WO2017000368A1 - 基于子像素信号亮暗切换时过驱动目标值的计算方法 - Google Patents

基于子像素信号亮暗切换时过驱动目标值的计算方法 Download PDF

Info

Publication number
WO2017000368A1
WO2017000368A1 PCT/CN2015/088078 CN2015088078W WO2017000368A1 WO 2017000368 A1 WO2017000368 A1 WO 2017000368A1 CN 2015088078 W CN2015088078 W CN 2015088078W WO 2017000368 A1 WO2017000368 A1 WO 2017000368A1
Authority
WO
WIPO (PCT)
Prior art keywords
brightness
target value
overdrive
response curve
time
Prior art date
Application number
PCT/CN2015/088078
Other languages
English (en)
French (fr)
Inventor
陈黎暄
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US14/780,062 priority Critical patent/US9892674B2/en
Publication of WO2017000368A1 publication Critical patent/WO2017000368A1/zh

Links

Images

Classifications

    • 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
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • 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
    • G09G3/2003—Display of colours
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0443—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations
    • G09G2300/0447—Pixel structures with several sub-pixels for the same colour in a pixel, not specifically used to display gradations for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • 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
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
    • 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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the 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
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of MVA-LCD technology, and in particular, to a method for calculating an overdrive target value based on sub-pixel signal light-dark switching.
  • each pixel unit (pixel) is divided into a main pixel area (Sub pixel) and a sub-pixel area (Sub pixel) having unequal areas, and a main pixel area in the same pixel unit and
  • the sub-pixel regions are connected to different data lines and the same gate line.
  • signals can be separately supplied to the main pixel area and the sub pixel area (Sub pixel), thereby bringing about the possibility of improving the large viewing angle display effect by using different gamma curves.
  • the 2D1G technology will bring about a drop in penetration rate.
  • a method for calculating an overdrive target value based on sub-pixel signal light-dark switching comprising:
  • S1 performing four-frame dynamic switching according to a starting gray level and a ending gray level of a table in the driving table to be filled, and the four frames include the first frame to the fourth frame;
  • step S3 Determine, by using the brightness value of the third frame in step S1 as the target brightness, whether the brightness in the R/G/B brightness-time response curve of the overdrive target value matches the target brightness, and if yes, go to the step. S4, otherwise steps S2 to S3 are repeated, and the matching rules include:
  • the maximum brightness in the R/G/B brightness-time response curve of the overdrive target value does not exceed 110% of the target brightness
  • the minimum brightness in the R/G/B brightness-time response curve of the overdrive target value is not less than 90% of the target brightness
  • the low gray level is a gray level smaller than the first preset threshold
  • the high gray level is a gray level higher than the second preset threshold
  • the first preset threshold is smaller than the second preset threshold
  • the first preset threshold is 50 gray scales
  • the second preset threshold is 200 gray scales
  • the low gray scale is less than 50 gray scales
  • the high gray scale is greater than 200 gray scales.
  • the method further includes:
  • the R/G/B luminance-time response curve obtained in step S2 is subjected to noise reduction smoothing processing.
  • the noise reduction smoothing process in the step S2 is performed using a median filter.
  • the driving table to be filled in is a 17*17 or 33*33 or 65*65 overdrive table, and the starting ash of the table to be filled in the driving table according to each step S1 is repeated. There is at least one difference between the order and the stop gray level.
  • the overdrive target value tried each time the step S2 is repeated is different.
  • the overdrive target values in the step S2 are tried in ascending order according to the repetition order.
  • the overdrive target values in the step S2 are tried in descending order according to the repetition order.
  • the overdrive target value is determined in the step S4 by comparing the raw data of the R/G/B luminance-time response curve.
  • the third frame has a luminance value of 3000 lumens.
  • the invention can realize fast switching between high gray level (>200) and low gray level ( ⁇ 50) in H/L conversion, and does not cause penetration while taking into account a large viewing angle.
  • the rate of decline can realize fast switching between high gray level (>200) and low gray level ( ⁇ 50) in H/L conversion, and does not cause penetration while taking into account a large viewing angle. The rate of decline.
  • FIG. 1 is a specific flowchart of a method for calculating an overdrive target value based on sub-pixel signal light-dark switching in the present invention.
  • the LCS design of the BH/BL has been proposed in the prior art, and based on this design, the large viewing angle effect can be improved while ensuring the transmittance.
  • time domain based LCS technology is proposed to prevent the problem of resolution reduction.
  • the above-mentioned invention about the time domain brings about a problem of derivation, that is, flickering of the picture.
  • the sub-pixel signal completes the H-L change, and may enter the H-L change cycle in the next frame. Since the difference of H-L is sometimes large, it will bring more obvious differences in brightness perception. Especially when Green Sub-pixel is added to the transform, the whole picture will show obvious flicker.
  • it can be solved by increasing the frequency of H/L switching, and the display frequency of the display device is changed from 60HZ to higher, for example, 120HZ.
  • the liquid crystal molecules may not be deflected and stabilized to a proper position during the switching period, similar to the shutter type 3D technology. At this time, it may be necessary to drive the Over Drive to make the liquid crystal molecules rotate to the target position quickly, so as to ensure that the brightness of the display does not change significantly, thereby affecting the display effect.
  • the method for calculating the overdrive target value based on the sub-pixel signal light-dark switching in the present invention includes:
  • S1 performing four-frame dynamic switching according to a starting gray level and a ending gray level of a table in the driving table to be filled, and the four frames include the first frame to the fourth frame;
  • step S3 Determine, by using the brightness value of the third frame in step S1 as the target brightness, whether the brightness in the R/G/B brightness-time response curve of the overdrive target value matches the target brightness, and if yes, go to the step. S4, otherwise steps S2 to S3 are repeated, and the matching rules include:
  • the maximum brightness in the R/G/B brightness-time response curve of the overdrive target value does not exceed 110% of the target brightness
  • the minimum brightness in the R/G/B brightness-time response curve of the overdrive target value is not less than 90% of the target brightness
  • the low gray level is a gray level smaller than the first preset threshold
  • the high gray level is a gray level higher than the second preset threshold
  • the first preset threshold is smaller than the second preset threshold
  • the response curve of the gray scale to gray scale of the display device is measured, because one display device There are often 256 gray levels. It is unrealistic to measure all the gray-to-gray brightness curves. According to the storage space and function of the chip itself, the 17*17 or 33*33 or 65*65 overdrive table is often used. However, it is not limited to this.
  • the actual test can measure the response curve of gray scale to gray scale of 65*65, and the middle part is filled by interpolation. In this embodiment, the measurement of 65*65 is taken as an example.
  • the selected table is different for each repetition, that is, the starting gray scale and the ending gray scale of the table in the driving table to be filled according to each repetition are at least one different.
  • the first frame is a driving signal for realizing a grayscale
  • the second frame is a driving signal for realizing a grayscale between a starting grayscale and a ending grayscale
  • the third and fourth frames are for implementing a grayscale termination.
  • Drive signal is a driving signal for realizing a grayscale
  • the overdrive target values that are tried each time are different.
  • the overdrive target values are tried in the order of small to large or large to small, and can be selected according to actual needs. .
  • the R/G/B luminance-time response curve obtained in 2 is subjected to noise reduction smoothing processing using a median filter to improve subsequent calculation speed and calculation accuracy.
  • the luminance value of the third frame is about 3000 lumens (LM)
  • the rules for matching the luminance in the R/G/B luminance-time response curve of the overdrive target value with the target luminance are:
  • the maximum brightness in the R/G/B brightness-time response curve of the overdrive target value does not exceed 110% of the target brightness
  • the minimum brightness in the R/G/B brightness-time response curve of the overdrive target value is not less than 90% of the target brightness
  • the low gray level is a gray level smaller than the first preset threshold
  • the high gray level is a gray level higher than the second preset threshold
  • the first preset threshold is smaller than the second preset threshold.
  • the first preset threshold is 50 gray scales
  • the second preset threshold is 200 gray scales
  • the low gray scale is less than 50 gray scales
  • the high gray scale is greater than 200 gray scales. Satisfy This requirement can achieve a good overdrive effect of high gray scale to low gray scale.
  • the overdrive target value of the attempt is filled in the drive to be filled.
  • the overdrive target value is filled in the drive to be filled.
  • the overdrive target value is filled in the drive to be filled.
  • the response time of the R/G/B brightness-time response curve worthy of the overdrive target of the attempt is R/G/B as compared with the overdrive target value of the corresponding position in the drive table to be filled out.
  • the overdrive target value of the corresponding position in the drive table to be filled in is replaced with the overdrive target value of the attempt, and repeats 2 to 5; when the attempt is overdriven
  • the response time of the R/G/B brightness-time response curve worth of the target is larger than the response time of the R/G/B brightness-time response curve attempted by the overdrive target value of the corresponding position in the drive table to be filled out. Then, the overdrive target value to be filled in the corresponding position in the drive table is used as the overdrive target value finally determined by the corresponding position, and is transferred to 7.
  • the overdrive target value can be determined by comparing the raw grayscale to 32 and the target grayscale containing the raw data of the R/G/B luminance-time response curve of 0-255 grayscale.
  • the conventional overdrive only works on dynamic pictures, and the overdrive in the present invention works in both the static picture and the dynamic picture because it is used in the Temporal LCS design of the H/L conversion. Because even if the static picture is in the H/L conversion of the time series conversion, the gray level of its sub-pixel is in the continuous switching state.
  • the present invention can achieve fast switching between high gray scale (>200) and low gray scale ( ⁇ 50) in H/L transform by setting a stronger brightness matching rule, and taking into account the large The viewing angle does not cause a drop in the penetration rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

公开了一种基于子像素信号亮暗切换时过驱动目标值的计算方法，通过按照一定顺序尝试过驱动目标值来确定符合目标亮度的过驱动目标值的R/G/B亮度-时间响应曲线，比较符合目标亮度的R/G/B亮度-时间响应曲线的响应时间，并从中确定过驱动目标值，进而可以自动计算过驱动表格中的过驱动目标值，匹配规则包括：当子像素从低灰阶切换到高灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最大亮度不超过目标亮度的110％；当子像素从高灰阶切换到低灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最小亮度不低于目标亮度的90％。通过设置更强的亮度匹配规则，可以实现H/L变换中高灰阶和低灰阶之间进行快速切换，兼顾了大视角和穿透率。

Description

基于子像素信号亮暗切换时过驱动目标值的计算方法 技术领域
本发明涉及MVA-LCD技术领域，特别是涉及一种基于子像素信号亮暗切换时过驱动目标值的计算方法。
背景技术
在MVA LCD显示设备中，大视角的图像容易因为cell gap不均产生大视角漏光(wash out)现象。业界提出了很多改善此大视角显示效果的方案，譬如multi-domain，1G1D coupling以及2D1G技术。
所谓2D1G技术，就是指在液晶面板中，将每一像素单元(pixel)分为面积不等的主像素区域(Main pixel)和次像素区域(Sub pixel)，同一像素单元中的主像素区域和次像素区域连接到不同的数据线(Data line)和相同扫描线(Gate line)。通过对主像素区域和次像素区域输入不同的数据信号(不同的灰阶值)，产生不同的显示亮度和斜视亮度，达到降低侧看或斜视时产生的色偏问题。在2D1G的技术中，可以对主像素区域(Main pixel)和次像素区域(Sub pixel)分别提供信号，由此带来了通过采用不同的gamma曲线来改善大视角显示效果的可能。但是2D1G的技术，会带来穿透率的下降问题。
因此，针对上述技术问题，有必要提供一种基于子像素信号亮暗切换时过驱动目标值的计算方法。
发明内容
为克服现有技术的不足，兼顾大视角的效果和穿透率，本发明的目的在于提供一种基于子像素信号亮暗切换时过驱动目标值的计算方法。
为了实现上述目的，本发明实施例提供的技术方案如下：
一种基于子像素信号亮暗切换时过驱动目标值的计算方法，所述方法包括：
S1、根据待填写过驱动表中一个表格的起始灰阶与终止灰阶，进行四帧动态切换，四帧包括第一帧至第四帧；
S2、尝试一过驱动目标值，以获得该过驱动目标值的R/G/B亮度-时间响应曲线；
S3、以步骤S1中第三帧的亮度值作为目标亮度，判断所述过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是否与该目标亮度匹配，若匹配则转至步骤S4，否则重复步骤S2至S3，匹配规则包括：
当子像素从低灰阶切换到高灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最大亮度不超过目标亮度的110％；
当子像素从高灰阶切换到低灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最小亮度不低于目标亮度的90％；
其中，低灰阶为小于第一预设阈值的灰阶，高灰阶为高于第二预设阈值的灰阶，第一预设阈值小于第二预设阈值；
S4、若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是第一个与目标亮度相匹配的亮度，则将该过驱动目标值填入待填写过驱动表中对应位置，并重复步骤S2至S3；若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度不是第一个与目标亮度相匹配的亮度，则比较该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间与该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间，转至步骤S5；
S5、当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间小时，则将该待填写过驱动表中对应位置的过驱动目标值替换为该次尝试的过驱动目标值，并重复步骤S2至S4；当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间大时，则以该待填写过驱动表中对应位置的过驱动目标值作为该对应位置最终确定的过驱动目标值，并转至步骤S6；
S6、重复步骤S1至S5，直到完成过驱动表中的所有过驱动目标值的计算。
作为本发明的进一步改进，所述第一预设阈值为50灰阶，第二预设阈值为200灰阶，低灰阶为小于50灰阶，高灰阶大于200灰阶。
作为本发明的进一步改进，所述步骤S2后还包括：
对步骤S2中得到的R/G/B亮度-时间响应曲线进行降噪平滑处理。
作为本发明的进一步改进，所述步骤S2中降噪平滑处理采用中值滤波器完成。
作为本发明的进一步改进，所述待填写过驱动表为17*17或33*33或65*65过驱动表，每一次重复步骤S1时所根据的待填写过驱动表中表格的起始灰阶与终止灰阶至少有一个不同。
作为本发明的进一步改进，每一次重复所述步骤S2所尝试的过驱动目标值不同。
作为本发明的进一步改进，根据重复顺序，所述步骤S2中过驱动目标值是按照从小到大的顺序尝试的。
作为本发明的进一步改进，根据重复顺序，所述步骤S2中过驱动目标值是按照从大到小的顺序尝试的。
作为本发明的进一步改进，所述步骤S4中通过比较R/G/B亮度-时间响应曲线的原始数据来确定过驱动目标值。
作为本发明的进一步改进，所述第三帧的亮度值为3000流明。
本发明通过设置更强的亮度匹配规则，可以实现H/L变换中高灰阶(>200)和低灰阶(<50)之间进行快速切换，在兼顾了大视角的同时不会造成穿透率的下降。
附图说明
图1为本发明中基于子像素信号亮暗切换时过驱动目标值的计算方法的具体流程图。
具体实施方式
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
现有技术中已经提出了BH/BL的LCS设计，基于这种设计，可以在保证穿透率的情况下改善大视角效果。同时还提出了基于时间域的LCS技术，以防止分辨率降低问题的发生。但是，上述关于时域的发明，会带来衍生的问题即画面的闪烁现象。在一帧内，子像素的信号完成了H-L的变化，在下一帧可能又进入H-L的变化循环。由于H-L的差异有时很大，会带来较为明显的亮度感知差异，尤其是在变换中加入了Green Sub-pixel(子像素G)时，整个画面会呈现出明显的闪烁现象。而为了解决这一问题，可以通过提高H/L切换的频率来解决，显示设备的显示频率从60HZ变更到更高，例如120HZ。
当在时间域同时进行H/L的切换，尤其是切换频率较高时，由于液晶本身响应时间的特性，可能导致在切换的周期内液晶分子无法偏转稳定到适当位置，类似快门式3D技术，此时可能需要对其进行Over Drive(过驱动)的驱动，以使液晶分子快速转动到目标位置，保证显示的亮度不发生明显变化，从而影响显示效果。
本发明的目的是提供一种在4 domain(4畴)时间切换的LCS技术中，子像素信号亮暗(H/L)切换时过驱动目标值的计算方法。
由于H/L切换中常常需要在高灰阶(>200)和低灰阶(<50)之间进行快速切换，而不同于普通的图像灰阶变换，其跨度较大，所以在进行过驱动表的计算时，需要设置更强的过驱动目标值，现有的过驱动目标值的计算方法无法应用于本发明中。
参图1所示，本发明中的基于子像素信号亮暗切换时过驱动目标值的计算方法，具体包括：
S1、根据待填写过驱动表中一个表格的起始灰阶与终止灰阶，进行四帧动态切换，四帧包括第一帧至第四帧；
S2、尝试一过驱动目标值，以获得该过驱动目标值的R/G/B亮度-时间响应曲线；
S3、以步骤S1中第三帧的亮度值作为目标亮度，判断所述过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是否与该目标亮度匹配，若匹配则转至步骤S4，否则重复步骤S2至S3，匹配规则包括：
当子像素从低灰阶切换到高灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最大亮度不超过目标亮度的110％；
当子像素从高灰阶切换到低灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最小亮度不低于目标亮度的90％；
其中，低灰阶为小于第一预设阈值的灰阶，高灰阶为高于第二预设阈值的灰阶，第一预设阈值小于第二预设阈值；
S4、若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是第一个与目标亮度相匹配的亮度，则将该过驱动目标值填入待填写过驱动表中对应位置，并重复步骤S2至S3；若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度不是第一个与目标亮度相匹配的亮度，则比较该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间与该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间，转至步骤S5；
S5、当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间小时，则将该待填写过驱动表中对应位置的过驱动目标值替换为该次尝试的过驱动目标值，并重复步骤S2至S4；当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间大时，则以该待填写过驱动表中对应位置的过驱动目标值作为该对应位置最终确定的过驱动目标值，并转至步骤S6；
S6、重复步骤S1至S5，直到完成过驱动表中的所有过驱动目标值的计算。
在本发明一具体实施例中，包括以下步骤：
1、根据待填写过驱动表中一个表格的起始灰阶与终止灰阶，进行四帧动态切换，四帧包括第一帧至第四帧。
在本实施例中，测量显示设备灰阶到灰阶的响应曲线，由于一个显示设备 往往有256个灰阶，如果测量所有的灰阶到灰阶的亮度变化曲线是不现实的，根据芯片本身的存储空间和功能，往往采用17*17或33*33或65*65过驱动表，然不限于此。实际的测试可以测量65*65的灰阶到灰阶的响应曲线，中间部分采用插值来填满，本实施例中以65*65的测量为例。
重复该步骤时，每次重复所选择的表格均不相同，即每次重复所根据的待填写过驱动表中表格的起始灰阶与终止灰阶至少有一个不同。
其中，第一帧为实现起始灰阶的驱动信号，第二帧为实现灰阶介于起始灰阶和终止灰阶之间的驱动信号，第三帧和第四帧为实现终止灰阶的驱动信号。
2、尝试一过驱动目标值，以获得该过驱动目标值的R/G/B亮度-时间响应曲线。
重复该步骤时，每次重复所尝试的过驱动目标值均不相同，按重复的先后顺序，过驱动目标值是按照从小到大或者从大到小的顺序尝试的，具体可以根据实际需要选择。
3、对2中得到的R/G/B亮度-时间响应曲线进行降噪平滑处理。
在该步骤中，采用中值滤波器对2中得到的R/G/B亮度-时间响应曲线进行降噪平滑处理，以提高后续计算速度及计算的准确性。
4、以1中第三帧的亮度值作为目标亮度，判断所述过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是否与该目标亮度匹配，若匹配则转至5，否则重复2至4。
在该步骤中，第三帧的亮度值约为3000流明(LM)，匹配过驱动目标值的R/G/B亮度-时间响应曲线中的亮度与所述目标亮度的规则为：
当子像素从低灰阶切换到高灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最大亮度不超过目标亮度的110％；
当子像素从高灰阶切换到低灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最小亮度不低于目标亮度的90％；
其中，低灰阶为小于第一预设阈值的灰阶，高灰阶为高于第二预设阈值的灰阶，第一预设阈值小于第二预设阈值。本实施例中第一预设阈值为50灰阶，第二预设阈值为200灰阶，低灰阶为小于50灰阶，高灰阶大于200灰阶。满足 该要求可以很好地实现高灰阶到低灰阶的较好过驱动效果。
5、若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是第一个与目标亮度相匹配的亮度，则将该过驱动目标值填入待填写过驱动表中对应位置，并重复2至4；若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度不是第一个与目标亮度相匹配的亮度，则比较该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间与该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间，转至6。
6、当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间小时，则将该待填写过驱动表中对应位置的过驱动目标值替换为该次尝试的过驱动目标值，并重复2至5；当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间大时，则以该待填写过驱动表中对应位置的过驱动目标值作为该对应位置最终确定的过驱动目标值，并转至7。
可以通过比较起始灰阶为32，目标灰阶包含0-255灰阶的R/G/B亮度-时间响应曲线的原始数据来确定过驱动目标值。
7、重复1至6，直到完成过驱动表中的所有过驱动目标值的计算。
传统的过驱动仅对动态画面起作用，而本发明中的过驱动由于使用在H/L变换的Temporal LCS设计中，所以不论静态画面还是动态画面均起作用。因为即使是静态画面在时序变换的H/L变换中，其子像素的灰阶也是处于不断切换状态中的。
由上述技术方案可以看出，本发明通过设置更强的亮度匹配规则，可以实现H/L变换中高灰阶(>200)和低灰阶(<50)之间进行快速切换，在兼顾了大视角的同时不会造成穿透率的下降。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落 在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。

Claims (10)

  1. 一种基于子像素信号亮暗切换时过驱动目标值的计算方法，其中，所述方法包括：
    S1、根据待填写过驱动表中一个表格的起始灰阶与终止灰阶，进行四帧动态切换，四帧包括第一帧至第四帧；
    S2、尝试一过驱动目标值，以获得该过驱动目标值的R/G/B亮度-时间响应曲线；
    S3、以步骤S1中第三帧的亮度值作为目标亮度，判断所述过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是否与该目标亮度匹配，若匹配则转至步骤S4，否则重复步骤S2至S3，匹配规则包括：
    当子像素从低灰阶切换到高灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最大亮度不超过目标亮度的110％；
    当子像素从高灰阶切换到低灰阶时，该过驱动目标值的R/G/B亮度-时间响应曲线中的最小亮度不低于目标亮度的90％；
    其中，低灰阶为小于第一预设阈值的灰阶，高灰阶为高于第二预设阈值的灰阶，第一预设阈值小于第二预设阈值；
    S4、若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度是第一个与目标亮度相匹配的亮度，则将该过驱动目标值填入待填写过驱动表中对应位置，并重复步骤S2至S3；若该次尝试的过驱动目标值的R/G/B亮度-时间响应曲线中的亮度不是第一个与目标亮度相匹配的亮度，则比较该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间与该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间，转至步骤S5；
    S5、当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间小时，则将该待填写过驱动表中对应位置的过驱动目标值替换为该次尝试的过驱动目标值，并重复步骤S2至S4；当该次尝试的过驱动目标值得出的R/G/B亮度-时间响应曲线的响应时间比该待填写过驱动表中对应位置的过驱动目标值尝试得出的R/G/B亮度-时间响应曲线的响应时间大 时，则以该待填写过驱动表中对应位置的过驱动目标值作为该对应位置最终确定的过驱动目标值，并转至步骤S6；
    S6、重复步骤S1至S5，直到完成过驱动表中的所有过驱动目标值的计算。
  2. 根据权利要求1所述的方法，其中，所述第一预设阈值为50灰阶，第二预设阈值为200灰阶，低灰阶为小于50灰阶，高灰阶大于200灰阶。
  3. 根据权利要求1所述的方法，其中，所述步骤S2后还包括：
    对步骤S2中得到的R/G/B亮度-时间响应曲线进行降噪平滑处理。
  4. 根据权利要求3所述的方法，其中，所述步骤S2中降噪平滑处理采用中值滤波器完成。
  5. 根据权利要求1所述的方法，其中，所述待填写过驱动表为17*17或33*33或65*65过驱动表，每一次重复步骤S1时所根据的待填写过驱动表中表格的起始灰阶与终止灰阶至少有一个不同。
  6. 根据权利要求1所述的方法，其中，每一次重复所述步骤S2所尝试的过驱动目标值不同。
  7. 根据权利要求6所述的方法，其中，根据重复顺序，所述步骤S2中过驱动目标值是按照从小到大的顺序尝试的。
  8. 根据权利要求6所述的方法，其中，根据重复顺序，所述步骤S2中过驱动目标值是按照从大到小的顺序尝试的。
  9. 根据权利要求1所述的方法，其中，所述步骤S4中通过比较R/G/B亮度-时间响应曲线的原始数据来确定过驱动目标值。
  10. 根据权利要求1所述的方法，其中，所述第三帧的亮度值为3000流明。
PCT/CN2015/088078 2015-06-29 2015-08-26 基于子像素信号亮暗切换时过驱动目标值的计算方法 WO2017000368A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/780,062 US9892674B2 (en) 2015-06-29 2015-08-26 Method of computing target values based on brightness switching on a subpixel signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510368396.XA CN104900209A (zh) 2015-06-29 2015-06-29 基于子像素信号亮暗切换时过驱动目标值的计算方法
CN201510368396.X 2015-06-29

Publications (1)

Publication Number Publication Date
WO2017000368A1 true WO2017000368A1 (zh) 2017-01-05

Family

ID=54032841

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/088078 WO2017000368A1 (zh) 2015-06-29 2015-08-26 基于子像素信号亮暗切换时过驱动目标值的计算方法

Country Status (3)

Country Link
US (1) US9892674B2 (zh)
CN (1) CN104900209A (zh)
WO (1) WO2017000368A1 (zh)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106855679B (zh) * 2015-12-08 2019-05-03 深圳光峰科技股份有限公司 投影装置及其控制方法
CN106205533B (zh) 2016-08-29 2019-05-07 深圳市华星光电技术有限公司 一种lcd大视角显示的改善方法及装置
CN106448584B (zh) * 2016-08-31 2018-12-18 深圳市华星光电技术有限公司 一种四色面板的过驱动方法
CN108039155B (zh) * 2017-12-28 2020-01-31 深圳市华星光电技术有限公司 获取液晶显示器的过驱动查找表的方法
US10339881B1 (en) * 2017-12-28 2019-07-02 Shenzhen China Star Optoelectronics Technology Co., Ltd. Method of acquiring overdrive look-up table of liquid crystal display
CN108376537B (zh) * 2018-05-11 2020-08-07 惠州市华星光电技术有限公司 一种液晶面板过驱动方法
CN114627827B (zh) * 2020-12-08 2023-10-24 京东方科技集团股份有限公司 灰阶补偿方法、灰阶补偿模组和液晶显示装置
CN112614453B (zh) * 2021-01-07 2022-12-06 深圳市华星光电半导体显示技术有限公司 液晶显示面板响应时间异常的诊断方法及装置
CN112863446B (zh) * 2021-01-22 2022-06-17 京东方科技集团股份有限公司 显示补偿模组、显示补偿方法和显示装置
CN113593491B (zh) * 2021-07-13 2022-08-05 Tcl华星光电技术有限公司 显示面板的驱动方法、显示面板及显示装置
CN114842799B (zh) * 2022-05-20 2024-02-09 昆山工研院新型平板显示技术中心有限公司 显示面板的显示驱动方法、装置、设备及存储介质
CN118037584B (zh) * 2024-04-12 2024-06-14 禹创半导体(深圳)有限公司 一种基于过驱动的图像边界平滑方法、设备及介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006023386A (ja) * 2004-07-06 2006-01-26 ▲ぎょく▼瀚科技股▲ふん▼有限公司 カラーディスプレイにおける輝度制御システム
US20120092387A1 (en) * 2010-10-19 2012-04-19 Chimei Innolux Corporation Stsp Branch Overdriving apparatus and overdriving value generating method
CN102637400A (zh) * 2012-05-04 2012-08-15 贵阳海信电子有限公司 过驱动值查找表的获取方法、获取装置和显示装置
CN103680448A (zh) * 2013-12-11 2014-03-26 深圳市华星光电技术有限公司 计算过驱动目标值的方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5606437A (en) * 1995-03-31 1997-02-25 Rockwell International Direct drive split pixel structure for active matrix liquid crystal displays
US7321699B2 (en) * 2002-09-06 2008-01-22 Rytec Corporation Signal intensity range transformation apparatus and method
US7319449B2 (en) * 2003-07-08 2008-01-15 Seiko Epson Corporation Image display apparatus and image display method
JP2007519177A (ja) * 2003-07-16 2007-07-12 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 均質な明るさを備えた電界発光デバイス
US20050125179A1 (en) * 2003-12-05 2005-06-09 Genesis Microchip Inc. LCD overdrive auto-calibration apparatus and method
US7683868B2 (en) * 2004-02-20 2010-03-23 Genesis Microchip Inc. Extended overdrive table and methods of use thereof for enhancing the appearance of motion on an LCD panel
US7898519B2 (en) * 2005-02-17 2011-03-01 Sharp Laboratories Of America, Inc. Method for overdriving a backlit display
TWI282544B (en) * 2005-01-21 2007-06-11 Himax Tech Inc Operation apparatus, operation method, operation apparatus for overdrive and operation method for overdrive
WO2008090492A1 (en) * 2007-01-24 2008-07-31 Koninklijke Philips Electronics N.V. Lighting device comprising at least one lamp and at least one oled
CN101647056B (zh) * 2007-03-16 2013-01-23 索尼株式会社 图像处理设备、图像显示器和图像处理方法
CN102568399B (zh) * 2010-12-08 2014-03-12 群创光电股份有限公司 过驱动值产生方法
CN102842297B (zh) * 2012-08-31 2015-09-09 京东方科技集团股份有限公司 控制灰阶的方法、灰阶控制装置和液晶显示器
US20150281631A1 (en) * 2012-11-07 2015-10-01 Hitachi Maxell, Ltd. Projection-type video display apparatus
CN204926053U (zh) 2015-09-06 2015-12-30 南昌欧菲光科技有限公司 触摸显示装置
CN105511670A (zh) 2015-11-30 2016-04-20 信利光电股份有限公司 一种具有压力检测功能的触控屏及电子设备
CN105511669A (zh) 2015-11-30 2016-04-20 信利光电股份有限公司 一种具有压力检测功能的触控屏及电子设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006023386A (ja) * 2004-07-06 2006-01-26 ▲ぎょく▼瀚科技股▲ふん▼有限公司 カラーディスプレイにおける輝度制御システム
US20120092387A1 (en) * 2010-10-19 2012-04-19 Chimei Innolux Corporation Stsp Branch Overdriving apparatus and overdriving value generating method
CN102637400A (zh) * 2012-05-04 2012-08-15 贵阳海信电子有限公司 过驱动值查找表的获取方法、获取装置和显示装置
CN103680448A (zh) * 2013-12-11 2014-03-26 深圳市华星光电技术有限公司 计算过驱动目标值的方法

Also Published As

Publication number Publication date
US20170140694A1 (en) 2017-05-18
CN104900209A (zh) 2015-09-09
US9892674B2 (en) 2018-02-13

Similar Documents

Publication Publication Date Title
WO2017000368A1 (zh) 基于子像素信号亮暗切换时过驱动目标值的计算方法
KR101980026B1 (ko) 액정 패널 및 그 구동 방법
CN112767867B (zh) 显示面板及其亮度补偿方法、装置
US9183796B2 (en) Image signal processing method
WO2018120608A1 (zh) 液晶显示装置及其驱动方法
WO2022147953A1 (zh) 显示面板及其像素补偿方法和装置
WO2013002146A1 (ja) 液晶表示装置
CN108039155B (zh) 获取液晶显示器的过驱动查找表的方法
WO2018113188A1 (zh) 显示装置及其驱动方法
WO2018120435A1 (zh) 液晶显示器件及其驱动方法
WO2016179867A1 (zh) 用于控制图像显示的方法
WO2016082313A1 (zh) 一种液晶显示面板的肤色色偏的改善方法及改善系统
JP2017527848A (ja) 液晶パネルのグレースケール値の設定方法及び液晶ディスプレイ
JP2007264211A (ja) 色順次表示方式液晶表示装置用の色表示方法
WO2017008362A1 (zh) 液晶面板的显示改善方法及其设备
KR101980025B1 (ko) 이미지 디스플레이 방법 및 디스플레이 시스템
KR102008073B1 (ko) 액정 패널 및 액정 패널의 픽셀 유닛 설정 방법
US20120169787A1 (en) Method and device for driving pixel of display panel
US20230205014A1 (en) Viewing Angle Compensation Method and Apparatus for Display Panel, and Display Panel
WO2019052042A1 (zh) 显示装置的驱动方法及显示装置
US20160247296A1 (en) Method of Setting Grayscale Value of Liquid Crystal Panel and Liquid Crystal Display
TWI497470B (zh) 顯示面板之驅動方法及顯示面板
WO2019033638A1 (zh) 显示装置的白平衡调整方法和显示装置
WO2019052041A1 (zh) 显示装置的驱动方法及显示装置
CN109949766B (zh) 一种像素矩阵驱动方法及显示装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 14780062

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15896898

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15896898

Country of ref document: EP

Kind code of ref document: A1