公开(公告)号：US20250008624A1

公开(公告)日：2025-01-02

申请号：US18666831

申请日：2024-05-17

Applicant: Qisda Corporation

Inventor： Chih-Hsiang Wu

IPC: H05B45/50 ,  H05B45/10

Abstract: The disclosure provides a driving device and a driving method for a light-emitting element. The driving device includes a driving circuit, a softstart circuit, and a capacitor. An output terminal of the softstart circuit is coupled to the capacitor and the driving circuit to provide a dimming voltage. A driving signal output by the driving circuit drives a light-emitting element circuit. The driving circuit is enabled or disabled based on an enabling signal. Based on a relationship between the dimming voltage and current information of the light-emitting element circuit, the driving circuit dynamically adjusts a duty cycle of the driving signal. In response to the enabling signal disabling the driving circuit, the softstart circuit pulls down an original adjustment voltage to generate a pulled-down voltage as the dimming voltage. In response to the enabling signal enabling the driving circuit, the softstart circuit pulls up the dimming voltage.

公开(公告)号：US20200249553A1

公开(公告)日：2020-08-06

申请号：US16737921

申请日：2020-01-09

Applicant: QISDA CORPORATION

Inventor： Chi-Jen Chen ,  Chih-Hsiang Wu ,  Kuo-Chun Lee ,  Szu-Fan Chen

IPC: G03B21/14 ,  G03B21/20

Abstract: A projection apparatus includes a solid-state light source module, a high-voltage power source, an image-forming-light generating module, an insulation ring and a projection lens module. The solid-state light source module has a solid-state light source and a first metal casing. The solid-state light source is disposed in the first metal casing. The high-voltage power source is electrically connected to the solid-state light source for providing electrical power to drive the solid-state light source to emit light. The image-forming-light generating module has a second metal casing. The insulation ring is connected to the first metal casing and the second metal casing for insulating the first metal casing from the second metal casing. The projection lens module is connected to the image-forming-light generating module for projecting an image generated by light emitted from the solid-state light source after the light enters the image-forming-light generating module through the insulation ring.

公开(公告)号：US11602027B2

公开(公告)日：2023-03-07

申请号：US17536157

申请日：2021-11-29

Applicant: Qisda Corporation

Inventor： Chih-Hsiang Wu

IPC: H05B45/30 ,  H05B45/305 ,  H05B45/325

Abstract: A light source driving method is applied to a light source driving module electrically connected to a light source and a controller. The light source driving module includes a frequency setting module, a driving circuit, and a conversion module. The frequency setting module generates a frequency setting signal according to a switching signal. The driving circuit generates a light source driving signal after receiving the switching signal and a current control signal. The conversion module selectively generates a driving current flowing through the light source in response to the light source driving signal. The driving current increases continuously during a rising duration, and the light source driving signal has a first operating frequency during the rising period. The driving current remains unchanged during a stable duration, and the light source driving signal has a second operating frequency during the stable period.

公开(公告)号：US11291100B2

公开(公告)日：2022-03-29

申请号：US17218286

申请日：2021-03-31

Applicant: Qisda Corporation

Inventor： Chih-Hsiang Wu

IPC: H05B45/30 ,  H05B47/20 ,  H02H3/24

Abstract: A lamp driver circuit for driving a lamp is provided. The lamp driver circuit includes: an under voltage protection circuit; a control circuit coupled to the under voltage protection circuit; and a driver transistor coupled to the control circuit for driving the lamp under the control of the control circuit. The under voltage protection circuit detects an operation voltage. When the operation voltage is lower than a threshold, the under voltage protection circuit outputs an enable signal. The control circuit receives the enable signal to shut down the control circuit and shut down the driver transistor.

公开(公告)号：US11672060B1

公开(公告)日：2023-06-06

申请号：US17709541

申请日：2022-03-31

Applicant: Qisda Corporation

Inventor： Chi-Jen Chen ,  Chih-Hsiang Wu

IPC: H05B45/345 ,  H05B45/325 ,  H05B45/20

CPC classification number: H05B45/325 ,  H05B45/20 ,  H05B45/345

Abstract: A light emit diode (LED) driving circuit, an LED driving method and a display device thereof are provided. The LED driving circuit includes: a first LED driving unit for driving first and second color LEDs of the LED circuit. The first LED driving unit includes: a duty cycle circuit generating an enable signal based on at least two color light duty cycle signals, the at least two color light duty cycle signals controlling an emitting cycle of the LED circuit; a current control circuit, generating at least two color light current adjustment signals based the at least two color light duty cycle signals and at least two color light current level signals; and a constant current circuit, for adjusting current levels of the first and the second color LEDs of the LED circuit based on the enable signal and the at least two color light current adjustment signals.

公开(公告)号：US11215913B2

公开(公告)日：2022-01-04

申请号：US16726325

申请日：2019-12-24

Applicant: Qisda Corporation

Inventor： Chih-Hsiang Wu ,  Chi-Jen Chen

IPC: G03B21/20 ,  H04N9/31 ,  G03B21/00 ,  H01S5/042

Abstract: A projector drive circuit includes a first voltage converter, a light source driver, a second voltage converter, and an isolation circuit. The first voltage converter converts a first voltage into a second voltage. The light source driver converts the second voltage into a third voltage. The second voltage converter converts the second voltage into a fourth voltage. The control circuit, coupled to the second voltage converter, receives the fourth voltage and outputs a first control signal. The isolation circuit, coupled to the control circuit and the light source driver, receives the first control signal and generates a second control signal to the light source driver, which controls the light source driver to generate the third voltage and provide the third voltage to a light source according to the second control signal. The isolation circuit electrically isolates the control circuit from the light source driver.