CN111427196B - Backlight module, driving method thereof and display device - Google Patents
Backlight module, driving method thereof and display device Download PDFInfo
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- CN111427196B CN111427196B CN202010365413.5A CN202010365413A CN111427196B CN 111427196 B CN111427196 B CN 111427196B CN 202010365413 A CN202010365413 A CN 202010365413A CN 111427196 B CN111427196 B CN 111427196B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a backlight module, a driving method thereof and a display device, wherein the backlight module comprises: the white light emitting diodes are arranged on the substrate, and the compensation devices are arranged corresponding to the white light emitting diodes one by one; wherein, the compensating device includes: a cyan light emitting diode and a red photodiode connected in series with each other; the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light. The residual red light of the white light emitting diode is compensated into white light through the compensation device, so that the synthesized backlight is represented as common white, and the red block phenomenon cannot occur.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a driving method thereof and a display device.
Background
Along with the improvement of the life quality of people, the demand of people on the display industry is higher and higher, and the most obvious solution of high color gamut is reflected.
At present, the solution of high color gamut is to use a blue Light Emitting Diode (LED) chip to generate white light in combination with green phosphor and red phosphor (e.g. KSF), which can meet the requirement of color gamut BT 202085%. However, since blue light and green light have a fluorescence effect, a residual time is in the order of ns to μ s, red light has a phosphorescence effect, and a residual time is in the order of ms (about 17ms), there is a phenomenon that red light remains when a pulse current is used for driving.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a backlight module, a driving method thereof and a display device, which are used to compensate a red light residue phenomenon of red phosphor powder, so that the integrated backlight is generally white and has no red block phenomenon.
Therefore, an embodiment of the present invention provides a backlight module, including: the white LED comprises a plurality of white LEDs and compensation devices which are arranged in one-to-one correspondence with the white LEDs; wherein the content of the first and second substances,
the compensation device includes: a cyan light emitting diode and a red photodiode connected in series with each other;
and the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light-emitting diode under the irradiation of residual red light emitted when the corresponding white light-emitting diode is cut off so as to compensate the residual red light into white light.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, at least two white light emitting diodes are connected in series to form a light string, and all the white light emitting diodes form multiple independent light strings.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, the backlight module further includes: the light-emitting control circuits are arranged in one-to-one correspondence to the light strings;
the positive electrode of each lamp string is connected with a power line, and the negative electrode of each lamp string is connected with a grounding wire through the corresponding light-emitting control circuit;
the light-emitting control circuit is configured to control the light string and the grounding wire to be connected under the control of a first pulse signal, and control the light string and the grounding wire to be disconnected under the control of a second pulse signal.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, the backlight module further includes: the complementary color control circuits are arranged in one-to-one correspondence with the compensation devices;
the positive electrode of the cyan light emitting diode in each compensation device is connected with the positive electrode of the corresponding white light emitting diode, the negative electrode of the cyan light emitting diode is connected with the positive electrode of the red photosensitive diode, and the negative electrode of the red photosensitive diode is connected with the grounding wire through the corresponding complementary color control circuit;
the complementary color control circuit is configured to control the red photodiode to be disconnected from the ground line under the control of the first pulse signal, and to control the photodiode to be connected to the ground line under the control of the second pulse signal.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, the light-emitting control circuit includes: the first triode and the first resistor;
the base electrode of the first triode is connected with the power line, the first pole of the first triode is connected with the negative electrode of the lamp string, and the second pole of the first triode is connected with the grounding wire through the first resistor.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, the complementary color control circuit includes: the second triode, the inverter and the second resistor; wherein, the first and the second end of the pipe are connected with each other,
the input end of the phase inverter is connected with the power line;
the type of the second triode is the same as that of the first triode, the base electrode of the second triode is connected with the output end of the phase inverter, the first pole of the second triode is connected with the negative electrode of the red photosensitive diode, and the second pole of the second triode is connected with the grounding wire through the second resistor.
In a possible implementation manner, in the backlight module provided in the embodiment of the present disclosure, the complementary color control circuit includes: a second triode and a second resistor; wherein the content of the first and second substances,
the type of the second triode is opposite to that of the first triode, the base electrode of the second triode is connected with the power line, the first pole of the second triode is connected with the negative electrode of the red photosensitive diode, and the second pole of the second triode is connected with the grounding wire through the second resistor.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of the backlight module, including:
the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light.
In a possible implementation manner, in the foregoing driving method provided in this embodiment of the disclosure, the turning on of the red photodiode in each compensation device under the irradiation of the residual red light emitted when the corresponding white led is turned off, where the residual red light for light emission compensation of the cyan led is white light specifically includes:
loading a second pulse signal to enable the light-emitting control circuit to control the corresponding light string to be disconnected with the grounding wire, wherein the white light-emitting diode contained in the light string in the cut-off state emits residual red light; the second pulse signal also enables the complementary color control circuit to control the conduction of the cyan light emitting diode between the red photosensitive diode in the corresponding complementary color device and the grounding wire to emit light so as to compensate the residual red light into white light.
In a possible implementation manner, in the driving method provided in the embodiment of the present disclosure, the method further includes: and loading a first pulse signal to enable the light-emitting control circuit to control the corresponding light string to be conducted with the grounding wire and then emit white light, and enable the complementary color control circuit to control the corresponding complementary color device to be disconnected with the grounding wire.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including: a liquid crystal display panel and the backlight module.
The invention has the following beneficial effects:
in the backlight module, the driving method thereof and the display device provided by the embodiment of the invention, the backlight module comprises: the white light emitting diodes are arranged on the substrate, and the compensation devices are arranged corresponding to the white light emitting diodes one by one; wherein, the compensating device includes: a cyan light emitting diode and a red photodiode connected in series with each other; the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light. The residual red light of the white light emitting diode is compensated into white light through the compensation device, so that the synthesized backlight is represented as common white, and the red block phenomenon cannot occur.
Drawings
Fig. 1 and fig. 2 are schematic structural diagrams of a backlight module according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "inner", "outer", "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
An embodiment of the present invention provides a backlight module, as shown in fig. 1, including: a plurality of white light emitting diodes WLEDs, and compensation devices 101 provided in one-to-one correspondence with the respective white light emitting diodes WLEDs; wherein the content of the first and second substances,
a compensation device 101 comprising: a cyan light emitting diode CLED and a red photodiode RPD connected in series with each other;
the red photodiode RPD in each compensation device 101 turns on the cyan led CLED to emit light under the irradiation of the residual red light emitted when the corresponding white led WLED is turned off to compensate the residual red light as white light.
In the backlight module provided by the embodiment of the invention, the compensation device 101 is used for compensating the residual red light of the white light emitting diode WLED into white light, so that the integrated backlight is represented as common white, and the red block phenomenon cannot occur.
It should be noted that the white light emitting diode WLED in the embodiment of the present invention is specifically a diode that generates white light by matching a blue light emitting diode with a green phosphor and a red phosphor (e.g., KSF). When the white light emitting diode WLED is driven by a pulse current, the white light emitting diode WLED performs an on-off operation in a cycle. In the on state, the green phosphor emits green light under the irradiation of the blue light emitting diode, and the red phosphor emits red light under the irradiation of the blue light, so that part of the blue light is converted into the green light, part of the blue light is converted into the red light, and the red light and the residual blue light are mixed to form white light. In the off state, since the remaining time of the blue light and the green light is in the order of ns to μ s, the remaining time of the red light is in the order of ms (about 17ms), and the frequency of the pulse current is high, only the remaining red light can be recognized and the backlight is not recognized to be blackened.
Moreover, high brightness of the display products is also a requirement, and in order to achieve high brightness, the direct type backlight is generally combined with Local dimming (Local dimming) for medium and large size display products. The local backlight adjusting technology divides the backlight into a plurality of small areas, and controls the backlight brightness in the small areas when the backlight works. Therefore, in the case of white light emitting diodes WLED having residual red light, a local erythema phenomenon may occur.
Optionally, in the backlight module provided in the embodiment of the disclosure, as shown in fig. 1, at least two white light emitting diodes WLEDs are connected in series to form a light string 102, and all white light emitting diodes WLEDs form multiple independent light strings 102.
The light string 102 is arranged in a manner that the backlight can be controlled in a partitioned manner, so that the purpose of regulating and controlling the backlight brightness in a partitioned manner is achieved. Specifically, the brightness of the corresponding white light emitting diode WLED can be locally adjusted according to the brightness of the display image on the display panel, so that the white light emitting diode WLED corresponding to the high brightness part in the display image is adjusted to the maximum brightness, and meanwhile, the white light emitting diode WLED corresponding to the dark part in the display image is correspondingly reduced or even completely black, so that the optimal contrast is achieved, and the better display effect is realized.
Optionally, in the backlight module provided in the embodiment of the present disclosure, as shown in fig. 1, the backlight module further includes: a light emission control circuit 103 provided in one-to-one correspondence with each string of lights 102;
the positive pole of each string of lights 102 is connected with a power line VDD, and the negative pole is connected with a grounding line VSS through a corresponding light-emitting control circuit 103;
the light-emitting control circuit 103 is configured to control the light string 102 to be connected to the ground line VSS under the control of the first pulse signal, and to control the light string 102 to be disconnected from the ground line VSS under the control of the second pulse signal.
In the backlight module provided by the embodiment of the invention, each white light emitting diode WLED is provided with a compensation device 101 comprising a red photosensitive diode RPD and a cyan light emitting diode CLED. And when the white light emitting diode WLED emits light, the cyan light emitting diode CLED does not emit light; while the white light emitting diode WLED does not emit light, the cyan light emitting diode CLED emits light. Therefore, in order to ensure that the white light emitting diode WLED and the cyan light emitting diode CLED operate in opposite states, the white light emitting diode WLED and the cyan light emitting diode CLED need to be driven by applying driving signals to different power lines, or the same power line is used for providing the driving signals and is combined with other control components for driving.
Specifically, the same power line VDD is used to provide the driving signal in the present invention, and the light emitting control circuit 103 of the white light emitting diode WLED and the complementary color control circuit 104 of the complementary color device 101 are combined to achieve the technical effect that the white light emitting diode WLED and the cyan light emitting diode CLED have opposite operating states. In addition, in order to simplify the circuit layout and achieve a better complementary color effect, the complementary color device 101 of a white led WLED may be disposed in parallel in the vicinity of the white led WLED.
As can be seen from the above, in the backlight module provided in the embodiment of the present disclosure, as shown in fig. 1, it is further required to include: complementary color control circuits 104 provided in one-to-one correspondence with the respective compensation devices 101;
the positive pole of the cyan light emitting diode CLED in each compensation device 101 is connected with the positive pole of the corresponding white light emitting diode WLED, the negative pole of the cyan light emitting diode CLED is connected with the positive pole of the red photosensitive diode RPD, and the negative pole of the red photosensitive diode RPD is connected with the grounding wire VSS through the corresponding complementary color control circuit 104;
the complementary color control circuit 104 is configured to control the red photodiode RPD to be disconnected from the ground line VSS under the control of the first pulse signal, and to control the photodiode to be connected to the ground line VSS under the control of the second pulse signal.
Since the white led WLED is turned on to emit light under the driving of the first pulse signal, the cyan led CLED connected in parallel with the white led WLED is turned off by the presence of the complementary color control circuit 104 and the red photodiode RPD; the white light emitting diode WLED is turned off by the presence of the light emission control circuit 103 and the cyan light emitting diode CLED connected in parallel to the white light emitting diode WLED is turned on to emit light when driven by the second pulse signal. Therefore, it can be understood that, in the absence of the light-emitting control circuit 103, the complementary color control circuit 104 and the red photodiode RPD, the white light-emitting diode WLED and the cyan light-emitting diode CLED are driven to emit light by the first pulse signal and the second pulse signal, and based on this, the pulse current provided by the power line VDD in the embodiment of the present invention is a pulse direct current with a constant current direction and a regular high-low amplitude change, and is a pulse alternating current with a non-current direction and a regular high-low amplitude change.
It should be noted that, the on or off states of the white light emitting diodes WLED included in the light string 102 are the same, so in specific implementation, the same light-emitting control circuit 104 may also be used to control the complementary color device 101 corresponding to each white light emitting diode WLED in the light string 102, which is not limited herein.
Optionally, in the backlight module provided in the embodiment of the present disclosure, as shown in fig. 1, the light-emitting control circuit 103 includes: a first transistor T1 and a first resistor R1;
the base of the first triode T1 is connected to the power line VDD, the first pole is connected to the negative pole of the string light 102, and the second pole is connected to the ground line VSS through the first resistor R1.
Under the action of the first pulse signal, the first triode T1 is in an on state, so that the light string 102 is conducted with the ground wire VSS, and at this time, the light string 102 emits white light; under the action of the second pulse signal, the first transistor T1 is turned off, so that the string of lights 102 is disconnected from the ground line VSS, and the string of lights 102 emits the residual red light.
Optionally, in the backlight module provided in the embodiment of the present disclosure, as shown in fig. 1, the complementary color control circuit 104 includes: a second triode T2, an inverter ISLN and a second resistor R2; wherein the content of the first and second substances,
the input end of the inverter ISLN is connected with a power line;
the type of the second transistor T2 is the same as the type of the first transistor T1, the base of the second transistor T2 is connected to the output of the inverter ISLN, the first pole is connected to the negative pole of the red photodiode RPD, and the second pole is connected to the ground line through a second resistor R2.
Due to the existence of the inverter ISLN, the second triode T2 is in a closed state under the action of the first pulse signal, so that the color complementing device 101 is disconnected from the ground line VSS, and the cyan light emitting diode CLED contained in the color complementing device 101 does not emit light at the moment, so that the white light effect of the white light emitting diode WLED is not interfered; under the action of the second pulse signal, the second triode T2 is in an open state, so that the color compensating device 101 and the ground line VSS are connected, and at this time, the cyan light emitting diode CLED included in the color compensating device 101 emits light to be mixed with the residual red light emitted by the light string 102 to form white light, thereby solving the red spot phenomenon caused by residual red light, improving the light efficiency, and correspondingly improving the display effect.
Optionally, in the backlight module provided in the embodiment of the present disclosure, as shown in fig. 2, the complementary color control circuit 104 further includes: a second transistor T2 and a second resistor R2; wherein the content of the first and second substances,
the second transistor T2 is of the opposite type to the first transistor T1, the base of the second transistor T2 is connected to the power supply line VDD, the first pole is connected to the negative pole of the red photodiode RPD, and the second pole is connected to the ground line VSS via a second resistor R2.
Since the type of the second transistor T2 is opposite to the type of the first transistor T1, the same driving signal will cause the second transistor T2 to switch in an opposite state to the first transistor T1. Therefore, the second triode T2 is in a closed state under the action of the first pulse signal, so that the complementary color device 101 is disconnected from the ground line VSS, and the cyan light emitting diode CLED included in the complementary color device 101 does not emit light, so that the white light effect of the white light emitting diode WLED is not interfered; under the action of the second pulse signal, the second triode T2 is turned on, so that the complementary color device 101 and the ground line VSS are connected, and at this time, the cyan light emitting diode CLED included in the complementary color device 101 emits light to be mixed with the residual red light emitted by the string of lights 102 to form white light.
It should be noted that, the above is only an example to illustrate the specific structures of the light-emitting control circuit 103 and the complementary color control circuit 104 in the backlight module provided in the embodiment of the present invention, and in the specific implementation, the specific structures of the light-emitting control circuit 103 and the complementary color control circuit 104 are not limited to the structures provided in the embodiment of the present disclosure, and may be other structures known to those skilled in the art, and are not limited herein.
In addition, the first transistor T1 and the second transistor T2 referred to in the present invention are NPN transistors or PNP transistors. Generally, a first pole of the NPN type triode is a collector, and a second pole is an emitter; the first electrode of the PNP type triode is an emitting electrode, and the second electrode of the PNP type triode is a collecting electrode.
In addition, since the diode has a small resistance and is easily short-circuited to emit light, the first resistor R1 and the second resistor R2 are generally provided to solve the short-circuit problem.
Based on the same inventive concept, embodiments of the present invention provide a driving method for a backlight module, and since a principle of the driving method for solving the problem is similar to a principle of the driving method for solving the problem, the implementation of the driving method provided by embodiments of the present invention can refer to the implementation of the backlight module provided by embodiments of the present invention, and repeated details are not repeated.
Specifically, an embodiment of the present invention provides a method for driving a backlight module, including:
the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light.
Optionally, in the above driving method provided in the embodiment of the present disclosure, the red photodiode in each compensation device is turned on under the irradiation of the residual red light emitted when the corresponding white led is turned off, and the residual red light emitted by the cyan led is compensated to be white light, which may be specifically implemented by:
loading a second pulse signal to enable the light-emitting control circuit to control the corresponding light string to be disconnected with the grounding wire, and enabling a white light-emitting diode contained in the light string in a cut-off state to emit residual red light; the second pulse signal also enables the complementary color control circuit to control the conduction of the cyan light emitting diode between the red photosensitive diode in the corresponding complementary color device and the ground wire to emit light so as to compensate the residual red light into white light.
Optionally, in the foregoing driving method provided in an embodiment of the present disclosure, the method may further include: and loading the first pulse signal to enable the light-emitting control circuit to control the corresponding light string to be conducted with the grounding wire and then emit white light, and enable the complementary color control circuit to control the corresponding complementary color device to be disconnected with the grounding wire.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises a liquid crystal display panel and the backlight module. Preferably, the backlight module is a direct type backlight module using Local dimming technology. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. Other essential components of the display device should be understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention. In addition, because the principle of the display device for solving the problems is similar to that of the backlight module, the display device can be implemented according to the embodiment of the backlight module, and repeated details are not repeated.
The backlight module, the driving method thereof and the display device provided by the embodiment of the invention comprise the following steps: the white light emitting diodes are arranged on the substrate, and the compensation devices are arranged corresponding to the white light emitting diodes one by one; wherein, the compensating device includes: a cyan light emitting diode and a red photodiode connected in series with each other; the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light. The residual red light of the white light-emitting diode is compensated into white light through the compensation device, so that the synthesized backlight is represented as common white, and a red block phenomenon cannot occur.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A backlight module, comprising: the white LED comprises a plurality of white LEDs and compensation devices which are arranged in one-to-one correspondence with the white LEDs; wherein the content of the first and second substances,
the compensation device includes: a cyan light emitting diode and a red photodiode connected in series with each other;
and the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light-emitting diode under the irradiation of residual red light emitted when the corresponding white light-emitting diode is cut off so as to compensate the residual red light into white light.
2. The backlight module as claimed in claim 1, wherein at least two of the white leds are connected in series to form a light string, and all the white leds form a plurality of independent light strings.
3. The backlight module of claim 2, further comprising: the light-emitting control circuits are arranged in one-to-one correspondence to the light strings;
the positive pole of each lamp string is connected with a power line, and the negative pole of each lamp string is connected with a grounding wire through the corresponding light-emitting control circuit;
the light-emitting control circuit is configured to control the light string to be connected with the grounding wire under the control of a first pulse signal, and control the light string to be disconnected with the grounding wire under the control of a second pulse signal.
4. The backlight module of claim 3, further comprising: the complementary color control circuits are arranged in one-to-one correspondence with the compensation devices;
the positive electrode of the cyan light emitting diode in each compensation device is connected with the positive electrode of the corresponding white light emitting diode, the negative electrode of the cyan light emitting diode is connected with the positive electrode of the red photosensitive diode, and the negative electrode of the red photosensitive diode is connected with the grounding wire through the corresponding complementary color control circuit;
the complementary color control circuit is configured to control the red photosensitive diode and the grounding wire to be disconnected under the control of the first pulse signal, and control the photosensitive diode and the grounding wire to be connected under the control of the second pulse signal.
5. The backlight module according to claim 4, wherein the light emission control circuit comprises: a first triode and a first resistor;
the base electrode of the first triode is connected with the power line, the first pole of the first triode is connected with the negative electrode of the lamp string, and the second pole of the first triode is connected with the grounding wire through the first resistor.
6. The backlight module as claimed in claim 5, wherein the complementary color control circuit comprises: the second triode, the inverter and the second resistor; wherein, the first and the second end of the pipe are connected with each other,
the input end of the phase inverter is connected with the power line;
the type of the second triode is the same as that of the first triode, the base electrode of the second triode is connected with the output end of the phase inverter, the first pole of the second triode is connected with the negative electrode of the red photosensitive diode, and the second pole of the second triode is connected with the grounding wire through the second resistor.
7. The backlight module as claimed in claim 5, wherein the complementary color control circuit comprises: a second triode and a second resistor; wherein, the first and the second end of the pipe are connected with each other,
the type of the second triode is opposite to that of the first triode, the base electrode of the second triode is connected with the power line, the first pole of the second triode is connected with the negative electrode of the red photosensitive diode, and the second pole of the second triode is connected with the grounding wire through the second resistor.
8. A method for driving a backlight module according to any one of claims 1 to 7, comprising:
the red photosensitive diode in each compensation device is used for conducting the light emission of the cyan light emitting diode under the irradiation of the residual red light emitted when the corresponding white light emitting diode is cut off so as to compensate the residual red light into white light.
9. The driving method according to claim 8, wherein the red photodiode in each compensation device is turned on under the irradiation of the residual red light emitted when the corresponding white led is turned off, and the cyan led emits the compensated residual red light as white light, and the method specifically comprises:
loading a second pulse signal to enable the light-emitting control circuit to control the corresponding light string to be disconnected with the grounding wire, wherein the white light-emitting diode contained in the light string in the cut-off state emits residual red light; the second pulse signal also enables the complementary color control circuit to control the conduction of the cyan light emitting diode between the red photosensitive diode in the corresponding complementary color device and the grounding wire to emit light so as to compensate the residual red light into white light.
10. The driving method according to claim 9, further comprising: and loading a first pulse signal to enable the light-emitting control circuit to control the corresponding light string to be conducted with the grounding wire and then emit white light, and enabling the complementary color control circuit to control the corresponding complementary color device to be disconnected with the grounding wire.
11. A display device, comprising: a liquid crystal display panel, and a backlight module as claimed in any one of claims 1 to 7.
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