KR20120135657A - Apparatus and method for controlling brightness of flat display panel - Google Patents

Apparatus and method for controlling brightness of flat display panel Download PDF

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Publication number
KR20120135657A
KR20120135657A KR1020110054491A KR20110054491A KR20120135657A KR 20120135657 A KR20120135657 A KR 20120135657A KR 1020110054491 A KR1020110054491 A KR 1020110054491A KR 20110054491 A KR20110054491 A KR 20110054491A KR 20120135657 A KR20120135657 A KR 20120135657A
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KR
South Korea
Prior art keywords
luminance
compensation data
inverse compensation
display panel
pattern curve
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KR1020110054491A
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Korean (ko)
Inventor
배한주
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주식회사 오리온
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Priority to KR1020110054491A priority Critical patent/KR20120135657A/en
Publication of KR20120135657A publication Critical patent/KR20120135657A/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
    • G09G3/006—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
    • 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

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  • 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)

Abstract

The present invention relates to an apparatus and method for adjusting the brightness of a flat panel display panel, which enables to uniformize the luminance of the entire screen of the flat panel display panel.
To this end, in the present invention, when the luminance measurement unit measures a luminance value at each position using a plurality of luminance measurement sensors, the luminance deviation of the display panel is analyzed by the pattern curve generator using the luminance value measured by the luminance measurement unit. After generating the pattern curve by using the analyzed luminance deviation, and applying the inverse compensation algorithm to the pattern curve in the inverse compensation data generator to generate the inverse compensation data in pixel units, the inverse compensation data application unit inputs the data from the outside. Preferably, the inverse compensation data of a pixel unit is applied to the video signal to be output.
Accordingly, the present invention generates the inverse compensation data in units of pixels using the luminance values measured by the plurality of sensors, and then applies the inverse compensation data in units of pixels to the input image signal, thereby providing the entire screen of the flat panel display panel. The luminance with respect to can be made uniform.

Description

Apparatus and method for adjusting brightness of flat panel display panel {APPARATUS AND METHOD FOR CONTROLLING BRIGHTNESS OF FLAT DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for adjusting luminance of a flat panel display panel, and more particularly, to an apparatus and method for adjusting a luminance of a flat panel display panel to make the luminance uniform for the entire screen of the flat panel display panel.

In the case of flat panel displays such as liquid crystal displays (LCDs) and plasma display panels (PDPs), luminance of the entire screen is not uniform. For example, in the case of an LCD, there is a problem in that the rim of the screen appears dark due to the backlight. In particular, in the case of a narrow bezel LCD which is designed to have the thickness of the bezel as thin as possible, there is a problem in that luminance deviation between the center and the edge of the display panel is large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and generates inverse pixel compensation data using a luminance value measured through a plurality of sensors mounted in place in a display panel, and then inputs an input image signal. It is an object of the present invention to provide an apparatus and method for adjusting a brightness of a flat panel display panel by applying inverse pixel compensation data in units of pixels, thereby making it possible to uniformize the luminance of the entire screen of the flat panel display panel.

According to an aspect of the present invention, there is provided a luminance adjusting apparatus of a flat panel display panel, the luminance adjusting unit including a plurality of luminance measuring sensors and measuring luminance values at respective positions; A pattern curve generation unit for analyzing a luminance deviation of the display panel by using the luminance value measured by the luminance measuring unit, and then generating a pattern curve using the luminance deviation; An inverse compensation data generation unit generating inverse compensation data in units of pixels by applying an inverse compensation algorithm to the pattern curve generated by the pattern curve generation unit; It is preferable to include an inverse compensation data applying unit for applying and outputting the inverse compensation data of the pixel unit to the image signal input from the outside.

On the other hand, the brightness adjustment method of a flat panel display panel according to an embodiment of the present invention, the process of measuring the luminance value of each position using a plurality of luminance measurement sensor in the luminance measuring unit; Analyzing the luminance deviation of the display panel by the pattern curve generation unit using the measured luminance value, and then generating a pattern curve using the analyzed luminance deviation; Generating reverse compensation data in pixel units by applying an inverse compensation algorithm to the pattern curve; Preferably, the reverse compensation data applying unit includes a step of applying and outputting the reverse compensation data of the pixel unit to an image signal input from the outside.

According to the luminance adjusting device and method of the flat panel display panel of the present invention, after generating the inverse compensation data in the pixel unit by using the luminance value measured by the plurality of sensors, the inverse compensation data in the pixel unit to the input image signal By applying, the luminance of the entire screen of the flat panel display panel can be made uniform.

1 is a view schematically illustrating a configuration of a brightness adjusting device of a flat panel display panel according to an exemplary embodiment of the present disclosure.
2 is a flowchart illustrating a method of adjusting luminance of a flat panel display panel according to an exemplary embodiment of the present invention.

Hereinafter, an apparatus and method for adjusting brightness of a flat panel display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a configuration of an apparatus for adjusting luminance of a flat panel display panel according to an exemplary embodiment.

In FIG. 1, the luminance measuring unit 10 includes a plurality of luminance measuring sensors 10-1, 10-2,..., 10-n, and measures luminance values at each position, and then at each measured position. Is applied to the pattern curve generator 20.

As described above, the luminance measuring unit 10 preferably includes at least nine luminance measuring sensors 10-1, 10-2, ..., 10-n, and each luminance measuring sensor 10-1, 10-n. 2,..., 10-n) may be installed at least in one center, four corners, and four upper, lower, left, and right edges of the display panel.

The luminance measuring sensors 10-1, 10-2, ..., 10-n to be applied to the present invention are preferably selected to be sufficiently small and inexpensive, and may serve as Cds (photoconductive cell). Photodiodes, phototransistors, photothyristors, CCDs, MOS image sensors, and the like may be used, and for more accurate measurement, phototubes or photomultipliers may be used.

The luminance measuring sensors 10-1, 10-2,..., And 10-n are embedded in the display panel, and the luminance measuring sensors 10-1, 10-2,. In the case of the LCD panel, a small hole (Hole) is drilled in a support plate for supporting a BLU (Back Light Unit) inside the panel, and the luminance measuring sensors 10-1, 10-2, ..., 10-n In the case of the PDP panel, there is a method of installing a luminance measuring sensor (10-1, 10-2, ..., 10-n) in the drilling hole by drilling a small hole in the chassis base portion for supporting the panel have. Here, in the case of the PDP panel, it is necessary to apply an internal dielectric layer or the like as a transparent material so that light is transmitted to the rear side of the panel.

The pattern curve generator 20 analyzes the luminance deviation of the display panel by using the luminance values measured by the luminance measuring sensors 10-1, 10-2,..., 10-n of the luminance measuring unit 10. Then, a pattern curve is generated using the analyzed luminance deviation.

As described above, the pattern curve generation unit 20 may generate an accurate pattern curve as the number of luminance measurement sensors 10-1, 10-2, ..., 10-n increases.

The inverse compensation data generator 30 generates inverse compensation data in pixel units by applying an inverse compensation algorithm to the pattern curve generated in the pattern curve generation unit 20, and then inverse compensates the generated inverse compensation data in pixel units. The data is applied to the application unit 40.

Here, the inverse compensation data generation on a pixel-by-pixel basis is performed by lowering the weight of the signal level for the position of the high luminance on the basis of the lowest luminance.

As such, the reason for generating the inverse compensation data in the pixel unit is that the luminance cannot be arbitrarily increased due to the characteristics of the display panel.

The inverse compensation data applying unit 40 applies inverse compensation data in pixel units generated by the inverse compensation data generator 30 to an image signal input from the outside, and then displays the image signal to which the inverse compensation data is applied. Output to.

As described above, the inverse compensation data applying unit 40 performs sample measurement using a plurality of flat panel display panels of the same type, and then generates an inverse compensation algorithm by applying an inverse compensation algorithm to the average of the pattern curves obtained through several sample measurements. After storing the inverse compensation data in the pixel unit, if an image signal is input from the outside, the inverse compensation data previously stored may be applied to the input image signal and output.

2 is a flowchart illustrating a method of adjusting luminance of a flat panel display panel according to an exemplary embodiment.

First, the luminance measuring unit 10 measures a luminance value at each position by using a plurality of luminance measuring sensors 10-1, 10-2, ..., 10-n, and then measures the luminance value of each measured position. Is applied to the pattern curve generation unit 20 (S10).

After analyzing the luminance deviation of the display panel in the pattern curve generation unit 20 by using the luminance value measured by the luminance measuring unit 10 through the process S10 (S12), the pattern curve using the analyzed luminance deviation To generate (S14).

Thereafter, the inverse compensation data generator 30 generates the inverse compensation data in units of pixels by applying an inverse compensation algorithm to the pattern curve generated by the pattern curve generation unit 20 through the process S14, and then generates the generated pixels. The reverse compensation data of the unit is applied to the reverse compensation data applying unit 40 (S16).

The inverse compensation data applying unit 40 receiving the inverse compensation data in units of pixels from the inverse compensation data generation unit 30 through the process S16 may apply the inverse compensation data in units of pixels to an image signal input from the outside and output the same. (S18).

Apparatus and method for adjusting the brightness of a flat panel display panel of the present invention are not limited to the above-described embodiments and can be modified in various ways within the scope of the technical idea of the present invention.

For example, in an exemplary embodiment of the present invention, a pattern curve of the display panel is generated by measuring luminance at each position, but a pattern curve of the display panel is generated by measuring color at each position, and then reverse compensation is performed using the same. You can also generate data.

In another embodiment of the present invention, it is possible to change the luminance characteristic according to each position. That is, the left side of the display panel may be brightly adjusted and the right side may be darkly adjusted.

In addition, the color of the specific part that may appear due to the characteristics of the display panel may be corrected and changed, and compensation for a specific color according to the characteristic of the phosphor may be performed.

In addition, after measuring the brightness of a specific position using the OSD (On Screen Display), the brightness may be adjusted using the measured brightness value.

10. Luminance measuring unit, 10-1, 10-2,... , 10-n. Luminance measurement sensor,
20. A pattern curve generator, 30. Inverse compensation data generator,
40. Inverse compensation data application unit, 50. Display unit

Claims (4)

A luminance measuring unit comprising a plurality of luminance measuring sensors and measuring luminance values at respective positions;
A pattern curve generation unit for analyzing a luminance deviation of the display panel by using the luminance value measured by the luminance measuring unit, and then generating a pattern curve using the luminance deviation;
An inverse compensation data generation unit generating inverse compensation data in units of pixels by applying an inverse compensation algorithm to the pattern curve generated by the pattern curve generation unit;
And an inverse compensation data applying unit configured to apply the inverse compensation data in units of pixels to an image signal input from the outside and output the inverse compensation data.
The method of claim 1, wherein the luminance measuring unit,
An apparatus for adjusting the brightness of a flat panel display panel, characterized in that it comprises at least nine or more luminance measuring sensors.
The method of claim 1, wherein the inverse compensation data applying unit,
Inverse compensation data obtained through sample measurement using a plurality of homogeneous flat panel display panels is stored, and when an image signal is input from the outside, the inverse compensation data previously stored is applied to the input image signal and output. The brightness adjustment device of the flat panel display panel.
Measuring a luminance value of each position in the luminance measuring unit by using the plurality of luminance measuring sensors;
Analyzing the luminance deviation of the display panel by the pattern curve generation unit using the measured luminance value, and then generating a pattern curve using the analyzed luminance deviation;
Generating reverse compensation data in pixel units by applying an inverse compensation algorithm to the pattern curve;
And applying, by the inverse compensation data applying unit, the inverse compensation data in units of pixels to an image signal input from the outside.
KR1020110054491A 2011-06-07 2011-06-07 Apparatus and method for controlling brightness of flat display panel KR20120135657A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160039083A (en) * 2014-09-30 2016-04-08 엘지디스플레이 주식회사 Display device and visibility enhancement method thereof
US9685106B2 (en) 2015-01-06 2017-06-20 Samsung Display Co., Ltd. Method for compensating image distortion caused by the curvature of a display device
US9799257B2 (en) 2014-06-02 2017-10-24 Samsung Display Co., Ltd. Hierarchical prediction for pixel parameter compression
US10013912B2 (en) 2014-09-04 2018-07-03 Samsung Display Co., Ltd. Display device having a bent display part and method of driving the same
WO2020177103A1 (en) * 2019-03-06 2020-09-10 京东方科技集团股份有限公司 Display compensation method, display compensation device, display device, and storage medium
CN114255699A (en) * 2022-01-28 2022-03-29 惠州视维新技术有限公司 Display screen picture compensation method and device and display equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9799257B2 (en) 2014-06-02 2017-10-24 Samsung Display Co., Ltd. Hierarchical prediction for pixel parameter compression
US10013912B2 (en) 2014-09-04 2018-07-03 Samsung Display Co., Ltd. Display device having a bent display part and method of driving the same
KR20160039083A (en) * 2014-09-30 2016-04-08 엘지디스플레이 주식회사 Display device and visibility enhancement method thereof
US9685106B2 (en) 2015-01-06 2017-06-20 Samsung Display Co., Ltd. Method for compensating image distortion caused by the curvature of a display device
WO2020177103A1 (en) * 2019-03-06 2020-09-10 京东方科技集团股份有限公司 Display compensation method, display compensation device, display device, and storage medium
US11205376B2 (en) 2019-03-06 2021-12-21 Boe Technology Group Co., Ltd. Display compensation method, display compensation device, display device and storage medium
CN114255699A (en) * 2022-01-28 2022-03-29 惠州视维新技术有限公司 Display screen picture compensation method and device and display equipment

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