CN112017586A - Five-primary-color LED display device - Google Patents
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- CN112017586A CN112017586A CN201910455930.9A CN201910455930A CN112017586A CN 112017586 A CN112017586 A CN 112017586A CN 201910455930 A CN201910455930 A CN 201910455930A CN 112017586 A CN112017586 A CN 112017586A
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- 230000003287 optical effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000001795 light effect Effects 0.000 description 1
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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Abstract
A five-primary-color LED display device comprises a light emitting unit and a control unit. The light-emitting unit comprises a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal. The five-primary-color LED display device can display more real colors, greatly restores the real world, and can meet the requirements of high-end fields on detail display, particularly the requirements on wide color gamut.
Description
Technical Field
The invention relates to the technical field of display, in particular to an LED display device, and more particularly to a five-primary-color LED display device.
Background
The photoelectric display, from the monochromatic gray-scale-free display in the early 80 s of the last century, the two-primary-color multi-gray-scale display (R + YG) in the late 80 s of the last year, and the three-primary-color (R + G + B) display in the middle 90 s of the last year, people are always dedicated to truly restoring the colorful nature, and through the long-term industrial development, recently, the performance of the three-primary-color LED display device in all aspects of brightness, wavelength, color purity, reduction of light decay, reduction of failure rate and the like is greatly improved, and the display device enters the mature stage. However, with the continuous progress of modern lighting display technology, on the premise that the display screen or video wall lamp meets the practical requirements and exerts the light source efficacy to the maximum extent, the LED lamp is more focused on the optical effects such as the capability of representing true colors as much as possible on the display effect, the richer the display colors, and the limit values of the real world and human eyes are restored.
The gamut represents the display color rendering capability, the wider the gamut indicates the richer the display colors, the closer the colors are to the limits of the real world and human eyes, the more vivid and realistic the color will give us a feeling! That is, it can express the color quantity closer to the limit of human eyes, and no matter display pictures or play videos, people can have a vivid sense of being personally on the scene, especially when watching landscape images, people can have a pleasant feeling of excitement!
The existing three primary colors (RGB) display screen has limited display capability, and can only display colors within a certain range, while the recent international high-end application field has made further requirements on the existing display effect, especially the specification of color gamut, and the existing three primary colors (RGB) display screen can not meet the detailed display requirements of some high-end fields. For example, in the high-end professional advertisement field, the international conference high definition screen and the like, some national signs or LOGO of companies have extremely high color value standards, and any visual deviation can cause strange.
In order to improve the insufficiency of the color gamut display effect in the high-end domain and enhance the color gamut reproduction capability of the LED display, we need to further expand the range of the display color gamut.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a five-primary-color LED display device which can meet the requirements of high-end fields on detail display, particularly the requirements on wide color gamut.
The technical scheme adopted by the invention for solving the technical problems is as follows: a five primary color LED display device is provided: it comprises a light emitting unit and a control unit; the light-emitting unit comprises a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal.
As a first improvement of the five primary color LED display device provided by the present invention: the dimming circuit comprises a one-out-of-multiple analog switch, an RC integrating circuit and a field effect transistor; the input end of the one-of-more analog switch is connected with the output end of the processor, the output end of the one-of-more analog switch is connected with the input end of the field-effect tube through the RC integrating circuit, and the output end of the field-effect tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work.
Optimization of a first improvement scheme of the five-primary-color LED display device provided by the invention is as follows: the model of the one-out-of-multiple analog switch is CD 4067.
Optimization of a first improvement scheme of the five-primary-color LED display device provided by the invention is as follows: the model of the field effect transistor is 2SK 1058.
Optimization of a first improvement scheme of the five-primary-color LED display device provided by the invention is as follows: the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein the input end of the digital-to-analog converter is connected with the output end of the processor, the output end of the digital-to-analog converter is connected with the input end of the comparator, the output end of the field effect transistor is connected to the input end of the comparator in a feedback mode, and the output end of the comparator is connected to the processor in a feedback mode.
Optimization of a first improvement scheme of the five-primary-color LED display device provided by the invention is as follows: the model of the digital-to-analog converter is DAC 0832.
Optimization of a first improvement scheme of the five-primary-color LED display device provided by the invention is as follows: the comparator is of the type LM 324.
As a second improvement of the five-primary-color LED display device provided by the present invention: the dimming circuit comprises a one-out-of-multiple analog switch and a power switch tube; the input end of the one-from-many analog switch is connected with the output end of the processor, the output end of the one-from-many analog switch is connected with the input end of the power switch tube, and the output end of the power switch tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work.
The optimization of the second improvement scheme of the five-primary-color LED display device provided by the invention comprises the following steps: the model of the power switch tube is IFR 830.
The optimization of the second improvement scheme of the five-primary-color LED display device provided by the invention comprises the following steps: the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein the input end of the digital-to-analog converter is connected with the output end of the processor, the output end of the digital-to-analog converter is connected with the input end of the comparator, the output end of the power switch tube is connected to the input end of the comparator in a feedback mode, and the output end of the comparator is connected to the processor in a feedback mode.
The five-primary-color LED display device provided by the invention can achieve the following beneficial effects: the five-primary-color LED display device comprises a light emitting unit and a control unit; the light-emitting unit comprises a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal. In the five-primary-color LED display device, the control unit controls the brightness of the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp, and the blue LED lamp through the processor and the dimming circuit, respectively, so as to display a more realistic color, greatly reduce the real world, and meet the requirements of high-end fields on detail display, particularly, wide color gamut.
Drawings
Fig. 1 is a block diagram of a five-primary-color LED display device according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dimming circuit in a five-primary-color LED display device according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dimming circuit in a five-primary-color LED display device according to a second embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The five-primary-color LED display device provided by this embodiment includes a light emitting unit and a control unit. As shown in fig. 1, the light emitting unit includes a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp, and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal. In the five-primary-color LED display device, the control unit controls the brightness of the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp, and the blue LED lamp through the processor and the dimming circuit, respectively, so as to display a more realistic color, greatly reduce the real world, and meet the requirements of high-end fields on detail display, particularly, wide color gamut. It should be explained that the color signals of the video image include both luminance and chrominance information. The physiological characteristics of human eyes determine that the sensitivity of human eyes to image brightness greatly exceeds the sensitivity to color information. In the three colors of red, green and blue of the conventional display screen, the main brightness information comes from the green part, and in the five primary colors LED display device of the present embodiment, the brightness information of the image occupies a larger proportion of the yellow, cyan and color parts in addition to the green part. While the green and yellow colors are the highest perceived brightness for human vision. Therefore, the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp are respectively driven through the corresponding ports of the control unit, and the picture seen by people can be brighter and more vivid. Therefore, on the premise of meeting practical requirements and exerting the efficacy of the light source to the maximum extent, the display effect of the video is emphasized, the real color expression capability is realized as much as possible, the display color is richer, and the optical and coloristic effects such as the limit value of the real world and human eyes are restored. When the number of primary colors is continued, firstly, the proportion of cost increase is not in proportion to the improvement of the effect, and secondly, the maturity of mass production of LED materials with other wavelengths is also problematic. The best way to extend the color gamut is therefore the RYGCB five primary display scheme. The five-primary-color LED display technology can better meet the high-end requirement of human on display, and is an important development of future LED display.
In this embodiment, referring to fig. 2, the dimming circuit includes a one-out-of-multiple analog switch, an RC integrating circuit, and a field effect transistor; the input end of the one-of-more analog switch is connected with the output end of the processor, the output end of the one-of-more analog switch is connected with the input end of the field-effect tube through the RC integrating circuit, and the output end of the field-effect tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work. Specifically, the model of the one-out-of-multiple analog switch is CD4067, which is a one-out-of-sixteen analog switch. The five output ends of the one-out-of-multiple analog switch are respectively connected with the input ends of the five RC integrating circuits in a one-to-one correspondence mode, the output ends of the five RC integrating circuits are respectively connected with the input ends of the five field effect tubes in a one-to-one correspondence mode, and the output ends of the five field effect tubes are respectively connected with one red LED lamp, one yellow LED lamp, one green LED lamp, one cyan LED lamp and one blue LED lamp in a one-to-one correspondence mode. The type of the field effect tube is 2SK1058, and the processor is a singlechip. Furthermore, the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein an input end of the digital-to-analog converter is connected with an output end of the processor, an output end of the digital-to-analog converter is connected with an input end of the comparator, an output end of the field effect transistor is connected to an input end of the comparator in a feedback mode, and an output end of the comparator is connected to the processor in a feedback mode. Specifically, the model of the digital-to-analog converter is DAC0832, and the model of the comparator is LM 324.
The working principle of the dimming circuit is as follows: when the single chip microcomputer receives a dimming signal from a computer, a corresponding control signal is generated, the control signal comprises serial number information and driving current value information of an LED to be adjusted, the LED branch corresponding to the serial number of the multi-selection analog switch is gated, PWM waves with a certain duty ratio are sent to the gating branch of the multi-selection analog switch, meanwhile, the single chip microcomputer controls the digital-to-analog converter to generate a voltage corresponding to the driving current, the voltage is sent to the comparator to serve as a given voltage, after the PWM waves are sent to the gating branch, the PWM waves are added to the grid of the field effect tube through the RC integrating circuit to drive the corresponding LED lamp to emit light with corresponding brightness, and therefore brightness adjustment of the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp is achieved. On the other hand, the driving current of the LED lamp is controlled by the grid voltage of the field effect transistor, the voltage on a sampling resistor connected with the LED in series is connected to the minus end of the comparator as the feedback voltage, the given voltage generated by the digital-to-analog converter is connected to the plus end of the comparator, the comparison result of the sampling voltage and the given voltage is sent to the single chip microcomputer, and the output of the PWM wave is adjusted, so that the driving current of the LED is ensured to be a value to be adjusted.
The five-primary-color LED display device provided by the embodiment can bring the following beneficial effects:
1. the five-primary-color LED display device can directly synthesize white light by using red, yellow, green, cyan and blue light without fluorescent powder. Specifically, when the light effects of blue, cyan, green, yellow and red light respectively reach 70%, 55%, 45%, 25% and 55%, the color rendering index can reach 97.8.
2. The optical effects of improving the real color expression capability on the display effect, increasing the display color, restoring the limit values of the real world and human eyes and the like can bring more vivid and lifelike feeling to audiences.
3. The five primary colors of red, yellow, green, cyan and blue are adopted, great advantages are achieved in cyan and yellow scenes, yellow and cyan details are prominent, the expression level is full, and the cyan is transparent and natural. Meanwhile, the expressive force of golden and green is enhanced, and more natural colors can be restored.
4. In color expression, the display color gamut of the five-primary-color LED display device can reach more than 200% of the NTSC standard, and the obvious color gamut is fully proved to be obviously improved.
Example two
The five-primary-color LED display device provided by this embodiment includes a light emitting unit and a control unit. The light-emitting unit comprises a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal.
Referring to fig. 3, the dimming circuit includes a one-out-of-multiple analog switch and a power switch tube; the input end of the one-from-many analog switch is connected with the output end of the processor, the output end of the one-from-many analog switch is connected with the input end of the power switch tube, and the output end of the power switch tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work. Specifically, the model of the one-out-of-multiple analog switch is CD4067, which is a one-out-of-sixteen analog switch. The five output ends of the one-out-of-multiple analog switch are respectively connected with the input ends of the five power switch tubes in a one-to-one correspondence mode, and the output ends of the five power switch tubes are respectively connected with one red LED lamp, one yellow LED lamp, one green LED lamp, one cyan LED lamp and one blue LED lamp in a one-to-one correspondence mode. The model of the power switch tube is IFR830, and the processor is a single chip microcomputer. Furthermore, the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein an input end of the digital-to-analog converter is connected with an output end of the processor, an output end of the digital-to-analog converter is connected with an input end of the comparator, an output end of the field effect transistor is connected to an input end of the comparator in a feedback mode, and an output end of the comparator is connected to the processor in a feedback mode. Specifically, the model of the digital-to-analog converter is DAC0832, and the model of the comparator is LM 324.
The main differences between the dimming circuit in the present embodiment and the dimming circuit in the first embodiment are as follows: the dimming circuit in the embodiment does not adopt an RC integrating circuit, but adopts an IFR830 power switch tube to replace a 2SK1028 field effect transistor, and the LED current is a pulse current with constant amplitude and fast frequency by rapidly controlling the on-off of the IFR830, so that the average current of the LED determines the brightness of the LED. In summary, the fast switching of the LED by a frequency that is not easily perceived by the human eye gives the illusion that the LED is always on, and the switching time ratio determines the average current through the LED and thus its brightness.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A five-primary-color LED display device comprises a light emitting unit and a control unit, and is characterized in that: the light-emitting unit comprises a red LED lamp, a yellow LED lamp, a green LED lamp, a cyan LED lamp and a blue LED lamp; the control unit comprises a processor and a dimming circuit, and the dimming circuit is respectively connected with the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp and the blue LED lamp of the processor and the light-emitting unit; the processor is used for receiving a dimming signal from a computer and generating a corresponding control signal, and the dimming circuit is used for controlling the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp according to the control signal.
2. The five primary LED display device according to claim 1, wherein: the dimming circuit comprises a one-out-of-multiple analog switch, an RC integrating circuit and a field effect transistor; the input end of the one-of-more analog switch is connected with the output end of the processor, the output end of the one-of-more analog switch is connected with the input end of the field-effect tube through the RC integrating circuit, and the output end of the field-effect tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work.
3. The five primary LED display device according to claim 2, wherein: the model of the one-out-of-multiple analog switch is CD 4067.
4. The five primary LED display device according to claim 2, wherein: the model of the field effect transistor is 2SK 1058.
5. The five primary LED display device according to claim 2, wherein: the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein the input end of the digital-to-analog converter is connected with the output end of the processor, the output end of the digital-to-analog converter is connected with the input end of the comparator, the output end of the field effect transistor is connected to the input end of the comparator in a feedback mode, and the output end of the comparator is connected to the processor in a feedback mode.
6. The five primary color LED display device according to claim 5, wherein: the model of the digital-to-analog converter is DAC 0832.
7. The five primary color LED display device according to claim 5, wherein: the comparator is of the type LM 324.
8. The five primary LED display device according to claim 1, wherein: the dimming circuit comprises a one-out-of-multiple analog switch and a power switch tube; the input end of the one-from-many analog switch is connected with the output end of the processor, the output end of the one-from-many analog switch is connected with the input end of the power switch tube, and the output end of the power switch tube outputs LED current to drive the red LED lamp, the yellow LED lamp, the green LED lamp, the cyan LED lamp or the blue LED lamp to work.
9. The five primary LED display device according to claim 8, wherein: the model of the power switch tube is IFR 830.
10. The five primary LED display device according to claim 8, wherein: the dimming circuit further comprises a digital-to-analog converter and a comparator, wherein the input end of the digital-to-analog converter is connected with the output end of the processor, the output end of the digital-to-analog converter is connected with the input end of the comparator, the output end of the power switch tube is connected to the input end of the comparator in a feedback mode, and the output end of the comparator is connected to the processor in a feedback mode.
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| CN210039592U (en) * | 2019-05-29 | 2020-02-07 | 深圳市达特照明股份有限公司 | A five-primary color LED display device |
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| CN1539128A (en) * | 2001-06-11 | 2004-10-20 | ��˹��ŵ�� | Apparatus, system and method for color display |
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| JP2006344913A (en) * | 2005-06-10 | 2006-12-21 | Hirosaki Univ | Full color light emitting diode |
| US20130021580A1 (en) * | 2011-07-23 | 2013-01-24 | Texas Instruments Incorporated | Systems and Methods of LED Color Overlap |
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