US-20260126714-A1 - PROJECTION DEVICE AND DRIVING METHOD OF LIGHT SOURCE MODULE SUITABLE FOR PROJECTION DEVICE

US20260126714A1US 20260126714 A1US20260126714 A1US 20260126714A1US-20260126714-A1

Abstract

A projection device including a light source module, a light source driver module, a light valve module, a lens module, and a control module is provided. The light source driver module drives the light source module to provide the illumination beam of different color lights at different time intervals. The light valve module converts the illumination beam into a projection beam. The control module provides a first control signal to the light source driver module. The light source driver module drives the light source module according to the first control signal. The control module obtains a current value based on a dimming command, and obtains a compensation time period based on the current value. The dimming command indicates that a brightness value of the projected image is adjusted to a target brightness value. The first control signal includes information of the current value and the compensation time period.

Inventors

Chin-Wen Huang
YU-SHENG LEE
Wen-Hsin Chang

Assignees

CORETRONIC CORPORATION

Dates

Publication Date: 20260507
Application Date: 20250116

Claims (16)

1 . A projection device, comprising: a light source module, configured to provide an illumination beam of different color lights at different time intervals; a light source driver module, coupled to the light source module, the light source driver module configured to drive the light source module to provide the illumination beam; a light valve module, configured to receive the illumination beam and convert the illumination beam into a projection beam; a lens module, configured to receive the projection beam and project the projection beam out of the projection device to produce a projected image; and a control module, coupled to the light source driver module, the control module configured to generate a first control signal and provide the first control signal to the light source driver module, the light source driver module configured to drive the light source module according to the first control signal, wherein the control module obtains a current value based on a dimming command, and obtains a compensation time period based on the current value, wherein the dimming command indicates that a brightness value of the projected image is adjusted to a target brightness value, wherein the first control signal comprises information of the current value and the compensation time period.
2 . The projection device according to claim 1 , wherein the light source module comprises a plurality of light emitting elements for providing the different color lights at the different time intervals, and each of the color lights is provided from at least one of the plurality of light emitting elements.
3 . The projection device according to claim 2 , wherein the light source driver module comprises a plurality of light source drivers, and each of the plurality of light source drivers controls the at least one of the plurality of light emitting elements corresponding to one of the color lights.
4 . The projection device according to claim 3 , wherein the first control signal comprises at least one enable signal, each of the at least one enable signal comprises the information of the compensation time period corresponding to one of the color lights, one of the plurality of light source drivers receives the at least one enable signal corresponding to one of the color lights and enables the at least one of the plurality of light emitting elements corresponding to the one of the color lights at an enable time point, and the at least one of the plurality of light emitting elements corresponding to the one of the color lights emits the one of the color lights after the compensation time period from the enable time point.
5 . The projection device according to claim 4 , wherein the enable time point is earlier than a disable time point at a pervious time interval.
6 . The projection device according to claim 4 , wherein a time difference between the enable time point and the disable time point at the pervious time interval increases as the current value becomes smaller.
7 . The projection device according to claim 1 , wherein the compensation time period increases as the current value becomes smaller.
8 . The projection device according to claim 1 , wherein the control module comprises a processor and a control unit, the control unit is configured to receive the dimming command and calculate the current value corresponding to the target brightness value based on the dimming command, the control unit obtains the compensation time period based on the current value and transmits a second control signal to the processor, wherein the second control signal comprises the information of the current value and the compensation time period.
9 . The projection device according to claim 8 , wherein the first control signal comprises at least one enable signal, the processor generates at least one enable signal based on the information of the compensation time period of the second control signal.
10 . The projection device according to claim 8 , wherein the processor is coupled to the light valve module, the processor is configured to generate and transmit a third control signal to the light valve module to control an operation of the light valve module.
11 . The projection device according to claim 1 , wherein the control module comprises a storage unit configured to store a look-up table of the current value and the compensation time period, and the control module obtains the compensation time period based on the current value and the look-up table.
12 . The projection device according to claim 1 , wherein the control module calculates the compensation time period corresponding to the current value based on a related curve of the current value and the compensation time period.
13 . The projection device according to claim 1 , wherein the control module adjusts an enable time period of the enable signal based on the compensation time period.
14 . The projection device according to claim 1 , further comprising: a scaler, coupled to the control module, the scaler is configured to generate the dimming command based on an input signal, wherein the input signal indicates that the brightness value of the projected image is adjusted to the target brightness value.
15 . The projection device according to claim 1 , further comprising: a light sensing device, configured to sense an environment light and generate a sensing signal; a processing unit, coupled to the light sensing device and the control module, the processing unit configured to receive the sensing signal, generate the dimming command based on the sensing signal, and transmit the dimming command to the control module.
16 . A driving method of a light source module suitable for a projection device, comprising: obtaining a current value based on a dimming command, wherein the dimming command indicates that a brightness value of a projected image is adjusted to a target brightness value; obtaining a compensation time period based on the current value; generating a first control signal with information of the current value and the compensation time period; and driving the light source module based on the first control signal at an enable time point to make the light source module provide an illumination beam of a color light after the compensation time period from the enable time point.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of U.S. Provisional application Ser. No. 63/715,640, filed on Nov. 4, 2024. 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 an optical device and a driving method suitable for the optical device, more specifically, to a projection device and a driving method of a light source module suitable for the projection device. Description of Related Art In DLP (Digital Light Processing) projection technology, the light source module provides different color lights at different time intervals, and the different color lights are converted into image lights in the DMD (Digital Micromirror Device). Therefore, the processor of the projection device controls the lighting time period of different light emitting elements in the light source module through the light source driver module in different time intervals. However, in some cases, a loss of brightness may occur, and the lighting time period does not match the DMD switching time, so the processor is unable to calculate the brightness of each grayscale correctly, leading to the problem of uneven grayscale. In addition, when controlling the projection effect of the projection device, the function of reducing the brightness is sometimes achieved by reducing the driving current. If there is no light output for a period in the preset time interval, the uneven grayscale phenomenon may occur under low driving current conditions. SUMMARY An embodiment of the disclosure provides a projection device. The projection device includes a light source module, a light source driver module, a light valve module, a lens module, and a control module. The light source module is configured to provide an illumination beam of different color lights at different time intervals. The light source driver module is coupled to the light source module. The light source driver module is configured to drive the light source module to provide the illumination beam. The light valve module is configured to receive the illumination beam and convert the illumination beam into a projection beam. The lens module is configured to receive the projection beam and project the projection beam out of the projection device to produce a projected image. The control module is coupled to the light source driver module. The control module is configured to generate a first control signal and provide the first control signal to the light source driver module. The light source driver module is configured to drive the light source module according to the first control signal. The control module obtains a current value based on a dimming command, and obtains a compensation time period based on the current value. The dimming command indicates that a brightness value of the projected image is adjusted to a target brightness value. The first control signal includes information of the current value and the compensation time period. Another embodiment of the disclosure provides a driving method of a light source module suitable for the projection device. The driving method includes: obtaining a current value based on a dimming command, wherein the dimming command indicates that a brightness value of a projected image is adjusted to a target brightness value; obtaining a compensation time period based on the current value; generating a first control signal with information of the current value and the compensation time period; and driving the light source module based on the first control signal at an enable time point to make the light source module provide an illumination beam of a color light after the compensation time period from the enable time point. Other objectives, features and advantages of the present disclosure will be further understood from the further technological features disclosed by the embodiments of the present disclosure wherein there are shown and described preferred embodiments of this disclosure, simply by way of illustration of modes best suited to carry out the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. FIG. 1 is a block diagram illustrating a projection device according to an embodiment of the disclosure. FIG. 2 is a waveform diagram illustrating enable signals and a driving current according to an embodiment of the disclosure. FIG. 3 is a waveform diagram illustrating enable signals and a driving current according to another embodiment of the disclosure. FIG. 4 is a waveform diagram illustrating enable signals and a driving current according to another embodiment of t