WO2016106871A1 - 过驱动表的调试方法 - Google Patents
过驱动表的调试方法 Download PDFInfo
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- WO2016106871A1 WO2016106871A1 PCT/CN2015/070926 CN2015070926W WO2016106871A1 WO 2016106871 A1 WO2016106871 A1 WO 2016106871A1 CN 2015070926 W CN2015070926 W CN 2015070926W WO 2016106871 A1 WO2016106871 A1 WO 2016106871A1
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- debugging
- overdrive
- backlight
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- crystal display
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
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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
- G09G2340/00—Aspects of display data processing
- G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
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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
- G09G3/3413—Details of control of colour illumination sources
Definitions
- the present invention relates to the field of driving liquid crystal displays, and more particularly to a method for debugging an overdrive table.
- the driving method of the liquid crystal display includes overdrive.
- the so-called overdrive means that when the corresponding voltage of the target state of the liquid crystal molecules is higher than the current voltage of the liquid crystal molecules, a voltage higher than the target state is applied to the liquid crystal molecules; when the corresponding voltage of the target state of the liquid crystal molecules is lower than the current liquid crystal molecules At the voltage, a voltage lower than the target state is applied to the liquid crystal molecules.
- This applied voltage higher than the target state or lower than the target state is referred to as an overdrive voltage.
- Overdrive can accelerate the rotation of liquid crystal molecules, thereby shortening the gray-scale response time of liquid crystal molecules.
- the specific value of the applied overdrive voltage it is obtained by looking up the table.
- the overdrive table is obtained by querying the overdrive table according to the grayscale value of the target state and the grayscale value of the current state, and the overdrive grayscale value corresponds to the overdrive voltage.
- the overdrive table is generally a set of data stored in the memory. The accuracy of the overdrive table determines the effectiveness of the overdrive mode, that is, whether the gray scale response time of the liquid crystal molecules can be significantly shortened.
- an overdrive table is mainly based on experimental means. First, a certain amount of debugging data is recorded separately through multiple experiments, and based on these debugging data, an overdrive table is established by a manual or specific algorithm.
- the overdrive table obtained by the debugging method of the prior art is used to drive the liquid crystal display panel, the display effect in the experiment is often not achieved.
- the reason for this problem is that the debugging conditions in the debugging experiment are relatively simple, ignoring the comprehensive influence of various other factors on the display effect of the liquid crystal display in actual use.
- the overdrive table is generally debugged with a single color of light (mainly white light) as a backlight.
- One of the technical problems to be solved by the present invention is to establish a debugging method for an overdrive table that comprehensively considers the actual use of the liquid crystal display.
- an embodiment of the present application provides a method for debugging an overdrive table, including: partitioning a backlight according to a partition mode of a liquid crystal display; and selecting a backlight according to two color fields of the liquid crystal display as a debugging different primary colors.
- the backlight used when driving the watch; the backlight is illuminated based on the refresh rate of the color field of the liquid crystal display, and the overdrive grayscale values in the overdrive tables of different primary colors are debugged.
- the backlight of the two color field backlights of the liquid crystal display that best reflects the primary color is used as a backlight for debugging.
- red overdrive table when the red overdrive table is debugged, a red backlight is selected; when the green and blue overdrive tables are debugged, a white backlight or a cyan backlight is selected.
- the overdrive grayscale values in the overdrive tables of different primary colors are debugged based on an optional one partition.
- overdrive grayscale values in overdrive tables of different primary colors are debugged, and an overdrive table corresponding to each of the partitions is respectively obtained.
- the refresh rate of the backlight used in debugging is 120 Hz.
- the duty ratio of the refresh frequency of the backlight used in debugging is 10% to 40%.
- the embodiment of the present application establishes the debugging condition of the overdrive table by using the backlight partition and the backlight when the liquid crystal display is actually used, so that the debugging condition of the overdrive table is more in line with the actual use condition of the liquid crystal display, thereby significantly improving the debugging. Overdrive table accuracy, and further better display.
- FIG. 1 is a schematic flow chart of a method for debugging an overdrive table according to an embodiment of the present application
- FIG. 2 is a schematic diagram of a debugging process of an overdrive table of a TGB-FSC liquid crystal display according to an embodiment of the present application
- FIG. 3 is a schematic structural diagram of an LED backlight according to an embodiment of the present application.
- FIG. 1 is a schematic flowchart of a method for debugging an overdrive table according to an embodiment of the present application
- FIG. 2 is a schematic diagram of a debugging process of an overdrive table of a TGB-FSC liquid crystal display according to an embodiment of the present application
- step S110 the backlight is partitioned according to the partition mode of the liquid crystal display.
- step S120 a backlight used as an overdrive table for debugging different primary colors (red, blue, or green) is selected according to the backlights of the two color fields of the liquid crystal display.
- the main basis for partitioning the backlight is the partition mode adopted by the backlight of the liquid crystal display to which the overdrive table is applied, and is lit according to the backlight brightness of different partitions. Further, for different partitions to be debugged, an overdrive table corresponding to different partitions can also be obtained separately.
- One of the benefits of partitioning the backlight when debugging a driver table is to reduce the interaction between backlight partitions.
- the influence factor of the backlight partition is taken into consideration when debugging the overdrive table, that is, the debugging condition consistent with the actual use of the liquid crystal display is established, which is easy to understand.
- the overdrive table debugged under such conditions has good adaptability to mutual interference between different backlight partitions.
- a liquid crystal display in which the backlight is divided into four regions in the direction of line scanning in actual use, and the backlight used for debugging is also scanned along the line when debugging the overdrive table.
- the direction is divided into four zones, and at the same time, the backlight is illuminated according to the brightness of the backlight obtained from the test chart (see VESA standard).
- debug for different partitions, respectively obtaining four sets of overdrive tables corresponding to the four partitions, wherein each set of overdrive tables includes red, green and blue overdrive tables.
- the three primary colors are generally formed by transmission of backlights of different colors via different color fields.
- the overdrive table used in this type of liquid crystal display if the single-color light (mainly white light) is still used as the backlight to debug the overdrive table, the debugging accuracy is inevitably affected.
- the backlight used for debugging the red, blue, and green overdrive tables is selected according to the backlights of the two color fields when the liquid crystal display is actually used. Specifically, if the red overdrive table is debugged, a backlight including a primary color of red is selected from the backlights of the two color fields as a backlight for debugging, and if the blue overdrive table is debugged, the two color fields are In the backlight, a backlight including a primary color of blue is selected as a backlight for debugging. If the green overdrive table is debugged, a backlight containing a primary color of green is selected from the backlights of the two color fields as a backlight for debugging.
- TGB-FSC TGB Field Sequential Color liquid crystal display with red and white backlights respectively
- red light is selected as the backlight used for debugging
- white light is selected as the backlight used for debugging
- debugging the blue overdrive table select white light as the backlight used for debugging.
- the backlight colors of the two color fields include red, blue, and green.
- step S130 the backlight is illuminated according to the refresh rate of the color field when the liquid crystal display is actually used, and the overdrive grayscale values in the red, blue, and green overdrive tables are debugged.
- a refresh rate of an FSC liquid crystal display using two color fields for display is 120 Hz, and then the following debugging conditions are established when the overdrive table of the liquid crystal display is debugged, the backlight refresh frequency is 120 Hz, and the backlight is backlit.
- the duty cycle of the refresh frequency is selected according to the requirements of the display effect. Wherein, when the current of the backlight is kept constant, different duty ratios correspond to different backlight brightnesses, and the duty ratio of the backlight refresh frequency can generally be selected within a range of 10%-40% of the backlight period.
- the response speed of the liquid crystal has a certain limit value, and when the response speed is constant, the refresh frequency The greater the duty cycle of the rate, the worse the performance of the color is displayed. Moreover, if the duty ratio of the refresh frequency is low, for example, less than 10%, the power consumption of the backlight is increased. Therefore, when debugging the overdrive table, preferably, the duty ratio of the backlight refresh frequency generally takes its period. 10%-40%, which can reduce power consumption and get better display results.
- FIG. 2 is a schematic diagram of a debugging process of an overdrive table of a TGB-FSC liquid crystal display according to an embodiment of the present application.
- Figure 2 above is the partitioning of the LCD and backlight.
- the red overdrive table is being debugged, in the first color field (as shown in the first set of display and backlight combinations on the left side of Figure 2), the first partition is illuminated with a red backlight, given The overdrive grayscale value scans the first color field.
- a grayscale value higher than the target state is applied to the liquid crystal molecule; when the target state of the liquid crystal molecule has a low grayscale value At the current gray scale value of the liquid crystal molecule, a gray scale value lower than the target state is applied to the liquid crystal molecules (actually, a driving voltage corresponding to the above gray scale value is applied to the liquid crystal molecules).
- the scanning process is sampled by a photoelectric sensor, and the R/G/B brightness-time response curve is recorded by an oscilloscope or a PC with a storage function, and the gray-scale response time from the initial frame grayscale value to the target frame grayscale value ( The sum of the rise time and the fall time) that satisfies the required overdrive voltage value (converted to the corresponding overdrive gray scale value) is recorded in the overdrive table, resulting in a table as shown in the lower part of FIG.
- the horizontal direction of the overdrive table indicates the grayscale value of the current frame picture, that is, the grayscale value of the current state of the liquid crystal molecule
- the vertical direction represents the grayscale value of the target frame picture, that is, the grayscale value of the target state of the liquid crystal molecule.
- the alternate lighting of the backlight partition causes flicker, which causes distortion of the recorded R/G/B brightness-time response curve, and the influence of flicker when debugging the driving table.
- flicker causes distortion of the recorded R/G/B brightness-time response curve, and the influence of flicker when debugging the driving table.
- the measured point is generally selected at the center of the partition.
- an optional partition for example, the second, third or Four partitions.
- the embodiment of the present application uses a single one compared to the prior art.
- the overdrive table for debugging the brightness of the backlight has better adaptability to the liquid crystal display using the backlight division scanning, and the display effect is improved.
- power consumption can be reduced and debugging time can be reduced.
- the debugging result of one partition is applied to another partition, for example, when the debugging result obtained according to the first partition is applied to the second partition of the actual liquid crystal display, there may be an error due to interference between the partitions.
- the presence of the second partition between the first partition and the third partition is slightly brighter than the first partition and the third partition. Therefore, in another embodiment of the present application, a set of overdrive tables is separately debugged for each partition, so that in an actual liquid crystal display, when scanning different partitions, the corresponding overdrive table is used to partition the backlight.
- the interference between the two is considered to be in the debugging of the driving table, for example, the diffusion of the backlight between the partitions, and a more delicate display effect can be obtained.
- FIG. 3 is a schematic structural diagram of an LED backlight according to an embodiment of the present application.
- the LED light source consists of three parts.
- the red light source 3R, the blue light source 3B, and the green phosphor 30G disposed around the red light source and the blue light source.
- the TGB-FSC liquid crystal display using the backlight of the Blue/Red chip+Green phosphor form works as follows: when displaying one frame of picture, the red backlight is illuminated in the first color field, that is, Blue/ The red light source 3R in the red chip+Green phosphor LED is lit, the blue light source 3B is turned off; the white backlight is lit in the second color field, that is, the red light source 3R and the blue light source 3B in the BR chip+Gphosphor LED are simultaneously clicked. Bright, since the blue light source excites the green phosphor 30G located around to emit light, the backlight at this time exhibits an overall white color.
- the first debugging condition is that in the TGB-FSC liquid crystal display using Blue/Red chip+Green phosphor LED as the backlight, when debugging the red overdrive table, red light is selected as the backlight used for debugging, that is, at this time.
- Blue/Red chip+Green phosphor LED red light source 3R lights up, blue light source 3B turns off; when debugging green overdrive table, white light is selected as the backlight used for debugging, ie Blue/Red chip+Green phosphor
- the red light source 3R and the blue light source 3B in the LED are simultaneously lit; when debugging the blue overdrive table, white light is selected as the backlight used for debugging, and the use of the backlight is the same as when the green overdrive table is debugged.
- the second debugging condition is that in the TGB-FSC liquid crystal display using Blue/Red chip+Green phosphor LED as the backlight, when debugging the red overdrive table, red light is selected as the backlight used for debugging, that is, at this time.
- Blue/Red chip+Green phosphor LED red light source 3R lights up, blue light source 3B turns off; when debugging green overdrive table, choose cyan light as the backlight used for debugging, ie Blue/Red chip+Green
- the red light source 3R in the phosphor LED is turned off, and the blue light source 3B is turned on.
- cyan light is selected as the backlight used for debugging, and the backlight is used in the same manner as when the green overdrive table is debugged.
- the red light source is also lit in the second color field of the liquid crystal display in actual use, since the red light source does not excite the green phosphor to generate green light, it is optional to use only the blue backlight to drive the overdrive table. debugging. However, there are some differences in the brightness of the backlight between the two debugging conditions, so the overdrive table obtained by debugging will be slightly different.
- the above two debugging conditions should also make the refresh frequency and duty cycle of the backlight meet the previous debugging conditions.
- the obtained overdrive table can be more in line with the actual use of the liquid crystal display, so that a better display effect can be obtained.
- the backlight is not partitioned.
- the overdrive table obtained after the debugging has a large error.
- the prior art does not consider the influence of backlight alternation when debugging the driver table, and only uses a single backlight, which is generally white light. Since the transmittance of the liquid to different colors (wavelengths) is different, the grayscale value debugged by the white light is applied to the actual driving of the liquid crystal display using the color backlight, and there is a large error, and Get a good display.
- the embodiments of the present application take into account the above-mentioned adverse influencing factors, and are embodied in the obtained overdrive table, that is, the overdrive table debugged according to the method of the present application. More in line with the actual use of the liquid crystal display, so that the liquid crystal display to obtain a better display.
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Abstract
一种过驱动表的调试方法,包括以下步骤:根据液晶显示器的分区模式对背光进行分区(S110);根据液晶显示器的两个色场的背光选取作为调试不同基色的过驱动表时使用的背光(S120);基于液晶显示器的色场的刷新频率点亮背光,对不同基色的过驱动表中的过驱动灰阶值进行调试(S130)。过驱动表的调试方法将影响液晶显示器显示效果的多种因素应用于调试过驱动表的过程,提高了过驱动表的精度,获得了更好的显示效果。
Description
相关申请的交叉引用
本申请要求享有2014年12月31日提交的名称为“过驱动表的调试方法”的中国专利申请CN201410855186.9的优先权,该申请的全部内容通过引用并入本文中。
本发明涉及液晶显示器的驱动领域,尤其涉及一种过驱动表的调试方法。
目前,液晶显示器的驱动方式包括过驱动。所谓过驱动,就是当液晶分子的目标状态的对应电压高于液晶分子当前的电压时,就施加一个高于目标状态的电压给液晶分子;当液晶分子的目标状态的对应电压低于液晶分子当前的电压时,就施加一个低于目标状态的电压给液晶分子。这个施加的高于目标状态或低于目标状态的电压称为过驱动电压。
过驱动可以使液晶分子加速转动,从而缩短液晶分子的灰阶响应时间。至于施加的过驱动电压的具体数值,则通过查表得到。具体为,根据目标状态的灰阶值和当前状态的灰阶值查询过驱动表得到一个过驱动灰阶值,该过驱动灰阶值与过驱动电压相对应。过驱动表一般是存放在内存中的一组数据,过驱动表的精度决定了过驱动方式的有效性,即是否能够显著地缩短液晶分子的灰阶响应时间。
现有技术中,过驱动表的获得主要是基于实验的手段。先通过多次实验分别记录一定量的调试数据,再基于这些调试数据,通过人工的或特定的算法建立过驱动表。
但是,当利用现有技术中这种调试方法得到的过驱动表对液晶显示面板进行驱动时,往往达不到实验中的显示效果。导致这种问题的原因是由于调试实验中调试的条件比较单一,忽略了多种其他因素在液晶显示器的实际使用中对其显示效果的综合影响。例如现有技术中,普遍以单一颜色的光(主要是白光)作为背光源对过驱动表进行调试。
综上,亟需建立一种综合考虑液晶显示器的实际使用情况的过驱动表的调试方法,以解决上述问题。
发明内容
本发明所要解决的技术问题之一是需要建立一种综合考虑液晶显示器的实际使用情况的过驱动表的调试方法。
为了解决上述技术问题,本申请的实施例提供了一种过驱动表的调试方法,包括:根据液晶显示器的分区模式对背光进行分区;根据液晶显示器的两个色场的背光选取作为调试不同基色的过驱动表时使用的背光;基于液晶显示器的色场的刷新频率点亮背光,对不同基色的过驱动表中的过驱动灰阶值进行调试。
优选地,在调试一种基色的过驱动表时,将液晶显示器两个色场背光中最能体现该基色的背光作为调试时使用的背光。
优选地,在调试红色过驱动表时,选取红色背光;在调试绿色以及蓝色过驱动表时,选取白色背光或青色背光。
优选地,基于任选的一个分区,对不同基色的过驱动表中的过驱动灰阶值进行调试。
优选地,针对各个所述分区,调试不同基色的过驱动表中的过驱动灰阶值,分别得到与每个所述分区相对应的过驱动表。
优选地,调试时使用的背光的刷新频率为120Hz。
优选地,调试时使用的背光的刷新频率的的占空比为10%-40%。
与现有技术相比,上述方案中的一个或多个实施例可以具有如下优点或有益效果:
本申请的实施例通过利用液晶显示器实际使用时的背光分区与背光交替建立过驱动表的调试条件,使得过驱动表的调试条件更加符合液晶显示器的实际使用情况,因而可以显著地提高所调试的过驱动表的精度,并进一步获得了更好的显示效果。
本发明的其它特征和优点将在随后的说明书中阐述,并且部分地从说明书中变得显而易见,或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图用来提供对本发明的进一步理解,并且构成说明书的一部分,与本发明的实施例共同用于解释本发明,并不构成对本发明的限制。在附图中:
图1为根据本申请实施例的过驱动表的调试方法的流程示意图;
图2为根据本申请实施例的TGB-FSC液晶显示器的过驱动表的调试过程示意图;
图3为根据本申请实施例的LED背光源的结构示意图。
以下将结合附图及实施例来详细说明本发明的实施方式,借此对本发明如何应用技术手段来解决技术问题,并达成技术效果的实现过程能充分理解并据以实施。需要说明的是,只要不构成冲突,本发明中的各个实施例以及各实施例中的各个特征可以相互结合,所形成的技术方案均在本发明的保护范围之内。
图1为根据本申请实施例的过驱动表的调试方法的流程示意图,图2为根据本申请实施例的TGB-FSC液晶显示器的过驱动表的调试过程示意图,下面一边参考图1和图2一边对本申请实施例的调试方法进行说明,本发明的过驱动表的调试方法可被应用于利用两色场进行显示的FSC液晶显示器中。
在步骤S110中,根据液晶显示器的分区模式对背光进行分区。
在步骤S120中,根据液晶显示器的两个色场的背光选取作为调试不同基色(红色、蓝色或绿色)的过驱动表时使用的背光。
具体地,在对过驱动表进行调试时,对背光进行分区的主要依据是应用该过驱动表的液晶显示器的背光所采用的分区模式,并根据不同分区的背光亮度进行点亮。进一步地,针对不同的分区进行调试,还可以分别得到与不同分区相对应的过驱动表。在调试过驱动表时对背光进行分区的好处之一是可以降低背光分区之间的相互影响。
现有液晶显示器多采用背光分区的方式进行驱动。采用背光分区进行驱动的优点是可以提高画面在显示时的对比度、消除液晶显示器在显示动态画面时的拖尾现象以及降低液晶显示器的能耗。但背光分区在带来上述有益效果的同时也存在一些问题,最主要的就是不同背光分区之间的相互影响。具体为,一个分区的背光会扩散传播到与其临近的其他分区。而这种影响会最终表现在液晶显示器所显示的画面上。
在本申请的实施例中,在对过驱动表进行调试的时候就将背光分区的这种影响因素考虑进来,即建立起与液晶显示器实际使用时相一致的调试条件,容易理
解,在这种条件下调试出来的过驱动表对不同背光分区之间的互相干扰具有很好的适应能力。
举例而言,如图2所示,一个在实际使用中将背光沿行扫描的方向分成四个区的液晶显示器,在对其过驱动表进行调试的时候也将调试所用的背光沿行扫描的方向分成四个区,同时,根据由测试图(参见VESA标准)得到的背光亮度对背光进行点亮。还可以针对不同的分区进行调试,分别得到与四个分区相对应的四组过驱动表,其中,每组过驱动表均包括红色、绿色和蓝色过驱动表。
进一步地,对于采用彩色场时序(Field Sequential Color,FSC)显示原理的液晶显示器,其三基色一般会经由不同的色场由不同颜色的背光透射形成。显然,对于该类液晶显示器所应用的过驱动表来说,如果仍然应用单一颜色的光(主要是白光)作为背光源对过驱动表进行调试,必然影响其调试精度。
在本申请的实施例中,根据液晶显示器实际使用时的两个色场的背光选取作为调试红色、蓝色以及绿色过驱动表时使用的背光。具体为,若对红色过驱动表进行调试,则从两色场的背光中选取包含红色这种基色的背光作为调试用的背光,若对蓝色过驱动表进行调试,则从两色场的背光中选取包含蓝色这种基色的背光作为调试用的背光,若对绿色过驱动表进行调试,则从两色场的背光中选取包含绿色这种基色的背光作为调试用的背光。
举例而言,在一种分别以红光和白光作为背光的TGB-FSC(TGB Field Sequential Color)液晶显示器中,对红色过驱动表进行调试时,选择红光作为调试时使用的背光;对绿色过驱动表进行调试时,选择白光作为调试时使用的背光;对蓝色过驱动表进行调试时,选择白光作为调试时使用的背光。
一般的,液晶显示器在实际使用时,两个色场的背光颜色包含红色、蓝色和绿色。
在步骤S130中,根据液晶显示器实际使用时的色场的刷新频率点亮背光,对红色、蓝色以及绿色过驱动表中的过驱动灰阶值进行调试。
例如,在一个例子中,一个利用两色场进行显示的FSC液晶显示器的刷新频率为120Hz,那么在对该液晶显示器的过驱动表进行调试的时候建立如下的调试条件,背光刷新频率120Hz,背光刷新频率的占空比根据显示效果的要求进行选取。其中,当背光源的电流保持恒定时,不同的占空比与不同的背光亮度相对应,背光刷新频率的占空比一般可以在背光周期的10%-40%的范围内选取。
实际中,液晶的响应速度具有一定的极限值,当其响应速度一定时,刷新频
率的占空比越大,则显示时颜色的表现就越差。而且若刷新频率的占空比较低,例如小于10%时,则背光的功耗就会增加,所以在对过驱动表进行调试时,优选地,背光刷新频率的占空比一般取其周期的10%-40%,这样既可以降低功耗,又可以获得比较好的显示效果。
图2为根据本申请实施例的TGB-FSC液晶显示器的过驱动表的调试过程示意图。在图2中,位于上方的是液晶显示器和背光的分区情况。假设正在对红色过驱动表进行调试,在第一色场中(如图2中左侧的第一组显示器和背光组合所示),先用红色背光点亮了第一分区,以给定的过驱动灰阶值对第一色场进行扫描。具体为,当液晶分子的目标状态的灰阶值高于液晶分子当前的灰阶值时,就施加一个高于目标状态的灰阶值给液晶分子;当液晶分子的目标状态的灰阶值低于液晶分子当前的灰阶值时,就施加一个低于目标状态的灰阶值给液晶分子(实际中是将与上述灰阶值相对应的驱动电压施加于液晶分子)。在完成第一色场的扫描之后进入第二色场(如图2中右侧的第二组显示器和背光组合所示),在第二色场中,仍然用红色背光点亮第一分区,以给定的过驱动灰阶值对第二色场进行扫描。后续,在调试过驱动表中的每个值时都需多次重复上述过程。
通过光电传感器对扫描过程进行采样,并借助带存储功能的示波器或PC机记录R/G/B亮度-时间响应曲线,将从初始帧灰阶值到达目标帧灰阶值的灰阶响应时间(上升时间和下降时间的和)满足要求的过驱动电压值(转换为相应的过驱动灰阶值)记录在过驱动表中,进而得到如图2下方所示的表格。该过驱动表的横向表示的是当前帧画面的灰阶值,即液晶分子的当前状态的灰阶值,纵向表示的是目标帧画面的灰阶值,即液晶分子的目标状态的灰阶值。
在采用背光分区显示的液晶显示器中,背光分区的交替点亮会造成闪烁,进而导致记录的R/G/B亮度-时间响应曲线产生失真,在调试过驱动表的时候也要将闪烁的影响考虑进去。此时,一方面,需要采用瞬态响应灵敏、具有很好的线性范围、且动态性能好的光电传感器;另一方面,对记录得到的R/G/B亮度-时间响应曲线进行滤波处理,以降低噪音的影响,例如可采用中值滤波算法对响应曲线进行处理。
调试时,被测点一般选取在分区的中心位置,当只调试一套过驱动表时,选择第一分区进行调试并不是必须的,基于任选的一个分区(例如第二、第三或第四分区)调试过驱动表都是可行的。在实际应用中,由于本申请实施例在调试过驱动表时还对调试所用的背光亮度进行了设置,所以相比于现有技术中使用单一
背光亮度进行调试的过驱动表,对应用背光分区扫描的液晶显示器具有更好的适应能力,显示效果得到改善。而且,由于只需对一个分区进行调试,因此能够降低功耗,减少调试时间。
考虑到将一个分区的调试结果应用于另一个分区时,例如根据第一分区得到的调试结果应用于实际的液晶显示器的第二分区的时候,可能会存在误差,这是由于分区之间的干扰的存在,所以介于第一分区和第三分区之间的第二分区的背光亮度会稍亮于第一分区和第三分区。因此,在本申请的另一个实施例中,针对每一个分区分别调试一套过驱动表,这样在实际的液晶显示器中,在对不同分区进行扫描的时候使用对应的过驱动表,将背光分区之间的干扰考虑进过驱动表的调试中,例如分区之间的背光的扩散作用,可以获得更加细腻的显示效果。
图3为根据本申请实施例的LED背光源的结构示意图。如图所示,该LED光源由三部分组成。红色光源3R,蓝色光源3B以及设置于红色光源和蓝色光源四周的绿色荧光粉30G。
在实际中使用这种Blue/Red chip+Green phosphor形式的背光源的TGB-FSC液晶显示器的工作过程为:当显示一帧画面时,在第一色场点亮红色背光,即此时Blue/Red chip+Green phosphor LED中的红色光源3R点亮,蓝色光源3B关闭;在第二色场点亮白色背光,即此时BR chip+Gphosphor LED中的红色光源3R和蓝色光源3B同时点亮,由于蓝色光源会激发位于四周的绿色荧光粉30G进行发光,所以此时的背光呈现整体的白色。
在对该液晶显示器的过驱动表进行调试的时候,可以在下述两种调试条件下进行。
第一种调试条件为,在采用Blue/Red chip+Green phosphor LED作为背光源的TGB-FSC液晶显示器中,对红色过驱动表进行调试时,选择红光作为调试时使用的背光,即此时Blue/Red chip+Green phosphor LED中的红色光源3R点亮,蓝色光源3B关闭;对绿色过驱动表进行调试时,选择白光作为调试时使用的背光,即此时Blue/Red chip+Green phosphor LED中的红色光源3R和蓝色光源3B同时点亮;对蓝色过驱动表进行调试时,选择白光作为调试时使用的背光,背光源的使用与调试绿色过驱动表时相同。
进一步对TGB-FSC液晶显示器的实际使用情况进行分析可知,经由第一色场透射的红色主要是由Blue/Red chip+Green phosphor LED中的红色光源产生的,经由第二色场透射的蓝色和绿色主要是由Blue/Red chip+Green phosphor LED
中的蓝色光源以及由蓝色光源激发的绿色荧光粉产生的,所以依据之前的调试时所用的背光的选取原则可以建立调试该液晶显示器的过驱动表的第二种调试条件。
第二种调试条件为,在采用Blue/Red chip+Green phosphor LED作为背光源的TGB-FSC液晶显示器中,对红色过驱动表进行调试时,选择红光作为调试时使用的背光,即此时Blue/Red chip+Green phosphor LED中的红色光源3R点亮,蓝色光源3B关闭;对绿色过驱动表进行调试时,选择青色光作为调试时使用的背光,即此时Blue/Red chip+Green phosphor LED中的红色光源3R关闭,蓝色光源3B点亮;对蓝色过驱动表进行调试时,选择青色光作为调试时使用的背光,背光源的使用与调试绿色过驱动表时相同。
尽管液晶显示器在实际使用时的第二色场中红色光源也是点亮的,但由于红色光源并不会激发绿色荧光粉而产生绿色光,所以可以选择仅使用蓝色背光源对过驱动表进行调试。但两种调试条件在背光亮度上会有一定的差别,因此调试得到的过驱动表也会稍有不同。
另外,上述两种调试条件也应该使背光的刷新频率和占空比满足之前的调试条件。
通过采用本发明的方法对过驱动表进行调试,可以使得到的过驱动表更加符合液晶显示器的实际使用情况,因此能够获得更好的显示效果。
现有技术在调试过驱动表时,不考虑对背光进行分区,那么对于在实际使用中对背光进行分区扫描的液晶显示器来说,调试后得到的过驱动表存在较大的误差。而且,而现有技术在调试过驱动表时还未考虑背光交替的影响,只使用单一背光,一般为白光。由于液晶对不同颜色(波长)的光的透过率是不同的,所以以白光调试出来的灰阶值被应用到使用彩色背光的液晶显示器的实际驱动的时候会存在较大的误差,也无法获得优质的显示效果。
本申请的实施例在对过驱动表进行调试的过程中,将上述不利的影响因素都考虑进来,集中体现于得到的过驱动表中,就是说,根据本申请的方法调试得到的过驱动表更符合液晶显示器实际使用时的情况,使液晶显示器获得更加优质的显示效果。
虽然本发明所公开的实施方式如上,但所述的内容只是为了便于理解本发明而采用的实施方式,并非用以限定本发明。任何本发明所属技术领域内的技术人员,在不脱离本发明所公开的精神和范围的前提下,可以在实施的形式上及细节
上作任何的修改与变化,但本发明的专利保护范围,仍须以所附的权利要求书所界定的范围为准。
Claims (7)
- 一种过驱动表的调试方法,包括:根据液晶显示器的分区模式对背光进行分区;根据液晶显示器的两个色场的背光选取作为调试不同基色的过驱动表时使用的背光;基于液晶显示器的色场的刷新频率点亮背光,对不同基色的过驱动表中的过驱动灰阶值进行调试。
- 根据权利要求1所述的调试方法,其中,在调试一种基色的过驱动表时,将液晶显示器两个色场背光中最能体现该基色的背光作为调试时使用的背光。
- 根据权利要求2所述的调试方法,其中,在调试红色过驱动表时,选取红色背光;在调试绿色以及蓝色过驱动表时,选取白色背光或青色背光。
- 根据权利要求1所述的调试方法,其中,基于任选的一个所述分区,对不同基色的过驱动表中的过驱动灰阶值进行调试。
- 根据权利要求1所述的调试方法,其中,针对各个所述分区,调试不同基色的过驱动表中的过驱动灰阶值,分别得到与每个所述分区相对应的过驱动表。
- 根据权利要求1所述的调试方法,其中,调试时使用的背光的刷新频率为120Hz。
- 根据权利要求6所述的调试方法,其中,所述刷新频率的占空比为10%-40%。
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