CN115150997A - Light source system, display device and illuminance adjusting method - Google Patents

Abstract

The present application provides a light source system, comprising: a light source for emitting light source light based on a driving signal; a photoelectric sensor located on an optical path of the light source light, for receiving the light source light, and for receiving the light source light according to the received light source photoelectric conversion of light to generate a detection signal; and a control part, electrically connecting the light source and the photoelectric sensor, the control part is used to obtain a first difference between the detection signal and a first reference signal , and is used to obtain the second difference between the detection signal and a second reference signal when judging that the first difference is less than a first preset difference, and is also used to judge the second difference When the difference is greater than a second preset difference, the driving signal is adjusted, and the driving signal is used to control the luminous power of the light source to control the illuminance of the light of the light source. The present application also provides a display device and a method for adjusting illuminance.

Description

Light source system, display device and illumination adjustment method

technical field

The present application relates to the technical field of light sources, and in particular, to a light source system, a display device using the light source system, and an illuminance adjustment method applied to the light source system and the display device.

Background technique

Lighting equipment, display equipment, etc. all include light sources, and the light sources may be incandescent lamps, tungsten halogen lamps, fluorescent lamps, and the like.

Excessive use of the light source or improper maintenance will cause the light source parameters to gradually deviate from the standard level. In the technical field with higher requirements on light source, the deviation of light source parameters from the standard level will bring great loss. Therefore, it is necessary to calibrate the parameters of the light source in real time. The traditional calibration method is to change the parameters of the light source (such as power) by manually adjusting the knob (such as the power regulator knob). However, the manual adjustment method will bring a large reading error; and it needs to be repeatedly confirmed and adjusted manually, and the adjustment efficiency is low.

SUMMARY OF THE INVENTION

One aspect of the present application provides a light source system, including:

a light source for emitting light source light based on the driving signal;

a photoelectric sensor, located on the optical path of the light source light, for receiving the light source light, and for performing photoelectric conversion according to the received light source light to generate a detection signal; and

a control part, electrically connecting the light source and the photoelectric sensor, the control part is used for acquiring a first difference between the detection signal and a first reference signal, and used for judging the first difference When the value is less than a first preset difference, the second difference between the detection signal and a second reference signal is obtained, and it is also used to adjust when it is judged that the second difference is greater than a second preset difference The value of the drive signal, which is used to control the luminous power of the light source to control the illuminance of the light source.

Another aspect of the present application provides a display device, comprising:

a light source for emitting light source light based on the driving signal;

a photoelectric sensor, located on the optical path of the light source light, for receiving the light source light, and for performing photoelectric conversion according to the received light source light to generate a detection signal;

a control part, electrically connecting the light source and the photoelectric sensor, the control part is used for acquiring a first difference between the detection signal and a first reference signal, and used for judging the first difference When the value is less than a first preset difference, the second difference between the detection signal and a second reference signal is obtained, and it is also used to adjust when it is judged that the second difference is greater than a second preset difference the value of the drive signal used to control the luminous power of the light source to control the illuminance of the light source light; and

The display panel is located on the light path of the light source light, and is used for displaying an image according to the light source light.

Another aspect of the present application provides a method for adjusting illuminance, comprising:

Emit light source light based on the driving signal;

receiving the light source light, and performing photoelectric conversion according to the received light source light to generate a detection signal;

Obtain a first difference between the detection signal and a first reference signal, and obtain the difference between the detection signal and a second reference signal when it is determined that the first difference is less than a first preset difference For the second difference, when it is determined that the second difference is greater than a second preset difference, the value of the driving signal is adjusted, and the driving signal is used to control the illuminance of the light source light.

The above-mentioned light source system, by acquiring the detection signal, can monitor whether the photoelectric sensor works normally in real time, so as to facilitate replacement or repair when the photoelectric sensor is abnormal; Meet the expected illuminance (if the above-mentioned second difference is less than the second preset difference, it is considered to meet the expected illuminance), so as to adjust the size of the driving signal in time to adjust the illuminance of the light source to meet the expected illuminance when it does not meet the expected illuminance expected illuminance. The above-mentioned light source system, display device and illuminance adjustment method improve the problems of errors and time-consuming caused by manual monitoring, and are beneficial to improve monitoring efficiency and monitoring accuracy.

Description of drawings

FIG. 1 is a schematic block diagram of a display device according to an embodiment of the present application.

FIG. 2 is a schematic block diagram of the light source system in FIG. 1 .

FIG. 3 is a schematic structural diagram of the light source system in FIG. 1 .

FIG. 4 is a schematic flowchart of a method for adjusting illuminance according to an embodiment of the present application.

FIG. 5 is a schematic structural diagram of a light source in a modified embodiment.

Description of main component symbols

Display device 100

Lighting system 10

Light source 11

carrier substrate 111

LEDs 112

Luminous area 113

Photoelectric Sensor 12

Control 13

driver chip 131

Controller 132

light guide plate 14

Homogenizer 15

display panel 20

Steps S1, S2, S3, S4, S51, S52

The following specific embodiments will further illustrate the present application in conjunction with the above drawings.

Detailed ways

FIG. 1 shows a light source system 10 of this embodiment for emitting light source light. The light source light may be visible light of any wavelength, and the light source light may include visible light of various wavelengths. The light source 11 can be applied to various equipments requiring light sources, such as display devices (such as outdoor electronic screens, mobile phones, etc.), lighting devices (such as incandescent lamps, tungsten halogen lamps, fluorescent lamps, etc. as lighting devices as light-emitting elements).

In this embodiment, the light source light includes visible light of a single wavelength, and the light source system 10 is applied to the display device 100 for illustration. The display device 100 includes a light source system 10 and a display panel 20 . The display panel 20 is located on the light path of the light source light, and is used for receiving the light source light and modulating the light source light to display an image. In this embodiment, the display panel is, for example, a liquid crystal display panel, a light emitting diode display panel, or the like.

Referring to FIG. 2 , the light source system 10 includes a light source 11 , a photoelectric sensor 12 , and a control unit 13 electrically connected to the light source 11 and the photoelectric sensor 12 , respectively.

The light source 11 emits light source light with a certain power under the driving of the driving signal. The photoelectric sensor 12 is located on the optical path of the light source light, and is used for receiving the light source light and performing photoelectric conversion to generate a detection signal corresponding to the light source light. The control unit 13 is configured to receive the detection signal and output a drive signal according to the detection signal. The control unit 13 is further configured to adjust the value of the drive signal output by the control unit 13 for driving the light source 11 to emit light according to the received detection signal. By adjusting the value of the drive signal, the illuminance of the light source light emitted by the light source 11 can be adjusted.

The light source 11 includes at least one light-emitting element, such as a light-emitting diode (Light Emit Diode, LED), an incandescent lamp, and the like. Referring to FIG. 3 , in this embodiment, the light source 11 includes a carrier substrate 111 and a plurality of LEDs 112 disposed on the same surface of the carrier substrate 111 . The carrier substrate 111 can be provided with a circuit structure to be electrically connected to the plurality of LEDs 112 to output driving signals to each of the LEDs 112 . Each LED 112 can emit light independently according to the received driving signal. In this embodiment, the driving signal is a current signal. The illuminance of the light source light emitted by the LED 112 varies with the value of the drive signal. The greater the value of the drive signal, the greater the illuminance of the light source emitted by the LED 112 . That is, there is a corresponding relationship between the value of the driving signal and the illuminance of the light source light. During the operation of the light source 11 , the value of the drive signal output to each LED 112 can be determined according to the illuminance of the light source light that the LED 112 needs to emit.

The light source system 10 of the present embodiment further includes a light guide plate 14 and a light homogenizing plate 15 arranged in parallel with the carrier substrate 111 . The light guide plate 14 is located between the carrier substrate 111 and the light homogenizing plate 15 . After the light source light is emitted from the light source 11 , the illuminance of the light source can be uniformized by the light guide plate 14 and the light homogenizing plate 15 .

The photoelectric sensor 12 is disposed on the surface of the light homogenizing plate 15 facing the light guide plate 14 . In this embodiment, the photoelectric sensor 12 is a photoresistor. The light source system 10 may include a plurality of photo sensors 12 . In other embodiments, the photoelectric sensor 12 can also be a photodiode, a photomultiplier tube, a phototransistor, an infrared sensor or an optical fiber sensor. The application does not limit the specific type of the photoelectric sensor 12, and it is sufficient to convert an optical signal (light of a light source) into an electrical signal (detection signal). In this embodiment, the detection signal generated by the photoelectric sensor 12 according to the light of the light source is a current signal. In other embodiments, the detection signal can also be an electrical signal in other forms, such as a voltage signal or a resistance signal.

The control unit 13 includes a driver chip 131 and a controller 132 electrically connected to the driver chip 131 . In this embodiment, the controller 132 may be a control chip inside the display device 100 . In other embodiments, the controller 132 may be a terminal external to the device to which the light source system 10 is applied. The controller 132 is electrically connected to the photoelectric sensor 12 for receiving the detection signal generated by the photoelectric sensor 12 and outputting an instruction to the driving chip 131 according to the detection signal, so as to control the driving chip 131 to output the driving signal to drive each LED 112 Emit light from the light source.

This embodiment also provides a method for adjusting the illuminance, and the method for adjusting the illuminance is applied to the above-mentioned display device 100 and the light source system 10 .

Referring to FIG. 4 , a method for adjusting illuminance according to an embodiment includes:

Step S1, emitting light source light based on the driving signal;

Step S2, receiving the light source light, and performing photoelectric conversion according to the received light source light to generate a detection signal;

Step S3, acquiring a first difference between the detection signal and a first reference signal, and determining whether the first difference is less than a first preset difference;

If the determination in step S3 is yes, then step S4 is performed: obtaining a second difference between the detection signal and a second reference signal, and determining whether the second difference is greater than a second preset difference;

If it is judged as yes in step S4, step S51 is executed: adjusting the magnitude of the driving signal;

If it is determined as NO in step S4, step S52 is executed: the magnitude of the driving signal is not adjusted.

In step S1, the driving chip 131 outputs a driving signal with an initial value to each LED 112 according to the required illuminance of the light source light.

In step S2, the photoelectric sensor 12 receives the light source light from the light source 11, and generates a detection signal (current signal) through photoelectric conversion. When the photoelectric sensor 12 is working normally, there is a one-to-one correspondence between the illuminance of the light source light it receives and the value of the detection signal it generates. That is, the light sources with different illuminances are incident on the photoelectric sensor 12, and the generated detection signals have different values. If the photoelectric sensor 12 works abnormally, the corresponding relationship between the illuminance of the light source light it receives and the value of the detection signal it generates will change. Smaller changes are allowed, but larger changes indicate that the photoelectric sensor 12 has been damaged and needs to be repaired or replaced in time.

In this embodiment, a comparison table between the illuminance of the light source corresponding to the photoelectric sensor 12 during normal operation and the electrical signal generated by the photoelectric sensor 12 can be pre-recorded. When the light source of a certain illuminance is received, a unique electrical signal can be found according to the comparison table, and the found electrical signal is defined as the first reference signal. A first difference is preset.

In step S3, the controller 132 obtains the detection signal currently generated by the photoelectric sensor 12, calculates the difference between the detection signal and the first reference signal, and judges whether the difference between the detection signal and the first reference signal is less than this value. first difference. If it is judged that the difference between the detection signal and the first reference signal is smaller than the first difference, it is considered that the difference between the detection signal and the first reference signal found in the comparison table is within an acceptable fluctuation range, and the photoinductance If the detector 12 is working normally, step S4 can be executed. If it is determined in step S3 that the difference between the detection signal and the first reference signal is greater than or equal to the first difference, it is considered that the difference between the detection signal and the first reference signal found in the comparison table has exceeded an acceptable fluctuation In the range, the photoelectric sensor 12 is in abnormal operation, and an error needs to be reported at this time, so as to facilitate repair or replacement of the photoelectric sensor 12.

As mentioned above, when the LED 112 is driven with a driving signal of a certain value, the light source light emitted by the LED 112 has a corresponding illuminance. However, in an actual product, due to various reasons such as process error or component performance degradation, when the LED 112 is driven with a certain value of the driving signal, there may be a deviation between the illuminance of the light source light actually emitted by the LED 112 and the expected illuminance (such as too large or too small). The light source system 10 , the display device 100 and the illuminance adjustment method of this embodiment are used to monitor in real time whether there is a deviation between the illuminance of the light source light actually emitted by the LEDs 112 and the expected illuminance, and to adjust the driving signal in time to adjust the driving signal when a large deviation occurs. Adjusts the illuminance of the light source light.

In this embodiment, determining whether there is a deviation between the illuminance of the light source light actually emitted by the LED 112 and the expected illuminance is determined by detecting the value of the detection signal generated by the photoelectric sensor 12 .

Since there is a one-to-one correspondence between the driving signal and the illuminance of the light source, and there is a one-to-one correspondence between the illuminance of the light source and the electrical signal generated by the photoelectric sensor 12, the driving signal and the electrical signal generated by the photoelectric sensor 12 have a one-to-one correspondence. There is also a one-to-one correspondence between them. In this embodiment, a comparison table between the driving signal and the electrical signal generated by the photoelectric sensor 12 is pre-recorded. When the LED 112 is driven by a certain driving signal, only one electrical signal can be found according to the comparison table, and the found electrical signal is defined as the second reference signal. A second preset difference is preset.

In step S4, the controller 132 calculates a second difference between the currently received detection signal and the second reference signal, and determines whether the second difference is greater than the second preset difference. If the determination in step S4 is yes, indicating that the illuminance of the light source light deviates greatly from the expected illuminance at this time, step S51 is executed to adjust the magnitude of the driving signal. Specifically, when the detection signal is greater than the second reference signal, the driving signal is reduced; when the detection signal is smaller than the second reference signal, the driving signal is increased. If the judgment in step S4 is no, it means that the difference between the illuminance of the light source light and the expected illuminance is within an acceptable range, then step S52 is executed, and the drive signal at the previous moment is continued without adjusting the size of the drive signal. The LED 112 is driven to emit light.

The light source system 10, the display device 100 and the illumination adjustment method of the present embodiment can, on the one hand, monitor whether the photoelectric sensor 12 works normally in real time by acquiring the detection signal, so as to facilitate replacement or repair when the photoelectric sensor 12 is abnormal; On the other hand, it is also possible to monitor in real time whether the illuminance of the light source meets the expected illuminance (if the above-mentioned second difference is less than the second preset difference, it is considered to meet the expected illuminance), so as to facilitate timely when the expected illuminance is not met Adjust the size of the driving signal to adjust the illuminance of the light source to meet the expected illuminance. The above-mentioned light source system 10 , display device 100 and illuminance adjustment method improve the problems of errors and time-consuming caused by manual monitoring, and are beneficial to improve monitoring efficiency and monitoring accuracy.

In a modified embodiment, not only the illuminance of the light source light emitted from the light source 11 is required to meet expectations, but also the illuminance distribution of the light source light emitted from each region of the light source 11 is required to be uniform.

Referring to FIG. 5 , in this modified embodiment, the light source 11 can be divided into a plurality of light-emitting regions 113 , each light-emitting region 113 can include a plurality of LEDs 112 , and each light-emitting region 113 independently receives a driving signal to emit light from the light source . The plurality of photoelectric sensors 12 respectively receive the light source light emitted from each light-emitting region 113 and generate detection signals corresponding to each light-emitting region 113 . According to the detection signal corresponding to each light-emitting region 113 , it is determined whether the light source light emitted by each light-emitting region 113 is as expected, and if not, the driving signal corresponding to each light-emitting region 113 is adjusted. In this modified embodiment, the driving signals corresponding to each light emitting area 113 are adjusted to the same value, so that the illuminance of the light source emitted by each light emitting area 113 is the same, and the illuminance distribution of the light source 11 as a whole is uniform.

Therefore, the light source system 10 , the display device 100 and the illuminance adjustment method in this modified embodiment can monitor the illuminance of the light source in real time and adjust the size of the driving signal in real time, which is also conducive to maintaining the uniform distribution of the illuminance of the light source emitted by the light source 11 as a whole.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, not to limit the present invention, as long as the above embodiments are suitable for the scope of the spirit of the present invention Variations and variations fall within the scope of the claimed invention.

Claims (10)

1. A light source system, comprising:

a light source for emitting light source light based on a drive signal;

the photoelectric sensor is positioned on the light path of the light source light, is used for receiving the light source light and is used for carrying out photoelectric conversion according to the received light source light so as to generate a detection signal; and

the control part is used for acquiring a first difference value between the detection signal and a first reference signal, acquiring a second difference value between the detection signal and a second reference signal when the first difference value is judged to be smaller than a first preset difference value, and adjusting the value of the driving signal when the second difference value is judged to be larger than a second preset difference value, wherein the driving signal is used for controlling the luminous power of the light source so as to control the illumination of the light source.

2. The light source system of claim 1, wherein the detection signal, the first reference signal and the second reference signal are current signals, and the difference is a current difference.

3. The light source system of claim 1, wherein the photo sensor is a photo resistor, a photodiode, a photomultiplier, a phototransistor, an infrared sensor, or a fiber optic sensor.

4. A light source system as claimed in claim 1 wherein the light source comprises a plurality of light emitting zones, each for emitting the source light independently of each other in dependence on the drive signal;

the control part controls the illumination of the light source light emitted by each light emitting area to be the same by adjusting the driving current of each light emitting area.

5. A display device, comprising:

a light source for emitting light source light based on a drive signal;

the photoelectric sensor is positioned on the light path of the light source light, is used for receiving the light source light and is used for carrying out photoelectric conversion according to the received light source light so as to generate a detection signal;

the control part is electrically connected with the light source and the photoelectric sensor, and is used for acquiring a first difference value between the detection signal and a first reference signal, acquiring a second difference value between the detection signal and a second reference signal when the first difference value is judged to be smaller than a first preset difference value, and adjusting the value of the driving signal when the second difference value is judged to be larger than a second preset difference value, wherein the driving signal is used for controlling the luminous power of the light source so as to control the illumination of the light source; and

and the display panel is positioned on the light path of the light source light and used for displaying images according to the light source light.

6. The display device of claim 5, wherein the photo sensor is a photo resistor, a photodiode, a photomultiplier tube, a phototransistor, an infrared sensor, or a fiber optic sensor.

7. A method of adjusting illuminance, comprising:

emitting light source light based on the driving signal;

receiving the light source light, and performing photoelectric conversion according to the received light source light to generate a detection signal;

acquiring a first difference value between the detection signal and a first reference signal, acquiring a second difference value between the detection signal and a second reference signal when the first difference value is judged to be smaller than a first preset difference value, and adjusting the value of the driving signal when the second difference value is judged to be larger than a second preset difference value, wherein the driving signal is used for controlling the illumination of the light source.

8. The method of claim 7, wherein the detection signal, the first reference signal and the second reference signal are current signals, and the difference is a current difference.

9. An illuminance adjustment method according to claim 7, wherein the step of emitting the light source light based on the driving signal specifically comprises:

emitting a plurality of light source lights based on a plurality of driving signals, each driving signal being used for controlling the illumination of only one light source light;

the step of performing photoelectric conversion according to the received light source light to generate a detection signal specifically includes:

performing photoelectric conversion according to the received plurality of light source lights to generate a plurality of detection signals;

the step of obtaining a second difference between the detection signal and a second reference signal specifically includes:

a second difference between each detection signal and the second reference signal is obtained.

10. An illuminance adjustment method according to claim 9, wherein the step of adjusting the value of the driving signal specifically comprises:

the respective drive signals are adjusted to the same value.

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