TWI292895B - Dynamic driving method and apparatus using thereof - Google Patents

Description

Nine, invention description: [Technical field to which the invention belongs]

The present invention relates to a driving device for a display, and more particularly to a dynamic driving method for a liquid crystal display and an apparatus using the same. [Prior Art]

In order to cope with the modern lifestyle, the size of video or video devices is becoming thinner and lighter. Conventional cathode ray displays (CRTs), although still have their advantages, due to the structure of the internal electron cavity, the display is bulky and takes up space, and has radiation defects such as display. Therefore, flat panel displays (FpD) developed with optoelectronic technology and semi-body manufacturing technology, such as liquid helium display (LCD), organic light emitting display (〇LED) or plasma display; 曰 (PDP), has gradually become a display The mainstream of the product. : domain day I, (10) 5 1 soil * by - liquid crystal display panel and a pound of "the" liquid crystal display panel consists of two transparent substrates and

The liquid crystal layer is formed, and the backlight module is used for the surface light source of the == display, so that the liquid crystal display is arranged by the liquid crystal display (Twisted Nematic, TN i

Aliment, ^ f « For the liquid crystal type, the crystal is arranged in a row, and the display is inferior, as shown in Figure 1A, and Figure = Transmittance·Voltage 1292895 15519twf.doc/g Figure rf 16 is shown as TM Τ-v mountain curve with VA Weijing display. Referring to FIG. 1A, when the voltage of the s terminal of the liquid crystal molecules applied to the liquid crystal layer is getting larger and larger, the transmittance of the liquid crystal display panel becomes lower and lower due to the twist of the liquid crystal molecules, wherein the transmittance is only % of the liquid crystal. Displayed in the brightest state, the transmittance of 0% means that the liquid crystal is displayed in the darkest state. Please refer to FIG. 1B' opposite to the TN type liquid crystal display, va type liquid crystal display

When the display is applied to the ends of the liquid crystal molecules, the transmittance of the liquid crystal display panel becomes higher and higher.

In addition, in order to speed up the reaction speed of the liquid crystal display (resp〇nse t·) 'Resolve the generation of afterimages when the fast playback is performed on the display, so the development of the overdrive (GV_ive) square wire (four) liquid crystal monitor. For example, 'the original application of liquid crystal molecules 4 volts (v) to rotate it to the corresponding rotation angle requires _ 2G milliseconds (four) to complete, which is a fast reaction speed, so the liquid crystal molecules are applied with a larger voltage such as 6 v, so that The angle 扪 is rotated within a short period of time, such as 15 ms. At this time, in the time of 15 ms, although the liquid crystal molecules cannot be rotated to the voltage 6 ν rotation angle Θ 2 (10) &gt; θ1), the rotation angle Θ 1 corresponding to the pressure of 4 V can be rotated within the time ls ms. i 曰 However, even if the overload drive method is adopted, it is limited by the maximum reaction speed (rmin) of the night crystal material itself, so that the reaction speed of the liquid crystal display still has its limit. As shown in Fig. 2, the curve 201 is an overload drive. The reaction time of the liquid crystal display under different gray levels. Unless a liquid crystal material having a rapid reaction such as an optically compensated birefringent (〇CB) liquid crystal is used, it will increase substantially.曰 6, 1292895 l55l9twf.doc/g SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a dynamic driving method suitable for use in a display device such as a liquid crystal display. This dynamic driving method can make the reaction speed of the display device exceed the maximum reaction speed of the liquid crystal material without changing the liquid crystal material. It is still another object of the present invention to provide an apparatus using the above dynamic driving method. The device can make the reaction speed of the display device faster than the maximum reaction speed of the liquid crystal material without changing the liquid crystal material. The present invention provides a dynamic driving method suitable for a 'display device. The display device includes a display panel and a backlight module. The method includes: =Different-frequency receiving facial data. During the first period, the backlight module is turned off and the backlight module is not displayed, and the display panel is driven to accelerate according to the information to be displayed, and the police body is under the pressure of the body. . Then, in the second period, the backlight module displays the screen, and drives the display panel according to the surface data voltage to be displayed. Among them, the reciprocal of the sum of the four periods in the second period of the first period is greater than the first frequency. However, it is also possible to set the (5) reciprocal of the sum of the two times as the first-frequency two-in-one double-face update rate. In addition, the ratio of 此: i / 曰 ^ ^ 可视 , i i i i i , , , , , , , , , , , i i i i i i i i i i i i i i i i i i i i i i i The second voltage, the voltage is dynamically adjusted, and the voltage of the T-di is the maximum of the above-mentioned normal driving voltage of the mosquito according to the characteristics of the tn 7 12.92895 15519 twf.doc/g display: ::? The end of the electric power is gradually increased (VA) type ^ driving voltage when the rotation is full. When the display device is vertically arranged, the thunder is touched by the chest, and the liquid crystal of the liquid crystal display is the two '曰, the temple, the reaction speed is the most Quickly start the slower threshold voltage, the operation is based on the best characteristics determined by the characteristics of the VA type liquid crystal display - the kind of dynamic device, the display device, the display device includes a display panel and a backlight module, The dynamic driving farmer =, the tribute driver dynamic voltage switcher and the timing controller. The lu, lean = driver is coupled to the display panel to drive the display panel. Dynamic ^ ^ knife change = receiving normal driving voltage and dynamically adjusting voltage, Root The control signal provided by the time control determines the output of the normal crane voltage, and the voltage of both, to the data driver. The command of the sequence 4 receives the data at the first frequency and turns off the moonlight module in the first phase. And according to the picture data to dynamically adjust the voltage translucent material to drive the Jay drive display panel. Then, the timing controller in the second, class, M cl,,, start the moonlight module, and according to the kneading data to the normal drive voltage ηtil driver The display panel is driven, wherein the reciprocal of the sum of the first period and the second period is greater than the first frequency, so the operating frequencies of the backlight module, the state, and the timing controller are higher than the first frequency, for example, twice. 1292895 r 15519twf.doc/g According to a preferred embodiment of the present invention, the moving bear device is a twisted nematic (TN) type liquid crystal device, which is larger than the first voltage and is determined by the second The maximum value of the normal driving voltage, and the liquid crystal end of the 曰r rii liquid crystal display gradually increases, the liquid turns to the saturation voltage of ϊβ!. When the display device is vertically aligned, the liquid 曰曰 is not displayed (4) , job _ whole The first voltage is the liquid crystal display at both ends of the crystal display: '曰, 才 /, the reaction speed is changed from the fastest to the critical electric 'pressure, and the fourth | waste is determined according to the characteristics of the VA type liquid crystal display. The above dynamic method and apparatus of the present invention first accelerates the rotation of liquid crystal molecules by appropriately selecting a voltage during the first period in which the back surface is not displayed (because the backlight module is turned off), and then can display the surface of the liquid crystal. During the second period (because the backing wire group is activated), the liquid crystal molecules are driven at a normal driving voltage, so that the reaction speed of the display device can exceed the maximum reaction speed of the liquid crystal material without changing the liquid crystal material. The above and other objects, features and advantages of the present invention will become more <RTIgt; [Embodiment] Fig. 3 is a block diagram showing a dynamic driving device according to a preferred embodiment of the present invention. Referring to Figure 3, system 310 controls display device 330 by dynamic drive unit 32. System 310 includes a VGA die 311. Dynamic Drive 1292895 15519twf.doc/g The mobile device 32A includes a signal converter% dynamic voltage switcher sequence controller, 325, and a data driver 329. The display device 33 includes a panel 331 and a backlight module 337. The backlight module 337 further includes an inverter 333 and a backlight 335, and the inverter is used to generate a source to drive the backlight 335 to illuminate. Here, the display device 33 is exemplified by a TN type liquid crystal display. Wherein, the dynamic voltage switch 322 accepts the power supply (the two voltages input by the non-green input 'including the first voltage Vdestn and the dynamic adjustment voltage will be described later how to determine the two secrets), and according to the timing control 1 is 325 The control signal is input to control the switch. For example, when the control signal is low, the switch 324 switches to the end point and then moves: the converter 322 outputs the dynamic adjustment electric grinder v to the data drive ^=the control signal is logic high, the switch seems to switch to the end At point p2, the voltage switch 322 outputs the first-voltage source driver "329". The first 'VGA chip 311 converts the view-to-desicue signal converter &amp; amp to be displayed on the display panel 331 into a mode that can be processed by subsequent elements. The timing controller 325 calls the image converter to contain image data containing a plurality of frame data. Let's take a look at the timing diagram shown in Figure 4 and Figure 3. The timing system is 325. During the first period, the backlight is turned off by the inverter state, and the backlight 335 is turned off, and the group 33 is turned off (as shown in FIG. *, and the output-control signal (the level is, for example, Logic low) gives the dynamic voltage cut to 322, so that the dynamic voltage switch 322 outputs a dynamic adjustment at this time, 1292895 15519 twf.doc / g voltage VDYN to the lean driver 329. The data driver 329 regards the dynamic adjustment voltage VDYN as Gamma The maximum voltage value of the voltage-dividing resistor string (not shown) is divided to be divided, and then the data driver 329 sends the divided gray-scale voltages to the display panel 331 to drive. Thus, the backlight module 330 is turned off. When the display panel 331 is unable to display the surface, the screen data to be displayed is accelerated by the dynamic adjustment voltage. Next, the timing controller 325 activates the backlight 335 through the inverter 333 during the second period T2, that is, the backlight module is activated. 33〇 (BLU_ON as shown in Figure *), and output a control signal (the level of which is, for example, logic 2) to the dynamic double switch ϋ 322, so that the dynamic voltage switcher at this time you play the first voltage Vdes— Tn to data drive The data driver 329 f the seventh voltage Vdes-tn is regarded as the voltage value of the Gamma voltage dividing resistor string (not shown) for voltage division, and then the data driver 329 will divide and output the gray scale voltage to The display panel 331 is driven. In this way, the surface data to be displayed is accelerated in the first period T1, and the period T2 only needs to use the general driving method to display the dry material to be displayed through the display panel 331. In the preferred embodiment of February, the sum of the first period T1 and the second period 1/ί2 is the reciprocal of the double-faced update rate (ie, 2*FR), that is, the so-called 昼The update rate is 1^, that is, the display panel 331 has a gold surface per second. The number is generally 6 Hz, that is, 60 sheets per second, and the update rate is 60 Hz, and the dynamic drive of the present invention is driven by the north. The timing controller 325, the data driver 329, and the display moonlight module 337 operate at a frequency of 12 Hz, because 1292895 * 15519 twf.doc/g must be used to accelerate the screen. The first display frequency is high, and Only, the double frequency 'as long as the original visual needs to be adjusted, not 1 is the shell of i (dutyrati0) Μ V shirt first-voltage-state adjustment ΐΓΐ2 Figure 1A shows the TV of the TM type liquid crystal display = partial enlargement. Figure 5B is the subtraction (four) 5 reaction time curve, where the reaction time is before The second is the black 昼 surface showing the value measured as the initial condition. Please refer to FIG. 5A and FIG. 5B simultaneously, wherein the first + turn screaming field, the new is money Δη;;%;:-)TM :, and other liquid crystal materials parameters and product specifications (including optical and electrical specials), where △!! is the refractive index of the initial state of the liquid crystal and the rotation of a certain angle, ^ the difference in refractive index, d is the thickness of the liquid crystal film And λ is the wavelength to be designed. When providing the liquid crystal voltage level, the following two optical parameters should be considered: (1) The phase difference is 5, and the viewing angle and contrast of the liquid crystal display can be determined by the Α center, where 0 is the liquid crystal axis and the light propagation direction. (Through # is the direction of the vertical teeth out of the liquid crystal display), the meaning is the refractive index of the liquid crystal in the short axis direction, ~ (9) is the refractive index of the liquid crystal at 0 angle, and the value of ^ is between | 〇 to 7Γ. Referring to FIG. 5A, due to the liquid crystal and rubbing alignment film process design, the tilt angle generated will cause light leakage, and when the operation phase exceeds the condition of the material design, that is, the brightness reversal will occur. , resulting in a gradual decrease in perspective and contrast. 12 1292895 15519twf.doc/g

Inverting the voltage, when the brightness change will reverse. Therefore, in the present invention, the adjustment=pointing causes the dynamic adjustment voltage Vdyn to fall between the first voltage VDES_TN and the first voltage VSAT-TN, and the backlight 335' is turned off at this time, so that the human eye does not feel this. When the display is not normal, the breakthrough of the conventional liquid crystal display is limited by the above optical and electrical characteristics, and the effect of accelerating the Pixel full gray-scale reaction speed is achieved. Dan

Γ 'It affects the brightness and color shift of the liquid crystal display (C〇1〇rs 1 }... what kind of h (sin22 (four) faint), where p represents the angle between the transmission axis of the polarizing film and the liquid crystal axis, in the general The liquid crystal display device k糸 sets the P value to a fixed value f (that is, a 45-degree angle), so that (the value of sin22 is always 1 ', the tooth penetration rate depends on the performance. When divination, it means that the light does not penetrate at all. Then, the light indicates complete penetration. In addition, the second voltage Vsat_tn is the voltage across the liquid crystal display of the TN liquid crystal display. When the liquid crystal stops rotating, the brightness will not increase. In addition, the voltage Vtra is added. Tn is a liquid crystal rotation super 'overcompensation film design. Next, when the present invention is applied to a VA type liquid crystal display, the effect of accelerating the full gray scale reaction speed of the halogen is achieved. Please refer to FIG. 6A and FIG. 6B simultaneously, FIG. 6A is FIG. A partial enlarged view of the TV curve of the VA type liquid crystal display is shown. Fig. 6B is a reaction time curve corresponding to the VA type liquid crystal display shown in Fig. 6A, where the reaction time is previously written as 0 gray scale black. The screen displays the value measured as the initial condition. Where 'the third voltage VTRA_ When VA is the voltage of the VA type liquid crystal display, the reaction speed is changed from the fastest to the critical point + ink, and the fourth voltage VDES-VA is based on the characteristics of the VA type liquid crystal display (such as 13 I292895fd〇c/ g Δ η · d and optical specification) determines the optimal operating voltage; and the voltage Vsat-va is the voltage at which the liquid crystal transmittance of the VA liquid crystal display is saturated. As shown in Fig. 6A, when the voltage difference between the liquid crystals increases When the vertically aligned liquid crystal molecules will be poured in the direction of the parallel glass, the transmittance will increase. However, as shown in FIG. 6B, when the voltage difference between the liquid crystals exceeds the third voltage VTRA-VA, the liquid crystal molecules react. The time will increase, that is, the reaction speed will be slower. However, if the average human eye responds to the motion picture, if the liquid crystal display can display 30 images in one second (ie, the reaction time is less than 15 milliseconds), the average human eye will be less. I will feel the reaction slower, so

The conventional liquid crystal display and the towel set the fourth voltage VdeS-Vas so that the reaction speed of the liquid crystal is about 15 milliseconds to obtain a higher transmittance. However, FIG. 6A only represents the reaction time of the liquid crystal molecules from the 〇 gray scale to the maximum gray scale (for example, 255 gray scale), if it is the switching between gray scales (for example, just gray scale to 2 illusion) The reaction time will be longer. For the display of dynamic images, the human eye will still find the phenomenon of residual image. Therefore, 2 fortune, wrap the working point to dynamically adjust the voltage between the v-face 227 and the fourth voltage Vdes VA, and the backlight 335 is turned off at this J, at this time, it is not necessary to consider the influence of the penetration rate, = speed up The reaction speed of liquid crystal molecules is to break the limitation of traditional liquid crystal display write limitation and electrical characteristics to achieve accelerated acne full gray scale reaction. FIG. 7 is a preferred embodiment according to the present invention: Γ cooperate with the device of FIG. 3 (its heart = == Explain. When making the phase 7 and Figure 3, first 'in the step

As indicated above,

[Simplified Schematic Description] The S710' timing controller 325 receives the face data. Then, during the first period, the timing controller 325 turns off the backlight module 337 in step S720, and controls the dynamic voltage switcher 322 to output the dynamic adjustment voltage VDYN to the data driver 329. According to the dynamic adjustment voltage VDYN, in step S730. The display panel 331 is driven by the data drive 329. Then, in the second period, the timing controller 325 activates the backlight module 337 in step S740, and controls the dynamic voltage switch 322 to output the first voltage VDES_TN to the lean driver 329, according to the first voltage in step S760. The VDES TN, the over-lean drive state 329 drives the display panel 331. If not, if the display 330 is a VA type liquid crystal display, the above-mentioned first voltage VDES TN $ needs to be changed to the fourth voltage Vdes va. Of course, the timing controller 325 will receive different facial data and process it in accordance with the method of the present invention. The T-V curves of the TN-type and VA-type liquid crystals shown in Fig. 1A and Fig. 1B are shown. 15 , 1292895 * 15519twf.doc / g Figure 2 shows the reaction time of the liquid crystal display under different gray levels. 3 is a block diagram of a dynamic drive device in accordance with a preferred embodiment of the present invention. 4 is a timing diagram of the dynamic driving device of FIG. 3. Fig. 5A is an enlarged view of a portion of a TN-type liquid crystal display shown in Fig. 1A. Fig. 5B is a graph showing the reaction time of the TN type liquid crystal display shown in Fig. 5A. ~ Fig. 6A is an enlarged view of a portion of the 'τ_ν curve of the VA type liquid crystal display shown in Fig. 1B. Fig. 6 is a graph showing the reaction time of the VA type liquid crystal display piano shown in Fig. 6A. ~ Figure 7 is a dynamic driving method in accordance with a preferred embodiment of the present invention. ~ [Main component symbol description] 201: Reaction time curve of liquid crystal display under different gray scales φ 310 : System 311 : VGA chip 320 : Dynamic drive device 321 : Signal converter 322 : Dynamic voltage switcher 324 : Switcher 325 : Timing Controller 329: data driver 16 * ^92895^ 330 · display device (TN type liquid crystal display) 331 : display panel 333 : inverter 335 : backlight 337 : backlight module PI, P2 : end point FR : face Update rate BLU_OFF: backlight module off ❿ BLU_ON: backlight module start T1: first period T2: second period Vdes_tn: first voltage VsΑΤ_ΤΝ: second voltage VtRA_VA: third voltage VdeS_VA · fourth voltage Vtra_tn, Vsta_va: Voltage dust Vdyn: dynamic adjustment voltage 17

Claims (1)

1292895 15519twf.doc/g X. Patent application scope: including a dynamic driving method for a display device, wherein the display device comprises a display panel and a backlight module, the dynamic driving method is at a first frequency Receiving a facet data; ...turning off the backlight module in a first period, and driving the display panel with a dynamically adjusted voltage according to the written data; and in a second period, starting the backlight module, and The root surface data drives the display panel with a normal driving voltage; wherein, the time of the first period and the time of the second period, the sum of the sum of the rains is greater than the first frequency. ▲ 2. The dynamic driving method of claim 1, wherein the sum of the time of the first period and the time of the second period is twice the sum of the first frequencies. The dynamic driving method according to claim 1, wherein the ratio of the time of reading the first period to the time of the second period is i: i. '4·士一申二月 patent scope of the i-th item of the dynamic driving method, wherein the display device is - twisted nematic (Twisted Nemati ^, when the dynamic adjustment voltage is greater than - the first voltage and small Erbao, the first surface is determined by the maximum value of the normal driving voltage according to the characteristics of the liquid crystal display, and the second voltage, "the liquid crystal voltage increases at both ends, the liquid crystal stops" 18 1292895 * 15519twf The dynamic driving method of claim 1, wherein the dynamic adjustment voltage is greater than one when the display device is a vertical alignment (va) type liquid crystal display device. The third voltage is less than a fourth voltage, wherein the third voltage is the increasing voltage of the liquid crystal at both ends of the VA liquid crystal display, and the reaction speed is changed from the fastest to the threshold voltage, and the voltage is based on the VA. The operating voltage of the agricultural system determined by the characteristics of the liquid crystal display. 亍: the driving device is suitable for the display device, wherein the display device includes a display panel and a backlight module, the dynamic driving device panel; The driver benefits from the light panel to the display panel for driving the display to a dynamic zonal device, the secret to the constant drive voltage and a kinetic energy 坰敕+,,, β receiving a positive output of the normal drive. - Control signal decision and one of ~ [and __ whole voltage; (10) Control, turn to the data drive:: dynamic, pressure switcher, receive a first frequency == two -: two periods Respectfully, the backlight module 5 hai normal drive power®, through the data driver to drive Sir JL, 兮牮w force to become a panel, /, 〒 5 Haidi - the time between the period and the second period The reciprocal is greater than the first frequency. / ]%, both 19 I292895fH / * 15519twf.doc / g (four) 7 two St special, the dynamic drive device described in item 6, wherein i the second rate of the second In the time of Lang, the reciprocal of the sum of the two is the secret of the 6th, and the ratio of the time of the second period is... The moving 11 driving device mentioned in Item 6 of the transfer, in which the clothes are one Twisted nematic (τ^_ N = device dynamic _ greater than - (-) and small Ζ ί: Ι Ι 为 根据 according to the TM type liquid crystal The characteristic of the display is determined by the maximum value of the driving surface of the suspension, and when the voltage across the liquid crystal of the second riding device is gradually increased, the liquid crystal stops rotating as the dynamics mentioned in the sixth item of the patent scope. The driving device, in the basin: the phase is not arranged in a vertical arrangement (Vertical Alignmem, the dynamic adjustment voltage is greater than - the third voltage and less than - 坌: voltage, wherein the third voltage is the VA type When the liquid crystal display liquid and the private pressure gradually increase, the reaction speed is started from the fastest starting voltage, λ, and the fourth voltage is a good operating voltage according to the characteristics of the VA type liquid crystal display. , ^ 20