CN111899700A - 3D display device and backlight control method - Google Patents
3D display device and backlight control method Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 46
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 claims abstract description 4
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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
- G09G3/36—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 using liquid crystals
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/194—Transmission of image signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/398—Synchronisation thereof; Control thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The present invention provides a 3D display device, comprising: the video input unit is used for receiving an HDMI video signal input by external equipment; the video processing unit is used for receiving the video signal transmitted by the video input unit and processing and controlling the sharpness, the chroma and the brightness of the video signal; a backlight driving unit for providing a stable driving current and voltage; the liquid crystal display unit is used for providing plane uniform illumination normal display images through the backlight light source. And the communication unit is used for receiving an instruction of external equipment to realize the on/off, brightness adjustment and 2D/3D display mode switching of the 3D display device and feeding back the state information of the 3D display device to the external equipment. The 3D display device keeps consistent brightness in 2D and 3D display modes by controlling and adjusting LED driving voltage and current in the backlight driving unit and PWM duty ratio of the video processing unit, does not influence user experience conditions, reduces power consumption of the 3D display device and prolongs the whole service life of the 3D display device.
Description
Technical Field
The present invention relates to a 3D display technology, and in particular, to a 3D display device and a backlight control method.
Technical Field
The 3D display technology utilizes the principle of binocular parallax of people, namely, after the left eye and the right eye of a person respectively receive different pictures, the brain superposes and reproduces image information to form an image with three-dimensional direction effects of front-back, up-down, left-right, far-near and the like, so that people can be as if they are in the scene when watching films or videos. In order to achieve such a stereoscopic effect on a flat display device, the stereoscopic display device needs to be used with 3D glasses, and the time division method is widely used in the field of 3D display technology as the most common scheme used with 3D glasses.
The principle of the existing active 3D display is that the left eye and right eye pictures are alternately displayed at a refresh rate of more than or equal to 100Hz, the 3D glasses are matched with a left eyeglass and a right eyeglass of the 3D glasses to be synchronously opened and closed, so that the left eye and the right eye respectively obtain corresponding pictures of more than or equal to 50 frames, and due to the residual effect of liquid crystal, the pictures can simultaneously exist a data part which is not updated in the previous frame (left picture) and a data part which is updated in the next frame (right picture), so the display needs to adopt a special backlight control mode, and each frame of the pictures is displayed within a display period (T)c) The backlight needs to be turned off when the picture is updated (T)off) And opens after update is completed (T)on) And works synchronously with the picture switch to eliminate 3D crosstalk and improve 3D vivid effect because of the PWM duty ratio T of the backlight switch control signalon/(Ton+Toff) Less than 50% under the condition of satisfying the 3D effect, causing serious brightness loss, can improve the 3D and watch the luminance through improving backlight drive voltage to increase backlight working current, in order to avoid the user from producing the luminance jump in switching 2D and 3D display mode, influencing user experience, so the display has adopted the same drive voltage and is shaded and switch PWM signal control under 2D and 3D display mode.
According to the traditional active 3D liquid crystal display, in order to achieve an ideal 3D viewing effect, a PWM control method is used for closing backlight and shading when a picture is refreshed and opening backlight after refreshing is completed, and the PWM control method can lose more display brightness and cannot meet the brightness requirement of a user. In order to meet the brightness requirement of a user, the defect can be solved by increasing the driving voltage of the backlight LED and increasing the working current, and when the user needs to watch a 2D picture, the same backlight PWM control is also used in the 2D display mode in order to ensure that the display brightness is basically consistent with the 3D display mode. However, the method satisfies the condition that the brightness of the 2D mode is consistent with that of the 3D mode, the 3D vivid effect is improved, meanwhile, the backlight component bears the same high voltage and large current of the 3D display mode from the beginning, the consumption of the backlight component is serious, and the service life of the display is seriously shortened.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a 3D display device and a backlight control method, and aims to solve the problem that the display brightness of a display is consistent in 2D and 3D modes, and simultaneously avoid the situation that a backlight component in the 2D mode bears the same high-voltage large current in the 3D display mode, so that the effect of prolonging the whole service life of the display is achieved.
The present invention provides a 3D display device, comprising:
the video input unit is used for receiving HDMI video signals input by external equipment and comprises at least one HDMI interface;
the video processing unit is used for receiving the video signal transmitted by the video input unit and processing and controlling the sharpness, the chroma and the brightness of the transmitted video signal, and the video processing unit can be used for programming output current and voltage parameters;
a backlight driving unit for providing a stable driving current and voltage;
the liquid crystal display unit is used for providing plane uniform illumination normal display images through the backlight light source.
The communication unit is used for receiving an instruction of an external device to realize the on/off, brightness adjustment and 2D/3D display mode switching of the 3D display device, and the communication unit is used for feeding back state information of the 3D display device to the external device.
The 3D display device keeps consistent brightness in 2D and 3D display modes by controlling LED driving voltage, current and PWM duty ratio in the backlight driving unit, does not influence user experience conditions, reduces power consumption of the 3D display device and prolongs the whole service life of the 3D display device.
Preferably, the 3D display device further includes a power management unit, an indication unit, and a key unit;
the power management unit is used for converting an input power into a plurality of groups of power with different voltages, supplying power to the video input unit, the video processing unit, the backlight driving unit, the liquid crystal display unit, the communication unit, the indicating unit and the key unit and ensuring the normal work of each unit;
the indicating unit is used for indicating the 3D display mode to be switched on or switched off and comprises at least one indicating lamp; when the 3D display equipment is triggered to be turned on, the indicator light is turned on, and when the 3D display equipment is turned off, the indicator light is turned off;
the key unit is used for inputting user information.
Preferably, the key unit includes a first key and a second key, and the first key is used for implementing the opening and closing functions of the 3D display device; the second key is used for realizing the function of switching the 2D/3D display mode.
Preferably, the video processing unit may recognize a 2D video signal format and a 3D video signal format;
when a 2D video signal format is input, the video processing unit adjusts display configuration parameters and enters a 2D display mode;
when a 3D video signal format is input, the video processing unit adjusts video output configuration parameters and enters a 3D display mode.
Preferably, the video processing unit identifies 2D and 3D video signal format functions and can perform corresponding display mode switching through the second key.
Preferably, the switching of the display mode can be automatically recognized by the video processing unit and automatically trigger the display of the 2D or 3D display mode.
Preferably, the HDMI interface may be a DP interface;
the HDMI interface can be a VGA interface;
the HDMI interface can be a DVI interface;
the HDMI interface can be any combination of one or more of an HDMI interface, a DP interface, a VGA interface and a DVI interface.
Preferably, the liquid crystal display unit includes a liquid crystal panel and a backlight light source, and the backlight light source is an LED light source.
Preferably, the external device may be a computer, a tablet computer, and a mobile phone.
The 3D display device can show a 3D display mode by matching with 3D glasses, so that an immersive three-dimensional effect is achieved; however, 3D display is performed by overlapping a frame of picture left and right to present a 3D effect, so that when 3D display is performed, the PWM duty ratio cannot reach 100% or a larger ratio, and the brightness of the display is determined by the voltage, the current and the PWM duty ratio, so that there are two ways to reach a certain brightness, one is to increase the voltage and the current and reduce the PWM duty ratio, and the other is to reduce the voltage and the current and increase the PWM duty ratio, because the PWM duty ratio is less than 50% in the 3D display mode, under the condition of maintaining the 3D display effect, the voltage and the current are relatively high, and when the display mode is switched to the 2D display mode, the prior art adopts the same voltage, current and duty ratio, so that under the 2D display mode, the display device still needs to bear high voltage and current in the 3D display mode, and has great loss to the display device; according to the method, the driving voltage and current of the backlight LED are reduced in the 2D display mode, the backlight turn-on time (PWM duty ratio) is increased and adjusted to 100%, the driving voltage and current of the backlight LED are increased when the display is switched to the 3D display mode, the backlight turn-on time (PWM duty ratio) is reduced, and under the condition that the 3D display effect is guaranteed, the brightness of the display is basically consistent in the 2D display mode and the 3D display mode, the switching process is smooth and natural, the user experience is not influenced, and due to the fact that most of the time in the display application is in the 2D display mode, the backlight driving voltage in the 2D display state is reduced, the backlight working current is reduced, the power consumption of the display is reduced, and the overall service.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a 3D display device;
FIG. 2 is a schematic diagram of a functional key assembly of a 3D display device;
FIG. 3 is a schematic diagram of a liquid crystal display unit of a 3D display device;
FIG. 4 is a schematic diagram of a backlight control method for a 3D display device;
fig. 5 is a flowchart illustrating operation steps of a backlight control method for a 3D display device.
Description of reference numerals:
a video processing unit 10, a video input unit 11, a power management unit 12, a communication unit 13, an indication unit 14, a key unit 15, a first key 15a, a second key 15b, a backlight driving unit 16, a liquid crystal display unit 17, a liquid crystal panel 17a, and a backlight light source 17 b;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
The present invention provides a 3D display device, as shown in fig. 1, comprising:
the video input unit 11 is configured to receive an HDMI video signal input by an external device, where the external device may be a computer, a tablet computer, a mobile phone, and the like, and is not limited to these devices, and the video input unit includes an HDMI interface, where the HDMI interface may also be a DP interface, a VGA interface, a DVI interface, any video interface known to the public, or any combination interface of one or more of these interfaces.
A video processing unit 10, the video processing unit 10 is used for receiving the video signal transmitted by the video input unit 11, and processing and controlling the sharpness, the chroma and the brightness of the transmitted video signal; the video processing unit 10 may recognize a 2D video signal format and a 3D video signal format, recognize a video display format through a serial number of the 2D/3D video display format bound to a video film source, turn on or off an OSD menu generated by the video processing unit 10 when recognizing the 2D and 3D video signal formats, and perform corresponding display mode switching through a second key.
In another embodiment, the display mode switching may be automatically recognized by the video processing unit 10 and automatically triggered to perform the corresponding 2D or 3D display mode switching.
In other embodiments, the switching of the display mode may be triggered by the tracking of the tracking identification point of the active tracking glasses to the receiving point on the display device in space, and the tracking is identified to automatically switch the 3D display mode.
In other embodiments, the display mode switching may be performed by remote control of a remote controller to switch between 2D and 3D display modes.
When a 2D video format is input, the video processing unit 10 adjusts display configuration parameters to enter a 2D display mode; when the 3D video format is input, the video processing unit 10 adjusts the video output configuration parameters to enter the 3D display mode.
And the power management unit 12 is used for converting the input method person power into a plurality of groups of power with different voltages, and respectively supplying the power with different voltages to the video processing unit 10, the video input unit 11, the communication unit 13, the indicating unit 14, the key unit 15, the backlight driving unit 16 and the liquid crystal display unit 17, so that each unit can normally work.
And the communication unit 13 is configured to receive an instruction transmitted by the external device to implement power on, power off, brightness adjustment, switching between the 2D mode and the 3D mode, and meanwhile, the state information of the 3D display device is also fed back to the external device through the communication unit 13.
The indicating unit 14 is electrically connected with the video processing unit 10 and used for displaying the on or off state of the 3D display device, the indicating unit 14 comprises an LED indicating lamp, when the 3D display device is triggered to be turned on, the LED indicating lamp is turned on, and when the 3D display device is triggered to be turned off, the LED indicating lamp is turned off; the indicator light is not limited to an LED indicator light, but may be any indicator light having a light emitting indication function, such as a light emitting diode.
The key unit 15, as shown in fig. 2, is used for a user to input information or instructions, and the key unit 15 includes a first key 15a and a second key 15b, where the first key 15a is used to turn on or off a key of the 3D display device, and the second key 15b is used to switch between the 2D mode and the 3D mode during the playing process of the 3D display device. After the power of the 3D display device is switched on, the 3D display device is switched on through the key 15a, the LED indicator lamp is turned on, the 3D display device is displayed to be in an on state, and the 2D mode or the 3D mode is switched to be the 3D mode or the 2D mode through the second key 15 b.
The liquid crystal display unit 17, as shown in fig. 3, the liquid crystal display unit 17 includes a liquid crystal panel 17a and a backlight light source 17b, preferably, the backlight light source 17b is an LED light source, the backlight light source 17b is located behind the liquid crystal panel 17a, the liquid crystal panel 17a cannot emit light by itself, and must use other light sources to passively emit light, and the backlight light source 17b provides planar uniform illumination for the liquid crystal panel 17a, so that the liquid crystal panel 17a emits light to display images. The backlight light source in the embodiment adopts an LED lamp light source, and the backlight light source can also be any light source capable of stably emitting light.
The backlight driving unit 16 is electrically connected with the video processing unit 10 and the liquid crystal display unit 17, the backlight driving unit is used for providing stable driving voltage and current for the liquid crystal display unit 17, meanwhile, the video processing unit 10 processes video signal output voltage and current configuration parameters and transmits the video signal output voltage and current configuration parameters to the backlight driving unit 16, the backlight driving unit 16 inputs corresponding voltage and current according to the voltage and current configuration information fed back by the video processing unit 10 and supplies the corresponding voltage and current to the liquid crystal display unit 17, and therefore the liquid crystal display unit 17 can display corresponding display states according to voltage and current parameter instructions sent by the video processing unit 10.
Fig. 4 is a schematic diagram of a backlight control of a 3D display device, where a video is played in a manner of displaying a frame-by-frame graphic, and when a left eye and a right eye respectively obtain more than or equal to 50 frames of pictures per second, and the video is seen by human eyes as continuous video pictures, so that the refresh rate of the display is more than or equal to 100HZ, in this embodiment, the refresh rate is 120HZ, the left eye and the right eye respectively obtain 60 frames of pictures per second, and the images of the display per second are synthesized by 60 frames of the left eye and 60 frames of the right eye; however, since the liquid crystal response of the display requires time, the switching process of the previous frame and the next frame may have a residual image, and the residual image of the liquid crystal may cause two images to exist simultaneously in the switching process of the left and right images due to the alternating display of the left and right images in the 3D display mode, so that the backlight is required to be blackened during the switching process to avoid the residual image.
As shown in fig. 4, under the 3D display mode backlight control PWM, the software acquires a per-frame picture time Tc. In this embodiment, when the current display refresh rate is 120Hz, Tc is 1/120s is approximately 8.333ms, the display liquid crystal response speed is constant, which is obtained by referring to the liquid crystal LCD specification, and the response time is 5ms, Toff is 5ms, Ton is Tc-Toff is 8.333-5 is 3.333ms, the software sets the backlight signal PWM period to 8.333ms, the duty ratio is 3.333/8.333 approximately 40%, which is much lower than 100% of the 2D display state; therefore, the voltage and the current under the 3D display mode are relatively large, when the 3D display device calls up the resource file and plays the resource file at the display service end, the time of the 2D display mode is longer than that of the 3D display mode, when the traditional backlight control PWM is adopted, namely under the 2D display mode, the voltage, the current and the PWM duty ratio which are the same as those of the 3D display mode are adopted, the display device is always in a high-voltage and high-current state, so that the display device is seriously aged in the long-term use process, the service life of the display device is greatly reduced, however, the method of reducing the voltage and the current and improving the PWM duty ratio is adopted in the invention, when the 3D display is switched to the 2D display, under the condition that the display brightness is not changed, the PWM duty ratio is improved to 100%, and simultaneously the voltage and the current of the display device can be reduced to the corresponding proportion, so that different backlight control methods are adopted under, the display has the advantages that the brightness of the display is basically consistent under two display modes of 2D and 3D, the switching process is smooth and natural, the user experience is not influenced, the backlight working current is reduced by reducing the backlight driving voltage under the 2D display state, the power consumption of the display is reduced, and the overall service life of the display is prolonged.
A method for controlling backlight of a 3D display device, as shown in fig. 5, includes the following steps:
s1: and adjusting the backlight to a preset voltage value.
The user starts the liquid crystal display unit, the liquid crystal display unit displays a default 2D display mode, and the preset value is 47V when the backlight voltage is set to be in the 2D mode through software. The preset value of the voltage is 40V-60V in the embodiment, and the voltage is 47V according to the comfort degree of human eyes.
S2: the backlight control signal PWM duty is set.
The communication unit 13 is used for setting the duty ratio of the backlight control PWM to be 100 percent, the backlight control PWM is in a long-open state, the working current of the backlight is 60mA, and the brightness value of the liquid crystal display unit 17 is 100cd/m2As the display time increases, the operating current and the brightness of the LCD unit 17 will slightly fluctuate, but will settle at 60mA and 100cd/m, respectively2Left and right.
S3: and triggering and switching the 3D display mode.
In one embodiment, when the user needs to switch to 3D picture playing while playing the f3D file, the 3D picture is switched through the key unit 15, and the 3D display mode is triggered to enter.
In another embodiment, the liquid crystal display unit is manually triggered into the 3D display mode by a remote control.
In another embodiment, the liquid crystal display unit is triggered to enter the 3D display mode by sending a control command through a communication device such as a computer, a tablet, a mobile phone, etc.
In other embodiments, the video processing unit 10 further has a 2D/3D video format recognition function, and the video processing unit 10 automatically recognizes the video display format of the received video information and triggers the liquid crystal display unit 17 to enter the 3D display mode.
S4: the 3D mode backlight control signal PWM duty is set.
When the liquid crystal display unit 17 enters the 3D display mode state, since the images are refreshed and presented in a left-right alternating manner frame by frame in the 3D display mode, the left and right glasses of the 3D glasses are synchronously turned on and off, and the images corresponding to the left and right eyes are separated and provided to the user, in order to ensure the continuity of the pictures watched by the human eyes, the left and right eyes need to respectively obtain more than or equal to 50 frames per second, i.e. the refresh rate of the display is more than or equal to 100HZ, in this embodiment, the refresh rate of the display device is 120HZ, two pictures exist simultaneously in the left and right picture switching process due to the liquid crystal residue phenomenon, and the backlight is needed to be blackened in the period. Thus, through the black-out, the PWM duty is decreased, and the backlight control PWM duty adjustment is set to 40% by the video processing unit 10.
And S5, backlight driving voltage adjustment.
Since the PWM duty is less than 50% in the 3D display mode and is much smaller than the duty of 100% in the 2D mode, which is the default mode of the display, the video processing unit 10 outputs the display voltage and current parameter values according to the state information such as the gray scale, the chromaticity, and the luminance of the video at that time when switching to the 3D display mode, and the display luminance decreases after the PWM duty is reduced, which cannot meet the demand, and the display luminance is maintained at 100cd/m2On the left and right, the voltage of the liquid crystal display unit 17 is adjusted to 55V by the backlight driving unit 16 in accordance with the 2D display state luminance, so that the backlight LED operation current is increased to 150 mA.
S6: and triggering and switching the 2D display mode.
When the user plays the f3D file, the switching from the 3D video image to the 2D video image is required, in one embodiment, the 2D display mode is triggered by the switching of the 2D picture through the key unit 15.
In another embodiment, the liquid crystal display unit is manually triggered into the 2D display mode by a remote control.
In another embodiment, the liquid crystal display unit is triggered to enter the 2D display mode by sending a control command through a communication device such as a computer, a tablet, a mobile phone, etc.
In other embodiments, the video processing unit 10 further has a 2D/3D video format recognition function, and the video processing unit 10 automatically recognizes the video display format of the received video information and triggers the liquid crystal display unit 17 to enter the 2D display mode.
S7: the 2D mode backlight control signal PWM duty is set.
When the liquid crystal display unit 17 is triggered to enter the 2D display mode, the duty ratio of the liquid crystal display unit 17 may be adjusted to 100% due to the 2D mode for image presentation, and the backlight control PWM duty ratio is adjusted to 100% by the video processing unit 10. The luminance value of the liquid crystal display unit 17 is maintained at 100cd/m2In this case, the voltage of the liquid crystal display device is adjusted to 47V by the backlight driving unit 16 accordingly, so that the backlight operation current is reduced to 100 mA.
The 3D display device can show a 3D display mode by matching with 3D glasses, so that an immersive three-dimensional effect is achieved; however, 3D display is performed by overlapping a frame of picture left and right to present a 3D effect, so that when 3D display is performed, the PWM duty ratio cannot reach 100% or a larger ratio, and the brightness of the display is determined by the voltage, the current and the PWM duty ratio, so that there are two ways to reach a certain brightness, one is to increase the voltage and the current and reduce the PWM duty ratio, and the other is to reduce the voltage and the current and increase the PWM duty ratio, because the PWM duty ratio is less than 50% in the 3D display mode, under the condition of maintaining the 3D display effect, the voltage and the current are relatively high, and when the display mode is switched to the 2D display mode, the prior art adopts the same voltage, current and duty ratio, so that under the 2D display mode, the display device still needs to bear high voltage and current in the 3D display mode, and has great loss to the display device; according to the method, the driving voltage and current of the backlight LED are reduced in the 2D display mode, the backlight turn-on time (PWM duty ratio) is increased and adjusted to 100%, the driving voltage and current of the backlight LED are increased when the display is switched to the 3D display mode, the backlight turn-on time (PWM duty ratio) is reduced, and under the condition that the 3D display effect is guaranteed, the brightness of the display is basically consistent in the 2D display mode and the 3D display mode, the switching process is smooth and natural, the user experience is not influenced, and due to the fact that most of the time in the display application is in the 2D display mode, the backlight driving voltage in the 2D display state is reduced, the backlight working current is reduced, the power consumption of the display is reduced, and the overall service.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and within the technical spirit of the embodiments of the present invention, the technical solutions of the embodiments of the present invention may be simply modified, and the modifications are within the scope of the embodiments of the present invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A3D display device, comprising:
the video input unit is used for receiving HDMI video signals input by external equipment and comprises at least one HDMI interface;
the video processing unit is used for receiving the video signal transmitted by the video input unit and processing and controlling the sharpness, the chroma and the brightness of the transmitted video signal, and the video processing unit can program output current and voltage parameters;
a backlight driving unit for providing a stable driving current and voltage;
the liquid crystal display unit is used for providing plane uniform illumination normal display images through the backlight light source.
The communication unit is used for receiving an instruction of an external device to realize the on/off, brightness adjustment and 2D/3D display mode switching of the 3D display device, and the communication unit is used for feeding back state information of the 3D display device to the external device.
The 3D display device keeps consistent brightness in 2D and 3D display modes by controlling LED driving voltage and current in the backlight driving unit and PWM duty ratio of the video processing unit, does not influence user experience conditions, reduces power consumption of the 3D display device and prolongs the whole service life of the 3D display device.
2. The 3D display device according to claim 1, wherein the 3D display device further comprises a power management unit, an indication unit, and a key unit;
the power management unit is used for converting an input power into a plurality of groups of power with different voltages, supplying power to the video input unit, the video processing unit, the backlight driving unit, the liquid crystal display unit, the communication unit, the indicating unit and the key unit and ensuring the normal work of each unit;
the indicating unit is used for indicating the 3D display mode to be switched on or switched off and comprises at least one indicating lamp; when the 3D display device is triggered to be turned on, the indicator light is turned on, and when the 3D display device is turned off, the indicator light is turned off;
the key unit is used for inputting user information.
3. The 3D display device according to claim 2, wherein the key unit comprises a first key and a second key, the first key is used for realizing the opening and closing functions of the 3D display device; the second key is used for realizing the function of switching the 2D/3D display mode.
4. The 3D display device according to claim 1, the video processing unit being capable of recognizing a 2D video signal format and a 3D video signal format;
when a 2D video signal format is input, the video processing unit adjusts display configuration parameters and enters a 2D display mode;
when a 3D video signal format is input, the video processing unit adjusts video output configuration parameters and enters a 3D display mode.
5. The 3D display device according to claim 3, the video processing unit performs corresponding display mode switching by identifying 2D and 3D video signal format functions and by the second key;
the display mode switching can be automatically identified and automatically trigger the display of a 2D or 3D display mode through the video screen processing unit.
6. The 3D display device according to claim 1,
the HDMI interface can be a DP interface;
the HDMI interface can be a VGA interface;
the HDMI interface can be a DVI interface;
the HDMI interface can be any combination of one or more of an HDMI interface, a DP interface, a VGA interface and a DVI interface.
7. The 3D display device according to claim 1, the liquid crystal display unit comprising a liquid crystal panel and a backlight light source, the backlight light source being an LED light source.
8. The 3D display device according to claim 1, wherein the external device is a computer, a tablet computer, or a mobile phone.
9. A backlight control method, comprising the operational steps of:
step 1: adjusting the backlight to a preset voltage value;
step 2: setting a duty ratio of a backlight control signal PWM;
and step 3: triggering and switching a 3D display mode;
and 4, step 4: setting a PWM duty ratio of a 3D mode backlight control signal;
and 5: adjusting backlight driving voltage;
step 6: triggering and switching a 2D display mode;
and 7: the 2D mode backlight control signal PWM duty is set.
10. The backlight control method according to claim 9, wherein the triggering and switching of the 3D display mode comprises receiving a 3D display triggering command; the 2D display mode triggering and switching comprises receiving a 2D display triggering instruction.
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