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WO2019000157A1 - 一种液晶显示屏的背光功率控制方法及液晶显示屏 - Google Patents

一种液晶显示屏的背光功率控制方法及液晶显示屏 Download PDF

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Publication number
WO2019000157A1
WO2019000157A1 PCT/CN2017/089962 CN2017089962W WO2019000157A1 WO 2019000157 A1 WO2019000157 A1 WO 2019000157A1 CN 2017089962 W CN2017089962 W CN 2017089962W WO 2019000157 A1 WO2019000157 A1 WO 2019000157A1
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WIPO (PCT)
Prior art keywords
pulse width
backlight
led
modulation signal
width modulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/089962
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English (en)
French (fr)
Inventor
罗诚
韦育伦
王妙锋
王苗苗
禹秀泳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201780013528.4A priority Critical patent/CN108780627B/zh
Priority to PCT/CN2017/089962 priority patent/WO2019000157A1/zh
Publication of WO2019000157A1 publication Critical patent/WO2019000157A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight power control method for a liquid crystal display and a liquid crystal display.
  • a liquid crystal display is a liquid crystal layer placed on two parallel glass substrates, a thin film transistor (TFT) is disposed on the lower substrate glass, and a color filter is disposed on the upper substrate glass.
  • TFT thin film transistor
  • the direction of rotation of the liquid crystal molecules is controlled by the signal and voltage changes on the TFT, thereby achieving the purpose of controlling the polarization of each pixel to be emitted or not to achieve different colors.
  • CCFL Cathode Fluorescent Lamp
  • LED Light Emitting Diode
  • the advantage of LED is volume. Small, low power consumption, so using LED as a backlight, can achieve high brightness while taking into account the thin and light, the main reason is that the color performance is worse than CCFL.
  • this gap is shrinking. In view of the high requirements on the life time of mobile terminals, the vast majority of mobile terminal devices use LED light sources.
  • the display principle of the LCD is to change the driving voltage to change the transmittance of the liquid crystal layer to different gray scale pixels, that is, it takes a certain time to switch from a gray scale to an adjacent gray scale.
  • the slowest transition reaction time of the traditional LCD will be as high as 30 to 40 milliseconds, the effect is that the object showing fast motion will have obvious Smear; the slowest conversion response time of the fast LCD can be reduced to 5 to 6 milliseconds, and the backlighting black insertion technology can be used to reduce the smear by changing the normally bright display into a pulse type display.
  • liquid crystal layer transmittance of the fast LCD is lower than that of the conventional LCD, it is necessary to increase the power consumption of the backlight source to achieve the display brightness of the conventional LCD.
  • the embodiment of the present application provides a backlight power control method for a liquid crystal display and a liquid crystal display to solve the problem of high backlight consumption of the current fast LCD.
  • a first aspect of the present application provides a backlight power control method for a liquid crystal display.
  • the LCD first acquires an LED pulse width modulation signal of the LCD, and then the content to be displayed corresponding to the LED pulse width modulation signal.
  • CABC Content Adaptive Brightness Control
  • the LCD first acquires an LED pulse width modulation signal of the LCD, and then the content to be displayed corresponding to the LED pulse width modulation signal.
  • Performing Content Adaptive Brightness Control (CABC) processing to obtain a backlight reduction ratio of the backlight of the content to be displayed, and then adjusting at least the amplitude or the pulse width of the LED pulse width modulation signal according to the backlight reduction ratio One, making the pulse width of the adjusted LED pulse width modulation signal
  • the product of the degree and the amplitude is the backlight reduction ratio of the pulse width and the amplitude product of the LED pulse width modulation signal before the adjustment;
  • the LED backlight source emits a backlight according to the adjusted LED pulse width modulation signal, that is, according to the
  • the backlight is proportionally reduced.
  • the power consumption is reduced, so that the power consumption of the LED backlight source in accordance with the adjusted LED pulse width modulation signal is lower than that of the LED backlight source according to the LED pulse width modulation signal before the adjustment, thereby achieving the same power consumption.
  • the effect of reducing backlight power consumption is shown by the display effect.
  • a preset pulse width corresponding to the backlight reduction ratio is also obtained before adjusting at least one of the amplitude or the pulse width of the LED pulse width modulation signal according to the backlight reduction ratio.
  • the preset amplitude is a backlight reduction ratio of a pulse width of the LED pulse width modulation signal corresponding to the content to be displayed, and the preset amplitude is an LED pulse width modulation signal corresponding to the content to be displayed.
  • the magnitude of the backlight is reduced by the ratio. Setting the preset pulse width and the preset amplitude for the backlight reduction ratio enables the adjustment reference value to be made more convenient when adjusting at least one of the pulse width or the amplitude.
  • one of the pulse width and the amplitude is adjusted in such a manner that the pulse width or amplitude of the LED pulse width modulated signal is adjusted according to the backlight reduction ratio.
  • the pulse width adjustment may specifically shorten the pulse width of the LED pulse width modulation signal to a preset pulse width according to the backlight reduction ratio; the amplitude adjustment may specifically be to pulse width modulation of the LED according to the backlight reduction ratio.
  • the amplitude of the signal is reduced to a preset amplitude. It can be seen that when one of the pulse width and the amplitude is adjusted, it is only necessary to directly adjust to the corresponding preset pulse width or amplitude. It can realize rapid adjustment and enhance the achievability of the display backlight power control method.
  • the pulse width modulation signal there is another way to adjust only the pulse width, that is, adjusting the pulse width in the LED pulse width modulation signal to at least two sub-pulse widths having intervals according to the backlight reduction ratio,
  • the sum of the pulse widths of the at least two sub-pulse widths is the predetermined pulse width.
  • it is equivalent to replacing the pulse of the original LED pulse width modulation signal with a high frequency pulse, so that one pulse of the LED pulse width modulation signal becomes a plurality of sub-pulses, but the sum of the pulse widths of the sub-pulses is a preset pulse.
  • the width can also be achieved by the product of the pulse width and the amplitude of the adjusted LED pulse width modulation signal being the ratio of the backlight width of the LED pulse width modulation signal before the adjustment to the backlight.
  • the adjustment of the pulse width and the amplitude may be performed simultaneously, shortening a pulse width of the LED pulse width modulation signal to be greater than the preset pulse width according to the backlight reduction ratio, and reducing the The amplitude of the LED pulse width modulated signal is greater than the predetermined amplitude.
  • the values of the pulse width and the amplitude are simultaneously reduced, so that the product of the adjusted pulse width and the amplitude is the backlight reduction ratio of the product of the pulse width and the amplitude before the adjustment. Enhance the achievability of the display backlight power control method.
  • the adjustment of the pulse width and the amplitude may be performed simultaneously, shortening the pulse width of the LED pulse width modulation signal to be smaller than the preset pulse width according to the backlight reduction ratio, and increasing the The amplitude of the LED pulse width modulated signal.
  • the pulse width is adjusted to be smaller than the preset pulse width, and in order to make the product of the adjusted pulse width and the amplitude value is the backlight reduction ratio of the product of the pulse width and the amplitude before the adjustment, the amplitude is required. Make an increase. The achievability of the display backlight power control method can be enhanced.
  • the adjustment of the pulse width and the amplitude at the same time may further be: reducing the amplitude value of the LED pulse width modulation signal to be smaller than the preset amplitude according to the backlight reduction ratio, and increasing the The pulse width of the LED pulse width modulation signal.
  • the amplitude is adjusted to be smaller than the preset amplitude, and in order to make the product of the adjusted pulse width and the amplitude is the backlight reduction ratio of the product of the pulse width and the amplitude before the adjustment, the pulse width is required. Make an increase. The achievability of the display backlight power control method can be enhanced.
  • the second aspect of the present application further provides a liquid crystal display panel, which includes an LCD panel, and an LCD driver integrated circuit (IC) for electrically driving the LCD panel.
  • An LED backlight source is further disposed on the back surface of the LCD panel, and the LED backlight source is further connected to an LED driving IC for driving the LED backlight source, wherein the LCD driving IC is further connected to the LED driving IC, wherein
  • An LCD driver IC is configured to acquire an LED pulse width modulation signal of the LCD
  • the LCD driver IC is further configured to determine a backlight reduction ratio by using a content-corresponding backlight control CABC algorithm, where the backlight reduction ratio is a backlight reduction ratio of the backlight of the LED pulse width modulation signal corresponding to the to-be-displayed content;
  • the LCD driving IC is further configured to adjust at least one of a magnitude or a pulse width of the LED pulse width modulation signal according to the backlight reduction ratio, wherein a product of a pulse width and an amplitude of the adjusted LED pulse width modulation signal Decreasing the ratio of the backlight for multiplying the pulse width and amplitude of the LED pulse width modulation signal before adjustment;
  • the LED driving IC is configured to drive the LED backlight source to emit a backlight according to the adjusted LED pulse width modulation signal
  • the LCD panel is used to display the content to be displayed.
  • the LCD driver IC is further configured to acquire a preset pulse width and a preset amplitude, where the preset pulse width and the preset amplitude correspond to a backlight reduction ratio of the content to be displayed;
  • the preset pulse width is a backlight reduction ratio of a pulse width of the LED pulse width modulation signal corresponding to the content to be displayed;
  • the preset amplitude is an LED pulse width modulation signal corresponding to the content to be displayed. The amplitude of the backlight is reduced by the ratio.
  • the LCD driving IC is specifically configured to: shorten a pulse width of the LED pulse width modulation signal to a preset pulse width according to the backlight reduction ratio; or: convert the LED according to the backlight reduction ratio The amplitude of the pulse width modulated signal is reduced to a preset amplitude.
  • the LCD driving IC is specifically configured to adjust a pulse width in the LED pulse width modulation signal to at least two spaced sub-pulse widths according to the backlight reduction ratio, the at least two sub-pulse widths The sum of the pulse widths is the predetermined pulse width.
  • the LCD driving IC is specifically configured to shorten a pulse width of the LED pulse width modulation signal to be greater than the preset pulse width according to the backlight reduction ratio, and reduce the LED pulse width modulation signal.
  • the amplitude is greater than the preset amplitude.
  • the LCD driving IC is specifically configured to shorten a pulse width of the LED pulse width modulation signal to be smaller than the preset pulse width according to the backlight reduction ratio, and increase a width of the LED pulse width modulation signal. value.
  • the LCD driving IC is specifically configured to reduce the amplitude value of the LED pulse width modulation signal to be smaller than the preset amplitude according to the backlight reduction ratio, and increase the LED pulse width modulation signal. Pulse Width.
  • Yet another aspect of the present application provides a computer readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
  • Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • Figure 1 is a schematic diagram of a VR display system
  • FIG. 2 is a schematic diagram of gray scale conversion in a liquid crystal display
  • FIG. 3 is a schematic diagram showing a high-speed moving picture of a fast-reacting LCD display using a black insertion technique for a conventional LCD and VR;
  • Figure 4 is a schematic diagram of a fast response LCD using black insertion technology
  • Figure 5a is a schematic view showing the display without black insertion
  • Figure 5b is a schematic diagram of a black pulse display
  • FIG. 6 is a schematic structural diagram of a liquid crystal display according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a liquid crystal display according to an embodiment of the present application.
  • FIG. 8 is a diagram showing an embodiment of a backlight power control method of a liquid crystal display according to an embodiment of the present application.
  • Figure 9 is a schematic diagram of adjusting display content using CABC dynamic backlight
  • FIG. 10 is a diagram showing an embodiment of a backlight power control method of a liquid crystal display according to an embodiment of the present application.
  • FIG. 11 is a diagram showing an embodiment of a backlight power control method of a liquid crystal display according to an embodiment of the present application.
  • FIG. 12 is a diagram showing an embodiment of a backlight power control method of a liquid crystal display according to an embodiment of the present application.
  • FIG. 13 is a view showing an embodiment of a backlight power control method of a liquid crystal display panel according to an embodiment of the present application.
  • the embodiment of the present application provides a backlight power control method for a liquid crystal display and a liquid crystal display to solve the problem of high backlight consumption of the current fast LCD.
  • FIG. 1 is a schematic diagram of a VR display system.
  • the distance between the human eye 101 and the eyepiece 102 is L1, and the eyepiece is The distance from 102 to the display screen 103 is L2, and the distance from the human eye 101 to the virtual image plane 104 is L3, that is, a picture generated at a distance L3 in front of the human eye 101 perceived by the human, wherein the eyepiece 102 may be a Fresnel lens.
  • Threaded lens also known as a film made of polyolefin material, is also made of glass.
  • the surface of the lens is smooth, and the other side is filled with concentric circles from small to large. Its texture is based on light. Designed to deal with disturbances and relative sensitivity and receiving angle requirements, it can solve the phenomenon that the corners of ordinary convex lenses are darkened and blurred.
  • the display When the human head with the VR head is moved in different directions, the display will show an image of the change during the movement. For example, when the head moves to the left, the display will show a left to right.
  • the animation simulates the visual changes that the human eye will see in the real world.
  • the adoption is a fast-reacting liquid crystal display with backlight black insertion technology, and the slowest transition reaction event is 5-6 milliseconds. As shown in FIG. 2, FIG.
  • FIG. 2 is a schematic diagram of gray scale conversion in a liquid crystal display screen, wherein the abscissa is time and the ordinate is gray scale percentage, that is, if the gray scale has 256 steps from black to white, the black is 0% position. , white is 100% position.
  • the curve in the figure shows the process of liquid crystal transitioning from gray scale N to gray scale M, and then from gray scale M to gray scale N.
  • Gray scale N is represented by Gray (N) in Fig. 2, and gray scale is shown by Gray in Fig. 2.
  • (M) indicates that N is less than M, N and M are all first order of 256-order gray scale, Tr is the reaction time of gray scale N to gray scale M, and Tf is the reaction time of gray scale M to gray scale N.
  • FIG. 3 it is a schematic diagram of a high-speed moving picture of a fast-reacting LCD display using a black insertion technique for a conventional LCD and VR. It can be seen that the smear of a conventional LCD is relatively serious, and the rapid response LCD dragging using a black insertion technique is shown. There is almost no shadow. Among them, the pulse type can be achieved by using the backlight black insertion technology, so that the smear is greatly reduced compared with the constant brightness display.
  • FIG. 4 FIG. 5a and FIG. 5b, and FIG. 4 is a schematic diagram of the fast reaction LCD using the black insertion technology.
  • Figure 5a is a schematic diagram of a black-and-black display
  • Figure 5b is a schematic diagram of a black-pulse display
  • the P1 phase represents the backlight-off phase
  • the P2 phase represents the backlight-on phase
  • the P1 phase of the S1 phase is data.
  • a scanning phase in which the voltage of the gray scale to be displayed for each pixel is determined;
  • the S2 phase in the P1 phase is the liquid crystal response operation portion after the data scanning is completed; in this portion, each phase of the data scanning phase is followed.
  • the pixels need to display the gray scale voltage to rotate the liquid crystal to the corresponding angle.
  • the P2 phase can be executed to turn on the backlight for display; the P1 phase plus the P2 phase represents the duration of one frame, and it can be seen that each frame includes a backlight-off section and a backlight-on section, and Vsync indicates The synchronization of each frame, for example, the length of the backlight-on section is one tenth of the display time.
  • the data scanning phase and the liquid crystal response phase are actually parts that need not be seen by the user, that is, the part can be performed without turning on the backlight, and the black insertion technique is performed by using this feature.
  • Fig. 5a and Fig. 5b represent one pixel
  • Fig. 5a shows the display mode without black insertion
  • Fig. 5b shows the display mode with 50% black insertion, as can be seen in Fig. 5a and Fig. 5b, in the same
  • the smear length of the black-and-black display is 4 pixels
  • the smear length of the 50% black-out pulse display mode is only 2 pixels.
  • the backlight power consumption of the LCD is reduced, and the Light Adaptive Brightness Control (LABC) and CABC modes are adopted.
  • the brightness adaptation is usually used to adapt to the ambient light.
  • the VR system is basically not used.
  • the CABC technology recognizes the content and controls the backlight according to the content.
  • the CABC dynamic backlight adjusts the backlight according to the content of the specific display.
  • the analysis is performed to reduce the brightness of the backlight, and in order to ensure that the displayed content is substantially the same as the effect before the CABC adjustment is performed, the transmittance of the gray scale in the content needs to be adjusted to perform the brightness compensation.
  • the display brightness of the liquid crystal display perceived by the human eye is obtained by multiplying the luminance of the LED backlight source by the transmittance of the gray scale.
  • the penetration rate of a certain gray level is the voltage corresponding to the gray level of the level.
  • the brightness of the LED backlight source is 1000 units
  • the transmittance of the X-level gray scale is 60%
  • the value of the X is between 0 and 255
  • the display brightness of the liquid crystal display is 600 units.
  • the CABC calculation shows that the backlight can be reduced to 80%, that is, the backlight becomes 800 units, and in order to make the final display brightness still 600 units, it is necessary to adjust the transmittance of the X-level gray scale, such as the transmittance adjustment.
  • the final LCD display brightness is 800 units multiplied by 75%, still 600 units. Thereby, the luminance of the LED backlight source can be reduced without losing the display brightness.
  • CABC When using CABC, it is necessary to add a content analysis function to the LCD driver IC. Adding this function can be realized by software or by adding a specific content analysis circuit to the LCD driver IC to implement content analysis.
  • the specific work process of CABC is as follows:
  • the application processor sends the content to be displayed (for example, picture data) to the LCD driver IC, and the image data is analyzed by the content analysis function, and the backlight reduction ratio is determined according to a certain rule. For example, if the ratio of the dark or black portion exceeds a certain ratio in the image data, the backlight reduction ratio is set to a fixed value; of course, the rule may be preset when designing the content analysis function or the circuit, and In the LCD driver IC, a correspondence relationship between the backlight reduction ratio and the grayscale transmittance adjustment is also stored. Then, after determining the backlight reduction ratio, the gray scale transmittance adjustment is performed according to the correspondence between the backlight reduction ratio and the gray scale transmittance adjustment.
  • the LCD driver IC drives the LCD panel to adjust the gray scale.
  • the transmittance shows the content to be displayed
  • the backlight source of the LCD driving IC driving the LCD reduces the brightness of the backlight according to the backlight reduction ratio, so that the effect of the final displayed picture is substantially the same as that of the picture before the CABC. And because the brightness of the backlight source is lowered, the power consumption can be reduced. Therefore, this CABC technology is suitable for use on mobile devices that use batteries as a power source.
  • FIG. 6 is a schematic structural diagram of a liquid crystal display screen according to an embodiment of the present application.
  • the liquid crystal display comprises an LCD panel and an LED backlight source disposed on the back of the LCD panel. wherein the LCD panel is connected with an LCD driving IC, and the LED backlight source is connected with an LED driving IC for driving the LED backlight source, and the LCD driving IC is also connected. To the LED driver IC.
  • the specific working process of the liquid crystal display may be: the LCD driving IC receives the content to be displayed, the LCD driving IC generates a PWM signal, and then sends the PWM signal to the LED driving IC, and the LED driving IC drives the LED to emit light according to the PWM signal.
  • FIG. 7 is a schematic structural diagram of a liquid crystal display screen according to an embodiment of the present application, wherein the motherboard Partly there is an MPU or CPU, and an LED driver IC, which can be a WLED (white LED) driver IC, and the LCD module has an LCD panel, an LCD driver IC, and a plurality of LCD backlights disposed on the back of the LCD panel. LEDs, of course, these LEDs can also be WLEDs.
  • the specific working process may be that the MPU or the CPU sends the content to be displayed to the LCD driving IC, and then the LCD driving IC generates a PWM signal and sends it to the LED driving IC.
  • the LCD driver IC will output to the LCD panel according to the content to be displayed. Then, after receiving the PWM signal, the LED driver IC will adjust the current input to the LED to make the LED emit light.
  • FIG. 8 is a diagram of an embodiment of a backlight power control method for a liquid crystal display according to an embodiment of the present application.
  • the method may include:
  • the LCD driver IC acquires an LED pulse width modulation signal of the LCD.
  • the liquid crystal display adopts black insertion technology, so the LED signal outputted to the LED backlight source is an LED pulse width modulation signal, and the pulse width of the pulse width modulation signal is the duration of the backlight opening in the duration of one frame.
  • PWM is to control the on/off of the switching device of the inverter circuit, so that the output terminal obtains a series of pulse control modes with equal amplitude. If the amplitude is not changed, the width of each pulse of the PWM signal is modulated according to a certain rule, that is, the duty ratio of the pulse can be changed to change the output voltage of the inverter circuit. Of course, the adjustment of the pulse width can also change the PWM. The output frequency of the signal.
  • the method of PWM dimming by PWM technology is to change the on-time of the forward current by periodically turning on and off the LED to control the brightness time of the LED; since the brightness perceived by the human eye is a cumulative process, that is, in one cycle Inside, the greater the proportion of time the LED is brighter in the entire cycle, the brighter the human eye will feel. If the frequency of the LED light and dark exceeds 100 Hz, then the human eye sees the average brightness, instead of the LED flashing. At this time, when the amplitude is constant, when the pulse width is adjusted, increasing the pulse width will make the person The eye feels an increase in brightness, and conversely, it feels a decrease in brightness.
  • the operating frequency of the LED backlight source using the PWM dimming liquid crystal display is generally around 200Hz-1000Hz. Since the essence of PWM illumination is the process of “bright-off-bright-off”, it is equivalent to the visible light in the human eye.
  • the flicker impact when the PWM frequency is higher, that is, the higher the frequency of flicker, the weaker the perception of the impact on the human eye; at the same time, the higher the brightness, the less the perception of the blinking impact by the human eye.
  • the PWM dimming mode is different from the linear dimming mode that changes the LED brightness by changing the current of the LED.
  • the PWM dimming only makes the LED not work continuously, so that the LED brightness can be changed without changing the current.
  • the duration of one frame is different because of the different refresh rate.
  • the refresh rate of the LCD is set to 60hz, which means that the image displayed on the LCD is redrawn 60 times in one second.
  • the duration of one frame is 1/60 second.
  • the LCD refresh rate is 90hz, it means that the image displayed on the LCD is redrawn 90 times in one second.
  • the duration of one frame becomes 1/90. second.
  • the refresh rate may be an LCD exceeding 90 hz, which can effectively reduce the above symptoms.
  • the 802, LCD driver IC uses the CABC algorithm to determine the backlight reduction ratio.
  • the backlight reduction ratio is a backlight reduction ratio of the backlight of the LED pulse width modulation signal corresponding to the content to be displayed, and the CABC technology can adjust the backlight reduction ratio in real time according to the content to be displayed.
  • FIG. 9 is a schematic diagram of adjusting the display content using CABC dynamic backlight.
  • the first image 901 is an original image
  • the second image 903 is found to reduce the backlight brightness by 30% for the content analysis, and the grayscale penetration rate is advanced.
  • the corresponding adjustment is 10/7;
  • the first backlight brightness 902 is the original backlight brightness, and the second backlight brightness 903 is the backlight brightness after the content analysis is found to be able to dim the backlight brightness by 30%.
  • the image 905 combines the adjustment of the gray scale transmittance with the original 10/7 and the image that is finally displayed on the liquid crystal display when the backlight brightness is adjusted to the second backlight brightness 903, and the display effect of the third image 905 and the first image.
  • the display effect of the 901 is basically the same.
  • the reduction of 30% power consumption corresponds to a gray level increase of 30% is indicative, and the reduction of 30% power consumption does not necessarily increase the gray level of the picture by 30%.
  • the image will be used.
  • the actual content to determine the grayscale height ratio, the same reason, for the LED backlight source, the power consumption is reduced by 30% corresponding to the backlight brightness dimming 30% is also schematic, but in fact the power consumption is reduced by 30% does not necessarily correspond
  • the backlight brightness is dimmed by 30%, and the specific dimming ratio varies depending on the LED backlight source.
  • the LCD driving IC adjusts at least one of a magnitude or a pulse width of the LED pulse width modulation signal according to a backlight reduction ratio.
  • the amplitude or the pulse width of the LED pulse width modulation signal can be adjusted according to the ratio, and the adjusted LED pulse is adjusted.
  • the product of the pulse width and the amplitude of the width modulated signal is the backlight reduction ratio of the pulse width and amplitude product of the LED pulse width modulated signal before the adjustment. That is, if the backlight reduction ratio is 70%, that is, the backlight is reduced to 70% of the original backlight, at this time, the pulse width and amplitude product of the adjusted LED pulse width modulation signal is the pulse width of the LED pulse width modulation signal before adjustment. 70% of the product of the magnitude.
  • the pulse width is actually the duration of the backlight illumination, and the amplitude is actually the current value when the backlight is lit, that is, the product is physically the product of current and time.
  • the minimum duration unit of the CABC adjustment may be the duration of one frame
  • the LED pulse width modulation signal acquired by the liquid crystal display to be transmitted is an LED pulse width modulation signal including at least one frame consecutively. That is, different frames on one LED pulse width modulation signal can adopt different CABC adjustments, thereby achieving the effect of adjusting the backlight reduction ratio in real time according to the content to be displayed.
  • the preset pulse width and the preset amplitude corresponding to the backlight reduction ratio are further set in the liquid crystal display, and the preset pulse width and the preset amplitude have multiple acquisition manners, such as the preset.
  • the pulse width and the preset amplitude are directly stored on the LED driver IC.
  • it can also be stored in the memory that the LED driver IC can read data, and the specific manner is not limited.
  • the preset pulse width is a backlight reduction ratio of a pulse width of the LED pulse width modulation signal corresponding to the content to be displayed; that is, it is equivalent to adjusting only the pulse width such that the product of the pulse width and the amplitude reaches a backlight reduction ratio;
  • the threshold is set as the backlight reduction ratio of the amplitude of the LED pulse width modulation signal corresponding to the content to be displayed, that is, the amplitude is adjusted so that the product of the pulse width and the amplitude reaches the backlight. Reduce the ratio.
  • the manner in which the liquid crystal display adjusts the amplitude and/or the pulse width of the LED pulse width modulation signal according to the backlight reduction ratio may be as follows. Be explained.
  • the pulse width is adjusted. There are two different types of situations in this way, the first case is to shorten the pulse width. The second is to replace the original one by at least two sub-pulses spaced at a higher frequency than the LED pulse width modulated signal. The following is explained:
  • step 803 can be changed to the LED pulse width according to the backlight reduction ratio.
  • the pulse width of the modulated signal is shortened to a preset pulse width. That is, the pulse width can be shortened to the preset pulse width directly according to the backlight reduction ratio without adjusting the amplitude.
  • FIG. 10 is a schematic diagram of a backlight power control method for a liquid crystal display according to an embodiment of the present application
  • FIG. 11 is an implementation of a backlight power control method for a liquid crystal display according to an embodiment of the present application.
  • FIG. 10 and FIG. 11 both show pulse waveform diagrams of the duration of two frames.
  • the backlight reduction ratio is 70%, the abscissa is time, and the ordinate is current; wherein the solid line indicates adjustment After the LED pulse width modulation signal, the dotted line indicates the LED pulse width modulation signal before adjustment; the difference between Figure 10 and Figure 11 is that the actual adjustment mode is slightly different.
  • the rising edge of the pulse is fixed and the falling edge will be In advance, the product of the pulse width and the amplitude is 70% of the product of the pulse width and the amplitude before the adjustment; in Fig. 11, the falling edge is fixed, and the rising edge is delayed, and the pulse width and amplitude can also be realized.
  • the product of the product is 70% of the product of the pulse width and amplitude before the adjustment.
  • Step 603 may be configured to adjust a pulse width in the LED pulse width modulation signal to at least two sub-pulse widths having intervals according to the backlight reduction ratio, and a sum of pulse widths of the at least two sub-pulse widths is The preset pulse width.
  • the sum of the widths corresponding to the widths of the at least two sub-pulses is 70% of the pulse width of the LED pulse width modulation signal before the adjustment.
  • FIG. 12 is a diagram showing an embodiment of a backlight power control method for a liquid crystal display according to an embodiment of the present application, wherein FIG.
  • FIG. 12 shows a pulse waveform of a duration of two frames, and FIG. 12 is reduced by a backlight.
  • 70% the abscissa is time, the ordinate is current; the bottom of Fig. 12 is an enlarged view of the pulse of the first frame, wherein the solid line indicates the adjusted LED pulse width modulation signal, and the broken line indicates the LED pulse before adjustment.
  • Width modulation signal it can be seen that by adjusting one pulse to a plurality of sub-pulses having the same amplitude, the pitch of these sub-pulses is not limited as long as the sum of the pulse widths of the sub-pulses reaches the LED pulse width modulation signal before adjustment.
  • the 70% of the pulse width can be achieved, and the product of the pulse width and the amplitude of these sub-pulses can be achieved and the result of the accumulation is 70% of the product of the pulse width and the amplitude before the adjustment.
  • step 603 may be changed to reduce the amplitude of the LED pulse width modulation signal to a preset amplitude according to the backlight reduction ratio. That is, the amplitude can be reduced to a preset amplitude directly according to the backlight reduction ratio without adjusting the pulse width.
  • FIG. 13 is a diagram of an embodiment of a backlight power control method for a liquid crystal display according to an embodiment of the present disclosure, wherein FIG. 13 shows a pulse waveform of a duration of two frames, and FIG. 13 is reduced by a backlight.
  • the abscissa is time, the ordinate is current; the solid line indicates the adjusted LED pulse width modulation signal, and the broken line indicates the LED pulse width modulation signal before adjustment; it can be seen that the amplitude is directly reduced
  • the pulse width and amplitude are adjusted at the same time.
  • the first one is that the adjusted pulse width is greater than the preset pulse width and the adjusted amplitude is greater than The preset amplitude.
  • the second is that the adjusted pulse width is smaller than the preset pulse width and the adjusted amplitude is increased relative to the amplitude before the adjustment.
  • the third type is that the adjusted pulse width is increased relative to the pulse width before the adjustment and the adjusted amplitude is less than the preset amplitude.
  • the product of the pulse width and the amplitude before or after the adjustment actually represents the area of the pulse.
  • the ratio of the area before and after the adjustment directly corresponds to the ratio of the backlight reduction.
  • the backlight reduction ratio is 70%
  • actually the area of one pulse of the LED pulse width modulation signal before adjustment is reduced to the original 70. %.
  • the dimensions are adjusted, ie pulse width and amplitude. Therefore, among the three cases in the third category, the first one is to make the area satisfy the requirement of 70% before the adjustment by reducing the pulse width and the amplitude on the basis of the original, the second type.
  • the pulse width is shortened and the amplitude is increased so that the area satisfies the requirement of 70% before the adjustment.
  • the third is to increase the pulse width and reduce the amplitude on the basis of the original so that the area meets the requirement of 70% before the adjustment.
  • the LCD driving IC outputs the adjusted LED pulse width modulation signal to the LED driving IC.
  • the adjusted LED pulse width modulation signal is sent to the LED driver IC, so that the LED driver IC drives the LED backlight source to emit light.
  • the LED driving IC controls the LED backlight source to emit light according to the adjusted LED pulse width modulation signal.
  • the LED driving IC supplies power to the LED backlight source according to the adjusted pulse of the LED pulse width modulation signal according to the adjusted LED pulse width modulation signal.
  • the LED backlight source is caused to emit backlight according to the adjusted LED pulse width modulation signal.
  • the LED backlight source emits a backlight according to the adjusted LED pulse width modulation signal.
  • the LED pulse width modulation signal can be sent to the LED backlight source, and the LED backlight source emits a backlight according to the adjusted LED pulse width modulation signal, thereby causing the LCD to display
  • the content to be displayed is basically the same as the effect of the content to be displayed which is displayed by the backlight according to the LED pulse width modulation signal before the adjustment, that is, the loss of the image display quality is within a preset acceptable range.
  • the embodiment shown in FIG. 8 is an implementation manner of the liquid crystal display panel using the backlight power control method of the embodiment of the present application.
  • the LCD driver IC determines the backlight reduction ratio by the CABC algorithm, and adjusts the LED pulse width modulation signal.
  • an adjustment IC can be designed separately. Please refer to FIG. 10 and FIG. The IC connection diagram of the embodiment of the present application, wherein the adjustment IC is located between the LCD driver IC and the LED driver IC.
  • the LED driver module first generates an LED pulse width modulation signal, and the adjustment IC receives the LED.
  • the backlight reduction ratio is determined by the CABC algorithm, and then the pulse width and amplitude of the LED pulse width modulation signal are adjusted to obtain the adjusted LED pulse width modulation signal, which is then sent to the LED driver. IC.
  • the adjustment IC may be a chip specially designed for the CABC algorithm and adjusting the LED pulse width modulation signal, or another LCD driver IC capable of receiving the LED pulse width emitted by the previous LCD driver IC. Modulated signal.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center By wire (example Transmission to another website site, computer, server or data center, such as coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • DSL digital subscriber line
  • the computer readable storage medium can be any available media that can be stored by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in the embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

一种液晶显示屏的背光功率控制方法及液晶显示屏。该方法包括LCD获取LCD的LED脉冲宽度调制信号；LCD采用内容适应背光控制（CABC）算法确定背光降低比例；LCD根据背光降低比例调整LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个；LCD内的LED背光光源根据调整后的LED脉冲宽度调制信号发出背光。由于按照计算出的背光降低比例对该LED脉冲宽度调制信号的宽度或幅值之中的至少一个进行调整，从而达到在相同的显示效果下降低背光功耗的目的。

Description

一种液晶显示屏的背光功率控制方法及液晶显示屏 技术领域
本申请涉及液晶显示屏技术领域，具体涉及一种液晶显示屏的背光功率控制方法及液晶显示屏。
背景技术
液晶显示屏(Liquid Crystal Display，简称LCD)是在两片平行的玻璃基板当中放置液晶层，下基板玻璃上设置薄膜晶体管(Thin Film Transistor，简称TFT)，上基板玻璃上设置彩色滤光片，通过TFT上的信号与电压改变来控制液晶分子的转动方向，从而达到控制每个像素点偏振光出射与否而达到显示不同颜色的目的。
由于LCD本身并不会发光，即需要让用户看到LCD上的显示内容需要在LCD的背面提供背光光源，目前的常见的LCD的背光光源有两种，一种是采用冷阴极荧光灯管(Cold Cathode Fluorescent Lamp，简称CCFL)作为背光光源，CCFL的优势是色彩表现好，不足在于功耗较高；另一种是采用发光二极管(Light Emitting Diode，简称LED)作为背光光源，LED的优势是体积小、功耗低，因此用LED作为背光源，可以在兼顾轻薄的同时达到较高的亮度，其不足主要是色彩表现比CCFL差。但是随着LED技术的发展，这种差距正在缩小，而鉴于目前的移动终端设备对设备续航时间要求较高，因此绝大多数的移动终端设备均采用的LED光源。
另外，对于LCD来说，由于LCD的显示原理是透过改变驱动电压来改变液晶层穿透率达到不同的灰阶画素，即从一个灰阶转换到相邻的灰阶是需要一定的时间的，而衡量一个LCD的灰阶转换时间则是其最慢阶的转换时间，传统LCD的最慢阶的转换反应时间会高达30～40毫秒，造成的效果就是显示快速运动的物体会有明显的拖影；快速LCD的最慢阶的转换反应时间则能够降低到5～6毫秒，再搭配背光插黑技术将常亮型显示变成脉冲型显示即可有效降低拖影。
但是由于快速LCD的液晶层穿透率比传统的LCD低，必须要提高背光光源的功耗才能达到传统LCD的显示亮度。
发明内容
本申请实施例提供了一种液晶显示屏的背光功率控制方法及液晶显示屏来解决目前快速LCD的背光消耗高的问题。
本申请实施例的第一方面提供一种液晶显示屏的背光功率控制方法，该方法中，LCD首先会获取该LCD的LED脉冲宽度调制信号，接着对该LED脉冲宽度调制信号对应的待显示内容进行内容适应背光技术(Content Adaptive Brightness Control，简称CABC)处理得到该待显示内容的背光的背光降低比例，接着，按照该背光降低比例调整LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个，使得调整后的LED脉冲宽度调制信号的脉冲宽 度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的背光降低比例；最后，LED背光光源会按照调整后的LED脉冲宽度调制信号发出背光，即按照该LED脉冲宽度调制信号的脉冲宽度和幅值发光。
可以看出，由于在LED脉冲宽度调制信号发出之前便按照计算出的背光降低比例对该LED脉冲宽度调制信号的宽度或幅值之中的至少一个进行调整，而背光按照比例降低则会带来功耗的降低，从而实现LED背光光源在按照该调整后的LED脉冲宽度调制信号发光的功耗比LED背光光源按照调整前的LED脉冲宽度调制信号发光的功耗要低，从而达到在相同的显示效果下降低背光功耗的目的。
在一些实施例中，在根据所述背光降低比例调整所述LED脉冲宽度调制信号的幅值或脉冲宽度中的至少一个之前，还会先获取对应所述背光降低比例的预设的脉冲宽度和预设的幅值。其中，所述预设的脉冲宽度为所述待显示内容对应的LED脉冲宽度调制信号的脉冲宽度的背光降低比例，所述预设的幅值为所述待显示内容对应的LED脉冲宽度调制信号的幅值的背光降低比例。针对背光降低比例设置预设的脉冲宽度和预设的幅值能够使得在对脉冲宽度或幅值中的至少一个进行调整时，能够作为调整参考值，使得调整更为便捷。
在一些实施例中，调整脉冲宽度和幅值中的一个的方式，即根据所述背光降低比例调整所述LED脉冲宽度调制信号的脉冲宽度或幅值。脉冲宽度调整具体可以是根据所述背光降低比例将所述LED脉冲宽度调制信号的脉冲宽度缩短为预设的脉冲宽度；幅值调整具体可以是根据所述背光降低比例将所述LED脉冲宽度调制信号的幅值减小为预设的幅值。可以看出，单调整脉冲宽度和幅值中的一个时，仅需直接调整至对应的预设的脉冲宽度或者幅值即可。能够实现快速调整，增强显示器背光功率控制方法的可实现性。
在一些实施例中，仅对脉冲宽度的调整还有另一种方式，即根据所述背光降低比例将所述LED脉冲宽度调制信号中的脉冲宽度调整为至少两个具有间隔的子脉冲宽度，所述至少两个子脉冲宽度的脉冲宽度之和为所述预设的脉冲宽度。此方式中，相当于用高频脉冲代替原本的LED脉冲宽度调制信号的脉冲，使得LED脉冲宽度调制信号的一个脉冲变为多个子脉冲，但是这些子脉冲的脉冲宽度之和为预设的脉冲宽度，同样能够达到调整后的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的所述背光降低比例这一目的。
在一些实施例中，同时对脉冲宽度和幅值的调整可以是，根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉冲宽度至大于所述预设的脉冲宽度，并减小所述LED脉冲宽度调制信号的幅值至大于所述预设的幅值。即此方式中，同时将脉冲宽度和幅值的值变小，从而达到调整的脉冲宽度和幅值的乘积是调整前的脉冲宽度和幅值的乘积的背光降低比例。增强显示器背光功率控制方法的可实现性。
在一些实施例中，同时对脉冲宽度和幅值的调整还可以是，根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉宽至小于所述预设的脉冲宽度，并增加所述LED脉冲宽度调制信号的幅值。此方式中，是将脉冲宽度调整至小于预设的脉冲宽度，而为了使得调整的脉冲宽度和幅值的乘积是调整前的脉冲宽度和幅值的乘积的背光降低比例，则需要对幅值进行增加。能够增强显示器背光功率控制方法的可实现性。
在一些实施例中，同时对脉冲宽度和幅值的调整还可以是，根据所述背光降低比例减小所述LED脉冲宽度调制信号的幅值值小于所述预设的幅值，并增加所述LED脉冲宽度调制信号的脉冲宽度。此方式中，是将幅值调整至小于预设的幅值，而为了使得调整的脉冲宽度和幅值的乘积是调整前的脉冲宽度和幅值的乘积的背光降低比例，则需要对脉冲宽度进行增加。能够增强显示器背光功率控制方法的可实现性。
本申请实施例第二方面还提供一种液晶显示屏，该包括LCD面板，与所述LCD面板电连接的用于驱动所述LCD面板的LCD驱动集成电路(Integrated circuit，简称IC)，所述LCD面板的背面还设有LED背光光源，所述LED背光光源上还连接有驱动所述LED背光光源的LED驱动IC，所述LCD驱动IC还与所述LED驱动IC相连接，其中，
LCD驱动IC用于获取所述LCD的LED脉冲宽度调制信号；
LCD驱动IC还用于采用内容对应背光控制CABC算法确定背光降低比例，所述背光降低比例为所述LED脉冲宽度调制信号对应的待显示内容的背光的背光降低比例；
LCD驱动IC还用于根据所述背光降低比例调整所述LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个，其中，调整后的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的所述背光降低比例；
LED驱动IC用于根据调整后的LED脉冲宽度调制信号驱动所述LED背光光源发出背光；
LCD面板用于显示待显示内容。
在一些实施例中，LCD驱动IC还用于获取预设的脉冲宽度和预设的幅值，所述预设的脉冲宽度和预设的幅值对应所述待显示内容的背光降低比例；其中，所述预设的脉冲宽度为所述待显示内容对应的LED脉冲宽度调制信号的脉冲宽度的背光降低比例；所述预设的幅值为所述待显示内容对应的LED脉冲宽度调制信号的幅值的背光降低比例。
在一些实施例中，LCD驱动IC具体用于：根据所述背光降低比例将所述LED脉冲宽度调制信号的脉冲宽度缩短为预设的脉冲宽度；或者是根据所述背光降低比例将所述LED脉冲宽度调制信号的幅值减小为预设的幅值。
在一些实施例中，LCD驱动IC具体用于根据所述背光降低比例将所述LED脉冲宽度调制信号中的脉冲宽度调整为至少两个具有间隔的子脉冲宽度，所述至少两个子脉冲宽度的脉冲宽度之和为所述预设的脉冲宽度。
在一些实施例中，LCD驱动IC具体用于根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉冲宽度至大于所述预设的脉冲宽度，并减小所述LED脉冲宽度调制信号的幅值至大于所述预设的幅值。
在一些实施例中，LCD驱动IC具体用于根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉宽至小于所述预设的脉冲宽度，并增加所述LED脉冲宽度调制信号的幅值。
在一些实施例中，LCD驱动IC具体用于根据所述背光降低比例减小所述LED脉冲宽度调制信号的幅值值小于所述预设的幅值，并增加所述LED脉冲宽度调制信号的脉冲宽度。
本申请的又一方面提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
本申请的又一方面提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
图1是VR显示系统的示意图；
图2是液晶显示屏中灰阶转换示意图；
图3所示是传统LCD和VR用的采用插黑技术的快速反应LCD显示高速运动画面的示意图；
图4是快速反应LCD使用插黑技术的示意图；
图5a是无插黑常亮显示的示意图；
图5b是有插黑脉冲显示的示意图；
图6是本申请实施例的液晶显示屏的架构示意图；
图7是本申请实施例的液晶显示屏的架构示意图；
图8是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图；
图9是采用CABC动态背光调节显示内容的示意图；
图10是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图；
图11是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图；
图12是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图；
图13是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图。
具体实施方式
本申请实施例提供了一种液晶显示屏的背光功率控制方法及液晶显示屏来解决目前快速LCD的背光消耗高的问题。
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例进行描述。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”或“具有”及其任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
在虚拟现实(Virtual Reality，VR)领域，目前主要采用头显的方式，即在一个头显中通过设置一块或者两块显示屏分别向两眼显示不同的两幅图像，这两幅不同的图像均由该显示屏的显示芯片来驱动，两幅图像有细微的差别，该差别类似人的双眼视差，人眼到显示屏之间通过一个透镜产生一个放大的虚像来仿真，从而产生真实世界的沉浸感，具体，请参阅图1，图1是VR显示系统的示意图，人眼101到目镜102之间的距离为L1，目镜 102到显示屏103之间的距离为L2，人眼101到虚像面104的距离为L3，即人感知的人眼101前方的L3距离处产生的画面，其中该目镜102可以是菲涅尔透镜，又名螺纹透镜，多是由聚烯烃材料注压而成的薄片，也有玻璃制作的，镜片表面一面为光面，另一面刻录了由小到大的同心圆，它的纹理是根据光的干涉及扰射以及相对灵敏度和接收角度要求来设计的，能够解决普通凸透镜边角变暗、模糊的现象。
当戴有VR头显的人体头部向不同方向移动时，显示屏上会显示出移动过程中的变化的图像，例如，头部向左运动时，显示屏上会显示一个由左往右的动画仿真人眼在真实世界会看到的视觉画面变化。然而由于是运动甚至高速移动的画面，在传统的LCD上显示此类内容时，画面会有严重的拖影存在，会导致使用VR的用户产生晕眩和恶心的问题，所以VR头显一般来说采用是具有背光插黑技术的快速反应液晶显示器，其最慢阶的转换反应事件为5～6毫秒。如图2所示，图2是液晶显示屏中灰阶转换示意图，其中图中横坐标为时间，纵坐标为灰阶百分比，即若灰阶从黑到白有256阶，黑色为0％位置，白色为100％位置。图中的曲线表示液晶从灰阶N转换到灰阶M，再从灰阶M转换到灰阶N的过程，灰阶N图2中以Gray(N)表示，灰阶M图2中以Gray(M)表示，其中N小于M，N和M均是256阶灰阶中的一阶，Tr为灰阶N到灰阶M的反应时间，Tf为灰阶M到灰阶N的反应时间。
如图3所示是传统LCD和VR用的采用插黑技术的快速反应LCD显示高速运动画面的示意图，可以看出，传统LCD的拖影比较严重，而采用插黑技术的快速反应LCD的拖影几乎没有。其中，利用背光插黑技术可达到脉冲型，从而相比于常亮显示的拖影大大减小，具体可参见图4、图5a和图5b，图4是快速反应LCD使用插黑技术的示意图，图5a是无插黑常亮显示的示意图；图5b是有插黑脉冲显示的示意图；图4中，P1阶段表示背光关闭阶段，P2阶段表示背光开启阶段，P1阶段中的S1阶段是数据的扫描阶段，该阶段中，会确定每个像素需要显示的灰阶的电压；P1阶段中的S2阶段是在数据扫描完成后的液晶响应操作部分；在该部分中会按照数据扫描阶段的每个像素需要显示的灰阶电压将液晶转动至相应的角度。在完成这两部分操作之后，即可执行P2阶段开启背光进行显示；P1阶段加P2阶段即表示一帧的时长，可以看出每一帧画面包括背光关闭区段和背光开启区段，Vsync表示每一帧的同步，例如，背光开启区段的长度为一祯显示时间的十分之一。
可以看出，实际上数据扫描阶段和液晶响应阶段是不需要被用户看到的部分，即此部分可以不开启背光的情况下进行即可，而插黑技术则是采用此特点进行的。
图5a和图5b中每个小方格表示一个像素，图5a是无插黑的显示方式，图5b是采用50％插黑的显示方式，对比图5a和图5b中可以看出，在同一帧的情况下，无插黑常亮显示的拖影长度有4个像素，而采用50％插黑的脉冲显示方式的拖影长度仅有2个像素。
另外，对于传统的LCD来说，降低LCD的背光功耗还有环境光侦测适应背光控制(Light Adaptive Brightness Control，简称LABC)和CABC两种方式，亮度自适应通常用于适应环境光，在VR系统的情况下基本用不到，CABC技术是通过识别内容，并根据内容对背光进行控制。
其中，CABC动态背光调节的是根据具体显示的内容来调整背光。通过对待显示的内 容进行分析，将背光亮度降低，同时为了保证显示的内容与未进行CABC调整之前的效果基本相同，则需要调整内容中灰阶的穿透率来进行亮度补偿。对于液晶显示屏来说，人眼感受到的液晶显示屏的显示亮度是由LED背光光源的发光亮度乘以灰阶的穿透率得到的。其中某一级灰阶的穿透率即该级灰阶对应的电压。
举例来说，LED背光光源的亮度为1000单位，X级灰阶的穿透率为60％，该X的取值为0到255之间，则最终液晶显示屏的显示亮度为600单位。若通过CABC计算发现背光可以降低到80％，即背光变为800单位，而为了使得最终的显示亮度仍然为600单位，则需要对X级灰阶的穿透率进行调整，如穿透率调整为75％(实际是对电压的调整)，则最终液晶显示屏的显示亮度为800单位乘以75％，仍然为600单位。从而达到在不损失显示亮度的情况下，降低LED背光光源的发光亮度。
在使用CABC时，需要在LCD驱动IC上增加内容分析的功能，增加该功能可以通过软件实现也可以通过在LCD驱动IC中增加特定的内容分析电路实现内容分析的功能。CABC的具体工作过程如下：
首先由应用处理器向LCD驱动IC发送待显示内容(例如图片数据)，由内容分析功能分析该图片数据，并按照一定的规则确定出背光降低比例。该规则例如分析该图片数据中，暗色或者黑色部分的比例超过一定比例，则将背光降低比例设为一个固定的值；当然该规则可以在设计内容分析功能或电路时预先设定的，此外，在该LCD驱动IC中，还存储有背光降低比例与灰阶的穿透率调整的对应关系。接着，在确定出背光降低比例后，便按照背光降低比例与灰阶的穿透率调整的对应关系进行灰阶的穿透率调整，最后LCD驱动IC驱动LCD面板以该调整后的灰阶的穿透率显示待显示的内容，并且LCD驱动IC驱动LCD的背光光源按照背光降低比例降低背光亮度，使得最终显示的图片的效果与进行CABC之前的图片的效果基本上是相同的。而由于降低了背光光源的亮度，能够降低电量消耗。因此，这种CABC技术适合用在采用电池作为电源的移动设备上。
由于快速反应液晶显示屏的特点决定其背光功耗会比较高，为了解决此问题，本申请实施例提供了一种快速反应液晶显示屏的背光功率控制方法即液晶显示屏来解决背光功耗会比较高的问题。首先对本申请的液晶显示屏的架构进行说明，请参阅图6，图6是本申请实施例的液晶显示屏显示屏的架构示意图。该液晶显示屏的包括LCD面板和设置在LCD面板背面的LED背光光源，其中，LCD面板上连接有LCD驱动IC，LED背光光源连接有驱动该LED背光光源的LED驱动IC，LCD驱动IC还连接至LED驱动IC。此液晶显示屏的具体工作过程可以是，LCD驱动IC接收待显示内容，LCD驱动IC产生PWM信号，接着将该PWM信号发送至LED驱动IC，LED驱动IC根据该PWM信号驱动LED发光。
需要说明的是，LED驱动IC和LCD驱动IC可以设置在不同的功能模块上，具体的，可参阅图7，图7是是本申请实施例的液晶显示屏显示屏的架构示意图，其中，主板部分上设有MPU或者CPU，以及LED驱动IC，该LED驱动IC可以是WLED(white LED)驱动IC，而LCD模组上则设有LCD面板、LCD驱动IC以及设置在LCD面板背面的多个LED，当然，这些LED也可以是WLED。该具体工作过程可以是MPU或者CPU向LCD驱动IC发送待显示的内容，接着LCD驱动IC一方面生成PWM信号发送给LED驱动IC， 另一方面LCD驱动IC还会按照待显示内容向LCD面板输出，接着，LED驱动IC在接收PWM信号后，同时会调整向LED输入的电流，使得LED发光。
下面对本申请实施例的液晶显示屏的背光功率控制方法，本申请实施例的液晶显示屏的背光功率控制方法可用于图6或者图7所示的液晶显示屏架构中。下面以基于图6所示架构为例，对本申请实施例的液晶显示屏的背光功率控制方法进行说明。请参阅图8，图8是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图，该方法可包括：
801、LCD驱动IC获取所述LCD的LED脉冲宽度调制信号。
其中，该液晶显示屏中采用了插黑技术，因此输出至LED背光光源的LED信号是LED脉冲宽度调制信号，该脉冲宽度调制信号的脉冲宽度即在一帧的时长中背光开启的时长。
其中，PWM是对逆变电路开关器件的通断进行控制，使输出端得到一系列幅值相等的脉冲控制方式。若不改变幅值的情况下按一定的规则对PWM信号的各脉冲的宽度进行调制，即调整脉冲的占空比即可改变逆变电路输出电压的大小，当然脉冲宽度的调整也可以改变PWM信号的输出频率。
采用PWM技术进行LED调光的方式是通过周期性地开启和关闭LED来改变正向电流的导通时间来控制LED的亮暗时间；由于人眼感知的亮度是一个累积过程，即在一个周期内，LED亮的时间在整个周期中所占的比例越大，人眼会感觉越亮。如果LED亮暗的频率超过100Hz，那么人眼看到的就是平均亮度，而不是LED在闪烁，此时在幅值不变的情况下，对脉冲宽度进行调整时，增大脉冲宽度便会使得人眼感觉亮度增加，反之，则会感觉亮度减小。采用PWM调光的液晶显示屏的LED背光光源的工作频率一般在200Hz-1000Hz左右，由于PWM发光的本质是“亮-灭-亮-灭”的过程，相当于可见光在对人眼进行一定频率的闪烁冲击，当PWM频率越高，即闪烁的频率越高，对人眼对冲击的感知越弱；同时亮度越高，也可以减少人眼对这种闪烁式冲击的感知。
可见，PWM调光方式区别于通过改变LED的电流大小以改变LED亮度的线性调光方式，PWM调光只是使得LED不连续工作，从而可以在不改变电流大小的情况下便能改变LED亮度。
需要说明的是，对于LCD来说，由于刷新率的不同，一帧的时长也不尽相同，例如LCD的刷新率设为60hz，表示一秒钟重绘60次LCD上显示的图像，此时的一帧的时长则是1/60秒，同理，若LCD的刷新率为90hz，则表示一秒钟重绘90次LCD上显示的图像，此时一帧的时长则变为1/90秒。当然，对于VR领域来说，刷新率越高越好，低刷新率的情况下，如60hz看到的画面会出现明显的闪烁不稳定的情况，而这种情况加上场景随视角移动会出现眼部难受晕眩等症状。对于本申请实施例中的LCD来说，刷新率可以是超过90hz的LCD，能够有效降低上述症状。
802、LCD驱动IC采用CABC算法确定背光降低比例。
其中，该背光降低比例为LED脉冲宽度调制信号对应的待显示内容的背光的背光降低比例，该CABC技术能够根据待显示的内容实时调整背光降低比例，下面进行说明举例来说，请参阅图9，图9是采用CABC动态背光调节显示内容的示意图。其中，第一图像901为原始图片，第二图像903为内容分析后发现可以降低30％背光亮度，将灰阶的穿透率进 行相应的调整为原本的10/7；第一背光亮度902是原始的背光亮度，第二背光亮度903则是经过内容分析后，发现能将背光亮度调暗30％后的背光亮度，第三图像905即结合灰阶穿透率的调整为原本的10/7以及将背光亮度调整为第二背光亮度903时最终在液晶显示屏上显示的图像，第三图像905的显示效果与第一图像901的显示效果基本相同。
需要说明的是，30％功耗的降低对应灰阶调高30％是示意性的，30％功耗的降低并不一定对应该图片的灰阶调高30％，实际情况中会以该图像的实际内容来确定灰阶调高比例，同理，对于LED背光光源来说，功耗降低30％对应背光亮度调暗30％也是示意性的，而实际上功耗降低30％也不一定对应到背光亮度调暗30％，具体调暗的比例依LED背光光源的不同而不同。
803、LCD驱动IC根据背光降低比例调整LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个。
其中，在通过CABC技术获取了待显示内容的背光的背光降低比例后，便可以根据该比例调整LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个，并且，使得调整后的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的背光降低比例。即，若背光降低比例为70％，即背光降低为原背光的70％，此时，调整后的LED脉冲宽度调制信号的脉冲宽度与幅值乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积的70％。其中，脉冲宽度实际上背光点亮的时长，而幅值实际上是背光点亮时的电流值，即该乘积在物理上为电流与时间的乘积。
需要说明的是，该CABC调整的最小时长单位可以是一个帧的时长，而液晶显示屏获取的待发送的LED脉冲宽度调制信号则是包括连续至少一个帧的LED脉冲宽度调制信号。即相当于在一个LED脉冲宽度调制信号上的不同帧可以采用不同的CABC调整，从而达到根据待显示的内容实时调整背光降低比例的作用。
可选的，液晶显示屏内还设置与背光降低比例对应的预设的脉冲宽度和预设的幅值，该预设的脉冲宽度和预设的幅值有多种获取方式，如该预设的脉冲宽度和预设的幅值直接存储在LED驱动IC上，当然，也可以存储在LED驱动IC能够读取数据的存储器上，具体的方式并不作限定。该预设的脉冲宽度为所述待显示内容对应的LED脉冲宽度调制信号的脉冲宽度的背光降低比例；即，相当于仅调整脉冲宽度使得脉冲宽度与幅值的乘积达到背光降低比例；该预设的阈值为所述预设的幅值为所述待显示内容对应的LED脉冲宽度调制信号的幅值的背光降低比例，即，相当于仅调整幅值使得脉冲宽度与幅值的乘积达到背光降低比例。
在具有预设的脉冲宽度和预设的幅值的基础上，液晶显示屏根据所述背光降低比例调整LED脉冲宽度调制信号的幅值和/或脉冲宽度的方式可以有如下几类，下面分别进行说明。
第一类，仅对脉冲宽进行调整。此种方式中具有两类不同的情形，第一种情形是将脉冲宽度缩短。第二种是通过比LED脉冲宽度调制信号更高频有间距的至少两个子脉冲代替原本的一个脉冲。下面进行说明：
第一种，将脉冲宽度缩短。此时，步骤803可变为根据背光降低比例将LED脉冲宽度 调制信号的脉冲宽度缩短为预设的脉冲宽度。即，直接按照背光降低比例仅将脉冲宽度缩短为预设的脉冲宽度即可，而不调整幅值。具体可参见图10和图11，图10是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图，图11是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图，其中该图10和图11均表示两帧的时长的脉冲波形图，两图中均以背光降低比例为70％为例，横坐标为时间，纵坐标为电流；其中实线表示调整后的LED脉冲宽度调制信号，虚线则表示调整前的LED脉冲宽度调制信号；图10和图11的区别在于实际的调整方式略有不同，图10中是将脉冲的上升沿固定，将下降沿提前，从而达到脉冲宽度和幅值的乘积为调整前的脉冲宽度和幅值的乘积的70％；而图11中则将下降沿固定，而将上升沿滞后，同样能够实现脉冲宽度和幅值的乘积为调整前的脉冲宽度和幅值的乘积的70％。
第二种，通过比LED脉冲宽度调制信号更高频有间距的至少两个子脉冲代替原本的一个脉冲。步骤603可变为根据所述背光降低比例将所述LED脉冲宽度调制信号中的脉冲宽度调整为至少两个具有间隔的子脉冲宽度，并且所述至少两个子脉冲宽度的脉冲宽度之和为所述预设的脉冲宽度。相当于至少两个子脉冲的宽度的宽度之和为调整前的LED脉冲宽度调制信号的脉冲宽度的70％。具体可参见图12，图12是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图，其中该图12表示两帧的时长的脉冲波形图，图12中均以背光降低比例为70％为例，横坐标为时间，纵坐标为电流；图12下方为第一帧的脉冲的放大示意图，其中实线表示调整后的LED脉冲宽度调制信号，虚线则表示调整前的LED脉冲宽度调制信号；可以看出，通过将一个脉冲调整为多个幅值相同的子脉冲，这些子脉冲的间距并不限定，只要这些子脉冲的脉冲宽度之和达到调整前的LED脉冲宽度调制信号的脉冲宽度的70％即可，即可达到这些子脉冲的脉冲宽度和幅值的乘积并累加的结果为调整前的脉冲宽度和幅值的乘积的70％。
第二类，仅对幅值进行调整。此时，步骤603可变为根据背光降低比例将LED脉冲宽度调制信号的幅值减小为预设的幅值。即，直接按照背光降低比例将幅值减小为预设的幅值即可，而不调整脉冲宽度。具体可参见图13，图13是本申请实施例的液晶显示屏的背光功率控制方法的一个实施例图，其中该图13表示两帧的时长的脉冲波形图，图13中均以背光降低比例为70％为例，横坐标为时间，纵坐标为电流；其中实线表示调整后的LED脉冲宽度调制信号，虚线则表示调整前的LED脉冲宽度调制信号；可以看出，直接将幅值减小为70％，即可达到脉冲宽度和幅值的乘积为调整前的脉冲宽度和幅值的乘积的70％。
第三类，同时对脉冲宽度和幅值进行调整，将两种同时调整时，会有三种不同的情形，第一种是调整后的脉冲宽度大于预设的脉冲宽度且调整后的幅值大于预设的幅值。第二种是调整后的脉冲宽度小于预设的脉冲宽度且调整后的幅值相对调整前的幅值有增加。第三种是调整后的脉冲宽度相对于调整前的脉冲宽度有增加且调整后的幅值小于预设的幅值。
需要说明的是，从第一类和第二类中的各种情形可以发现，不论是调整前的还是调整后的脉冲宽度与幅值的乘积实际上表示脉冲的面积。调整前和调整后的面积的比例直接与背光降低比例相对应，例如，背光降低比例为70％，实际上是将调整前的LED脉冲宽度调制信号的一个脉冲的面积减小为原来的的70％。在此方式的基础上，可以从而该面积的两 个维度来调整，即脉冲宽度和幅值。因此，第三类情况中的三种情形中，第一种是在原本的基础上通过将脉冲宽度和幅值均调小的方式，使得面积满足为调整前的70％的需求，第二种则是在原本的基础上缩短脉冲宽度并增加幅值使得面积满足为调整前的70％的需求。第三种则是在原本的基础上增加脉冲宽度并减小幅值使得面积满足为调整前的70％的需求。
804、LCD驱动IC向LED驱动IC输出调整后的LED脉冲宽度调制信号。
可以理解的是，LED驱动IC在完成了LED脉冲宽度调制信号的调整后，会将该调整后的LED脉冲宽度调制信号发送给LED驱动IC，使得LED驱动IC驱动LED背光光源发光。
805、LED驱动IC根据调整后的LED脉冲宽度调制信号控制LED背光光源发光。
可以理解的是，LED驱动IC在接收到调整后的LED脉冲宽度调制信号后，会根据该调整后的LED脉冲宽度调制信号向LED背光光源按照调整后的LED脉冲宽度调制信号的脉冲进行供电，使得LED背光光源根据调整后的LED脉冲宽度调制信号发出背光。
806、LED背光光源根据调整后的LED脉冲宽度调制信号发出背光。
其中，在完成LED脉冲宽度调制信号的调整后，即可将该LED脉冲宽度调制信号发送至LED背光光源，由LED背光光源根据该调整后LED脉冲宽度调制信号发出背光，从而使得LCD显示出的待显示内容与根据调整前的LED脉冲宽度调制信号发出背光显示出的待显示内容的效果基本一致，即图像显示质量的损失在预设的可接受的范围内。
此外，需要说明的是，图8所示实施例是采用本申请实施例的背光功率控制方法的液晶显示屏的一种实现方式，本申请实施例的液晶显示屏中，除了采用图6或者图7所示的液晶显示屏架构，LCD驱动IC通过CABC算法确定背光降低比例，并对LED脉冲宽度调制信号进行调整之外，还可以单独设计一块调整IC，请参阅图10，图10所示是本申请实施例的IC连接示意图，其中，该调整IC位于LCD驱动IC与LED驱动IC之间，在液晶显示屏工作时，首先由LCD驱动IC产生LED脉冲宽度调制信号，调整IC接收到该LED脉冲宽度调制信号的同时，会通过CABC算法确定背光降低比例，然后对该LED脉冲宽度调制信号的脉冲宽度和幅值进行调整，得到调整后的LED脉冲宽度调制信号，再将其发送到LED驱动IC。
需要说明的是，该调整IC可以是专门为CABC算法以及调整LED脉冲宽度调制信号设计的芯片，也可以是另一个LCD驱动IC，该LCD驱动IC能接收前一个LCD驱动IC发出的LED脉冲宽度调制信号。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。
所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例 如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案和范围。

Claims (16)

  1. 一种液晶显示屏的背光功率控制方法，其特征在于，包括：
    液晶显示屏LCD获取所述LCD的发光二极管LED脉冲宽度调制信号；
    所述LCD采用内容对应背光控制CABC算法确定背光降低比例，所述背光降低比例为所述LED脉冲宽度调制信号对应的待显示内容的背光的背光降低比例；
    所述LCD根据所述背光降低比例调整所述LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个，其中，调整后的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的所述背光降低比例；
    所述LCD内的LED背光光源根据调整后的LED脉冲宽度调制信号发出背光。
  2. 根据权利要求1所述的液晶显示屏的背光功率控制方法，其特征在于，所述LCD根据所述背光降低比例调整所述LED脉冲宽度调制信号的幅值或脉冲宽度中的至少一个之前，所述方法还包括：
    所述LCD获取预设的脉冲宽度和预设的幅值，所述预设的脉冲宽度和预设的幅值对应所述背光降低比例；其中，所述预设的脉冲宽度为所述待显示内容对应的LED脉冲宽度调制信号的脉冲宽度的背光降低比例；所述预设的幅值为所述待显示内容对应的LED脉冲宽度调制信号的幅值的背光降低比例。
  3. 根据权利要求2所述的液晶显示屏的背光功率控制方法，其特征在于，所述根据所述背光降低比例调整所述LED脉冲宽度调制信号的脉冲宽度或幅值包括：
    根据所述背光降低比例将所述LED脉冲宽度调制信号的脉冲宽度缩短为预设的脉冲宽度；或，
    根据所述背光降低比例将所述LED脉冲宽度调制信号的幅值减小为预设的幅值。
  4. 根据权利要求3所述的液晶显示屏的背光功率控制方法，其特征在于，根据所述背光降低比例将所述LED脉冲宽度调制信号的脉冲宽度缩短为预设的脉冲宽度包括：
    根据所述背光降低比例将所述LED脉冲宽度调制信号中的脉冲宽度调整为至少两个具有间隔的子脉冲宽度，所述至少两个子脉冲宽度的脉冲宽度之和为所述预设的脉冲宽度。
  5. 根据权利要求2所述的液晶显示屏的背光功率控制方法，其特征在于，所述根据所述背光降低比例调整所述LED脉冲宽度调制信号的脉冲宽度和幅值包括：
    根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉冲宽度至大于所述预设的脉冲宽度，并减小所述LED脉冲宽度调制信号的幅值至大于所述预设的幅值。
  6. 根据权利要求2所述的液晶显示屏的背光功率控制方法，其特征在于，所述根据所述背光降低比例调整所述LED脉冲宽度调制信号的脉冲宽度和幅值包括：
    根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉宽至小于所述预设的脉冲宽度，并增加所述LED脉冲宽度调制信号的幅值。
  7. 根据权利要求2所述的液晶显示屏的背光功率控制方法，其特征在于，所述根据所述背光降低比例调整所述LED脉冲宽度调制信号的脉冲宽度和幅值包括：
    根据所述背光降低比例减小所述LED脉冲宽度调制信号的幅值值小于所述预设的幅值，并增加所述LED脉冲宽度调制信号的脉冲宽度。
  8. 一种液晶显示屏，其特征在于，包括液晶显示屏LCD面板，与所述LCD面板电连接的用于驱动所述LCD面板的LCD驱动集成电路IC，所述LCD面板的背面还设有发光二极管LED背光光源，所述LED背光光源上还连接有驱动所述LED背光光源的LED驱动IC，所述LCD驱动IC还与所述LED驱动IC相连接，其中，
    所述LCD驱动IC用于获取所述LCD的LED脉冲宽度调制信号；
    所述LCD驱动IC还用于采用内容对应背光控制CABC算法确定背光降低比例，所述背光降低比例为所述LED脉冲宽度调制信号对应的待显示内容的背光的背光降低比例；
    所述LCD驱动IC还用于根据所述背光降低比例调整所述LED脉冲宽度调制信号的幅值或脉冲宽度之中的至少一个，其中，调整后的LED脉冲宽度调制信号的脉冲宽度与幅值的乘积为调整前的LED脉冲宽度调制信号的脉冲宽度与幅值乘积的所述背光降低比例；
    所述LED驱动IC用于根据调整后的LED脉冲宽度调制信号驱动所述LED背光光源发出背光；
    所述LCD面板用于显示待显示内容。
  9. 根据权利要求8所述的液晶显示屏，其特征在于，所述LCD驱动IC还用于：
    获取预设的脉冲宽度和预设的幅值，所述预设的脉冲宽度和预设的幅值对应所述待显示内容的背光降低比例；其中，所述预设的脉冲宽度为所述待显示内容对应的LED脉冲宽度调制信号的脉冲宽度的背光降低比例；所述预设的幅值为所述待显示内容对应的LED脉冲宽度调制信号的幅值的背光降低比例。
  10. 根据权利要求9所述的液晶显示屏，其特征在于，所述LCD驱动IC具体用于：
    根据所述背光降低比例将所述LED脉冲宽度调制信号的脉冲宽度缩短为预设的脉冲宽度；或，
    根据所述背光降低比例将所述LED脉冲宽度调制信号的幅值减小为预设的幅值。
  11. 根据权利要求10所述的液晶显示屏，其特征在于，所述LCD驱动IC具体用于：
    根据所述背光降低比例将所述LED脉冲宽度调制信号中的脉冲宽度调整为至少两个具有间隔的子脉冲宽度，所述至少两个子脉冲宽度的脉冲宽度之和为所述预设的脉冲宽度。
  12. 根据权利要求9所述的液晶显示屏，其特征在于，所述LCD驱动IC具体用于：
    根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉冲宽度至大于所述预设的脉冲宽度，并减小所述LED脉冲宽度调制信号的幅值至大于所述预设的幅值。
  13. 根据权利要求9所述的液晶显示屏，其特征在于，所述LCD驱动IC具体用于：
    根据所述背光降低比例缩短所述LED脉冲宽度调制信号的脉宽至小于所述预设的脉冲宽度，并增加所述LED脉冲宽度调制信号的幅值。
  14. 根据权利要求9所述的液晶显示屏，其特征在于，所述LCD驱动IC具体用于：
    根据所述背光降低比例减小所述LED脉冲宽度调制信号的幅值值小于所述预设的幅值，并增加所述LED脉冲宽度调制信号的脉冲宽度。
  15. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1-7任意一项所述的方法。
  16. 一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如权 利要求1-7任意一项所述的方法。
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