CN-122028576-A - Micro light emitting diode, micro light emitting diode device, display and method thereof

CN122028576ACN 122028576 ACN122028576 ACN 122028576ACN-122028576-A

Abstract

The present invention relates to various aspects of a μ -LED or μ -LED device for augmented reality or light applications, especially in the automotive field. Here, the μ -LED is characterized by a particularly small size in the range of several micrometers.

Inventors

Tolsten Bohm Heinrich
Elvin Lang
Andreas Lebel
TOBIAS MAYER
Alexander Pfeiffer
MARK PHILLIPS
JENS RICHTER
THOMAS SCHWARTZ
PAUL TOWER
Tanson Waghesai
WANG XUE
Martin Bellinger
Sebastian Wittman
Julia Stoltz
Kasten Dickman
CARL ENGEL
Siegfried Herman
Betterhold Chinese
STEFAN ELEK
Bruno Yanci
Corbinian Peltzermier
Ince Piconca
Andreas Beersdorf
ANDREAS RAUSCH
Killian Rego
Tillman Lugheimer
SCHWALENBERG SIMON
Christopher Zell
PETER STAUSS
SUNDGREN PETRUS
HOA martial
WIESMANN CHRISTOPHER
Georg Bognell
Ruth Bosh
Patrick Henna
Christopher Cromp
JENS MILLER
Kerstin Neverlin
Jung Palk
Christine Raphael
Frank Thingol
Kaneshk Chander
Felik Fix
CHRISTIAN MILLER
Michael. Brandel
EVA Maria Rummel
Nicole Heitzel
Mali Asman
CHRISTIAN BERG
Ana Kanevze
PETER BRICK
Jean Jacques Drolet
Hubert Halbrit
Laura. Crainer

Assignees

奥斯兰姆奥普托半导体股份有限两合公司

Dates

Publication Date: 20260512
Application Date: 20200129
Priority Date: 20190131

Claims (14)

1. A control circuit for a display matrix comprising a plurality of light emitting devices arranged in rows and columns, comprising: -a row selection input for a row selection signal and a column data input for a data signal; -a ramp signal input for a ramp signal, the ramp signal input having a level between a first value and a second value and a trigger input for a trigger signal; -a column data buffer configured to buffer the data signal in response to the row selection signal; -a pulse generator coupled to the column data buffer and the ramp signal input and configured to provide a buffered output signal to control an on/off ratio of at least one of the plurality of light emitting devices in response to the trigger signal, the data signal and the ramp signal.
2. The control circuit of claim 1, wherein the pulse generator comprises -A comparator device for comparing said buffered data signal with said ramp signal, and -An output buffer coupled to the output of the comparator device and the trigger input.
3. The control circuit according to claim 1, wherein the output buffer comprises a flip-flop, in particular an RS flip-flop, the input of which is coupled to the output and the trigger input of the comparator device.
4. The control circuit of claim 1, wherein the column data buffer comprises a capacitor for storing the data signal and a switch disposed between the capacitor and the column data input.
5. The control circuit of claim 1, wherein the comparator device includes a power control input coupled to the trigger input to adjust its power consumption based on the trigger signal.
6. The control circuit of claim 1, wherein the comparator device is coupled to the output buffer to control its power consumption based on an output state of the output buffer.
7. The control circuit of claim 1, wherein the comparator is coupled with its inverting input to the data column buffer and with its non-inverting input to a ramp signal input.
8. The control circuit of claim 1, further comprising: -a ramp generator for providing the ramp signal to the ramp signal input, the ramp generator being configured to generate a signal that varies between an initial value and an end value in response to the trigger signal.
9. A method for controlling illumination of a light emitting device in a matrix display having a plurality of light emitting devices arranged in addressable rows and columns, the method comprising: -providing a data signal for the selected row and the at least one light emitting device; -providing a trigger signal; -converting the level of the data signal into pulses with respect to the trigger signal, and -Controlling the on/off ratio of the light emitting device by means of the pulses.
10. The method of claim 9, wherein converting the level of the data signal comprises: -generating a ramp signal between a first value and a second value; -comparing the data signal with the ramp signal to generate a comparison signal; -generating a pulse from a change in the trigger signal and the comparison signal.
11. The method of claim 9, wherein the generating of the pulse comprises setting a level of the output signal to a first value in response to the trigger signal and resetting the level of the output signal to a second value in response to a change in the comparison signal.
12. The method of claim 10, wherein the ramp signal is generated in response to the trigger signal.
13. The method according to claim 9, wherein the transmitting of the data signal comprises pre-buffering the data signal, in particular in a memory device.
14. Use of a control circuit according to claim 1 in a μ -display or for controlling a μ -LED, a μ -LED device or a μ -LED array.

Description

Micro light emitting diode, micro light emitting diode device, display and method thereof The invention is based on the division of the parent application of Chinese patent application (PCT International application PCT/EP2020/052191 entering China national stage) with the application date of 2020, 1 month and 29, the application number of 202080023800.9 and the invention of miniature light-emitting diode, miniature light-emitting diode device, display and method thereof. This patent application claims priority from the following german patent applications: DE 5 month 23 of DE 5 month 14 of DE 5 month 31 of DE 6 month 7 of DE 5 month 31 of DE 5 month 1 of DE 5 month 11 of DE 11 month 21 of DE 5 month DE 4, DE 23, DE 11, DE 5, DE 28, DE 10, DE 11, DE 5, DE 14, DE 5, DE 22, DE 6, DE 14, DE 9, DE 25, DE 10, DE 11, DE 7, DE 4, DE 9,20, denmark patent application DK PA of DE 5, month 29, DE 11, month 14 of DE 5, month 11, month 15 of DE 5, month 23, DE 5, month 7, month 12, DE 7, month 4, DE 5, month 23, DE 4, month 23, DE 10, month 29, DE 11, month 14 of DE 5, month 23, DE 9, month 11, month 15 of DE 9, the disclosure of which is incorporated herein by reference, and further claims 29 of Danish patent application DK PA of 2019, month 1, month 29, Priority of DK PA201970060 at 29 of 2019 and DK PA201970061 at 29 of 2019, the disclosures of which are incorporated herein by reference, and priority of U.S. patent application US 62/937,552 at 19 of 11 of 2019, the disclosures of which are incorporated herein by reference. Technical Field The invention relates to a micro light emitting diode, a micro light emitting diode device and a display. Background The current continuous development in the field of internet of things and communications opens the door for a variety of new applications and designs. These designs and applications provide greater effectiveness and efficiency for development, service, and manufacturing purposes. One aspect of the new design involves augmented reality or virtual reality. The general definition of "augmented reality" is "interactive experience of a real environment in which objects in the real world are augmented by computer-generated perceptible information. The information is transmitted primarily through visualization, but not limited to visual perception. Sometimes, haptic or other sensory perception may be used to augment reality. In the case of visualization, the superimposed sensory visual information may be constructive, i.e. complementary to the natural environment, or may also be non-constructive, for example by covering a portion of the natural environment. In some applications, it is also possible to interact with the superimposed sensory information in one or another. In this way, augmented reality enhances the sustained perception of the real environment by the user. Instead, the "virtual reality" replaces the user's real environment with a completely simulated environment. In other words, while a user is able to perceive the real world at least in part in an augmented reality environment, the environment in virtual reality is fully simulated and may be quite different from reality. Augmented reality may be used to improve natural environmental conditions, enriching the user's experience or supporting it to perform certain tasks. For example, a user may use a display with augmented reality functionality to help him perform certain tasks. Since information about real objects is superimposed to provide clues to the user, additional information is provided to the user, which allows them to take action faster, more safely, and more efficiently during manufacturing, repair tasks, or other services. In the medical field, augmented reality technology can be used to guide and support doctors in diagnosing and treating patients. In development, engineers may experience their test results directly so that the results may be more easily evaluated. In the travel or activity industry, augmented reality may provide users with additional information about attractions, history, etc. Augmented reality may support learning activities or tasks. Disclosure of Invention In the following description, various aspects of a μ (micro) display in automotive and augmented reality applications are described. These aspects include devices, displays, controls, process technology methods, and other aspects suitable for augmented reality and automotive applications. This includes aspects intended to generate light through indicators, displays, etc. In addition, various aspects of control circuitry, power supply, and light out-coupling, light guiding, and light focusing, as well as applications of such devices, are listed and explained in terms of different examples. The combination of aspects is not only advantageous, but is also generally necessary because of various limitations and challenges caused by the small size of the light generating components. For ease of handling, the present disclosure is