CN107527593B - High-light-efficiency TFT-LCD backlight display driving method - Google Patents
High-light-efficiency TFT-LCD backlight display driving method Download PDFInfo
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- CN107527593B CN107527593B CN201710719697.1A CN201710719697A CN107527593B CN 107527593 B CN107527593 B CN 107527593B CN 201710719697 A CN201710719697 A CN 201710719697A CN 107527593 B CN107527593 B CN 107527593B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a high-light-efficiency TFT-LCD backlight display driving method, which improves the light efficiency of the TFT-LCD, avoids the method of improving the effective power by the traditional method in the application of high color gamut, low brightness and high contrast, improves the light efficiency, achieves the purpose of energy saving, and improves the light efficiency by more than 25 percent compared with the traditional method. The method comprises the following steps: a. the fluorescent powder in the LED lamp is matched with the green fluorescent powder by adopting the red fluorescent powder with afterglow performance, and the fluorescence life of the fluorescent powder meets the afterglow duration when the highest brightness reaches 1/e; b. driving the LED lamp by adopting a PWM method; wherein, the sum of the time for driving the LED lamp by adopting a PWM method and the fluorescence life of the red fluorescent powder or the green fluorescent powder with afterglow performance is more than or equal to the maintenance time of continuous lighting and darkness of each pixel point on the TFT-LCD display screen; meanwhile, in a passive state, the duty cycle time of the PWM method is less than or equal to the shortest fluorescence lifetime of the red fluorescent powder or the green fluorescent powder.
Description
Technical Field
The invention belongs to the field of semiconductor illumination, and particularly relates to a high-light-efficiency TFT-LCD backlight display driving method.
Background
Optoelectronic technology is one of the core technologies of the information industry, is a high-new technology which is rapidly developed after microelectronic technology, and has strong vitality. As energy crisis and climate warming become more and more serious, energy conservation has become a global concern, and people seek new energy conservation ways through various approaches.
Compared with the traditional light source, the LED light source has the following advantages: the service life is prolonged to tens of thousands of hours, and the traditional light source is generally thousands of hours; the structure is firm, no tungsten filament, glass bulb and other parts which are easy to damage are provided, and the anti-seismic performance is extremely high; the response speed is high, and the light flux rising time is short; the demand on the point lamp circuit is low, and the dimming and intelligent control are easy to realize; the switch impact resistance is suitable for frequent switch occasions; the LED lamp has high efficiency and energy conservation, the existing light efficiency exceeds that of an incandescent lamp, and the theoretical light efficiency can reach 200lm/W; does not contain harmful substances such as mercury, lead and the like, has no pollution and is environment-friendly.
The television and the electronic picture display are indispensable necessities in life of people, the aim of energy conservation and consumption reduction is not changed along with the continuous updating of technology, the LED appears, the opportunity is brought to the innovation of the technological progress of the display industry, and in a short time, the LED is used as a backlight source technology to replace other technologies on the liquid crystal television, the mobile phone and other display devices rapidly, so that the display is the main stream of the market.
In recent years, various flat panel display technologies have been rapidly developed, and people have entered the era of flat panel display. At present, the TFT-LCD technology has been developed and mature, and is the main stream of flat panel display equipment. In order to maintain the original light and thin characteristics of the lcd, the design of the backlight module is important. The improvement of brightness and luminous efficiency of LCD panels, the improvement of black-and-white contrast ratio and more color reduction degree of display pictures are the technological advancement demands of liquid crystal display, and besides the continuous improvement of the characteristics of LCDs, the backlight light source efficiency is also the most important factor. Improving the utilization efficiency of the LEDs and enhancing the white color richness of the backlight is a problem which the LEDs must solve.
However, in the current high-color-gamut display, a fluorescent material with a narrower half-wave width, including fluorescent powder or quantum dot powder, is a main method for solving color reduction, i.e. improving the color gamut level, and the luminous efficiency of the system at the moment is obviously reduced, which is contradictory to the high dynamic contrast-HDR characteristics that need to be improved for high-performance display, and the current problem is solved by adopting dynamic high-current driving generally, so that the caused reaction is to rapidly improve the driving power and reduce the service life of the LED.
Disclosure of Invention
The invention aims to provide a TFT-LCD backlight display driving method with high light efficiency, which improves the light efficiency of the TFT-LCD, avoids the method of improving the effective power by the traditional method in the application of high color gamut, low brightness and high contrast, improves the light efficiency, achieves the purpose of saving energy, and improves the light efficiency by more than 25 percent compared with the traditional method.
In order to achieve the above purpose, the specific technical scheme of the invention is as follows:
a high light efficiency TFT-LCD backlight display driving method comprises the following steps:
a. the fluorescent powder in the LED lamp is matched with the green fluorescent powder by adopting the red fluorescent powder with afterglow performance, and the fluorescence life of the fluorescent powder meets the afterglow duration when the highest brightness reaches 1/e;
b. driving the LED lamp by adopting a PWM method;
wherein, the sum of the time for driving the LED lamp by adopting a PWM method and the fluorescence life of the red fluorescent powder or the green fluorescent powder with afterglow performance is more than or equal to the maintenance time of continuous lighting and darkness of each pixel point on the TFT-LCD display screen; meanwhile, in a passive state, the duty cycle time of the PWM method is less than or equal to the shortest fluorescence lifetime of the red fluorescent powder or the green fluorescent powder.
Further, in the step a, the green fluorescent powder is nitrogen oxide and aluminosilicate co-doped with Dy, the activator is mainly Eu, and the green wavelength generated by the green fluorescent powder is 520-540nm.
Further, the main component of the green fluorescent powder is ZnSiO3: mn, as, srMgSiO7, eu, dy, caMgSiO7, eu, dy, mgSiO3, mn, eu, dy.
Further, the fluorescence lifetime of the green fluorescent powder is 7-9ms, which is consistent with KSF (K2 SiF6: mn4+) or KGF (K2 GeF6: mn4+).
Further, in the step b, when the PWM pulse driving frequency is 60Hz, the sustain time of the on-state and the off-state of each pixel is 16.67ms, the pulse width of the PWM pulse driving is 9.17ms, and the duty ratio thereof is 55%.
Further, while reducing the duty cycle, the pulsed drive current of the LED lamp can be increased proportionally, which can be doubled at maximum.
According to the invention, according to the research on the display driving principles of fluorescent powder and TFT-LCD, the latest system design scheme is provided, including a power supply driving mode and a corresponding manufacturing mode of LEDs, so that the performance originally wasted on the system design is fully exerted as far as possible on the basis of ensuring not to raise the power consumption, the high brightness and high contrast of the display requirements are achieved, the system power consumption is not raised, the service life of the LEDs is ensured, and finally the purposes of energy conservation and consumption reduction are achieved.
Drawings
FIG. 1 is a schematic diagram of the voltage equivalent of TFT-controlled pixel liquid crystal molecules;
FIG. 2a is a schematic diagram showing a state of the LCD after the first line of pixels is scanned;
FIG. 2b is a schematic diagram of the second line scan in FIG. 2a after the second line scan is started;
FIG. 3 is a graph of fluorescence lifetime of a typical red powder of fluoride;
FIG. 4 is a graph of fluorescence lifetime of green phosphor;
fig. 5 is a pulse driving waveform diagram.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
The popularization of HDR (high dynamic range) in liquid crystal display has put higher demands on the highest off-screen brightness. For example, UHD requires a TV up to 1000nit off-screen brightness, which requires the LED backlight to boost brightness without greatly increasing power. The technical development of the LED chip tends to be mature, and the improvement of the quantum efficiency and the light extraction efficiency of the LED chip is difficult to realize the great improvement of lumens per watt in a short period.
According to the research on the display driving principle of fluorescent powder and TFT-LCD, the invention provides the latest system design scheme for improving the highest screen brightness, which comprises a power supply driving mode for carrying out pulse driving on LEDs by adopting a PWM modulation method and a corresponding manufacturing mode of the LEDs, so that the performance originally wasted on the system design is fully exerted as far as possible on the basis of ensuring not to improve the power consumption, the high brightness and the high contrast of the display requirements are achieved without improving the system power consumption, the service life of the LEDs is ensured, and finally the purposes of energy conservation and consumption reduction are achieved.
The design of the latest efficient combination scheme of the high-color-gamut fluoride fluorescent powder based on the standard 60Hz is extended to the latest method of driving the fluorescent life of corresponding different fluorescent powder at different frequencies. The pulse driving waveform may be a unidirectional pulse such as square wave, rectangular wave, triangular wave, sawtooth wave, etc., as shown in fig. 5.
According to the scanning frequency of the TFT-LCD, the method is designed on the basis of 60Hz which is the minimum requirement of 4K and 8K for high-end display, the minimum refreshing time of one frame of image is 16.67ms, and the turning time of liquid crystal molecules and the response time of the charging Cs storage capacitor of the unit pixel of the TFT are 21 us. Because each pixel switch of the LCD is not refreshed and changed in the same time, the light source needs to be continuously present within 100% of the time so as not to reduce the display performance.
The 9ms backlight source is powered on, and when the remaining 7-8ms active light is needed, the fluorescent life of the fluorescent powder is utilized to supplement the light source which penetrates through the liquid crystal, so that the continuous uninterrupted light source exists within 100% of the time.
The specific method comprises the following steps:
a TFT-LCD backlight display driving method with high light efficiency comprises the following steps:
a. the fluorescent powder in the LED lamp is matched with the green fluorescent powder by adopting the red fluorescent powder with afterglow performance, and the fluorescence life of the fluorescent powder meets the afterglow duration when the highest brightness reaches 1/e;
b. driving the LED lamp by adopting a PWM method;
wherein, the sum of the time for driving the LED lamp by adopting a PWM method and the fluorescence life of the red fluorescent powder or the green fluorescent powder with afterglow performance is more than or equal to the maintenance time of continuous lighting and darkness of each pixel point on the TFT-LCD display screen; meanwhile, in a passive state, the duty cycle time of the PWM method is less than or equal to the shortest fluorescence lifetime of the red fluorescent powder or the green fluorescent powder.
And the PWM modulation method is adopted to pulse-drive the LEDs, if the original design current is not changed, the power consumption can be directly reduced according to the driving duty ratio, but the brightness of the LEDs is not correspondingly reduced. Further, the pulse driving current of the LED may be proportionally increased while the duty ratio is reduced, and the brightness of the LED may be increased without increasing the power consumption. The second problem to be solved is to design the duty cycle to match the fluorescence lifetime of the fluorescent powder for the most reasonable and generalized definition. For example, 60Hz driving is adopted, the duty ratio is 55% which is a driving design capable of playing the best efficiency, and meanwhile, the pulse current is adjusted to be increased by 30% -45%, so that the equivalent power consumption of a blue light chip is met, the brightness of an LED is increased when the pulse current is high, and the HDR basic requirement from 600nit to 1000nit is realized.
The extended technical design scheme can be popularized to common color gamut and higher color gamut display, and can be driven by pulse PWM modulation of more than 120Hz on the application without using fluorescent powder of about 8ms, and the common fluorescent powder with the fluorescence lifetime of less than 1us is used, so that the effect of highlighting and high light efficiency which are required to be solved equally can be realized by utilizing the persistence of vision phenomenon of human eyes.
Under the requirements of high color gamut, high brightness and high contrast, fluoride application is the most efficient solution at present, design by utilizing the autofluorescence life of Mn element is the latest requirement for fluoride fluorescent powder application with patent appeal, and the fluorescence life is the defect of popularization and use of fluoride in traditional application, and the patent appeal is to fully utilize the characteristics of fluoride and is not limited to all fluorescent powder containing Mn element of fluoride.
For the newly proposed fluorescent powder design taking the fluorescence life as a basic parameter, the red powder and the green powder can be combined to achieve synchronous white light, so that the white light consistent with the original active drive can be naturally matched by utilizing the life of fluorescence in the pulse driving process. ZnSiO3 was used here: the design of Mn, as, srMgSiO7, eu, dy, caMgSiO7, eu, dy, mgSiO3, mn, eu, dy and other green powders can achieve the design of fluorescence lifetime, and the fluorescence lifetime which is nearly consistent with fluoride KSF (K2 SiF6: mn4+) or KGF (K2 GeF6: mn4+) can be obtained by adjusting the proportion of each element for the molecular formula.
Because the liquid crystal cannot emit light, an LED backlight light source with sufficient brightness and uniform distribution is required to be supplied, and the output quantity of the light source is controlled by the deflection of the liquid crystal, so that the function of displaying is achieved. In a place which is obviously different from the CRT display, although the line scanning mode is adopted, the liquid crystal is different in that the pixel point after scanning is always kept in a lighting state until the next scanning signal changes according to the requirement, and the cathode ray irradiates fluorescent powder by electron beam bombardment, namely when the electron beam scanning process leaves a certain pixel, no matter whether the pixel needs to irradiate or not, the fluorescent powder can not emit light again when the next scanning electron beam comes, so that the CRT display has a stroboscopic phenomenon, a common CRT television obviously senses stroboscopic phenomenon when the refreshing frequency is 60Hz, but if the stroboscopic phenomenon is more than 100Hz, the stroboscopic phenomenon is obviously improved.
As shown in fig. 1, the liquid crystal scanning process charges the capacitance of each pixel, and the value of the charging capacitance is temporarily changed during the second frame scanning. In this process, as shown in fig. 2a and 2b, the backlight needs to be continuously lighted so as not to lose its brightness. Therefore, the backlight light source is driven by pulses to improve the utilization efficiency, so that the brightness of the pixel point is not bright at a certain time sequence, and the strobe is caused.
The TFT-LCD takes a 4K panel as an example, the refresh frequency is only 60Hz at the highest, namely the continuous bright and dark state maintaining time of each pixel point is 16.67ms, and the light transmission requirement exists in any time due to the point-by-point time sequence scanning.
The invention uses 60Hz driving mode, and in the LED manufacturing process, the red fluorescent powder with afterglow performance such as fluoride is used in combination with the design afterglow of newly developed green fluorescence, the LED is driven by adopting a Pulse Width Modulation (PWM) method, the LED is driven by 55% duty ratio direct current, the pulse current of the LED in the modulation process is improved by about 45%, the driving pulse width is 9.17ms, the light supplementing design is carried out by using the fluorescent lifetime of the fluorescent powder about 8ms, the light is always transmitted in the 16.67ms interval of the lighting of the whole liquid crystal pixel, thereby the afterglow tail of the high-color-gamut fluoride fluorescent powder in practical application is counteracted, and the defects of the fluorescent powder are converted into a method for improving efficiency and brightness, as shown in figure 3, the graph of typical red fluorescent lifetime KSF-8ms and KGF-7ms is shown.
And the pulse lighting 9.17ms and the fluorescence lifetime 8ms are larger than the 60Hz TFT scanning frequency, so that the missing process of brightness cannot be felt, and the picture quality is not affected. The same principle is adopted when the refresh frequency is 30Hz, and the same driving scheme is adopted, so that the perfect coverage can be realized when the refresh process is lighted twice each time.
Of course, only red phosphor is insufficient to realize the scheme, and green phosphor with matched 6-10ms fluorescence life is necessary to ensure the normal white requirement of the red phosphor in the passive process, so that green phosphor meeting the high color gamut requirement needs to be synchronously developed for matching. However, currently, high-color-gamut green phosphors, such as silicate, B-SiAlON, and other phosphors with smaller half-wave widths, are commercially available for use in backlight systems, and the current fluorescence lifetime is about 1 us. None match the application.
The invention designs and uses nitrogen oxides and aluminosilicate of codoped Dy, the activator is mainly Eu, the proportion of Ca, mg, al, si, O, N is properly regulated to generate green light between 520 nm and 540nm, the fluorescence lifetime is designed to be basically consistent with KSF (K2 SiF6: mn4+) or KGF (K2 GeF6: mn4+), the white light matching after the optical passive of white light is realized, as shown in figure 4, the fluorescence lifetime attenuation curve of green fluorescent powder is shown, the ordinate is the light energy density, and the abscissa is the time.
The invention uses the ultra-short response time of the blue light chip and the fluorescent powder to carry out PWM modulation driving design, and designs the stroboscopic brightness lack and the color variation which appear after modulation. The light efficiency of the TFT-LCD is improved, the method for improving the effective power by the traditional method is avoided in the application of high color gamut, low brightness and high contrast, the light efficiency is improved, the energy-saving purpose is achieved, and compared with the traditional method, the light efficiency is improved by more than 25%.
Although several embodiments of the present invention have been described above, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the present invention, and are also included in the invention described in the claims and their equivalents.
Claims (4)
1. The TFT-LCD backlight display driving method with high light efficiency is characterized by comprising the following steps:
a. the fluorescent powder in the LED lamp is matched with the green fluorescent powder by adopting the red fluorescent powder with afterglow performance, and the fluorescence life of the fluorescent powder meets the afterglow duration when the highest brightness reaches 1/e;
b. driving the LED lamp by adopting a PWM method;
wherein, the sum of the time for driving the LED lamp by adopting a PWM method and the fluorescence life of the red fluorescent powder or the green fluorescent powder with afterglow performance is more than or equal to the maintenance time of continuous lighting and darkness of each pixel point on the TFT-LCD display screen; meanwhile, in a passive state, the duty cycle time of the PWM method is less than or equal to the shortest fluorescence lifetime of the red fluorescent powder or the green fluorescent powder;
in the step a, the green fluorescent powder is nitrogen oxide and aluminosilicate co-doped with Dy, an activator of the green fluorescent powder is Eu, and the wavelength of green light generated by the green fluorescent powder is 520-540nm;
the fluorescence lifetime of the green fluorescent powder is consistent with that of K2SiF6:Mn4+ or K2GeF6:Mn4+, and is 7-9ms.
2. The method for driving a TFT-LCD backlight display with high light efficiency according to claim 1, wherein the green phosphor comprises ZnSiO3: mn, as, srMgSiO7, eu, dy, caMgSiO7, eu, dy, mgSiO3, mn, eu, dy.
3. The method according to claim 1, wherein in the step b, when the PWM pulse driving frequency is 60Hz, the sustain time of the light-dark state of each pixel is 16.67ms, the pulse width of the PWM pulse driving is 9.17ms, and the duty ratio is 55%.
4. A TFT-LCD backlight display driving method with high light efficiency as claimed in claim 3, wherein said duty cycle is reduced while the pulse driving current of said LED lamp is proportionally increased, said pulse driving current being doubled at maximum.
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