Radiation emitter, emitting device with the same, methods for fabricating the same, and associated display screen
A radiation emission and emitter technology, applied in the field of emitters, can solve problems such as increased surface area, reduced electro-optical conversion efficiency of pixels or display screens, and reduced luminous efficiency.
Pending Publication Date: 2020-10-16
ALEDIA
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Problems solved by technology
[0004] However, the exposed sides of the mesa lead to increased surface reorganization of the carrier
Therefore, the overall luminous efficiency (also referred to as "electro-optical conversion efficiency") of such a structure decreases with the lateral dimension of the mesa, because the reduced lateral dimension results in a relative increase in the surface of the lateral sides with respect to the surface of the light-emitting layer.
As a result, the electrical-to-light conversion efficiency of a mesa-based pixel or display decreases as screen resolution increases, especially when the lateral dimensions of the mesa are on the order of 10 micrometers (μm) or less
Method used
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[0056] The display 10 is partially displayed on figure 1 On and on Picture 12 Schematic representation in.
[0057] The display screen 10 is, for example, integrated in an electronic device such as a mobile phone, a tablet computer, or a laptop computer. In another embodiment, the display screen 10 may be integrated in a dedicated display device such as a television, a desktop computer screen, a smart watch, or smart glasses.
[0058] The display screen 10 is configured to display a set of images.
[0059] The display screen 10 includes a set of emitting devices 15 and a control circuit 20.
[0060] Each emitting device 15, also called a "picture element", or simply a "pixel", is configured to emit at least one first radiation.
[0061] For convenience, in the following, the emitting device 15 is referred to as a pixel 15.
[0062] For example, each pixel 15 is configured to emit one of a set of electromagnetic waves including three first radiations.
[0063] In a variant, an embodiment...
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Abstract
The present invention concerns: an emitter (25) adapted to emit a first radiation, an emitting device (15) comprising at least two such emitters, and methods for fabricating the same. The emitter (25)comprises: - a substrate (55), - a mesa (40) made of a first semiconductor material having a first bandgap value, the mesa having a superior side (70) and a lateral side (75), - a covering layer (45)comprising at least one radiation-emitting layer (85) made of a second semiconductor material having a second bandgap value strictly inferior to the first bandgap value, the at least one radiation-emitting layer (85) having a first portion (95) corresponding to the superior side (70) and a second portion (100) corresponding to the lateral side (75), a first thickness (e1) being defined for the first portion (95) and a second thickness (e2) being defined for the second portion (100), the second thickness (e2) being strictly inferior to the first thickness (e1).
Description
Technical field [0001] The invention relates to a transmitter. The invention also relates to a transmitting device comprising at least two such transmitters. The invention also relates to a display screen comprising a set of such emitting devices. The invention also relates to a method of manufacturing such a transmitter. Background technique [0002] The light emitting structure includes a stack of stacked semiconductor layers that are configured to form a set of individual light emitting mesas. This structure is usually manufactured by etching off a portion of a stack of two-dimensional layers to define the light-emitting mesa. The light emission is provided by a light emitting layer usually located at or near the top of the mesa. [0003] Because the light-emitting mesa are separated from each other, such a structure allows the emission of each mesa to be easily controlled, because each mesa can be independently powered, thereby reducing the risk of current leakage to adjace...
Claims
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IPC IPC(8): H01L27/15H01L33/06H01L33/24H01L33/00H01L33/04H01L33/18H01L33/20H01L33/32H01L33/44H01L33/50
CPCH01L27/156H01L33/007H01L33/0075H01L33/04H01L33/06H01L33/18H01L33/20H01L33/24H01L33/32H01L33/44H01L33/502H01L33/505H01L33/0093H01L33/385H01L33/0025H01L33/08H01L33/508
Inventor W·S·谭P·吕埃达·丰塞卡P·吉莱
Owner ALEDIA