WO2021218604A1

WO2021218604A1 - Projection device

Info

Publication number: WO2021218604A1
Application number: PCT/CN2021/086421
Authority: WO
Inventors: 吴超; 杨洋; 陈保林; 余新; 胡飞
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2020-04-30
Filing date: 2021-04-12
Publication date: 2021-11-04
Also published as: CN113596414A

Abstract

Disclosed by the present application is a projection device, comprising a light source array module, an image processing unit and a driving unit. The light source array module comprises a first light-emitting element array that emits first primary color light, a second light-emitting element array that emits second primary color light, and a third light-emitting element array that emits third primary color light, wherein the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array are all divided into M×N illumination regions. The image processing unit is used to divide an image to be projected into M×N image regions, and acquire brightness information of the first primary color light, the second primary color light and the third primary color light of each image region, and the image regions are in one-to-one correspondence with the illumination regions of the light source array module. The driving unit is used to sequentially drive the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array in a time sequence according to the brightness information of the first primary color light, the second primary color light, and the third primary color light of each image region. The circuit structure is simplified, thus saving on costs and reducing power consumption.

Description

A projection device

Technical field

This application belongs to the field of projection display technology, and particularly relates to a projection device.

Background technique

The contrast of the projection display technology of the single spatial light modulator is far lower than the resolution of the human eye, and the gray scale of the projection display is small, the sense of layering is poor, and a lot of details are lost. The high dynamic range (HDR) projection system can effectively increase the contrast and brightness of the projection image, and has rich grayscale information in both bright and dark fields, which can greatly improve the quality of the projection image and the audience’s viewing experience .

At present, one solution to realize HDR projection system is LCD Local Dimming (dimming) technology with LED backlight. This technical solution uses an LED array as the light source of the projection device, and each LED is responsible for the illumination of an area. During projection display, the luminous intensity of each LED light source is dynamically controlled according to the brightness of each area of the projection screen to achieve high-contrast display. , To avoid unnecessary loss of light energy, however, the use of sub-area dimming technology as the light source of the projection device, due to the huge number of LEDs in the LED array, complex circuits, high cost, and difficult to achieve.

Summary of the invention

The main technical problem solved by this application is to provide a projection device that simplifies the driving circuit and reduces the circuit cost and power consumption.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a projection device including a light source array module, an image processing unit, and a driving unit. The light source array module includes a first light emitting element array that emits light of a first primary color, The second light emitting element array emitting the second primary color light, the third light emitting element array emitting the third primary color light, the first light emitting element array, the second light emitting element array and the third light emitting element array are all divided into M×N illumination areas The image processing unit is used to divide the image to be projected into M×N image areas, and obtain the brightness information of the first primary color light, the second primary color light, and the third primary color light of each image area, where the image area and the light source The illumination area of the array module corresponds one-to-one; the driving unit is connected with the first light-emitting element array, the second light-emitting element array, the third light-emitting element array, and the image processing unit, and is used to determine the first primary color light and the second light of each image area. The brightness information of the two primary color light and the third primary color light, sequentially drive the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array in sequence, and control the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array. The luminous brightness of each illumination area of the light-emitting element array.

The beneficial effect of the present application is that, different from the prior art, the projection device in the embodiment of the present application drives the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array sequentially through the driving unit, and controls the first light-emitting element array. The luminous brightness of each illumination area of a light-emitting element array, a second light-emitting element array, and a third light-emitting element array can drive three light-emitting element arrays in a time-division multiplexing manner, which can reduce the number of driving units and simplify the circuit structure , Save the cost of the circuit and reduce the power consumption of the circuit.

Description of the drawings

Fig. 1 is a block diagram of an embodiment of a projection device according to the present application;

2 is a block diagram of another embodiment of the projection device of the present application;

FIG. 3 is a schematic circuit diagram of an embodiment of the DC-DC driving circuit of the projection device of the present application.

Detailed ways

In order to make the purpose, technical solutions, and effects of this application clearer and clearer, the following further describes this application in detail with reference to the accompanying drawings and examples.

An embodiment of the application provides a projection device. As shown in FIG. 1, a light source array module 140, an image processing unit 130, and a driving unit 160. The light source array module 140 includes a first light emitting element array 141 that emits light of a first primary color, The second light emitting element array 142 emitting the second primary color light, the third light emitting element array 143 emitting the third primary color light, the first light emitting element array 141, the second light emitting element array 142, and the third light emitting element array 143 are all divided into M ×N illumination areas; the image processing unit 130 is used to divide the image to be projected into M×N image areas, and obtain brightness information of the first primary color light, the second primary color light, and the third primary color light of each image region, Among them, the image area corresponds to the lighting area of the light source array module 140; the driving unit 160 is connected to the first light emitting element array 141, the second light emitting element array 142, the third light emitting element array 143 and the image processing unit 130 for According to the brightness information of the first primary color light, the second primary color light, and the third primary color light of each image area, the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143 are sequentially driven in sequence, and The light-emitting brightness of each illumination area of the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143 is controlled.

The projection device of the embodiment of the present application drives the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143 sequentially through the driving unit 160, and controls the first light-emitting element array 141 and the second light-emitting element array. The luminous brightness of each illumination area of 142 and the third light-emitting element array 143 can be realized by driving three light-emitting element arrays in a time-division multiplexing manner, which can reduce the number of driving units 160, simplify the circuit structure, save circuit costs, and reduce The power consumption of the circuit is reduced.

Specifically, in the embodiment of the present application, the first primary color light is red light, the second primary color light is blue light, and the third primary color light is green light. The first light-emitting element array 141 emits red light, and the second light-emitting element array 142 emits red light. The blue light and the third light emitting element array 143 emit green light. The first light-emitting element array 141 is arranged by a plurality of first light-emitting element arrays 141, the second light-emitting element array 142 is arranged by a plurality of second light-emitting element arrays 142, and the third light-emitting element array 143 is arranged by a plurality of third light-emitting elements. The array 143 is arranged. The number of the first light-emitting element, the second light-emitting element, and the third light-emitting element is preferably greater than or equal to M×N. Wherein M is greater than or equal to 2 and N is greater than or equal to 2.

Further, in the embodiment of the present application, the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143 are spatially separated from each other. The second primary color light emitted by the two light emitting element arrays 142 and the third primary color light emitted by the third light emitting element array 143 are combined by the light combining device and then emitted to form the emitted light of the light source array module 140. When the first primary color light is red light, the second primary color light is blue light, and the third primary color light is green light, the light combining device includes a first dichroic plate and a second dichroic plate. The sheet can transmit blue light and reflect green light, and is arranged at the intersection of the blue light emitted by the second light-emitting element array 142 and the green light emitted by the third light-emitting element array 143, and is used to combine the blue light and the green light; The dichroic plate can transmit blue light and green light and reflect red light. It is set at the intersection of the combined light of the blue light and green light emitted by the first dichroic plate and the red light emitted by the first light-emitting element array 141 for Combine red light, blue light and green light.

Preferably, the driving unit 160 is a current driving unit for driving the light-emitting element with a current corresponding to the brightness information. By controlling the current size of the light-emitting elements in the light source array module 140 to control the brightness of the light-emitting elements, it is suitable to use a spatial light modulator to realize a regional dimming projection display.

As shown in FIG. 2, the projection device of the embodiment of the present application further includes a drive control unit 150, the drive control unit 150 is connected to the drive unit 160, and the image processing unit 130 is connected to the drive control unit 150; the drive control unit 150 receives the image processing unit 130 The brightness information of the first primary color light, the second primary color light, and the third primary color light of each image area in the image area is used to control the plurality of driving units 160 to drive the first light-emitting element array 141 or the second light-emitting element array 142 or the third light-emitting The element array 143; the driving unit 160 is used to drive the first light-emitting element array 141 or the second light-emitting element array 142 or the third light-emitting element array 143.

Further, the projection device of the embodiment of the present application further includes a power supply circuit 110 and a switch 120. There are three switches 120, namely a first switch 121, a second switch 122, and a third switch 123. The first switch 121 is connected to Between the power supply circuit 110 and the first light-emitting element array 141; the second switch 122 is connected between the power supply circuit 110 and the second light-emitting element array 142; the third switch 123 is connected between the power supply circuit 110 and the third light-emitting element array 143 The drive control unit 150 is connected to the first switch 121, the second switch 122 and the third switch 123, and is used to connect the first switch 121 when the drive unit 160 drives the first light-emitting element array 141, and the drive unit 160 drives the second switch. When the light-emitting element array 142 is connected to the second switch 122, when the driving unit 160 is controlled to drive the third light-emitting element array 143, the third switch 123 is connected.

In the embodiment of the present application, the driving unit 160 controls the connection of the first switch 121, the second switch 122, and the third switch 123 in a sequential manner, so as to realize the sequential driving of the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element. Component array 143.

In this embodiment, according to the aspect ratio of the screen, the light-emitting elements in the light source array module 140 are arranged according to M×N, and the image processing unit 130 is used to receive the image information to be projected, and according to the arrangement of the light-emitting element array, the The projection image information is divided into M×N regions, and the first primary color light intensity information of the first primary color frame in each region is generated according to the image information to be projected, and the third primary color light brightness information of the third primary color frame in each region is generated according to the image information to be projected. The second primary color light intensity information in each area of the second primary color picture frame, the image processing unit 130 receives the frame synchronization signal, and under the control of the frame synchronization signal, the image processing unit 130 combines the first primary color light brightness information and the third primary color light The brightness information and the light brightness information of the second primary color are sequentially sent to the drive control unit 150.

The driving control unit 150 is used to send the brightness information to the driving unit 160 in sequence, and to drive the first switch in a time-division multiplexed manner by sequentially turning on and off the three switches 120 of the first switch 121, the second switch 122, and the third switch 123. The light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143.

In this embodiment, the driving unit 160 is a light-emitting element driving chip, and each output terminal of the light-emitting element driving chip is connected to a first light-emitting element, a second light-emitting element, and a third light-emitting element, and time-sharing is performed in a frame period of a picture. The three light-emitting elements are driven in turn by multiplexing, dividing a picture frame period into three segments. Each time a light-emitting element is lit to form a single-color picture frame, and finally through the visual residual effect of the human eye, the red and blue , Green three single-color picture frames synthesize a color picture frame.

The projection device of the embodiment of the present application drives the three light-emitting

element arrays

141, 142, and 143 in a time-division multiplexing manner, which can reduce the number of light-emitting element driving chips to one-third of the original number, simplifying the circuit and reducing Circuit cost and power consumption. The projection device of the embodiment of the present application can adjust the size of the driving current of each light-emitting element, thereby adjusting the brightness of each light-emitting element, to meet the requirements of the sub-regional dimming projection display system; and the embodiment of the present application only needs one drive control unit 150. The three switches 120 and the light-emitting element drive chip make the drive control unit 150 have fewer IO ports and simpler circuit connection.

Specifically, in this embodiment, the image processing unit 130 is an FPGA (Field Programmable Logic Gate Array), and the drive control unit 150 is a CPLD (complex programmable logic device), which is used to process images and control the data transmission process. The driving unit 160 is a current control unit with the TLC5940 chip as the core. The chip is a 16-channel sinking type light-emitting element driving chip. The output current of each channel is adjusted by a 6-bit binary number. The brightness information is adjusted in specific implementation. Each brightness value is mapped to a corresponding 6-bit binary number, and then the CPLD inputs these mapped binary numbers to the TLC5940 chip to control the current of each channel, so as to dynamically adjust the brightness of each area of the image to be projected. The purpose of the brightness of the light-emitting element meets the requirements of the sub-regional dimming projection display technology for the backlight source. In the embodiment of the present invention, each channel of the TLC5940 chip is connected to the cathode of each light-emitting element in the three light-emitting element arrays, and the first switch 121, the second switch 122, and the third switch are sequentially turned on in one frame period. In the 123 way, these three light-emitting elements are driven by time-division multiplexing. Using this time division multiplexing method reduces the required TLC5940 chip by 2/3, simplifies the circuit, and reduces the circuit cost and power consumption.

Specifically, in this embodiment, each switch 120 is composed of an NMOS tube and a PMOS tube. The control ends of the NMOS tube and the PMOS tube are respectively connected to the CPLD, and the first end of the NMOS tube is connected to the power supply circuit 110. The second end is connected to the light-emitting element array; the first end of the PMOS tube is connected to the light-emitting element array, and the second end of the PMOS tube is grounded. The CPLD controls the switch 120 to be turned on or off by outputting a control signal, so that the power supply circuit 110 and the light source array are modulated. The group 140 is turned on or off, where the power supply circuit 110 is a DC-DC drive circuit. In this embodiment, when a switch 120 needs to be turned on, the NMOS tube is turned off first, and then the PMOS tube is turned on. Turning off the NMOS tube first can prevent the PMOS tube The DC-DC drive circuit is short-circuited at the moment of opening to prevent the NMOS tube from being burned out by a large current on the NMOS tube. When a switch 120 needs to be turned off, first turn off the PMOS tube and then turn on the NMOS tube; after turning off the PMOS tube, turning on the NMOS tube can quickly discharge the anode charge of the light-emitting element and increase the speed of the switch 120.

For the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143, the driving voltage may vary from 1V to 2V, and different driving circuits are required. In order to solve this problem, the embodiment of the present application The output voltage range of the DC-DC drive circuit is adjustable from 3.3V to 5V, as shown in Figure 3. The DC-DC drive circuit of the embodiment of the present application includes a DC-DC chip 111 and a numerically controlled potentiometer 112. The output voltage of the DC-DC chip 111 is controlled by the resistance value of the numerically controlled potentiometer 112, and the numerically controlled potentiometer 112 and the drive control unit 150 is connected, and the DC-DC chip 111 is connected to the switch 120. When the driving unit 150 drives the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element 143 array, the drive control unit 150 sends the digital control potentiometer 112 to the A control signal for controlling the resistance adjustment of the numerically controlled potentiometer 112 is sent, so that the DC-DC chip 111 outputs the first output voltage, the second output voltage, and the third output voltage. Specifically, in the embodiment of the present application, the FB pin (voltage adjustment pin) and the SW pin (switch 120 control pin) of the DC-DC chip 111 are connected to a numerically controlled potentiometer 112 with adjustable resistance to achieve DC -The output voltage of the DC drive circuit is adjustable; the resistance value of the numerically controlled potentiometer 112 can be controlled by writing an 8bit binary number to its SDI pin. In this embodiment, the drive control unit 150, namely the CPLD, is connected to the numerically controlled potentiometer 112 When the driving unit 160 needs to drive a light-emitting element array of a certain color, the CPLD only needs to send the corresponding control number to the numerically controlled potentiometer 112 to allow the DC-DC driving circuit to output the corresponding driving voltage, that is, through time division multiplexing. , A DC-DC drive circuit is used to realize the functions of three DC-DC drive circuits, which simplifies the circuit structure and saves the circuit cost.

Specifically, in this embodiment, the FPGA is connected to the CPLD, the first switch 121 is connected between the DC-DC driving circuit and the first light-emitting element array 141, and the second switch 122 is connected between the DC-DC driving circuit and the second light-emitting element Between the arrays 142, the third switch 123 is connected between the DC-DC driving circuit and the third light-emitting element array 143; the CPLD is connected to the control ends of the first switch 121, the second switch 122, and the third switch 123 in the switch 120 , So as to control the opening or closing of the three switches 120 respectively, so as to control the DC-DC drive circuit to connect or disconnect with the three light-emitting

element arrays

141, 142, and 143 respectively. The CPLD is connected with the numerical control potentiometer of the DC-DC drive circuit. To adjust the output voltage of the DC-DC driving circuit so that the output voltage is between 3.3V and 5V, so as to drive the first light-emitting element array 141, the second light-emitting element array 142, and the third light-emitting element array 143; the CPLD and the driving Each TLC5940 chip of the unit 160 is connected, and the output terminal of each TLC5940 chip is respectively connected with a first light-emitting element, a second light-emitting element, and a third light-emitting element. The driving unit 160 is used for controlling according to the numerical information of the brightness information. The driving current of each light-emitting element; used for the DC-DC driving circuit to control the TLC5940 chip to drive all the first light-emitting elements at the same time to control the DC-DC driving circuit to provide the first output voltage, which is used to control the TLC5940 chip to drive all the second ones at the same time The DC-DC driving circuit is controlled to provide the second output voltage when the light-emitting element is controlled, which is used to control the DC-DC driving circuit to provide the third output voltage when the TLC5940 chip is controlled to drive all the third light-emitting elements at the same time.

Specifically, in the embodiment of the present application, the light source array module 140 takes a 7x12 light source array module 140 as an example, a total of 84 light-emitting elements, and the light-emitting element driving chip of the driving unit 160 in the embodiment of the present application is a sixteen-channel light-emitting device. Component driver chip. The driver unit 160 needs six sixteen-channel light-emitting component driver chips. CPLD is connected to the six light-emitting component driver chips respectively, which can accurately control the driving current of each of the 84 light-emitting components and is constant Value; the embodiment of the present application only needs three switches 120, which can control the opening or closing of the three light-emitting

element arrays

141, 142, 143; a DC-DC driving circuit can output different driving voltages to control R, G , B Start-up of light-emitting elements of different colors. The embodiment of the application is provided with six sixteen-channel light-emitting element driving chips, three switches 120 and one CPLD, which can achieve precise adjustment of the brightness of each light-emitting element, which meets the requirements of the sub-area dimming projection technology for the light source, and the circuit structure Simple and low cost.

The projection method of the projection device of the embodiment of the present application, as shown in FIG. 4, includes the following steps:

Step 210: Obtain the image information to be projected.

Step 220: Divide the image information to be projected according to the partitions of the light-emitting element array.

For example, the light-emitting element array is an M×N light source array module 140, and the image information to be projected is divided into M×N image information areas to be projected one-to-one mapping with the light-emitting element array;

Step 230: Generate brightness information of each area of the image information to be projected in the three primary colors of the first primary color light, the second primary color light, and the third primary color light.

The first primary color light is red light, the second primary color light is green light, and the third primary color light is blue light. Specifically, according to the brightness of each area of the screen projection, the image information area to be projected is generated into a single primary color and regional brightness information, that is, the first primary color light brightness information in each region of the first primary color frame is generated, and the third primary color frame is The brightness information of the third primary color of each region, and the brightness information of the second primary color of the second primary color frame in each region.

Step 240: Receive the frame synchronization signal.

Specifically, the frame synchronization signal includes a first primary color frame synchronization signal, a second primary color frame synchronization signal, and a third primary color frame synchronization signal. The first primary color frame synchronization signal, the second primary color frame synchronization signal, and the first primary color frame synchronization signal are received in this embodiment. The frame synchronization signal of the three primary colors is received according to a certain timing.

Step 250: Send the brightness information of each area of the image information of the three primary colors to be projected to the drive control unit 150 in sequence.

Specifically, if the frame synchronization signal of the first primary color is received first, step 251 is executed: the first primary color light intensity information including the first primary color frame in each area is sent to the drive control unit 150; and then the second primary color is received When the frame synchronization signal is used, step 252 is performed: the second primary color brightness information in each area of the second primary color frame is sent to the drive control unit 150; when the third primary color frame synchronization signal is received later, step 253 is performed: The brightness information of the third primary color in each area of the third primary color picture frame is sent to the driving control unit 150.

Step 260: The driving control unit 150 controls to turn on or off the three switches 120, the power supply circuit 110 outputs the driving voltage required to light the light-emitting element, and sends the brightness information of each area of the image information of the three primary colors to be projected to the driving unit 160 in turn.

Specifically, when the drive control unit 150 receives the brightness information containing the first primary color, step 261 is executed: the drive control unit 150 sends a control signal to the first switch 121, and controls the first switch 121 to open, so that the power supply circuit 110 and the first switch 121 are turned on. The light emitting element array 141 is turned on, and the power supply circuit 110 outputs the driving voltage of the first primary color light emitting element chip to light up the first light emitting element array 141; at the same time, the driving control unit 150 sends the first primary color light brightness information to the driving unit 160.

Step 270: The driving unit 160 controls the driving current of each light-emitting element according to the numerical information of the brightness information.

Specifically, step 271 is performed: the driving unit 160 controls the driving current of each light-emitting element of the first light-emitting element array 141 according to the numerical information including the light intensity information of the first primary color, lights the first light-emitting element array 141, and controls the first light-emitting element. The brightness of each light-emitting element in the element array 141.

Step 280: the first light-emitting element array 141 outputs the first primary color picture frame, the third light-emitting element array 143 outputs the third primary color picture frame, and the second light-emitting element array 142 outputs the second primary color picture frame.

Specifically, it includes step 281: the first light-emitting element array 141 outputs the first primary color picture frame.

Similarly, when the third primary color frame synchronization signal is received, steps 262, 272, and 282 are executed, and the third light-emitting element array 143 outputs the third primary color frame.

Specifically, step 262: When the drive control unit 150 receives the third primary color light brightness information in each area of the third primary color frame, the drive control unit 150 sends a control signal to the third switch 123 to control the third switch 123 Turn on, so that the power supply circuit 110 and the third light-emitting element array 143 are connected. The power supply circuit 110 outputs the driving voltage of the green light-emitting element chip to light up the third light-emitting element array 143; at the same time, the drive control unit 150 sends information about each area containing the green image to be projected. The brightness information is sent to the driving unit 160.

Step 272: The driving unit 160 controls the driving current of each light-emitting element of the third light-emitting element array 143 according to the numerical information including the third primary color light intensity information table, and lights the third light-emitting element array 143.

Step 282: The third light-emitting element array 143 outputs the third primary color picture frame.

Similarly, when the second primary color frame synchronization signal is received, steps 263, 273, and 283 are executed, and the second light-emitting element array 142 outputs the second primary color picture frame.

Specifically, step 263: when the drive control unit 150 receives the brightness information containing the second primary color, the drive control unit 150 sends a control signal to the second switch 122 to control the second switch 122 to turn on, so that the power supply circuit 110 and the second light-emitting element The array 142 is turned on, and the power supply circuit 110 outputs the driving voltage of the blue light-emitting element chip to light up the second light-emitting element array 142; at the same time, the driving control unit 150 sends the second-primary-color light intensity information in each region containing the second-primary-color frame to Drive unit 160.

Step 273: The driving unit 160 controls the driving current of each light-emitting element of the second light-emitting element array 142 according to the numerical information included in the light intensity information table of the second primary color, and lights the second light-emitting element array 142.

Step 283: The second light-emitting element array 142 outputs the second primary color picture frame.

Step 290: Output a frame of color picture.

Specifically, using the visual residual effect of the human eye, three single-primary-color picture frames, the first primary-color picture frame, the second-primary-color picture frame, and the third-primary-color picture frame, are combined into one color picture frame.

Further, step 250: outputting the driving voltage required by the power supply circuit 110 to light the light-emitting element includes: the driving control unit 150 adjusts the output voltage of the power supply circuit 110.

When the drive control unit 150 receives the first primary color light brightness information including the first primary color frame in each area, the drive control unit 150 sends the control number to the digital control potentiometer 112 of the DC-DC drive circuit to control the DC-DC The driving circuit outputs a voltage for illuminating the first light emitting element array 141. When the drive control unit 150 receives the light brightness information containing the second primary color, the drive control unit 150 sends a control number to the digitally controlled potentiometer 112 of the DC-DC drive circuit to control the DC-DC drive circuit to output and light up the second light-emitting element array 142 voltage. When the driving control unit 150 receives the light brightness information containing the third primary color, the driving control unit 150 sends the control number to the digitally controlled potentiometer 112 of the DC-DC driving circuit to control the DC-DC driving circuit to output and light up the third light-emitting element array 143 voltage.

The above are only implementations of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technical fields, The same reasoning is included in the scope of patent protection of this application.

Claims

A projection device, characterized in that it comprises:

The light source array module includes a first light-emitting element array that emits light of the first primary color, a second light-emitting element array that emits light of the second primary color, and a third light-emitting element array that emits light of the third primary color. The first light-emitting element array, The second array of light-emitting elements and the third array of light-emitting elements are divided into M×N illumination areas;

The image processing unit is used to divide the image to be projected into M×N image areas, and obtain brightness information of the first primary color light, the second primary color light, and the third primary color light of each image area, wherein the image area One-to-one correspondence with the illumination area of the light source array module;

The driving unit is connected to the first light-emitting element array, the second light-emitting element array, the third light-emitting element array and the image processing unit, and is configured to respond to the first primary color light, the second primary color light and the second primary color light of each image area. The brightness information of the three primary colors, the first light emitting element array, the second light emitting element array, and the third light emitting element array are sequentially driven, and the first light emitting element array, the second light emitting element array, and the third light emitting element array are controlled. The luminous brightness of each illumination area of the element array.
The projection device according to claim 1, wherein the driving unit is a current driving unit for driving the first light-emitting element array, the second light-emitting element array, and the second light-emitting element array by a current corresponding to the brightness information. Three light-emitting element arrays.
The projection device according to claim 1, further comprising a drive control unit connected between the image processing unit and the drive unit for sending the brightness information to the The driving unit, and controlling the driving unit to drive the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array.
The projection device according to claim 3, wherein the projection device further comprises:

Power supply circuit

A first switch connected between the power supply circuit and the first light-emitting element array;

A second switch connected between the power supply circuit and the second light-emitting element array;

The second switch is connected between the power supply circuit and the third light-emitting element array;

The drive control unit is connected to the first switch, the second switch, and the third switch, and is used to communicate with the first switch when controlling the drive unit to drive the first light-emitting element array, and to control the drive unit The second switch is connected when the second light-emitting element array is driven, and the third switch is connected when the driving unit is controlled to drive the third light-emitting element array.
The projection device according to claim 4, wherein the first switch, the second switch, and the third switch all comprise an NMOS tube and a PMOS tube, wherein the control terminals of the NMOS tube and the PMOS tube are connected to each other. The drive control unit is connected, the first end of the NMOS tube is connected to the power supply circuit, the second end of the NMOS tube is connected to the light emitting element array; the first end of the PMOS tube is connected to the light emitting element array, The second end of the PMOS tube is grounded.
The projection device according to claim 4, wherein the drive control unit is connected to the power supply circuit for controlling the power supply circuit to provide a first The output voltage is used to control the power supply circuit to provide a second output voltage when the drive unit is controlled to drive the second light-emitting element array, and it is used to control the power supply circuit when the drive unit drives the third light-emitting element array. The power supply circuit provides a third output voltage.
The projection device according to claim 6, wherein the power supply circuit comprises a DC-DC chip and a digitally controlled potentiometer, the resistance of the digitally controlled potentiometer is adjustable, and the output voltage of the DC-DC chip is affected by For controlling the resistance of the numerically controlled potentiometer, the numerically controlled potentiometer is connected to the drive control unit, the DC-DC chip is connected to the first switch, the second switch, and the third switch, and the drive unit When driving the first light-emitting element array, the second light-emitting element array, and the third light-emitting element array, the drive control unit respectively sends control signals for controlling the resistance adjustment of the numerically controlled potentiometer to the numerically controlled potentiometer, so as to The DC-DC chip is made to output the first output voltage, the second output voltage, and the third output voltage.
The projection device according to claim 7, wherein the digital control potentiometer is connected between the voltage adjustment pin and the switch control pin of the DC-DC chip, and the serial data input lead of the digital control potentiometer The pin is connected to the drive control unit, and the drive control unit sends a control number to the numerically controlled potentiometer so that the DC-DC chip outputs a corresponding drive voltage.
The projection device according to claim 3, wherein the image processing unit is configured to receive a frame synchronization signal, and under the control of the frame synchronization signal, the first primary color light, the second primary color light, and the second primary color light The brightness information of the three primary colors is sequentially sent to the drive control unit.
The projection device according to claim 3, wherein the magnitude of the current at the output end of the drive unit is controlled by the drive control unit, and each output end of the drive unit is simultaneously connected to a first light emitting element and a second light emitting element. Light-emitting element and a third light-emitting element.