TW202238560A - Light source system, display device, and brightness adjustment method - Google Patents

Abstract

The disclosure provides a light source system including a light source, a photoelectric sensor, and a controlling portion. The light source is configured to emit source light based on a driving signal. The photoelectric sensor is located on a light path of the source light to receive the source light. The photoelectric sensor is further configured to generate a sensing signal by photoelectric conversion according to the source light received. The controlling portion is electrically connected to the light source and the photoelectric sensor and is used for acquiring a first difference between the sensing signal and a first reference signal. The controlling portion is further configured to acquiring a second difference between the sensing signal and a second reference signal if the first difference is less than a first preset difference. The controlling portion is further configured to adjust the driving signal if the first difference is greater than a second preset difference, wherein the driving signal is configured to control a brightness of the source light. The disclosure further provides a display device and a brightness adjustment method.

Description

Light source system, display device and method for adjusting illuminance

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

Lighting equipment, display equipment, etc. all include a light source, and the light source can be an incandescent lamp, a tungsten halogen lamp, a fluorescent lamp, or 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 technical fields with high requirements on light sources, the deviation of light source parameters from the standard level will bring greater losses. Therefore, it is necessary to calibrate the parameters of the light source in real time. The traditional calibration method is to change the parameters (such as power) of the light source by manually adjusting the knob (such as the power regulator knob). However, the manual adjustment method will bring large reading errors; and it needs to be manually confirmed and adjusted repeatedly, and the adjustment efficiency is low.

On the one hand, 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 light path of the light source, is used to receive the light from the light source, and is used to perform photoelectric conversion according to the received light from the light source to generate a detection signal; and a control part electrically connected to 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 determine the first difference Obtaining a second difference between the detection signal and a second reference signal when the value is less than a first preset difference, and also used to adjust the second difference when it is judged that the second difference is greater than a second preset difference The value of the driving signal, the driving signal is used to control the luminous power of the light source to control the illuminance of the light from the light source.

Another aspect of the present application provides a display device, including: a light source for emitting light source light based on the driving signal; A photoelectric sensor, located on the light path of the light source, is used to receive the light from the light source, and is used to perform photoelectric conversion according to the received light from the light source to generate a detection signal; a control part electrically connected to 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 determine the first difference Obtaining a second difference between the detection signal and a second reference signal when the value is less than a first preset difference, and also used to adjust the second difference when it is judged that the second difference is greater than a second preset difference the value of the driving signal used to control the luminous power of the light source to control the illuminance of the light from the light source; and a display panel, the display panel is located on the light path of the light source, and is used for displaying images according to the light source.

Another aspect of the present application provides a method for adjusting light intensity, including: emitting light from a light source based on a driving signal; receiving the light from the light source, and performing photoelectric conversion according to the received light from the light source to generate a detection signal; Obtain a first difference between the detection signal and a first reference signal, and obtain a difference between the detection signal and a second reference signal when it is judged that the first difference is smaller than a first preset difference The second difference is to adjust the value of the driving signal when it is judged that the second difference is greater than a second preset difference, and the driving signal is used to control the illuminance of the light source.

The above-mentioned light source system, by obtaining the detection signal, can monitor whether the photoelectric sensor is working normally in real time on the one hand, so as to facilitate replacement or repair when the photoelectric sensor is abnormal; on the other hand, it can also monitor the illuminance of the light source in real time Whether it 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 adjust the size of the driving signal in time when the expected illuminance is not met, so as to adjust the illuminance of the light source to Illumination as expected. The above-mentioned light source system, display device, and illuminance adjustment method improve the errors and time-consuming problems caused by manual monitoring, and are conducive to improving monitoring efficiency and monitoring accuracy.

FIG. 1 shows a light source system 10 of this embodiment for emitting light source light. The source light may be any wavelength of visible light, and the source light may include multiple wavelengths of visible light. The light source 11 can be applied to various devices that require 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 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, and is used for receiving the light source and modulating the light source light to display images. In this embodiment, the display panel is, for example, a liquid crystal display panel, a light emitting diode display panel, and 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 .

The light source 11 emits light source light with a certain power under the driving signal. The photoelectric sensor 12 is located on the light path of the light source, and is used to receive the light from the light source and perform photoelectric conversion to generate a detection signal corresponding to the light from the light source. The control unit 13 is used for receiving the detection signal, and outputting a driving signal according to the detection signal. The control unit 13 is also used to adjust the value of the driving signal output by itself for driving the light source 11 to emit light according to the received detection signal. By adjusting the value of the driving 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 a plurality of LEDs 112 to output driving signals to each LED 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 driving signal is, the greater the light intensity of the light source emitted by the LED 112 is. That is, there is a corresponding relationship between the value of the driving signal and the illuminance of the light source. During the working process of the light source 11, the value of the driving 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 this embodiment further includes a light guide plate 14 and a light uniform plate 15 arranged parallel to the carrier substrate 111 . The light guide plate 14 is located between the carrier substrate 111 and the light uniform plate 15 . After the light from the light source is emitted from the light source 11 , its illuminance can be uniformed through the light guide plate 14 and the light uniform plate 15 .

The photoelectric sensor 12 is disposed on a surface of the uniform 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 photosensors 12 . In other embodiments, the photoelectric sensor 12 can also be a photodiode, a photomultiplier tube, a phototransistor, an infrared sensor or a fiber optic sensor. The present application does not limit the specific type of the photoelectric sensor 12 , as long as the light signal (light source light) can be converted into an electrical signal (detection signal). In this embodiment, the detection signal generated by the photoelectric sensor 12 according to the light from 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 driving chip 131 and a controller 132 electrically connected to the driving chip 131 . In this embodiment, the controller 132 may be a control chip inside the display device 100 . In other embodiments, the controller 132 can be a terminal externally installed in the equipment used by the light source system 10 . The controller 132 is electrically connected to the photoelectric sensor 12, and is used to receive the detection signal generated by the photoelectric sensor 12, and output instructions 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 LED112 Emit light source light.

This embodiment also provides an illumination adjustment method, which is applied to the above-mentioned display device 100 and light source system 10 .

Please refer to Fig. 4, the method for adjusting illuminance of an embodiment includes: Step S1, emitting light from a light source based on a driving signal; Step S2, receiving the light from the light source, and performing photoelectric conversion according to the received light from the light source to generate a detection signal; Step S3, obtaining a first difference between the detection signal and a first reference signal, and judging whether the first difference is smaller than a first preset difference; If the determination in step S3 is yes, then perform step S4: obtain a second difference between the detection signal and a second reference signal, and determine whether the second difference is greater than a second preset difference; If it is judged to be yes in step S4, then perform step S51: adjust the size of the drive signal; If the determination in step S4 is negative, execute step S52: not adjust the magnitude of the driving signal.

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.

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 works normally, there is a one-to-one correspondence between the illuminance of the light source it receives and the value of the detection signal it generates. That is to say, when the light from the light source with different illuminance is incident on the photoelectric sensor 12 , the detection signals generated have different values. If the photoelectric sensor 12 works abnormally, the corresponding relationship between the illuminance of the light source it receives and the value of the detection signal it generates will change. A small change is allowed, but a large change indicates 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 light intensity of the light source corresponding to the photoelectric sensor 12 in normal operation and the electrical signal generated by the photoelectric sensor 12 can be pre-recorded. When receiving a light source with a certain illuminance, 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 acquires the detection signal generated by the current photoelectric sensor 12, calculates the difference between the detection signal and the first reference signal, and determines whether the difference between the detection signal and the first reference signal is less than the 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 photoelectric sensor If the detector 12 is working normally, step S4 can be executed. If it is judged 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 acceptable fluctuations If the photoelectric sensor 12 is working abnormally, it is necessary to report an error so as to repair or replace 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 the actual product, due to various reasons such as process error or component performance degradation, there may be a deviation between the illuminance of the light source light actually emitted by the LED 112 and the expected illuminance when the LED 112 is driven with a certain value of the driving signal (such as bias large or 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 LED 112 and the expected illuminance, and to adjust the driving signal in time when there is a large deviation. Adjusts the illuminance of the light source light.

In this embodiment, 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 .

Because 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 There is also a one-to-one correspondence between them. In this embodiment, a comparison table of 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 electric signal can be found according to the comparison table, and the found electric 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, it means that the illuminance of the light source at this time deviates greatly from the expected illuminance, then 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 it is judged as no in step S4, it means that the difference between the illuminance of the light source light and the expected illuminance at this time is within an acceptable range, then execute step S52, without adjusting the magnitude of the drive signal, and continue the drive signal at the previous moment Drive LED112 to emit light.

The light source system 10, the display device 100 and the illuminance adjustment method of this embodiment can monitor whether the photoelectric sensor 12 is working normally in real time on the one hand by obtaining the detection signal, so as to facilitate replacement or repair of the photoelectric sensor 12 when it 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 when the expected illuminance is not met Adjust the size of the driving signal in time 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 errors and time-consuming problems caused by manual monitoring, and are conducive to improving monitoring efficiency and monitoring accuracy.

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

Please refer to FIG. 5 , in this modified embodiment, the light source 11 can be divided into a plurality of light-emitting areas 113 , each light-emitting area 113 can include a plurality of LEDs 112 , and each light-emitting area 113 receives driving signals independently to emit light from the light source. The plurality of photoelectric sensors 12 respectively receive the light source light emitted by each light-emitting area 113 and generate a detection signal corresponding to each light-emitting area 113 . According to the detection signal corresponding to each light-emitting area 113, it is judged whether the light source light emitted by each light-emitting area 113 meets expectations, and if it does not meet expectations, the corresponding driving signal of each light-emitting area 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 light intensity of the light source emitted by each light-emitting area 113 is the same, and the distribution of light source light intensity emitted by 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 are also conducive to keeping the illuminance distribution of the light source emitted by the light source 11 as a whole uniform by monitoring the illuminance of the light source in real time and adjusting the magnitude of the driving signal in real time.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Alterations and variations all fall within the scope of the claimed invention.

100: display device 10: Light source system 11: Light source 111: carrying substrate 112: LED 113: Luminous area 12: Photoelectric sensor 13: Control Department 131: Driver chip 132: Controller 14: Light guide plate 15: uniform light plate 20: Display panel S1, S2, S3, S4, S51, S52: steps

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

FIG. 2 is a 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.

S1, S2, S3, S4, S51, S52: steps

Claims (10)

A light source system, the improvement of which includes: a light source for emitting light source light based on the driving signal; A photoelectric sensor, located on the light path of the light source, is used to receive the light from the light source, and is used to perform photoelectric conversion according to the received light from the light source to generate a detection signal; and a control part electrically connected to 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 determine the first difference Obtaining a second difference between the detection signal and a second reference signal when the value is less than a first preset difference, and also used to adjust the second difference when it is judged that the second difference is greater than a second preset difference The value of the driving signal, the driving signal is used to control the luminous power of the light source to control the illuminance of the light from the light source. The light source system according to 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. The light source system according to claim 1, wherein the photoelectric sensor is a photoresistor, a photodiode, a photomultiplier tube, a phototransistor, an infrared sensor or an optical fiber sensor. The light source system according to claim 1, wherein the light source includes a plurality of light-emitting areas, each light-emitting area is used to emit light from the light source independently of each other according to the driving signal; The control part controls the illuminance 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. A display device, the improvement of which includes: a light source for emitting light source light based on the driving signal; A photoelectric sensor, located on the light path of the light source, is used to receive the light from the light source, and is used to perform photoelectric conversion according to the received light from the light source to generate a detection signal; a control part electrically connected to 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 determine the first difference Obtaining a second difference between the detection signal and a second reference signal when the value is less than a first preset difference, and also used to adjust the second difference when it is judged that the second difference is greater than a second preset difference the value of the driving signal used to control the luminous power of the light source to control the illuminance of the light from the light source; and The display panel is located on the light path of the light source and is used for displaying images according to the light source. The display device according to claim 5, wherein the photoelectric sensor is a photoresistor, a photodiode, a photomultiplier tube, a phototransistor, an infrared sensor or an optical fiber sensor. A method for adjusting illuminance, the improvement of which includes: emitting light from a light source based on a driving signal; receiving the light from the light source, and performing photoelectric conversion according to the received light from the light source to generate a detection signal; Obtain a first difference between the detection signal and a first reference signal, and obtain a difference between the detection signal and a second reference signal when it is judged that the first difference is smaller than a first preset difference The second difference is to adjust the value of the driving signal when it is judged that the second difference is greater than a second preset difference, and the driving signal is used to control the illuminance of the light source. The light intensity adjustment method according to 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. The method for adjusting illuminance according to claim 7, wherein the step of emitting light from the light source based on the driving signal is specifically: Multiple beams of light source light are emitted based on a plurality of driving signals, and each driving signal is used to control the illuminance of a single beam of light source light; The step of performing photoelectric conversion according to the received light source light to generate a detection signal is specifically: performing photoelectric conversion according to the received multiple beams of light source light to generate complex detection signals; The step of obtaining the second difference between the detection signal and a second reference signal is specifically: Obtain a second difference between each detection signal and the second reference signal. The method for adjusting illuminance according to claim 9, wherein the step of adjusting the value of the driving signal is specifically: Adjust each drive signal to the same value.

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