KR20080028225A - Method for brightness compensation of lcd panel - Google Patents

Method for brightness compensation of lcd panel Download PDF

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Publication number
KR20080028225A
KR20080028225A KR1020060093783A KR20060093783A KR20080028225A KR 20080028225 A KR20080028225 A KR 20080028225A KR 1020060093783 A KR1020060093783 A KR 1020060093783A KR 20060093783 A KR20060093783 A KR 20060093783A KR 20080028225 A KR20080028225 A KR 20080028225A
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South Korea
Prior art keywords
brightness
lcd panel
panel
unit
pixel
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KR1020060093783A
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Korean (ko)
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유미라
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주식회사 대우일렉트로닉스
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Priority to KR1020060093783A priority Critical patent/KR20080028225A/en
Publication of KR20080028225A publication Critical patent/KR20080028225A/en

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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
    • G09G3/36—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
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • 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

Abstract

A method for compensating the brightness of an LCD panel is provided to measure and store the entire brightness of the LCD panel in a pixel unit by using a CCD(Charge-Coupled Device) camera, control an output unit for controlling the LCD panel to adjust the output of the LCD panel in a part of which the brightness is not approached to a desired brightness value, thereby removing a minute spot through accurate brightness compensation and improving the quality of a screen. A method for compensating the brightness of an LCD(Liquid Crystal Display) panel comprises the following steps of: measuring the entire brightness of the LCD panel in a pixel unit(S10); determining and storing the position and brightness of each of pixel units in the LCD panel(S20); transmitting the stored position and brightness to a main controller and allowing the main controller to determine the position and brightness difference of a part of which the brightness is not approached to a desired reference brightness value through the received position and brightness(S30,S40); storing the determined position and brightness difference in a memory unit(S50); and outputting the position and brightness difference from the memory unit during the control of the LCD panel to compensate the output of the LCD panel in the pixel unit and operate the LCD panel(S60).

Description

ＬＣＤ 패널의 밝기 보정 방법{Method for brightness compensation of LCD panel}Method for brightness compensation of LCD panel {Method for brightness compensation of LCD panel}

도 1 은 본 발명의 일 실시예에 따른 LCD 패널의 밝기 보정 방법을 구현한 장치의 블럭도.1 is a block diagram of an apparatus implementing a brightness correction method of an LCD panel according to an embodiment of the present invention.

도 2 는 본 발명의 일 실시예에 따른 LCD 패널의 밝기 보정 방법을 설명하기 위한 순서도.2 is a flowchart illustrating a brightness correction method of the LCD panel according to an embodiment of the present invention.

도 3 은 본 발명의 일 실시예에 따른 패널의 밝기를 픽셀단위로 측정하는 방법을 도시한 도면.3 is a diagram illustrating a method of measuring brightness of a panel in pixels according to an embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10:PC 20:CCD 카메라10: PC 20: CCD camera

30:패널 40:패널구동부30: panel 40: panel driver

50:주제어부 60:메모리부50: main control unit 60: memory unit

본 발명은 LCD 패널의 밝기 보정 방법에 관한 것으로서, 보다 상세하게는 CCD 카메라로 패널의 최종출력을 픽셀단위로 측정하여 각 부분의 밝기를 산출하여 밝고 어두운 부분의 위치와 밝기를 판단한 후 원하는 밝기에 도달하지 못한 부분을 픽셀단위로 보상하여 픽셀단위로 발생하는 밝기의 차이에 의한 얼룩을 보정하는 LCD 패널의 밝기 보정 방법에 관한 것이다.The present invention relates to a method for compensating the brightness of an LCD panel, and more particularly, to calculate the brightness of each part by measuring the final output of the panel with a CCD camera in units of pixels, and then determining the position and brightness of the bright and dark parts to the desired brightness. The present invention relates to a method of compensating brightness of an LCD panel for compensating for an unreachable portion by a pixel unit to correct an unevenness caused by a difference in brightness generated in a pixel unit.

일반적으로, 정보화 사회에서 LCD의 개발은 눈부시게 발전하고 있으며 그 역활도 중요해지고 있다. In general, the development of LCD in the information society is developing remarkably and its role is also becoming important.

LCD는 자체 발광을 하지 못하기 때문에 일반적으로 사용되는 투과형 LCD에서는 백라이트(backlight)가 꼭 필요할 뿐만 아니라, LCD의 성능은 LCD자체만이 아니라 사용하는 백라이트의 성능에 의존하는 바가 크다.Since LCDs do not emit self-illumination, backlights are not only necessary for a commonly used transmissive LCD, but the performance of LCDs depends not only on the LCD itself but also on the performance of the backlight used.

이러한 백라이트는 크게 도광판, 램프어셈블리, 및 몰드플레임으로 구성되어 있고, LCD의 광원으로 사용되는 램프어셈블리에서 광을 발산하여 패널의 밝기가 표현되므로 이는 광학, 기구적인 요인으로 패널의 부분들의 밝기의 차이가 생김으로 인해서 화면을 보면 밝고 어두운 부분의 차이에 의한 얼룩이 발생하게 된다.This backlight consists of a light guide plate, a lamp assembly, and a mold frame, and the brightness of the panel is expressed by emitting light from the lamp assembly used as the light source of the LCD. Because of this, looking at the screen will cause spots due to differences in the light and dark areas.

이에 따라, LCD 생산업체에서는 제품 출하시에 화이트 밸런스 작업과 같은 밝기보정작업을 통하여 얼룩짐 현상을 보정하여 제품을 출하하였다.As a result, LCD manufacturers shipped the product by correcting the smudge through brightness correction, such as white balance.

그러나, 이러한 종래의 밝기보정은 패널의 중앙부분의 밝기를 측정하여 이에 의해 얻어진 밝기차이를 기준으로 하여 전체적으로 밝기를 균일하게 보정하는 방식으로 하였다. However, the conventional brightness correction is to measure the brightness of the center portion of the panel and to uniformly correct the brightness as a whole based on the brightness difference obtained thereby.

예를 들자면, 10픽셀 × 10픽셀 정도의 크기로 중앙부분의 밝기차이를 측정 후 그에 의해 얻어진 평균적인 밝기차이를 적용하여 패널의 전체화면을 보정함으로 인해서 정확한 밝기보정이 되지 않고 군데군데 미세한 얼룩짐이 발생하는 문제점이 있었다.For example, after measuring the brightness difference of the center part with the size of 10 pixels × 10 pixels, and applying the average brightness difference obtained by it to calibrate the entire screen of the panel, the accurate brightness is not corrected, and there are minute spots There was a problem that occurred.

이와 같은 문제점을 개선하기 위해 창안한 본 발명의 목적은 CCD 카메라를 이용하여 패널 앞면의 전체화면을 각각의 픽셀단위로 밝기를 측정하여 위치와 밝기를 데이터로 저장한 후에 원하는 밝기에 도달하지 못한 부분의 위치를 찾아낸 후 LCD 패널을 제어하는 출력부를 제어하여 원하는 밝기에 도달하지 못한 부분의 영상출력을 조절하여 출력하도록 함으로써, 정확한 밝기보정을 통해서 미세한 얼룩짐을 제거하는 LCD 패널의 밝기 보정 방법을 제공하는 것이다.An object of the present invention, which was devised to improve such a problem, is to measure the brightness of the entire front panel of a panel by each pixel unit using a CCD camera, and then store the position and brightness as data, and then fail to reach the desired brightness. After finding the position of the control panel to control the output panel to control the output of the image that does not reach the desired brightness by adjusting the output, to provide a brightness correction method of the LCD panel to remove fine stains through accurate brightness correction will be.

상기와 같은 목적을 달성하기 위한 본 발명의 구성은 LCD 패널의 전체의 밝기를 픽셀단위로 측정하는 제 1 단계, 상기 LCD 패널의 각 픽셀단위들에 대한 위치와 밝기를 판단하여 저장하는 제 2 단계, 상기 저장한 위치와 밝기를 주제어부로 전송하고 주제어부는 전송받은 위치와 밝기를 통해서 원하는 밝기의 기준치에 도달하지 못한 부분의 위치와 밝기차이를 판단하는 제 3 단계, 상기 제 3 단계에서 판단한 위치와 밝기차이를 메모리부에 저장하는 제 4 단계, 및 LCD 패널 컨트롤시 상 기 메모리부로부터 위치와 밝기차이를 출력하여 픽셀단위로 밝기차이만큼 출력을 보정하여 구동하는 제 5 단계를 포함하는 것을 특징으로 한다.In order to achieve the above object, a configuration of the present invention provides a first step of measuring the brightness of an entire LCD panel in pixel units, and a second step of determining and storing positions and brightness of respective pixel units of the LCD panel. And transmitting the stored position and brightness to the main control part, and determining the location and brightness difference of the part that does not reach the desired reference value of brightness through the received location and brightness, and the location determined in the third step. And a fourth step of storing the brightness difference in the memory unit, and a fifth step of outputting the position and brightness difference from the memory unit when the LCD panel is controlled to correct and output the output by the brightness difference in units of pixels. do.

또한, 상기 픽셀단위는 1 내지 4 픽셀을 한 단위로 한 것을 특징으로 한다.In addition, the pixel unit is characterized in that 1 to 4 pixels in one unit.

이하에서는 본 발명의 바람직한 일 실시예를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail.

도 1 은 본 발명의 일 실시예에 따른 LCD 패널의 밝기 보정 방법을 구현한 장치의 블럭도이고, 도 2 는 본 발명의 실시예에 따른 LCD 패널의 밝기 보정 방법을 설명하기 위한 순서도이다.1 is a block diagram of a device implementing the brightness correction method of the LCD panel according to an embodiment of the present invention, Figure 2 is a flow chart illustrating a brightness correction method of the LCD panel according to an embodiment of the present invention.

본 발명의 실시예에 따른 LCD 패널의 밝기 보정 장치는 도 1 에 도시한 바와 같이, 영상을 디스플레이하는 패널(30), 패널(30)의 밝기를 픽셀단위로 스캔하며 측정하는 CCD 카메라(10), 패널의 측정된 픽셀단위들의 위치와 밝기를 판단한 후 저장하는 PC(20), 픽셀단위들의 위치와 밝기차이들을 저장하는 메모리부(60), 픽셀단위들의 위치와 밝기차이들을 메모리부(60)에 저장하도록 제어하고 패널구동부(40)를 제어하여 전반적인 밝기보정을 수행하도록 하는 주제어부(50)를 포함하여 이루어진다.As shown in FIG. 1, an apparatus for compensating brightness of an LCD panel according to an exemplary embodiment of the present invention includes a panel 30 displaying an image and a CCD camera 10 scanning and measuring the brightness of the panel 30 in units of pixels. The PC 20 stores the position and brightness of the measured pixel units of the panel and stores them, the memory unit 60 stores the position and brightness differences of the pixel units, and the memory unit 60 stores the position and brightness differences of the pixel units. It includes a main control unit 50 to control to store in and to control the panel driver 40 to perform the overall brightness correction.

먼저, CCD 카메라(10)는 패널(30)의 밝기인 칸델라를 도 3 에 도시한 바와 같이, 패널 화면 전체인 1366 × 768의 픽셀을 픽셀단위로 수평 스캔하면서 측정(S10)하여 그 측정치를 PC(20)로 전송한다.First, as shown in FIG. 3, the CCD camera 10 measures (S10) a horizontal scan of pixels 1366 × 768, which are the entire panel screen, in pixel units, as shown in FIG. Transfer to 20.

여기서, 1366 × 768의 픽셀은 제품에 따라 다를 수 있으며, 측정하는 픽셀 단위는 여러가지가 가능하나 바람직하게는 1 × 1 또는 2 × 2로 하는것이 보다 정확한 측정이 가능할 것이다.Here, the pixels of 1366 × 768 may vary depending on the product, and the pixel unit to be measured can be various, but preferably 1 × 1 or 2 × 2 will be more accurate.

또한, 도 3 에 도시한 것은 수평으로 스캔하는 방식으로 표현되었으나 이것은 일 실시예에 불과하고 수직으로 스캔, 또는 다른 여러가지 방법으로도 측정이 가능할 것이다.In addition, although illustrated in FIG. 3 is represented by a horizontal scan method, this is only an example and may be measured vertically or measured by various other methods.

PC(20)는 CCD 카메라(10)로부터 측정치를 전송받으면, 각각의 패널(30)의 픽셀단위들의 위치와 밝기를 판단한 후 저장한다(S20).When the PC 20 receives the measurement value from the CCD camera 10, the PC 20 determines and stores the position and brightness of the pixel units of each panel 30 (S20).

여기서, 픽셀들의 위치는 1366 × 768의 픽셀 각각의 고유의 가로, 세로의 위치값을 통하여 판단하게 되고, 밝기의 경우 측정되는 칸델라의 수치를 통해 판단하게 되며, 제품에 따라 정상적인 칸델라의 수치가 다를 수 있으나 본 발명의 일 실시예로 400칸델라를 취하기로 한다.Here, the positions of the pixels are determined by the intrinsic horizontal and vertical position values of each pixel of 1366 × 768, and the brightness is determined by the measured value of the candela, and the normal value of the candela varies depending on the product. But can be taken as an embodiment of the present invention 400 candela.

즉, CCD 카메라(10)가 각각의 위치값에 해당하는 픽셀단위의 밝기를 측정하여 전송하면, PC(20)는 CCD 카메라(10)의 스캔 위치를 파악한 후 각각의 픽셀단위의 밝기를 칸델라를 기준으로 판단하게 된다.That is, when the CCD camera 10 measures and transmits brightness of the pixel unit corresponding to each position value, the PC 20 determines the scan position of the CCD camera 10 and then measures the brightness of each pixel unit. Judging by the standard.

PC(20)는 저장한 픽셀단위들의 위치와 밝기를 주제어부(50)로 전송(S30)하고, 주제어부(50)는 전송받으면, 픽셀단위들의 위치와 밝기를 통해서 원하는 밝기의 기준치에 도달하지 못한 부분의 위치와 밝기차이를 판단한다(S40).The PC 20 transmits the stored position and brightness of the pixel units to the main control unit 50 (S30). When the main control unit 50 receives the transmission, the PC 20 does not reach the reference value of the desired brightness through the position and brightness of the pixel units. The difference between the position and the brightness of the failed portion is determined (S40).

즉, 픽셀단위의 위치를 파악한 후 각각의 픽셀단위의 밝기가 기준치인 400칸델라에 부합하는지 또는 얼마나 부족하거나 초과하는지를 판단한다.That is, after determining the position of the pixel unit, it is determined whether the brightness of each pixel unit satisfies the standard 400 candela, or how much is insufficient or exceeded.

그러면, 주제어부(50)는 판단한 것을 메모리부(60)로 전송하여 저장(S50)시 키고, 패널구동부(40)를 제어하여 패널의 밝기 보정을 수행하도록 구동시킨다.Then, the main controller 50 transmits the determined result to the memory unit 60 to store (S50) and controls the panel driver 40 to drive the brightness correction of the panel.

주제어부(50)는 제어신호를 통해서 패널구동부(40)를 구동시켜 LCD 패널 컨트롤시 메모리부(60)로부터 저장된 픽셀단위들의 위치와 밝기차이를 출력하여 픽셀단위 중에 밝기가 차이나는 위치의 픽셀단위 컨트롤시 정상적 칸델라수치인 400칸델라보다 부족한 만큼의 출력을 상승시켜 주거나, 초과되는 만큼의 출력을 낮추어줌으로써 밝기 보정(S60)을 수행한다.The main controller 50 drives the panel driver 40 through a control signal, and outputs the position and brightness difference of the pixel units stored from the memory unit 60 when controlling the LCD panel, thereby adjusting the pixel unit of the position where the brightness is different among the pixel units. In the control, brightness correction (S60) is performed by increasing the output which is insufficient than the normal candela value of 400 candela, or by lowering the output by the excess candela value.

예를 들어, 1300 × 700에 위치한 픽셀단위의 측정된 밝기가 390 칸델라라면, 패널구동부(40)는 상기의 정보를 메모리부(60)로부터 저장된 데이터를 통해서 인지하고, 해당 위치의 픽셀단위 컨트롤시 AC전압을 0V 내지 5V로 단계별로 올려서 RGB신호를 동시 보정함으로써 10칸델라만큼의 출력을 상승시켜 줌으로써 밝기를 보정하여 밝기를 균일하게 맞추어서 얼룩짐을 제거하는 것이다.For example, if the measured brightness of the pixel unit located at 1300 × 700 is 390 candela, the panel driver 40 recognizes the above information through the data stored in the memory unit 60 and controls the pixel unit of the corresponding position. By increasing the AC signal by increasing the AC voltage step by step from 0V to 5V, the output is increased by as much as 10 candelas to compensate for the brightness and uniformly adjust the brightness to remove spots.

본 발명은 도면에 도시된 일 실시예를 참고로 하여 설명되었으나, 이는 예시적인 것에 불과하며, 당해 기술이 속하는 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다.Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art. Will understand.

한편, 상기의 LCD 패널의 밝기 보정 방법은 TV에만 한정되어 적용 가능한 것이 아니라 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범주를 이탈하지 않는 범위 내에서 LCD 패널이 쓰이는 모니터, 모바일기기 등에도 적용 가능할 것이다.On the other hand, the brightness correction method of the LCD panel is not limited to the TV and can be applied to any monitor having an ordinary skill in the art without departing from the scope of the technical idea of the present invention monitor It will also be applicable to mobile devices.

이와 같이 구성되는 본 발명에 따르면, CCD 카메라를 이용하여 패널 앞면의 전체화면을 각각의 픽셀단위로 밝기를 측정하여 위치와 밝기를 데이터로 저장한 후에 원하는 밝기에 도달하지 못한 부분의 위치를 찾아낸 후 LCD 패널을 제어하는 출력부를 제어하여 원하는 밝기에 도달하지 못한 부분의 출력을 조절하여 출력하도록 함으로써, 정확한 밝기보정을 통해서 미세한 얼룩짐을 제거하고, 화면의 질적 향상을 도모할 수 있다.According to the present invention configured as described above, after measuring the brightness of the entire screen on the front panel of the panel by the pixel unit using the CCD camera, after finding the position of the part that does not reach the desired brightness after storing the position and brightness as data By controlling the output unit that controls the LCD panel to adjust the output of the portion that does not reach the desired brightness, it is possible to remove fine spots through accurate brightness correction, and improve the quality of the screen.

Claims (2)

LCD 패널의 전체의 밝기를 픽셀단위로 측정하는 제 1 단계;A first step of measuring the brightness of the entire LCD panel in units of pixels; 상기 LCD 패널의 각 픽셀단위들에 대한 위치와 밝기를 판단하여 저장하는 제 2 단계;A second step of determining and storing a position and brightness of each pixel unit of the LCD panel; 상기 저장한 위치와 밝기를 주제어부로 전송하고 주제어부는 전송받은 위치와 밝기를 통해서 원하는 밝기의 기준치에 도달하지 못한 부분의 위치와 밝기차이를 판단하는 제 3 단계;A third step of transmitting the stored position and brightness to the main control unit and determining the location and brightness difference of the part which does not reach the desired reference value of brightness through the received position and brightness; 상기 제 3 단계에서 판단한 위치와 밝기차이를 메모리부에 저장하는 제 4 단계; 및A fourth step of storing the position and brightness difference determined in the third step in a memory unit; And LCD 패널 컨트롤시 상기 메모리부로부터 위치와 밝기차이를 출력하여 픽셀단위로 밝기차이만큼 출력을 보정하여 구동하는 제 5 단계를 포함하는 것을 특징으로 하는 LCD 패널의 밝기 보정 방법.And a fifth step of outputting a position and brightness difference from the memory unit when the LCD panel is controlled, and correcting and driving the output by the brightness difference on a pixel-by-pixel basis. 제 1 항에 있어서,The method of claim 1, 상기 픽셀단위는 1 내지 4 픽셀을 한 단위로 한 것을 특징으로 하는 LCD 패널의 밝기 보정 방법.The pixel unit is a brightness correction method of the LCD panel, characterized in that 1 unit to 4 pixels.
KR1020060093783A 2006-09-26 2006-09-26 Method for brightness compensation of lcd panel KR20080028225A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9196222B2 (en) 2013-01-17 2015-11-24 Samsung Display Co., Ltd. Method of displaying an image, display apparatus performing the same, method and apparatus of calculating a correction value applied to the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9196222B2 (en) 2013-01-17 2015-11-24 Samsung Display Co., Ltd. Method of displaying an image, display apparatus performing the same, method and apparatus of calculating a correction value applied to the same

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