Pixel structure

A pixel structure, including a first semiconductor layer, a first active layer, a second semiconductor layer, a second active layer, a third semiconductor layer, and an electrode layer that are sequentially stacked, is provided. A first portion of the electrode layer is electrically connected to a first portion of the first semiconductor layer through a first opening of a first portion of the third semiconductor layer, a first opening of a first portion of the second active layer, a first opening of a first portion of the second semiconductor layer, and a first opening of a first portion of the first active layer. A second portion of the electrode layer is electrically connected to a second portion of the second semiconductor layer through a second opening of a second portion of the third semiconductor layer and a second opening of a second portion of the second active layer.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan application serial no. 110134304, filed on Sep. 15, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to a pixel structure.

Description of Related Art

The light emitting diode display panel includes a driving back plate and multiple light emitting diode elements transposed onto the driving back plate. Inheriting the characteristics of light emitting diodes, the light emitting diode display panel has advantages such as power saving, high efficiency, high brightness, and fast response time. In addition, compared to the organic light emitting diode display panel, the light emitting diode display panel has advantages such as easy color adjustment, long light emitting life, and no image burn-in. Therefore, the light emitting diode display panel is regarded as the next generation display technology.

Generally speaking, in order for the light emitting diode display panel to display a color image, the light emitting diode elements of the light emitting diode display panel include multiple first light emitting diode elements for displaying a first color, multiple second light emitting diode elements for displaying a second color, and multiple third light emitting diode elements for displaying a third color. However, the first light emitting diode elements, the second light emitting diode elements, and the third light emitting diode elements are formed by respectively using three growth substrates, and then transposed onto the driving back plate by respectively using multiple transposing actions, such that it is not easy to improve the yield, the cost, and the resolution of the light emitting diode display panel.

SUMMARY

The disclosure provides a pixel structure with good performance.

The pixel structure of the disclosure includes a first semiconductor layer, a first active layer, a second semiconductor layer, a second active layer, a third semiconductor layer, an electrode layer, and a driving back plate. The first semiconductor layer has a first portion and a second portion. The first active layer is disposed on the first semiconductor layer and has a first portion and a second portion. The first portion and the second portion of the first active layer are respectively disposed on the first portion and the second portion of the first semiconductor layer. The first portion of the first active layer has a first opening, and the first opening of the first portion of the first active layer overlaps with the first portion of the first semiconductor layer. The second semiconductor layer is disposed on the first active layer and has a first portion and a second portion. The first portion and the second portion of the second semiconductor layer are respectively disposed on the first portion and the second portion of the first active layer. The first portion of the second semiconductor layer has a first opening, and the first opening of the first portion of the second semiconductor layer overlaps with the first opening of the first portion of the first active layer. The second active layer is disposed on the second semiconductor layer and has a first portion and a second portion. The first portion and the second portion of the second active layer are respectively disposed on the first portion and the second portion of the second semiconductor layer. The first portion and the second portion of the second active layer respectively have a first opening and a second opening. The first opening of the first portion of the second active layer overlaps with the first opening of the first portion of the second semiconductor layer, and the second opening of the second portion of the second active layer overlaps with the second portion of the second semiconductor layer. The third semiconductor layer is disposed on the second active layer and has a first portion and a second portion. The first portion and the second portion of the third semiconductor layer are respectively disposed on the first portion and the second portion of the second active layer. The first portion and the second portion of the third semiconductor layer respectively have a first opening and a second opening. The first opening of the first portion of the third semiconductor layer overlaps with the first opening of the first portion of the second active layer, and the second opening of the second portion of the third semiconductor layer overlaps with the second opening of the second portion of the second active layer. The electrode layer is disposed on the third semiconductor layer and has a first portion, a second portion, and a third portion. The first portion of the electrode layer is electrically connected to the first portion of the first semiconductor layer through the first opening of the first portion of the third semiconductor layer, the first opening of the first portion of the second active layer, the first opening of the first portion of the second semiconductor layer, and the first opening of the first portion of the first active layer. The second portion of the electrode layer is electrically connected to the second portion of the second semiconductor layer through the second opening of the second portion of the third semiconductor layer and the second opening of the second portion of the second active layer, and the third portion of the electrode layer is electrically connected to the second portion of the third semiconductor layer. The first portion, the second portion, and the third portion of the electrode layer are electrically connected to the driving back plate.

In an embodiment of the disclosure, the first opening of the first portion of the second active layer and the first opening of the first portion of the third semiconductor layer further overlap with the first portion of the second semiconductor layer, the electrode layer further has a fourth portion, and the fourth portion of the electrode layer is electrically connected to the first portion of the second semiconductor layer through the first opening of the first portion of the third semiconductor layer and the first opening of the first portion of the second active layer.

In an embodiment of the disclosure, the pixel structure further includes a third active layer and a fourth semiconductor layer. The first semiconductor layer is disposed between the first active layer and the third active layer. The third active layer has a first portion and a second portion, and the first portion and the second portion of the first semiconductor layer are respectively disposed on the first portion and the second portion of the third active layer. The third active layer is disposed between the first semiconductor layer and the fourth semiconductor layer. The fourth semiconductor layer has a first portion and a second portion, and the first portion and the second portion of the third active layer are respectively disposed on the first portion and the second portion of the fourth semiconductor layer.

In an embodiment of the disclosure, the fourth semiconductor layer further has a third portion; the third active layer further has a third portion, disposed on the third portion of the fourth semiconductor layer; the first semiconductor layer further has a third portion, disposed on the third portion of the third active layer; the first active layer further has a third portion, disposed on the third portion of the first semiconductor layer; the second semiconductor layer further has a third portion, disposed on the third portion of the first active layer; the second active layer further has a third portion, disposed on the third portion of the second semiconductor layer; the third semiconductor layer further has a third portion, disposed on the third portion of the second active layer; the electrode layer further has a fifth portion, electrically connected to the third portion of the fourth semiconductor layer through a third opening of the third portion of the third semiconductor layer, a third opening of the third portion of the second active layer, a second opening of the third portion of the second semiconductor layer, a second opening of the third portion of the first active layer, a first opening of the third portion of the first semiconductor layer, and a first opening of the third portion of the third active layer.

In an embodiment of the disclosure, the electrode layer further has a sixth portion, electrically connected to the third portion of the first semiconductor layer through the third opening of the third portion of the third semiconductor layer, the third opening of the third portion of the second active layer, the second opening of the third portion of the second semiconductor layer, and the second opening of the third portion of the first active layer.

In an embodiment of the disclosure, the pixel structure further includes a first wavelength conversion pattern. The third portion of the fourth semiconductor layer is disposed between the third portion of the third active layer and the first wavelength conversion pattern. The first portion of the first active layer emits a first beam. The second portion of the second active layer emits a second beam. The third portion of the third active layer emits a third beam, and the third beam passes through the first wavelength conversion pattern to be converted into a fourth beam. The first beam, the second beam, and the fourth beam respectively have a first color, a second color, and a third color.

In an embodiment of the disclosure, the fourth semiconductor layer further has a fourth portion; the third active layer further has a fourth portion, disposed on the fourth portion of the fourth semiconductor layer; the first semiconductor layer further has a fourth portion, disposed on the fourth portion of the third active layer; the first active layer further has a fourth portion, disposed on the fourth portion of the first semiconductor layer; the second semiconductor layer further has a fourth portion, disposed on the fourth portion of the first active layer; the second active layer further has a fourth portion, disposed on the fourth portion of the second semiconductor layer; the third semiconductor layer further has a fourth portion, disposed on the fourth portion of the second active layer; the electrode layer further has a seventh portion, electrically connected to the fourth portion of the fourth semiconductor layer through a fourth opening of the fourth portion of the third semiconductor layer, a fourth opening of the fourth portion of the second active layer, a third opening of the fourth portion of the second semiconductor layer, a third opening of the fourth portion of the first active layer, a second opening of the fourth portion of the first semiconductor layer, and a second opening of the fourth portion of the third active layer.

In an embodiment of the disclosure, the electrode layer further has an eighth portion, electrically connected to the fourth portion of the first semiconductor layer through the fourth opening of the fourth portion of the third semiconductor layer, the fourth opening of the fourth portion of the second active layer, the third opening of the fourth portion of the second semiconductor layer, and the third opening of the fourth portion of the first active layer.

In an embodiment of the disclosure, the pixel structure further includes a second wavelength conversion pattern. The fourth portion of the fourth semiconductor layer is disposed between the fourth portion of the third active layer and the second wavelength conversion pattern. The first portion of the first active layer emits a first beam. The second portion of the second active layer emits a second beam. The fourth portion of the third active layer emits a fifth beam, and the fifth beam passes through the second wavelength conversion pattern to be converted into a sixth beam. The first beam, the second beam, and the sixth beam respectively have a first color, a second color, and a fourth color.

In an embodiment of the disclosure, the pixel structure further includes a first wavelength conversion pattern, disposed in the third opening of the third portion of the third semiconductor layer, the third opening of the third portion of the second active layer, the second opening of the third portion of the second semiconductor layer, and the second opening of the third portion of the first active layer. The first portion of the first active layer emits a first beam, the second portion of the second active layer emits a second beam, the third portion of the third active layer emits a third beam, the third beam passes through the first wavelength conversion pattern to be converted into a fourth beam, and the first beam, the second beam, and the fourth beam respectively have a first color, a second color, and a third color.

In an embodiment of the disclosure, the first portion of the first semiconductor layer and the second portion of the first semiconductor layer are directly connected, the first portion of the first active layer and the second portion of the first active layer are directly connected, the first portion of the second semiconductor layer and the second portion of the second semiconductor layer are directly connected, the first portion of the second active layer and the second portion of the second active layer are directly connected, and the first portion of the third semiconductor layer and the second portion of the third semiconductor layer are directly connected.

In an embodiment of the disclosure, the first portion of the electrode layer has a surface facing away from the first semiconductor layer, the surface of the first portion of the electrode layer and the first semiconductor layer have a first distance, the second portion of the electrode layer has a surface facing away from the first semiconductor layer, the surface of the second portion of the electrode layer and the first semiconductor layer have a second distance, the third portion of the electrode layer has a surface facing away from the first semiconductor layer, the surface of the third portion of the electrode layer and the first semiconductor layer have a third distance, and the first distance, the second distance, and the third distance are substantially equal.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

Reference will now be made in detail to the exemplary embodiments of the disclosure, and examples of the exemplary embodiments are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and description to indicate the same or similar parts.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “connected to” another element, the layer, film, region, or substrate may be directly on or connected to the another element or there may be an intermediate element. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element, there is no intermediate element. As used herein, “connection” may refer to physical and/or electrical connection. Furthermore, for “electrical connection” or “coupling”, there may be another element between two elements.

As used herein, “about”, “approximately”, or “substantially” includes a stated value and an average value within an acceptable range of deviation from a specific value determined by persons skilled in the art, considering specific amounts of the measurement in question and measurement-related errors (that is, the limitation of the measurement system). For example, “about” may mean within one or more standard deviations or within ±30%, ±20%, ±10%, or ±5% of the stated value. Furthermore, a more acceptable range of deviation or standard deviation may be selected for “about”, “approximately”, or “substantially” used herein according to optical properties, etching properties, or other properties, instead of using one standard deviation for all properties.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by persons skilled in the art to which the disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in related technologies and the context of the disclosure, and will not be interpreted as having idealized or overly formal meanings, unless explicitly defined herein.

FIG.1is a schematic cross-sectional view of a pixel structure10according to an embodiment of the disclosure.FIG.2is a schematic top view of the pixel structure10according to an embodiment of the disclosure.FIG.1corresponds to a section line I-I′ ofFIG.2.FIG.2omits a first wavelength conversion pattern401ofFIG.1.

Please refer toFIG.1. The pixel structure10includes a first semiconductor layer130, a first active layer140, a second semiconductor layer150, a second active layer160, a third semiconductor layer170, and an electrode layer190. The first active layer140is disposed on the first semiconductor layer130. The second semiconductor layer150is disposed on the first active layer140. The second active layer160is disposed on the second semiconductor layer150. The third semiconductor layer170is disposed on the second active layer160. The electrode layer190is disposed on the third semiconductor layer170.

The first semiconductor layer130has a first portion131and a second portion132. The first active layer140has a first portion141and a second portion142, which are respectively disposed on the first portion131and the second portion132of the first semiconductor layer130. The first portion141of the first active layer140has a first opening140a, and the first opening140aoverlaps with the first portion131of the first semiconductor layer130. The second semiconductor layer150has a first portion151and a second portion152, which are respectively disposed on the first portion141and the second portion142of the first active layer140. The first portion151of the second semiconductor layer150has a first opening150a, and the first opening150aoverlaps with the first opening140a.

The second active layer160has a first portion161and a second portion162, which are respectively disposed on the first portion151and the second portion152of the second semiconductor layer150. The first portion161and the second portion162of the second active layer160respectively have a first opening160aand a second opening160b. The first opening160aoverlaps with the first opening150a. The second opening160boverlaps with the second portion152of the second semiconductor layer150. The third semiconductor layer170has a first portion171and a second portion172, which are respectively disposed on the first portion161and the second portion162of the second active layer160. The first portion171and the second portion172of the third semiconductor layer170respectively have a first opening170aand a second opening170b. The first opening170aoverlaps with the first opening160a, and the second opening170boverlaps with the second opening160b.

The electrode layer190has a first portion191, a second portion192, and a third portion193. The first portion191of the electrode layer190is electrically connected to the first portion131of the first semiconductor layer130through the first opening170aof the first portion171of the third semiconductor layer170, the first opening160aof the first portion161of the second active layer160, the first opening150aof the first portion151of the second semiconductor layer150, and the first opening140aof the first portion141of the first active layer140. The second portion192of the electrode layer190is electrically connected to the second portion152of the second semiconductor layer150through the second opening170bof the second portion172of the third semiconductor170and the second opening160bof the second portion162of the second active layer160. The third portion193of the electrode layer190is electrically connected to the second portion172of the third semiconductor layer170. The first portion191, the second portion192, and the third portion193of the electrode layer190are electrically connected to the driving back plate200.

In the embodiment, the first opening160aof the first portion161of the second active layer160and the first opening170aof the first portion171of the third semiconductor layer170further overlap with the first portion151of the second semiconductor layer150. The electrode layer190further has a fourth portion194. The fourth portion194is electrically connected to the first portion151of the second semiconductor layer150through the first opening170aof the first portion171of the third semiconductor layer170and the first opening160aof the first portion161of the second active layer160. The fourth portion194of the electrode layer190is electrically connected to the driving back plate200.

In the embodiment, the pixel structure10may further optionally include a third active layer120and a fourth semiconductor layer110. The first semiconductor layer130is disposed between the first active layer140and the third active layer120. The third active layer120is disposed between the first semiconductor layer130and the fourth semiconductor layer110. In the embodiment, the fourth semiconductor layer110, the third active layer120, the first semiconductor layer130, the first active layer140, the second semiconductor layer150, the second active layer160, the third semiconductor layer170, and the electrode layer190are sequentially stacked along a direction z perpendicular to the driving back plate200.

In the embodiment, the third active layer120has a first portion121and a second portion122. The first portion131and the second portion132of the first semiconductor layer130are respectively disposed on the first portion121and the second portion122of the third active layer120. The fourth semiconductor layer110has a first portion111and a second portion112, and the first portion121and the second portion122of the third active layer120are respectively disposed on the first portion111and the second portion112of the fourth semiconductor layer110.

In the embodiment, the fourth semiconductor layer110further has a third portion113. The third active layer120further has a third portion123, which is disposed on the third portion113of the fourth semiconductor layer110. The first semiconductor layer130further has a third portion133, which is disposed on the third portion123of the third active layer120. The first active layer140further has a third portion143, which is disposed on the third portion133of the first semiconductor layer130. The second semiconductor layer150further has a third portion153, which is disposed on the third portion143of the first active layer140. The second active layer160further has a third portion163, which is disposed on the third portion153of the second semiconductor layer150. The third semiconductor layer170further has a third portion173, which is disposed on the third portion163of the second active layer160.

In the embodiment, the electrode layer190further has a fifth portion195, which is electrically connected to the third portion113of the fourth semiconductor layer110through a third opening170cof the third portion173of the third semiconductor layer170, a third opening160cof the third portion163of the second active layer160, a second opening150bof the third portion153of the second semiconductor layer150, a second opening140bof the third portion143of the first active layer140, a first opening130aof the third portion133of the first semiconductor layer130, and a first opening120aof the third portion123of the third active layer120. The fifth portion195of the electrode layer190is electrically connected to the driving back plate200.

In the embodiment, the electrode layer190further has a sixth portion196, which is electrically connected to the third portion133of the first semiconductor layer130through the third opening170cof the third portion173of the third semiconductor layer170, the third opening160cof the third portion163of the second active layer160, the second opening150bof the third portion153of the second semiconductor layer150, and the second opening140bof the third portion143of the first active layer140. The sixth portion196of the electrode layer190is electrically connected to the driving back plate200.

In the embodiment, the pixel structure10further includes an insulating layer180, wherein the fourth semiconductor layer110, the third active layer120, the first semiconductor layer130, the first active layer140, the second semiconductor layer150, the second active layer160, the third semiconductor layer170, the insulating layer180, and the electrode layer190are sequentially stacked along the direction z perpendicular to the driving back plate200.

In the embodiment, the insulating layer180has a first portion181, which is disposed on the first portion171of the third semiconductor layer170. A side wall171sof the first portion171of the third semiconductor layer170defines the first opening170aof the first portion171of the third semiconductor layer170. A side wall161sof the first portion161of the second active layer160defines the first opening160aof the first portion161of the second active layer160. A side wall151sof the first portion151of the second semiconductor layer150defines the first opening150aof the first portion151of the second semiconductor layer150. A side wall141sof the first portion141of the first active layer140defines the first opening140aof the first portion141of the first active layer140. The first portion181of the insulating layer180is further disposed on the side walls171s,161s,151s, and141s, so that when the first portion191of the electrode layer190extends into the first openings170a,160a,150a, and140ato be electrically connected to the first portion131of the first semiconductor layer130, the first portion191does not contact the third semiconductor layer170, the second active layer160, the second semiconductor layer150, and the first active layer140, and when the fourth portion194of the electrode layer190extends into the first openings170aand160ato be electrically connected to the first portion151of the second semiconductor layer150, the fourth portion194does not contact the third semiconductor layer170and the second active layer160.

In the embodiment, the insulating layer180further has a second portion182, which is disposed on the second portion172of the third semiconductor layer170. A side wall172sof the second portion172of the third semiconductor layer170defines the second opening170bof the second portion172of the third semiconductor layer170. A side wall162sof the second portion162of the second active layer160defines the second opening160bof the second portion162of the second active layer160. The second portion182of the insulating layer180is further disposed on the side walls172sand162s, so that when the second portion192of the electrode layer190extends into the second openings170band160bto be electrically connected to the second portion152of the second semiconductor layer150, the second portion192does not contact the third semiconductor layer170and the second active layer160.

In the embodiment, the insulating layer180further has a third portion183, which is disposed on the third portion173of the third semiconductor layer170. A side wall173sof the third portion173of the third semiconductor layer170defines the third opening170cof the third portion173of the third semiconductor layer170. A side wall163sof the third portion163of the second active layer160defines the third opening160cof the third portion163of the second active layer160. A side wall153sof the third portion153of the second semiconductor layer150defines the second opening150bof the third portion153of the second semiconductor layer150. A side wall143sof the third portion143of the first active layer140defines the second opening140bof the third portion143of the first active layer140. A side wall133sof the third portion133of the first semiconductor layer130defines the first opening130aof the third portion133of the first semiconductor layer130. A side wall123sof the third portion123of the third active layer120defines the first opening120aof the third portion123of the third active layer120. The third portion183of the insulating layer180is further disposed on the side walls173s,163s,153s,143s,133s, and123s, so that when the fifth portion195of the electrode layer190extends into the third opening170c, the third opening160c, the second opening150b, the second opening140b, the first opening130a, and the first opening120ato be electrically connected to the third portion113of the fourth semiconductor layer110, the fifth portion195does not contact the third semiconductor layer170, the second active layer160, the second semiconductor layer150, the first active layer140, the first semiconductor layer130, and the third active layer120, and when the sixth portion196of the electrode layer190extends into the third opening170c, the third opening160c, the second opening150b, and the second opening140bto be electrically connected to the third portion133of the first semiconductor layer130, the sixth portion196does not contact the third semiconductor layer170, the second active layer160, the second semiconductor layer150, and the first active layer140.

Please refer toFIG.1andFIG.2. In the embodiment, the first portion111of the fourth semiconductor layer110, the first portion121of the third active layer120, the first portion131of the first semiconductor layer130, the first portion141of the first active layer140, the first portion151of the second semiconductor layer150, the first portion161of the second active layer160, the first portion171of the third semiconductor layer170, the first portion181of the insulating layer180, and the first portion191and the fourth portion194of the electrode layer190may form a first light emitting element LED-1.

In the embodiment, the second portion112of the fourth semiconductor layer110, the second portion122of the third active layer120, the second portion132of the first semiconductor layer130, the second portion142of the first active layer140, the second portion152of the second semiconductor layer150, the second portion162of the second active layer160, the second portion172of the third semiconductor layer170, the second portion182of the insulating layer180, and the second portion192and the third portion193of the electrode layer190may form a second light emitting element LED-2.

In the embodiment, the third portion113of the fourth semiconductor layer110, the third portion123of the third active layer120, the third portion133of the first semiconductor layer130, the third portion143of the first active layer140, the third portion153of the second semiconductor layer150, the third portion163of the second active layer160, the third portion173of the third semiconductor layer170, the third portion183of the insulating layer180, and the fifth portion195and the sixth portion196of the electrode layer190may form a third light emitting element LED-3.

In the embodiment, the pixel structure10further includes a first wavelength conversion pattern401, wherein the third portion113of the fourth semiconductor layer110is disposed between the third portion123of the third active layer120and the first wavelength conversion pattern401. For example, in the embodiment, the first wavelength conversion pattern401may include at least one type of phosphor or a combination of a quantum dot material and a color filter layer, but the disclosure is not limited thereto.

In the embodiment, the driving back plate200may enable the first portion141of the first active layer140of the first light emitting element LED-1to emit a first beam L1through the first portion191and the fourth portion194of the electrode layer190. The driving back plate200may enable the second portion162of the second active layer160of the second light emitting element LED-2to emit a second beam L2through the second portion192and the third portion193of the electrode layer190. The driving back plate200may enable the third portion123of the third active layer120of the third light emitting element LED-3to emit a third beam L3through the fifth portion195and the sixth portion196of the electrode layer190. The third beam L3may pass through the first wavelength conversion pattern401to be converted into a fourth beam L4. The first beam L1, the second beam L2, and the fourth beam L4respectively have different first color, second color, and third color.

For example, in the embodiment, the first active layer140is, for example, a first multiple quantum well layer that may emit blue light. The second active layer160is, for example, a second multiple quantum well layer that may emit green light. The third active layer120is, for example, a third multiple quantum well layer that may emit ultraviolet light. The first wavelength conversion pattern401may convert ultraviolet light into red light. The first beam L1emitted by the first light emitting element LED-1may be blue light. The second beam L2emitted by the second light emitting element LED-2may be green light. The fourth beam L4converted from the third beam L3emitted by the third light emitting element LED-3may be red light. In other words, in the embodiment, the first color of the first beam L1, the second color of the second beam L2, and the third color of the fourth beam L4may respectively be blue, green, and red, but the disclosure is not limited thereto.

In addition, in the embodiment, the fourth semiconductor layer110, the first semiconductor layer130, the second semiconductor layer150, and the third semiconductor layer170are, for example, respectively a first-type semiconductor layer, a second-type semiconductor layer, a first-type semiconductor layer, and a second-type semiconductor layer. One of the first-type semiconductor layer and the second-type semiconductor layer is an n-type semiconductor, and the other one of the first-type semiconductor layer and the second-type semiconductor layer is a p-type semiconductor. One of the first portion191and the fourth portion194of the electrode layer190of the first light emitting element LED-1is an anode of the first light emitting element LED-1, and the other one of the first portion191and the fourth portion194of the electrode layer190of the first light emitting element LED-1is a cathode of the first light emitting element LED-1. One of the second portion192and the third portion193of the electrode layer190of the second light emitting element LED-2is an anode of the second light emitting element LED-2, and the other one of the second portion192and the third portion193of the electrode layer190of the second light emitting element LED-2is a cathode of the second light emitting element LED-2. One of the fifth portion195and the sixth portion196of the electrode layer190of the third light emitting element LED-3is an anode of the third light emitting element LED-3, and the other one of the fifth portion195and the sixth portion196of the electrode layer190of the third light emitting element LED-3is a cathode of the third light emitting element LED-3, but the disclosure is not limited thereto.

It is worth mentioning that during the manufacturing process of the pixel structure10, a fourth semiconductor material layer (not shown), a third semiconductor material layer (not shown), a first semiconductor material layer (not shown), a first active material layer (not shown), a second semiconductor material layer (not shown), a second active material layer (not shown), and a third semiconductor material layer (not shown) are sequentially epitaxially grown on the same growth substrate (not shown). Then, the fourth semiconductor material layer, the third semiconductor material layer, the first semiconductor material layer, the first active material layer, the second semiconductor material layer, the second active material layer, and the third semiconductor material layer are patterned to form the fourth semiconductor layer110the third active layer120, the first semiconductor layer130, the first active layer140, the second semiconductor layer150, the second active layer160, and the third semiconductor layer170. Then, the insulating layer180and the electrode layer190are sequentially formed on the third semiconductor layer170, thereby completing the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3.

The first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3are formed on the same growth substrate (not shown). Therefore, the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3may be transposed onto the driving back plate200in the same transposing action, instead of using multiple transposing actions to respectively transpose the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3for emitting different colors of the first beam L1, the second beam L2, and the third beam L3onto the driving back plate200. As such, the number of transpositions required to form the pixel structure10may be reduced. More importantly, a spacing P between the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3is no longer limited by the accuracy of the transposing action, thereby improving the resolution of a display device including the pixel structure10.

Please refer toFIG.1. In the embodiment, the first portion191of the electrode layer190has a surface191afacing away from the first semiconductor layer130. The surface191aof the first portion191of the electrode layer190and the first semiconductor layer130have a first distance H1. The second portion192of the electrode layer190has a surface192afacing away from the first semiconductor layer130. The surface192aof the second portion192of the electrode layer190and the first semiconductor layer130have a second distance H2. The third portion193of the electrode layer190has a surface193afacing away from the first semiconductor layer130. The surface193aof the third portion193of the electrode layer190and the first semiconductor layer130have a third distance H3. The fourth portion194of the electrode layer190has a surface194afacing away from the first semiconductor layer130. The surface194aof the fourth portion194of the electrode layer190and the first semiconductor layer130have a fourth distance H4. The fifth portion195of the electrode layer190has a surface195afacing away from the first semiconductor layer130. The surface195aof the fifth portion195of the electrode layer190and the first semiconductor layer130have a fifth distance H5. The sixth portion196of the electrode layer190has a surface196afacing away from the first semiconductor layer130. The surface196aof the sixth portion196of the electrode layer190and the first semiconductor layer130have a sixth distance H6.

In the embodiment, after completing the fourth semiconductor layer110, the third active layer120, the first semiconductor layer130, the first active layer140, the second semiconductor layer150, the second active layer160, and the third semiconductor layer170that are sequentially stacked, the electrode layer190is formed on the third semiconductor layer170. Therefore, the first distance H1of the surface191aof the first portion191of the electrode layer190and the first semiconductor layer130, the second distance H2of the surface192aof the second portion192of the electrode layer190and the first semiconductor layer130, the third distance H3of the surface193aof the third portion193of the electrode layer190and the first semiconductor layer130, the fourth distance H4of the surface194aof the fourth portion194of the electrode layer190and the first semiconductor layer130, the fifth distance H5of the surface195aof the fifth portion195of the electrode layer190and the first semiconductor layer130, and the sixth distance H6of the surface196aof the sixth portion196of the electrode layer190and the first semiconductor layer130may be substantially equal. The substantially equal first distance H1, second distance H2, third distance H3, fourth distance H4, fifth distance H5, and sixth distance H6contribute to the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting device LED-3being simultaneously transposed onto the driving back plate200and electrically connected to the driving back plate200.

In the embodiment, the driving back plate200may include a substrate (not shown) and a first sub-pixel driving circuit (not shown), a second sub-pixel driving circuit (not shown), and a third sub-pixel driving circuit (not shown) disposed on the substrate. Each of the first sub-pixel driving circuit, the second sub-pixel driving circuit, and the third sub-pixel driving circuit may include a data line (not shown), a scan line (not shown), a power line (not shown), a common line (not shown), a first transistor (not shown), a second transistor (not shown), and a capacitor (not shown). A first terminal of the first transistor is electrically connected to the data line. A control terminal of the first transistor is electrically connected to the scan line. A second terminal of the first transistor is electrically connected to a control terminal of the second transistor. A first terminal of the second transistor is electrically connected to the power line. The capacitor is electrically connected to the second terminal of the first transistor and the first terminal of the second transistor. The first portion191and the fourth portion194of the electrode layer190of the first light emitting element LED-1may be electrically connected to a second terminal and a common line of the second transistor of the first sub-pixel driving circuit. The second portion192and the third portion193of the electrode layer190of the second light emitting element LED-2may be electrically connected to the second terminal and the common line of the second transistor of the second sub-pixel driving circuit. The fifth portion195and the sixth portion196of the electrode layer190of the third light emitting element LED-3may be electrically connected to the second terminal and the common line of the second transistor of the third sub-pixel driving circuit. However, the disclosure is not limited thereto.

It must be noted here that the following embodiments continue to use the reference numerals and some content of the foregoing embodiment, wherein the same reference numerals are adopted to represent the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted parts, reference may be made to the foregoing embodiment, which will not be repeated in the following embodiments.

FIG.3is a schematic cross-sectional view of a pixel structure10A according to an embodiment of the disclosure.FIG.4is a schematic top view of the pixel structure10A according to an embodiment of the disclosure.FIG.3corresponds to a section line II-II′ and a section line III-III′ ofFIG.4.FIG.4omits the first wavelength conversion pattern401ofFIG.1.

The pixel structure10A ofFIG.3andFIG.4is similar to the pixel structure10ofFIG.1andFIG.2, and the difference between the two is that the pixel structure10A ofFIG.3andFIG.4further includes a fourth light emitting element LED-4and a second wavelength conversion pattern402.

Please refer toFIG.3. In the embodiment, the fourth semiconductor layer110further has a fourth portion114. The third active layer120further has a fourth portion124, which is disposed on the fourth portion114of the fourth semiconductor layer110. The first semiconductor layer130further has a fourth portion134, which is disposed on the fourth portion124of the third active layer120. The first active layer140further has a fourth portion144, which is disposed on the fourth portion134of the first semiconductor layer130. The second semiconductor layer150further has a fourth portion154, which is disposed on the fourth portion144of the first active layer140. The second active layer160further has a fourth portion164, which is disposed on the fourth portion154of the second semiconductor layer150. The third semiconductor layer170further has a fourth portion174, which is disposed on the fourth portion164of the second active layer160.

In the embodiment, the electrode layer190further has a seventh portion197, which is electrically connected to the fourth portion114of the fourth semiconductor layer110through a fourth opening170dof the fourth portion174of the third semiconductor layer170, a fourth opening160dof the fourth portion164of the second active layer160, a third opening150cof the fourth portion154of the second semiconductor layer150, a third opening140cof the fourth portion144of the first active layer140, a second opening130bof the fourth portion134of the first semiconductor layer130, and a second opening120bof the fourth portion124of the third active layer120. The seventh portion197of the electrode layer190is electrically connected to the driving back plate200.

In the embodiment, the electrode layer190further has an eighth portion198, which is electrically connected to the fourth portion134of the first semiconductor layer130through the fourth opening170dof the fourth portion174of the third semiconductor layer170, the fourth opening160dof the fourth portion164of the second active layer160, the third opening150cof the fourth portion154of the second semiconductor layer150, and the third opening140cof the fourth portion144of the first active layer140. The eighth portion198of the electrode layer190is electrically connected to the driving back plate200.

In the embodiment, the insulating layer180further has a fourth portion184, which is disposed on the fourth portion174of the third semiconductor layer170. A side wall174sof the fourth portion174of the third semiconductor layer170defines the fourth opening170dof the fourth portion174of the third semiconductor layer170. A side wall164sof the fourth portion164of the second active layer160defines the fourth opening160dof the fourth portion164of the second active layer160. A side wall154sof the fourth portion154of the second semiconductor layer150defines the third opening150cof the fourth portion154of the second semiconductor layer150. A side wall144sof the fourth portion144of the first active layer140defines the third opening140cof the fourth portion144of the first active layer140. A side wall134sof the fourth portion134of the first semiconductor layer130defines the second opening130bof the fourth portion134of the first semiconductor layer130. A side wall124sof the fourth portion124of the third active layer120defines the second opening120bof the fourth portion124of the third active layer120. The fourth portion184of the insulating layer180is further disposed on the side walls174s,164s,154s,144s,134s, and124s, so that when the seventh portion197of the electrode layer190extends into the fourth opening170d, the fourth opening160d, the third opening150c, the third opening140c, the second opening130b, and the second opening120bto be electrically connected to the fourth portion114of the fourth semiconductor layer110, the seventh portion197does not contact the third semiconductor layer170, the second active layer160, the second semiconductor layer150, the first active layer140, the first semiconductor layer130, and the third active layer120, and when the eighth portion198of the electrode layer190extends into the fourth opening170d, the fourth opening160d, the third opening150c, and the third opening140cto be electrically connected to the fourth portion134of the first semiconductor layer130, the eighth portion198does not contact the third semiconductor layer170, the second active layer160, the second semiconductor layer150, and the first active layer140.

Please refer toFIG.3andFIG.4. In the embodiment, the fourth portion114of the fourth semiconductor layer110, the fourth portion124of the third active layer120, the fourth portion134of the first semiconductor layer130, the fourth portion144of the first active layer140, the fourth portion154of the second semiconductor layer150, the fourth portion164of the second active layer160, the fourth portion174of the third semiconductor layer170, the fourth portion184of the insulating layer180, the seventh portion197and the eighth portion198of the electrode layer190may form the fourth light emitting element LED-4.

In the embodiment, the pixel structure10A further includes the second wavelength conversion pattern402, wherein the fourth portion114of the fourth semiconductor layer110is disposed between the fourth portion124of the third active layer120and the second wavelength conversion pattern402. For example, in the embodiment, the second wavelength conversion pattern402may include at least one type of phosphor or a combination of a quantum dot material and a color filter layer, but the disclosure is not limited thereto.

In the embodiment, the driving back plate200may enable the first portion141of the first active layer140of the first light emitting element LED-1to emit the first beam L1through the first portion191and the fourth portion194of the electrode layer190. The driving back plate200may enable the second portion162of the second active layer160of the second light emitting element LED-2to emit the second beam L2through the second portion192and the third portion193of the electrode layer190. The driving back plate200may enable the third portion123of the third active layer120of the third light emitting element LED-3to emit the third beam L3through the fifth portion195and the sixth portion196of the electrode layer190. The third beam L3passes through the first wavelength conversion pattern401to be converted into the fourth beam L4. The fourth portion124of the third active layer120of the fourth light emitting element LED-4emits a fifth beam L5. The fifth beam L5passes through the second wavelength conversion pattern402to be converted into a sixth beam L6. The first beam L1, the second beam L2, the fourth beam L4, and the sixth beam L6respectively have the first color, the second color, the third color, and a fourth color.

For example, in the embodiment, the first active layer140is, for example, the first multiple quantum well layer that may emit blue light. The second active layer160is, for example, the second multiple quantum well layer that may emit green light. The third active layer120is, for example, the third multiple quantum well layer that may emit ultraviolet light. The first wavelength conversion pattern401may convert ultraviolet light into red light. The second wavelength conversion pattern402may convert ultraviolet light into white light. The first beam L1emitted by the first light emitting element LED-1may be blue light. The second beam L2emitted by the second light emitting element LED-2may be green light. The fourth beam L4converted from the third beam L3emitted by the third light emitting element LED-3may be red light. The sixth beam L6converted from the fifth beam L5emitted by the fourth light emitting element LED-4may be white light. In other words, the first color of the first beam L1, the second color of the second beam L2, the third color of the fourth beam L4, and the fourth color of the sixth beam L6may respectively be blue, green, red, and white, but the disclosure is not limited thereto.

In the embodiment, using the fourth light emitting element LED-4and the second wavelength conversion pattern402enables the pixel structure10A to be more capable of emitting white light, so that a display device including the pixel structure10A can save power.

Please refer toFIG.3. In the embodiment, the first portion191of the electrode layer190has the surface191afacing away from the first semiconductor layer130. The surface191aof the first portion191of the electrode layer190and the first semiconductor layer130have the first distance H1. The second portion192of the electrode layer190has the surface192afacing away from the first semiconductor layer130. The surface192aof the second portion192of the electrode layer190and the first semiconductor layer130have the second distance H2. The third portion193of the electrode layer190has the surface193afacing away from the first semiconductor layer130. The surface193aof the third portion193of the electrode layer190and the first semiconductor layer130have the third distance H3. The fourth portion194of the electrode layer190has the surface194afacing away from the first semiconductor layer130. The surface194aof the fourth portion194of the electrode layer190and the first semiconductor layer130have the fourth distance H4. The fifth portion195of the electrode layer190has the surface195afacing away from the first semiconductor layer130. The surface195aof the fifth portion195of the electrode layer190and the first semiconductor layer130have the fifth distance H5. The sixth portion196of the electrode layer190has the surface196afacing away from the first semiconductor layer130. The surface196aof the sixth portion196of the electrode layer190and the first semiconductor layer130have the sixth distance H6. The seventh portion197of the electrode layer190has a surface197afacing away from the first semiconductor layer130. The surface197aof the seventh portion197of the electrode layer190and the first semiconductor layer130have a seventh distance H7. The eighth portion198of the electrode layer190has a surface198afacing away from the first semiconductor layer130. The surface198aof the eighth portion198of the electrode layer190and the first semiconductor layer130have an eighth distance H8.

In the embodiment, after completing the fourth semiconductor layer110, the third active layer120, the first semiconductor layer130, the first active layer140, the second semiconductor layer150, the second active layer160, and the third semiconductor layer170that are sequentially stacked, the electrode layer190is formed on the third semiconductor layer170. Therefore, the first distance H1of the surface191aof the first portion191of the electrode layer190and the first semiconductor layer130, the second distance H2of the surface192aof the second portion192of the electrode layer190and the first semiconductor layer130, the third distance H3of the surface193aof the third portion193of the electrode layer190and the first semiconductor layer130, the fourth distance H4of the surface194aof the fourth portion194of the electrode layer190and the first semiconductor layer130, the fifth distance H5of the surface195aof the fifth portion195of the electrode layer190and the first semiconductor layer130, the sixth distance H6of the surface196aof the sixth portion196of the electrode layer190and the first semiconductor layer130, the seventh distance H7of the surface197aof the seventh portion197of the electrode layer190and the first semiconductor layer130, and the eighth distance H8of the surface198aof the eighth portion198of the electrode layer190and the first semiconductor layer130may be substantially equal.

FIG.5is a schematic cross-sectional view of a pixel structure10B according to an embodiment of the disclosure.FIG.6is a schematic top view of the third light emitting element LED-3and the first wavelength conversion pattern401ofFIG.5.

The pixel structure10B of the embodiment is similar to the pixel structure10of the foregoing embodiment, and the difference between the two is that the position of the first wavelength conversion pattern401of the pixel structure10B of the embodiment is different from the position of the first wavelength conversion pattern401of the pixel structure10of the foregoing embodiment.

Please refer toFIG.5andFIG.6. Specifically, in the embodiment, the first wavelength conversion pattern401is disposed in the third opening170cof the third portion173of the third semiconductor layer170, the third opening160cof the third portion163of the second active layer160, the second opening150bof the third portion153of the second semiconductor layer150, and the second opening140bof the third portion143of the first active layer140.

From another perspective, in the embodiment, the third opening170cof the third portion173of the third semiconductor layer170, the third opening160cof the third portion163of the second active layer160, the second opening150bof the third portion153of the second semiconductor layer150, and the second opening140bof the third portion143of the first active layer140overlap. The third portion173of the third semiconductor layer170having the third opening170c, the third portion163of the second active layer160having the third opening160c, the third portion153of the second semiconductor layer150having the second opening150b, and the third portion143of the first active layer140having the second opening140bmay be stacked into a wall structure W, and the first wavelength conversion pattern401is disposed in the wall structure W.

In the embodiment, the first wavelength conversion pattern401may be further optionally disposed in the first opening130aof the third portion133of the first semiconductor layer130and the first opening120aof the third portion123of the third active layer120. In the embodiment, the wall structure W further includes the third portion133of the first semiconductor layer130having the first opening130aand the third portion123of the third active layer120having the first opening120a, and the first wavelength conversion pattern401may be disposed in the wall structure W formed by stacking the third portion123of the third active layer120, the third portion133of the first semiconductor layer130, the third portion143of the first active layer140, the third portion153of the second semiconductor layer150, the third portion163of the second active layer160, and the third portion173of the third semiconductor layer170.

FIG.7is a schematic cross-sectional view of a pixel structure10C according to an embodiment of the disclosure.

The pixel structure10C ofFIG.7is similar to the pixel structure10ofFIG.1, and the difference between the two is that a first light emitting element LED-1′, a second light emitting element LED-2′, and a third light emitting element LED-3′ ofFIG.7are different from the first light emitting element LED-1, the second light emitting element LED-2, and the third light emitting element LED-3ofFIG.1.

Please refer toFIG.1andFIG.7. Specifically, the first light emitting element LED-1′ ofFIG.7does not include the first portion121of the third active layer120and the first portion111of the fourth semiconductor layer110of the first light emitting element LED-1ofFIG.1, and the second light emitting element LED-2′ ofFIG.7does not include the second portion122of the third active layer120and the second portion112of the fourth semiconductor layer110of the second light emitting element LED-2ofFIG.1.

Please refer toFIG.7. In the embodiment, the first portion131of the first semiconductor layer130of the first light emitting element LED-1′ and the second portion132of the first semiconductor layer130of the second light emitting element LED-2′ are directly connected. The first portion141of the first active layer140of the first light emitting element LED-1′ and the second portion142of the first active layer140of the second light emitting element LED-2′ are directly connected. The first portion151of the second semiconductor layer150of the first light emitting element LED-1′ and the second portion152of the second semiconductor layer150of the second light emitting element LED-2′ are directly connected. The first portion161of the second active layer160of the first light emitting element LED-1′ and the second portion162of the second active layer160of the second light emitting element LED-2′ are directly connected. The first portion171of the third semiconductor layer170of the first light emitting element LED-1′ and the second portion172of the third semiconductor layer170of the second light emitting element LED-2′ are directly connected.

In the embodiment, the second portion192of the electrode layer190is not only electrically connected to the second portion152of the second semiconductor layer150of the second light emitting element LED-2′, but also electrically connected to the first portion151of the second semiconductor layer150of the first light emitting element LED-1′. In the embodiment, the second portion192of the electrode layer190may be used as a common anode (or cathode) of the first light emitting element LED-1′ and the second light emitting element LED-2′.

In addition, in the embodiment, the third light emitting element LED-3′ is not epitaxially completed on the same growth substrate (not shown) as the first light emitting element LED-1′ and the second light emitting element LED-2′. The third light emitting element LED-3′ is separately manufactured from the first light emitting element LED-1′ and the second light emitting element LED-2′. During the manufacturing process of the pixel structure10C, the first light emitting element LED-1′ and the second light emitting element LED-2′ may be transposed onto the driving back plate200in the same transposing action, and the third light emitting element LED-3′ is transposed onto the driving back plate200in another transposing action.

Specifically, in the embodiment, the third light emitting element LED-3′ includes a fifth semiconductor layer501, a sixth semiconductor layer503, a fourth active layer502disposed between the fifth semiconductor layer501and the sixth semiconductor layer503, and a first electrode504electrically connected to the fifth semiconductor layer501, and a second electrode505electrically connected to the sixth semiconductor layer503, wherein one of the fifth semiconductor layer501and the sixth semiconductor layer503is the first-type semiconductor layer, and the other one of the fifth semiconductor layer501and the sixth semiconductor layer503is the second-type semiconductor layer different from the first-type semiconductor layer. The fifth semiconductor layer501and the sixth semiconductor layer503of the third light emitting element LED-3′ do not belong to the same film layer as the first semiconductor layer130, the second semiconductor layer150, and the third semiconductor layer170of the first light emitting element LED-1′ and the second light emitting element LED-2′. The fourth active layer502of the third light emitting element LED-3′ does not belong to the same film layer as the first active layer140and the second active layer160of the first light emitting element LED-1′ and the second light emitting element LED-2′. The first electrode504and the second electrode505of the third light emitting element LED-3′ does not belong to the same film layer as the electrode layer190of the first light emitting element LED-1′ and the second light emitting element LED-2′.