CN115150997A - Light source system, display device and illuminance adjusting method - Google Patents
Light source system, display device and illuminance adjusting method Download PDFInfo
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- CN115150997A CN115150997A CN202110339143.5A CN202110339143A CN115150997A CN 115150997 A CN115150997 A CN 115150997A CN 202110339143 A CN202110339143 A CN 202110339143A CN 115150997 A CN115150997 A CN 115150997A
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- light source
- light
- difference value
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/12—Controlling the intensity of the light using optical feedback
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The present application provides 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 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 judging that the first difference value is smaller than a first preset difference value, and adjusting the driving signal when judging that the second difference value is 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. The application also provides a display device and a method for adjusting the illuminance.
Description
Technical Field
The present disclosure relates to light source technologies, and particularly to a light source system, a display device using the light source system, and a method for adjusting illuminance applied to the light source system and the display device.
Background
Lighting devices, display devices, and the like include light sources, which may be incandescent, tungsten halogen, fluorescent, and the like.
Excessive use of the light source or improper maintenance may cause the light source parameters to gradually deviate from the standard levels. In the technical field with higher requirements on the light source, the deviation of the light source parameters from the standard level can bring about larger loss. Real-time calibration of the parameters of the light source is therefore required. A conventional way of calibration is by manually adjusting a knob, e.g. a power regulator knob, to change a parameter of the light source, e.g. the power. However, the manual adjustment method causes a large reading error; and the manual repeated confirmation and adjustment are needed, so that the adjustment efficiency is low.
Disclosure of Invention
One aspect of the present application provides a light source system, including:
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.
Another aspect of the present application provides a display device, including:
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 is used for displaying images according to the light source light.
Another aspect of the present application provides a method for adjusting illuminance, including:
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.
According to the light source system, the detection signal is obtained, so that whether the photoelectric sensor works normally or not can be monitored in real time, and the photoelectric sensor can be replaced or repaired conveniently when the photoelectric sensor is abnormal; on the other hand, whether the illumination of the light source light meets the expected illumination (if the second difference is smaller than the second preset difference, the illumination is considered to meet the expected illumination) can be monitored in real time, so that the magnitude of the driving signal can be timely adjusted when the illumination does not meet the expected illumination, and the illumination of the light source light can be adjusted to meet the expected illumination. The light source system, the display device and the illuminance adjusting method improve the problems of errors and time consumption caused by manual monitoring, and are beneficial to improving the monitoring efficiency and the monitoring precision.
Drawings
Fig. 1 is a block diagram of a display device according to an embodiment of the present disclosure.
Fig. 2 is a block diagram of the light source system of fig. 1.
Fig. 3 is a schematic diagram of the structure of the light source system in fig. 1.
Fig. 4 is a flowchart illustrating 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 an alternative embodiment.
Description of the main elements
Light homogenizing plate 15
Steps S1, S2, S3, S4, S51, S52
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
Fig. 1 shows a light source system 10 of the present embodiment for emitting light source light. The light source light may be any wavelength of visible light, and the light source light may include various wavelengths of visible light. The light source 11 can be applied to various apparatuses requiring a light source, for example, a display device (e.g., an outdoor electronic screen, a mobile phone, etc.), and a lighting device (e.g., an incandescent lamp, a halogen tungsten lamp, a fluorescent lamp, etc., as a lighting device of a light emitting element).
In the embodiment, the light source light includes a single wavelength of visible light, 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 an optical path of the light source light, and receives the light source light and modulates 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 photo sensor 12, and a control portion 13 electrically connected to the light source 11 and the photo sensor 12.
The light source 11 emits light source light at a certain power driven by a driving signal. The photo sensor 12 is located on the light 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 driving signal according to the detection signal. The control unit 13 is further configured to adjust the magnitude of the driving signal outputted by itself for driving the light source 11 to emit light according to the received detection signal. By adjusting the magnitude of 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 (LED), an incandescent lamp, or the like. Referring to fig. 3, in the present 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 may be configured with a circuit structure electrically connected to the plurality of LEDs 112 to output a driving signal to each of the LEDs 112. Each LED112 may emit light independently in response to a received drive signal. In this embodiment, the driving signal is a current signal. The illuminance of the source light emitted by the LED112 varies with the value of the driving signal. The greater the value of the drive signal, the greater the source light illumination emitted by the LED112. That is, there is a corresponding relationship between the value of the driving signal and the illuminance of the light source light. In the operation of the light source 11, the magnitude of the driving signal output to each LED112 can be determined according to the illuminance of the source light to be emitted by the LED112.
The light source system 10 of the present embodiment further includes a light guide plate 14 and a light equalizing plate 15 disposed in parallel with the carrier substrate 111. The light guide plate 14 is located between the carrier substrate 111 and the light-equalizing plate 15. After the light source light is emitted from the light source 11, the illuminance of the light source light can be made uniform by the light guide plate 14 and the light equalizing plate 15.
The photo-sensor 12 is disposed on a surface of the light uniformizing plate 15 facing the light guide plate 14. In the present embodiment, the photo sensor 12 is a photo resistor. The light source system 10 may include a plurality of photosensors 12. In other embodiments, the photo sensor 12 may 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 photo sensor 12, and the photo signal (light source light) may be converted into an electrical signal (detection signal). In this embodiment, the photo sensor 12 generates a detection signal as a current signal according to the light from the light source. In other embodiments, the detection signal may be other types of electrical signals, 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 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 photo sensor 12, and is configured to receive a detection signal generated by the photo sensor 12, and output 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 LED112 to emit light source light.
The present embodiment further provides a method for adjusting illumination, which is applied to the display device 100 and the light source system 10.
Referring to fig. 4, an embodiment of a method for adjusting illuminance includes:
step S1, emitting light source light based on a driving signal;
s2, receiving the light source light, and performing photoelectric conversion according to the received light source light to generate a detection signal;
s3, acquiring a first difference value between the detection signal and a first reference signal, and judging whether the first difference value is smaller than a first preset difference value or not;
if yes in step S3, step S4 is executed: acquiring a second difference value between the detection signal and a second reference signal, and judging whether the second difference value is greater than a second preset difference value;
if yes in step S4, step S51 is executed: adjusting the magnitude of the driving signal;
if the determination in step S4 is no, step S52 is executed: the magnitude of the drive signal is not adjusted.
In step S1, the driving chip 131 outputs a driving signal having an initial value to each LED112 according to the required illuminance of the light source light.
In step S2, the photo sensor 12 receives light source light from the light source 11 and generates a detection signal (current signal) through photoelectric conversion. When the photo sensor 12 works normally, the illumination of the light from the light source received by the photo sensor corresponds to the value of the detection signal generated by the photo sensor. That is, light source light with different illumination is incident on the photo sensor 12, and detection signals generated by the photo sensor have different values. If the photo sensor 12 works abnormally, the corresponding relationship between the illumination of the light source light received by the photo sensor and the value of the detection signal generated by the photo sensor changes. Smaller changes may be tolerated, but larger changes indicate that the photosensor 12 has been damaged and needs to be repaired or replaced in a timely manner.
In this embodiment, a comparison table between the illuminance of the light source corresponding to the normal operation of the photo sensor 12 and the electrical signal generated by the photo sensor 12 can be recorded in advance. When light source light with certain illumination is received, only one electric signal can be found according to the comparison table, and the found electric signal is defined as a first reference signal. A first difference value is preset.
In step S3, the controller 132 obtains the detection signal currently generated by the photo sensor 12, calculates a 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 smaller than the first difference. If the difference between the detection signal and the first reference signal is smaller than the first difference, the difference between the detection signal and the first reference signal found in the comparison table is considered to be within the acceptable fluctuation range, and the photo sensor 12 is normally operated, step S4 may be executed. If the difference between the detection signal and the first reference signal is greater than or equal to the first difference in step S3, it is determined that the difference between the detection signal and the first reference signal found in the comparison table has exceeded the acceptable fluctuation range, and the photoelectric sensor 12 is abnormal in operation, and at this time, an error needs to be reported, so as to facilitate even repairing or replacing the photoelectric sensor 12.
As mentioned above, when the LED112 is driven by a certain value of the driving signal, the light source light emitted by the LED112 has a corresponding illumination. However, in an actual product, due to various reasons such as process errors or device performance degradation, when the LED112 is driven by a certain value of the driving signal, there is a deviation (e.g., a large or small deviation) between the actual illuminance of the light source emitted by the LED112 and the expected illuminance. The light source system 10, the display device 100 and the illuminance adjusting method of the present embodiment are used to monitor whether there is a deviation between the actual illuminance of the light source light emitted by the LED112 and the expected illuminance in real time, and adjust the driving signal in time to adjust the illuminance of the light source light when a large deviation occurs.
In this embodiment, the judgment of whether there is a deviation between the illuminance of the source light actually emitted from the LED112 and the expected illuminance is determined by detecting the value of the detection signal generated by the photo 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 photo sensor 12, there is also a one-to-one correspondence between the driving signal and the electrical signal generated by the photo sensor 12. In this embodiment, a look-up table of the driving signal and the electric signal generated by the photoelectric sensor 12 is recorded in advance. When a certain driving signal is used to drive the LED112, only one electrical signal can be found according to the comparison table, and the found electrical signal is defined as a second reference signal. And presetting a second preset difference value.
In step S4, the controller 132 calculates a second difference between the currently received detection signal and a second reference signal, and determines whether the second difference is greater than the second preset difference. If the judgment in step S4 is yes, indicating that the illuminance of the light source light at this time deviates from the expected illuminance greatly, 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; and when the detection signal is smaller than the second reference signal, the driving signal is amplified. If the determination in step S4 is no, which indicates that the difference between the illumination of the light source light and the expected illumination is within the acceptable range at this time, step S52 is executed, and the driving signal at the previous time is continued to drive the LED112 to emit light without adjusting the magnitude of the driving signal.
In the light source system 10, the display device 100 and the illuminance adjusting method of the present embodiment, by obtaining the detection signal, on one hand, whether the photo sensor 12 works normally can be monitored in real time, so as to facilitate replacement or repair when the photo sensor 12 is abnormal; on the other hand, whether the illumination of the light source light meets the expected illumination (if the second difference is smaller than the second preset difference, the illumination is considered to meet the expected illumination) can be monitored in real time, so that the magnitude of the driving signal can be timely adjusted when the illumination does not meet the expected illumination, and the illumination of the light source light can be adjusted to meet the expected illumination. The light source system 10, the display device 100 and the illuminance adjusting method improve the problems of errors and time consumption caused by manual monitoring, and are beneficial to improving the monitoring efficiency and the monitoring precision.
In an alternative embodiment, it is not only required that the illuminance of the light source light emitted from the light source 11 is in accordance with the expectation, but also that the illuminance distribution of the light source light emitted from each region of the light source 11 is uniform.
Referring to fig. 5, in the modified embodiment, the light source 11 may be divided into a plurality of light emitting areas 113, each light emitting area 113 may include a plurality of LEDs 112, and the light emitting areas 113 receive driving signals to emit light source light independently. The plurality of photosensors 12 respectively receive the light source light emitted from each light emitting region 113 and generate a detection signal corresponding to each light emitting region 113. And judging whether the light source light emitted by each light emitting zone 113 is in accordance with expectation according to the detection signal corresponding to each light emitting zone 113, and adjusting the driving signal corresponding to each light emitting zone 113 when the light source light emitted by each light emitting zone 113 is not in accordance with the expectation. In this modified embodiment, the driving signals corresponding to the light emitting areas 113 are adjusted to the same value, so that the luminance of the light source emitted from the light emitting areas 113 is the same, and the luminance distribution of the light source emitted from the light source 11 is uniform.
Therefore, the light source system 10, the display device 100 and the illuminance adjusting method in this modified embodiment are also advantageous to keep the illuminance distribution of the light source light emitted from the light source 11 uniform by monitoring the illuminance of the light source light in real time and adjusting the magnitude of the driving signal in real time.
It will be appreciated by those skilled in the art that the above embodiments are illustrative only and not intended to be limiting, and that suitable modifications and variations may be made to the above embodiments without departing from the true spirit and scope of the 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110339143.5A CN115150997A (en) | 2021-03-30 | 2021-03-30 | Light source system, display device and illuminance adjusting method |
| TW110112574A TWI763418B (en) | 2021-03-30 | 2021-04-07 | Light source system, display device, and brightness adjustment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110339143.5A CN115150997A (en) | 2021-03-30 | 2021-03-30 | Light source system, display device and illuminance adjusting method |
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| CN115150997A true CN115150997A (en) | 2022-10-04 |
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| CN202110339143.5A Pending CN115150997A (en) | 2021-03-30 | 2021-03-30 | Light source system, display device and illuminance adjusting method |
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| KR100592385B1 (en) * | 2003-11-17 | 2006-06-22 | 엘지.필립스 엘시디 주식회사 | Driving Method and Driving Device of Liquid Crystal Display |
| US9297694B2 (en) * | 2012-08-16 | 2016-03-29 | Nec Corporation | Correction device and correction method for light reception power monitor |
| TWI487887B (en) * | 2014-03-19 | 2015-06-11 | Ind Tech Res Inst | Apparatus and method for inspecting light source |
| CN107818764A (en) * | 2017-10-26 | 2018-03-20 | 惠科股份有限公司 | Display system and current driving method |
| TWI720342B (en) * | 2018-09-11 | 2021-03-01 | 友達光電股份有限公司 | Image refreshing method and optical sensing device using the same |
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| TW202238560A (en) | 2022-10-01 |
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