includes at least a first common portion disposed between the first pixel region and the second pixel region The hole layer is continuously distributed at least continuously in the first pixel region and the second pixel region. The pixel structure of the electroluminescent display panel of claim 1, further comprising a second sharing portion disposed between the second pixel region and the third pixel region, the hole layer being continuously distributed The first pixel area, the second pixel area, and the third pixel area. The pixel structure of the electroluminescent display panel of claim 1, further comprising a barrier wall disposed between the second pixel region and the third pixel region, wherein the hole layer is continuously distributed The first pixel region and the second pixel region, and the hole layer in the third pixel region is not connected to the first pixel region and the hole layer in the second pixel region. The pixel structure of the electroluminescent display panel of claim 1, further comprising: a first structural pattern layer disposed in the first pixel region and located between the substrate and the first reflective electrode; a second structural pattern layer disposed in the second pixel region and located between the substrate and the second reflective electrode; and a third structural pattern layer disposed in the third pixel region and located on the substrate Between the third reflective electrodes, wherein the first structural pattern layer, the second structural pattern layer, and the third structural pattern layer have different thicknesses, such that the first reflective electrode, the second reflective electrode, and the first The three reflective electrodes are located on different levels. The pixel structure of the electroluminescent display panel of claim 4, wherein the first structural pattern layer comprises a first bottom pattern portion, the second structural pattern layer comprising one of the second bottom pattern portions and one stacked on each other a second intermediate pattern portion including one of a third bottom pattern portion, a third intermediate pattern portion, and a third top pattern portion, the first bottom pattern portion and the second bottom pattern portion The third bottom pattern portion has the same thickness, and the second intermediate pattern portion has the same thickness as the third intermediate pattern portion. The pixel structure of the electroluminescent display panel of claim 1, wherein the luminescent layer comprises a white light emitting layer disposed in the first pixel region, the second pixel region, and the third pixel region Inside. The pixel structure of the electroluminescent display panel of claim 1, wherein the luminescent layer comprises a first luminescent layer, the first pixel region and the second pixel region are disposed, and a second illuminating a layer, the first pixel area, the second pixel area, and the third pixel area are disposed. The pixel structure of the electroluminescent display panel of claim 7, wherein the first luminescent layer comprises a red-green luminescent layer, and the second luminescent layer comprises a blue luminescent layer. The pixel structure of the electroluminescent display panel of claim 8, wherein the first luminescent layer is formed by an inkjet printing process. The pixel structure of the electroluminescent display panel of claim 1, further comprising: a first upper transparent conductive pattern layer disposed in the first pixel region and located at the first reflective electrode and the hole layer a second upper transparent conductive pattern layer disposed in the second pixel region and located between the second reflective electrode and the hole layer; and a third upper transparent conductive pattern layer disposed on the first The three pixel region is located between the third reflective electrode and the hole layer.