CN111326119B - Driving method of backlight module in field sequential display device and field sequential display device - Google Patents
Driving method of backlight module in field sequential display device and field sequential display device Download PDFInfo
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- CN111326119B CN111326119B CN202010259181.5A CN202010259181A CN111326119B CN 111326119 B CN111326119 B CN 111326119B CN 202010259181 A CN202010259181 A CN 202010259181A CN 111326119 B CN111326119 B CN 111326119B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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Abstract
The invention discloses a driving method of a backlight module, a field sequence display device and VR equipment. One embodiment of the method comprises: acquiring the blink frequency of a user in unit time; adjusting the refreshing frequency of the backlight module to be integral multiple of the blinking frequency; and driving the backlight module according to the adjusted refreshing frequency. According to the embodiment, the refreshing frequency of the backlight module can be adaptively adjusted in real time according to the blinking frequency of the user, so that the condition that the picture seen before and after eye closing corresponds to light source light emitting with the same color when the user watches the picture is ensured, the color disorder of vision caused by blinking of the user is avoided, and the display effect and the watching experience are improved.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to a driving method of a backlight module, a field sequential display device and a VR apparatus.
Background
Currently, the main structure of the liquid crystal display device is a liquid crystal display panel, which includes an upper substrate and a lower substrate that are aligned with each other, and liquid crystal filled between the upper substrate and the lower substrate. The liquid crystal display device further comprises a driving circuit for driving the liquid crystal display panel, a backlight module for providing a surface light source for the liquid crystal display panel, a driving circuit for driving the backlight module and a control module for controlling the two driving circuits, wherein the control module is an MCU (micro control unit) microcontroller. The liquid crystal display device is classified into an RGB three-primary-color (red, green, blue) filter system based on a spatial color mixing principle and a color field sequential system based on a temporal color mixing principle.
The liquid crystal display device that uses a color field sequential mode to realize color display is called a field sequential color liquid crystal display (FSC-LCD) device, and may also be called a field sequential display device directly, and uses an inverter to drive three primary color light sources (red light source, green light source, and blue light source, usually red LED, green LED, and blue LED) to emit light in a time sequence, and in a frame of display screen, red light, green light, and blue light are emitted in sequence on the same pixel, so that the user's eyes generate an afterimage effect to make the three color lights form a color mixing effect, thereby forming a color display screen. Compared with a liquid crystal display device for realizing color display by adopting an RGB (red, green and blue) three-primary-color filter mode, the field sequence display device has the advantages that an expensive color film is not required to be arranged, so that the cost can be reduced, the loss of color resistance and transmission is avoided, the transmittance is high, the color saturation is good, the power consumption is low, higher resolution can be realized due to the fact that each pixel is not divided into three sub-pixels, and the like.
In summary, the field sequential display device is receiving more and more attention. However, the refresh frequency of the prior art field sequential display device is a fixed value, for example, 60Hz (the refresh frequency of the RGB three-primary-color light sources is also a fixed value, for example, 180Hz, respectively). Therefore, the user blinks when watching the picture, so that the picture seen before and after closing the eyes in the blinking action is corresponding to the light source light emitting with different colors, thereby causing the color disorder of the vision and influencing the display effect and the watching experience.
Therefore, it is desirable to provide a new driving method of a backlight module, a field sequential display device and a VR device.
Disclosure of Invention
The present invention provides a driving method of a backlight module, a field sequential display device and a VR device, so as to solve at least one of the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a driving method for a backlight module in a field sequential display device, including:
acquiring the blink frequency of a user in unit time;
adjusting the refreshing frequency of the backlight module to be integral multiple of the blinking frequency;
and driving the backlight module according to the adjusted refreshing frequency.
According to the driving method of the backlight module in the field sequential display device provided by the first aspect of the invention, the refreshing frequency of the backlight module can be self-adaptively adjusted in real time according to the blinking frequency of the user, so that the pictures seen before and after the eyes are closed during the blinking action of the user when the user watches the pictures are ensured to emit light corresponding to the light sources with the same color, the visual color disorder caused by the blinking of the user is avoided, and the display effect and the watching experience are improved.
Optionally, the adjusting the blinking frequency of the backlight module with the refresh frequency being an integer multiple includes: and adjusting the refresh frequency of the backlight module to be the integral multiple of the blink frequency and the numerical value closest to the refresh frequency before adjustment.
By adopting the optional mode, the change amplitude of the refreshing frequency of the backlight module is as small as possible, and the refreshing frequency of the backlight module can be quickly and accurately adjusted.
Optionally, the acquiring the blink frequency of the user in the unit time comprises: acquiring a face image sequence of a user; and detecting the blink frequency of the user in unit time according to the collected face image sequence in unit time, thereby obtaining the blink frequency of the user in unit time.
Optionally, the value range of the unit time is set to be 5s to 10 s.
By adopting the optional mode, the real-time performance of the refresh frequency adjustment can be ensured while the calculation efficiency is ensured and the calculation resources are not excessively occupied, so that the display effect and the watching experience are effectively improved.
A second aspect of the present invention provides a field sequential display device, including: the backlight module comprises a control module, a driving circuit and a backlight module;
the control module is used for acquiring the blink frequency of the user in unit time, adjusting the refresh frequency of the backlight module to be integral multiple of the blink frequency, and controlling the driving circuit to drive the backlight module according to the adjusted refresh frequency.
The field sequential display device provided by the second aspect of the invention can adaptively adjust the refresh frequency of the backlight module in real time according to the blinking frequency of the user, so that the frames seen before and after the eyes are closed during the blinking action of the user when the user views the frames are ensured to emit light corresponding to the light sources of the same color, thereby avoiding the visual color disorder caused by the blinking of the user, and improving the display effect and the viewing experience.
Optionally, the adjusting, by the control module, the blinking frequency of which the refresh frequency of the backlight module is an integer multiple includes: the control module is used for adjusting the refresh frequency of the backlight module to be an integral multiple of the blink frequency and a numerical value which is closest to the refresh frequency before adjustment.
By adopting the optional mode, the change amplitude of the refreshing frequency of the backlight module is as small as possible, and the refreshing frequency of the backlight module can be quickly and accurately adjusted.
Optionally, the apparatus further comprises an image collector for collecting a sequence of images of a face of the user; the control module is used for acquiring the blink frequency of the user in unit time and comprises the following steps: the control module is used for detecting and obtaining the blinking frequency of the user in unit time according to the collected face image sequence in unit time, so that the blinking frequency of the user in unit time is obtained.
Optionally, the controlling module is configured to control the driving circuit to drive the backlight module according to the adjusted refresh frequency, and includes: the control module is used for generating a control command according to the adjusted refreshing frequency and sending the control command to the driving circuit, so that the driving circuit outputs a driving current to the backlight module according to the control command and based on the adjusted refreshing frequency.
Optionally, the value range of the unit time is set to be 5s to 10 s.
By adopting the optional mode, the real-time performance of the refresh frequency adjustment can be ensured while the calculation efficiency is ensured and the calculation resources are not excessively occupied, so that the display effect and the watching experience are effectively improved.
A third aspect of the invention provides a VR device comprising the field sequential display apparatus provided by the second aspect of the invention.
The invention has the following beneficial effects:
according to the technical scheme, the refreshing frequency of the backlight module can be adaptively adjusted in real time according to the blinking frequency of the user, so that the pictures seen before and after eye closing during the blinking action of the user when the user watches the pictures are correspondingly illuminated by the light sources with the same color, the visual color disorder caused by the blinking of the user is avoided, and the display effect and the watching experience are improved.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
fig. 1 is a schematic diagram of a field sequential display device according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating the effect of avoiding visual color disorder by adjusting the refresh frequency of the backlight module.
Fig. 3 is a flowchart illustrating a driving method of a backlight module in a field sequential display device according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a field sequential display device, including: the backlight module comprises a control module 10, a driving circuit 20 and a backlight module 30, wherein the control module 10 can adopt an MCU (micro controller unit);
the control module 10 is configured to obtain a blink frequency of a user in a unit time, adjust the blink frequency of the backlight module 30 to be an integral multiple of the refresh frequency, and control the driving circuit 20 to drive the backlight module 30 according to the adjusted refresh frequency.
The control module 10 may adjust the refresh frequency of the backlight module 30 in real time according to the continuously acquired blink frequency of the user in the unit time, so as to adaptively adjust the refresh frequency of the backlight module 30 when the blink frequency of the user changes.
The field sequential display device provided by this embodiment can adaptively adjust the refresh frequency of the backlight module 30 in real time according to the blinking frequency of the user (viewer), so as to ensure that the images viewed by the user before and after eye closure during the blinking action correspond to the light source light emission of the same color when the user views the images, thereby avoiding color disorder of the vision caused by the blinking of the user, and improving the display effect and the viewing experience.
It can be understood that the field sequential display device provided in the present embodiment further includes a liquid crystal display panel 40 and a driving circuit (not shown in the figure) for driving the liquid crystal display panel 40, wherein the driving circuit for driving the liquid crystal display panel 40 can be controlled by the control module 10 or can be controlled by another control module, which is not limited in the present embodiment.
In some optional implementations of the present embodiment, the adjusting, by the control module 10, the blink frequency of the backlight module 30 to be an integer multiple includes: the control module 10 is configured to adjust the refresh frequency of the backlight module 30 to be an integer multiple of the blink frequency and a value closest to the refresh frequency before adjustment.
By adopting the implementation mode, the change amplitude of the refresh frequency of the backlight module 30 is as small as possible, which is beneficial to quickly and accurately adjusting the refresh frequency of the backlight module 30.
In a specific example, assuming that the current refresh frequency of the field sequential display device is 60Hz (the current refresh frequencies of the RGB three-primary-color light sources are 180Hz respectively), if the obtained blink frequency of the user in a unit time of 8 seconds is 0.35Hz, for example, the refresh frequency of the display module is adjusted to 0.35Hz × 171 — 59.85Hz (the refresh frequencies of the RGB three-primary-color light sources are adjusted to 59.85Hz × 3 — 179.55Hz respectively). As shown in fig. 2, the left image in fig. 2 is a captured display image after the refresh frequency of the display module is adjusted to 59.85Hz according to the blink frequency of the user who obtains 0.35Hz, and the right image is a display image after the refresh frequency of the display module keeps 60Hz, and the same area is respectively magnified by the same magnification and then is visible.
In some optional implementation manners of this embodiment, the apparatus further includes an image collector 50 for collecting a sequence of images of a face of the user, where the image collector 50 may adopt a high-sensitivity camera, and a setting position of the image collector is preferably a top center position of the liquid crystal display panel 40; the control module 10 is configured to obtain the blink frequency of the user in unit time, and includes: the control module 10 is configured to detect the blink frequency of the user in unit time according to the sequence of the collected face images in unit time, so as to obtain the blink frequency of the user in unit time. Further, in order to detect the blink frequency more accurately, the average of the number of blinks of the user in two or more consecutive unit times may be used as the number of blinks of the user in the unit time.
The method comprises the steps of acquiring a face image sequence of a user, namely acquiring face images of the user at fixed time intervals to form the face image sequence. The blink times of the user in the unit time can be obtained by detecting the face image sequence in the unit time by using various existing face detection technologies, for example: extracting a plurality of human eye features representing eyelid length and width of each frame of human face image in the human face image sequence in unit time; and acquiring the blinking times of the user in unit time according to the relationship between the plurality of human eye characteristics and the eye opening degree.
In some optional implementations of this embodiment, the controlling module 10 is configured to control the driving circuit 20 to drive the backlight module 30 according to the adjusted refresh frequency, and includes: the control module 10 is configured to generate a control command according to the adjusted refresh frequency and send the control command to the driving circuit 20, so that the driving circuit 20 outputs a driving current to the backlight module 30 according to the control command and based on the adjusted refresh frequency.
In some optional implementations of this embodiment, the value range of the unit time is set to be 5s to 10 s.
By adopting the implementation mode, the real-time performance of the refresh frequency adjustment can be ensured while the calculation efficiency is ensured and the calculation resources are not excessively occupied, so that the display effect and the watching experience are effectively improved.
When the field sequential display device in this embodiment is applied to the VR device, the relative position between the image collector 50 and the user is fixed and the distance is short, so that the blink frequency can be accurately detected, and therefore the field sequential display device provided by this embodiment is suitable for being applied to the VR device. Besides being applied to VR devices, the field sequential display device provided in this embodiment may also be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.
As shown in fig. 3, another embodiment of the present invention provides a driving method of a backlight module in a field sequential display device, including:
acquiring the blink frequency of a user in unit time;
adjusting the refreshing frequency of the backlight module to be integral multiple of the blinking frequency;
and driving the backlight module according to the adjusted refreshing frequency.
According to the driving method of the backlight module in the field sequential display device, provided by the embodiment, the refresh frequency of the backlight module can be adaptively adjusted in real time according to the blinking frequency of the user, so that the frames seen before and after the eyes are closed during the blinking action of the user when the user watches the frames are ensured to emit light corresponding to the light sources with the same color, the color disorder of the vision caused by the blinking of the user is avoided, and the display effect and the watching experience are improved.
In some optional implementations of this embodiment, the adjusting the blinking frequency of which the refresh frequency of the backlight module is an integer multiple includes: and adjusting the refresh frequency of the backlight module to be the integral multiple of the blink frequency and the numerical value closest to the refresh frequency before adjustment.
By adopting the implementation mode, the change amplitude of the refreshing frequency of the backlight module is as small as possible, and the refreshing frequency of the backlight module can be quickly and accurately adjusted.
In some optional implementations of this embodiment, the obtaining the blink frequency of the user per unit time includes: acquiring a face image sequence of a user; and detecting the blink frequency of the user in unit time according to the collected face image sequence in unit time, thereby obtaining the blink frequency of the user in unit time.
In some optional implementations of this embodiment, the value range of the unit time is set to be 5s to 10 s.
By adopting the implementation mode, the real-time performance of the refresh frequency adjustment can be ensured while the calculation efficiency is ensured and the calculation resources are not excessively occupied, so that the display effect and the watching experience are effectively improved.
It should be noted that the driving method of the backlight module in the field sequential display device provided in this embodiment is similar to the principle and the working flow of the field sequential display device, and reference may be made to the above description for relevant points, which is not described herein again.
In the description of the present invention, it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (8)
1. A driving method of a backlight module in a field sequential display device is characterized by comprising the following steps:
acquiring the blink frequency of a user in unit time;
adjusting the refreshing frequency of the backlight module to be integral multiple of the blinking frequency;
driving the backlight module according to the adjusted refreshing frequency;
the blink frequency for adjusting the refresh frequency of the backlight module to be integer multiples comprises: and adjusting the refresh frequency of the backlight module to be the integral multiple of the blink frequency and the numerical value closest to the refresh frequency before adjustment.
2. The method of claim 1, wherein obtaining the blink frequency for the user per unit of time comprises: acquiring a face image sequence of a user; and detecting the blink frequency of the user in unit time according to the collected face image sequence in unit time, thereby obtaining the blink frequency of the user in unit time.
3. The method according to claim 1, wherein the value range of the unit time is set to 5s to 10 s.
4. A field sequential display device, comprising: the backlight module comprises a control module, a driving circuit and a backlight module;
the control module is used for acquiring the blink frequency of the user in unit time, adjusting the refresh frequency of the backlight module to be integral multiple of the blink frequency, and controlling the driving circuit to drive the backlight module according to the adjusted refresh frequency;
the control module is used for adjusting the blinking frequency of the backlight module to be integer multiples, and the blinking frequency comprises the following steps: the control module is used for adjusting the refresh frequency of the backlight module to be an integral multiple of the blink frequency and a numerical value which is closest to the refresh frequency before adjustment.
5. The device of claim 4, further comprising an image collector for collecting a sequence of images of a face of the user; the control module is used for acquiring the blink frequency of the user in unit time and comprises the following steps: the control module is used for detecting and obtaining the blinking frequency of the user in unit time according to the collected face image sequence in unit time, so that the blinking frequency of the user in unit time is obtained.
6. The apparatus of claim 4, wherein the control module is configured to control the driving circuit to drive the backlight module according to the adjusted refresh frequency comprises: the control module is used for generating a control command according to the adjusted refreshing frequency and sending the control command to the driving circuit, so that the driving circuit outputs a driving current to the backlight module according to the control command and based on the adjusted refreshing frequency.
7. The apparatus of claim 4, wherein the value range of the unit time is set to 5s to 10 s.
8. A VR device comprising the field sequential display apparatus of any of claims 4-7.
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