KR20120135946A - Large display apparatus and method for brightness control thereof - Google Patents

Large display apparatus and method for brightness control thereof Download PDF

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Publication number
KR20120135946A
KR20120135946A KR1020110054855A KR20110054855A KR20120135946A KR 20120135946 A KR20120135946 A KR 20120135946A KR 1020110054855 A KR1020110054855 A KR 1020110054855A KR 20110054855 A KR20110054855 A KR 20110054855A KR 20120135946 A KR20120135946 A KR 20120135946A
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KR
South Korea
Prior art keywords
luminance
unit
value
brightness
measured
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KR1020110054855A
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Korean (ko)
Inventor
배한주
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주식회사 오리온
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Priority to KR1020110054855A priority Critical patent/KR20120135946A/en
Publication of KR20120135946A publication Critical patent/KR20120135946A/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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: A large display device and a brightness control method thereof are provided to improve screen quality by preventing the brightness deviation between unit panels. CONSTITUTION: A multi display panel(100) is composed of adjacent unit panels. Light measuring sensors(SR1,SR2,SR3,SR4) are respectively installed in the unit panel. The light measuring sensor measures brightness. A brightness compensation operation processor(110) compares the measured brightness values. The brightness compensation processor controls the brightness of the unit panels by calculating brightness control information. [Reference numerals] (110) Brightness compensation operation processor; (111) Light signal processor; (112) Reference brightness setting part; (113) Brightness controller

Description

LARGE DISPLAY APPARATUS AND METHOD FOR BRIGHTNESS CONTROL THEREOF}

The present invention relates to a large display device and a brightness control method thereof, and more particularly, to a large display device including a plurality of unit panels and a brightness control method thereof.

Today's display panels are dominated by flat panel displays such as plasma display panels (PDPs), liquid crystal displays (LCDs), and organic light emitting diodes (OLEDs).

In addition, since one display panel has a limitation on the screen size, in order to display a large screen by expanding the size of the screen area, it is recommended to construct a large display device by continuously arranging and combining unit panels of a certain size in up, down, left, and right directions. It is common.

When a large display device is configured in such a manner that a plurality of unit panels are connected to each other to form a large screen, luminance deviations occur between the unit panels. It affects the characteristics such as temperature.

In particular, when implementing a large display device, each unit panel does not have the same luminance uniformity, and thus, even if all the unit panels have the same luminance setting value, each unit panel may display different luminance. For example, when the luminance setting value of '50' is given to the first unit panel and the luminance setting value of '50' is also given to the second unit panel, when the luminance of the two unit panels is actually measured, different luminance values are obtained. Indicates.

1 is a diagram illustrating an example of luminance deviation of a large display device. (a) is a normal display state before the luminance deviation occurs, and (b) illustrates a state where the luminance decrease occurs in the unit panel on the upper right side.

Conventionally, in order to solve the luminance deviation between unit panels, the user may determine the luminance deviation of the screen by time, or readjust the luminance of each unit panel by external luminance measuring equipment at the upper part of the screen to readjust the luminance. To do the job.

However, it is incorrect to determine whether or not a luminance deviation has occurred depending on time. In addition, when the external equipment is used for the luminance measurement, it is necessary to mobilize additional expensive equipment, and the measurement is complicated and the process for readjusting the luminance is difficult. In other words, it is difficult to perform the brightness adjustment immediately and frequently because it requires complicated processes and equipment, and it is impossible in reality for the general user to adjust the brightness deviation one by one.

The present invention has been proposed to solve the problems of the prior art as described above, the object of which is to improve the screen quality by solving the luminance deviation between the expected unit panel when implementing a large display device using unit panels The present invention provides a large display device and a brightness control method thereof.

A large display device according to the present invention includes a multi display panel composed of unit panels connected to each other; Optical measuring sensors installed in each of the unit panels to measure luminance; And comparing the measured luminance values obtained by the photometric sensors with each other, calculating luminance adjustment information for compensating for the luminance deviation between the unit panels according to a comparison result, and then calculating the luminance adjustment information based on the calculated luminance adjustment information. And a luminance compensation calculating processor for controlling the luminance of the unit panels.

On the other hand, the brightness control method of a large display device according to the present invention is a brightness control method of a large display device including unit panels connected to each other, the large display device by the optical measuring sensors installed in each of the unit panels Obtaining and collecting measured luminance values; Selecting a reference luminance value by comparing the luminance deviation between the unit panels by using the measured luminance values collected by the large display device; And controlling the luminance of the target panel according to the luminance adjustment information calculated by calculating the luminance adjustment information of the target panel among the unit panels according to the selected reference luminance value.

According to the present invention, the screen quality may be improved by solving the luminance deviation that may appear when the multi-display is implemented.

In other words, it is possible to measure and control the luminance value in real time through the optical measuring sensor inside the unit panel, so that no external equipment is required, and the measurement and control of the luminance are automatically performed to improve the convenience of use. Inconsistency in display properties such as luminance uniformity, color uniformity, and color temperature in the entire screen of the display device can be prevented.

1 is a diagram illustrating an example of luminance deviation of a large display device.
2 is a block diagram of a large display device according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an installation form of an optical measuring sensor in the large display device of FIG. 1.
4 is a flowchart illustrating a brightness control method of a large display device according to an exemplary embodiment of the present invention.

Hereinafter, a large display device and a brightness control method thereof according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a large display device according to an embodiment of the present invention.

Referring to FIG. 2, a large display device according to an exemplary embodiment of the present invention includes a plurality of unit panels connected to each other (DP1, DP2, DP3, DP4, hereinafter referred to as DP when no distinction is necessary). Optical measuring sensors SR1, SR2, SR3, SR4 installed inside each of the panel 100 and the unit panels DP1, DP2, DP3, and DP4 to measure actual luminance. And a luminance compensation operation processor 110 for compensating for luminance uniformity between the unit panels DP constituting the large screen to implement luminance uniformity.

The large display device according to an exemplary embodiment includes a photo measuring sensor SR for measuring actual luminance in each unit panel DP, and measures the luminance of each unit panel DP continuously or at predetermined intervals. The luminance compensation calculation processing unit 110 collects the data and compares the respective data to compensate for the luminance deviation according to the luminance control algorithm.

The multi display panel 100 is a structure that implements a large screen by arranging the plurality of unit panels DP to be adjacent to each other in up, down, left and right. For example, each unit panel DP may be a flat panel display such as a PDP panel, an LCD panel, or an OLED panel.

Basically, each unit panel DP exhibits a constant luminance in response to a given luminance setting value. For example, when the luminance setting value is set to '50' in a specific unit panel DP, the panel displays the luminance of '400 cd / m 2'.

As a method of measuring luminance using the optical measuring sensor SR, a method of measuring and controlling luminance in real time by continuously performing measurement simultaneously with driving of the unit panel DP, and measuring / controlling at predetermined time intervals. For example, there may be a method of measuring and controlling luminance by setting a specific time.

The luminance compensation operation processor 110 collects the measured luminance values obtained by the luminance measurement of each optical measuring sensor SR installed in the unit panels DP, compares them, and compares the unit panels DP according to the comparison result. After calculating luminance adjustment information for compensating the luminance deviation between the plurality of panels, the luminance of the unit panels DP is controlled based on the calculated luminance adjustment information.

In this case, the luminance compensation operation processor 110 converts an analog value of the luminance measured by the photometric sensors SR into a digital value to the optical signal processor 111 and the optical signal processor 111 to obtain measured luminance values. Among the unit panels DP in accordance with the reference luminance value selected by the reference luminance setting unit 112 and the reference luminance setting unit 112 to select the reference luminance value by comparing the measured luminance values of the unit panels DP obtained by each other. In order to control the brightness of the target panel, a brightness adjustment performing unit 113 for calculating the brightness adjustment information of the target panel.

The luminance compensation operation processor 110 controls the luminance deviation between the unit panels DP on the entire screen by performing an operation for compensating for the luminance deviation using the luminance control algorithm, and the luminance control algorithm mounted thereon. May be variously implemented according to the embodiment.

For example, the luminance compensating processor 110 determines a panel having the lowest luminance among the unit panels DP, and adjusts the luminance setting values of the remaining panels to display the same luminance as the measured luminance value of the corresponding panel, or to display the highest luminance. After determining the panel representing the luminance, the luminance setting values of the remaining panels may be adjusted to display the same luminance as the measured luminance value of the panel. In addition, there may be a method of adjusting the luminance setting values of the entire unit panels DP to calculate an average value from the measured luminance values of the unit panels DP to represent the average value.

In this way, all of the unit panels DP constituting the multi display panel 100 may be target panels to perform luminance compensation, and only some of them may be target panels depending on how the reference luminance value is selected. .

The luminance adjustment performing unit 113 of the luminance compensation operation processor 110 collects the measured luminance values received through the photometric sensor SR of the target panel for a predetermined time or periodically, so as to measure the measured luminance values of the target panel. The luminance adjustment may be continuously performed several times until the luminance coincides with the reference luminance value determined by the reference luminance setting unit 112.

An exemplary process of luminance compensation will be described below.

First, although the same luminance setting value is set in all of the unit panels DP, the actual luminance of each unit panel DP may be different.

For example, although the luminance setting value '50' is set to be the same in all the unit panels DP, the actual luminance of the first unit panel DP1 represents '300 cd / m 2', and the second to third unit panels ( Assume that the actual luminance of DP1, DP2, DP3, DP4) represents '400 cd / m 2'.

In this case, the luminance compensation operation processor 110 determines '400 cd / m 2' as the reference luminance value, and in order to achieve the luminance of '400 cd / m 2' in the first unit panel DP1, After calculating luminance adjustment information on how to adjust the luminance setting value, the actual luminance of the first unit panel DP1 is adjusted accordingly. For example, the luminance compensation operation processor 110 changes the luminance setting value from '50' to '52' in order to compensate for the luminance offset (-100) of the first unit panel DP1 that is the target panel. ), So that the luminance measurement value, i.e., the actual luminance, exactly matches the reference luminance value.

Even when the luminance setting value is adjusted through calculation to compensate for the luminance deviation, there is a case where the actual luminance displayed on the target panel is not displayed as a desired value. In order to prevent this, one embodiment may adjust the luminance several times in succession to accurately compare the measured luminance value and the reference luminance value several times to accurately generate the desired actual luminance.

Meanwhile, a method of adjusting the luminance by the luminance compensation operation processor 110 may be presented in various ways according to the embodiment.

For example, when the unit panel DP is an LCD panel, the luminance compensating processor 110 adjusts a voltage, a current, a frequency, etc., or changes an input image signal value supplied to the BLU so that the light emission amount of the BLU embedded in the LCD panel is adjusted. Thus, desired luminance can be achieved. When the unit panel DP is a PDP panel, desired luminance can be achieved by controlling the number of sustain pulses supplied to the PDP panel.

FIG. 3 is a diagram illustrating an installation form of an optical measuring sensor in the large display device of FIG. 1.

Referring to FIG. 3, each unit panel DP constituting a large screen of the multi display panel 100 includes a display unit 101 for displaying a screen, a rear support unit 102 for enclosing and supporting the rear of the display unit 101 as a whole. The small hole 103 formed to penetrate a portion of the rear support part 102 is inserted into the rear support part 102 through the small hole 103 to transmit the light transmitted to the rear surface of the display unit 101. It includes an optical measuring sensor (SR) for sensing.

The photometric sensor SR for luminance measurement is built in the unit panel DP.

For example, when each unit panel DP constituting the multi display panel 100 is an LCD panel, a small hole is drilled in a supporting plate supporting a BLU (Back Light Unit) inside the panel, and a photometric sensor is mounted in the punched hole. Install it. When the unit panel DP is a PDP panel, a small hole is drilled in the chassis base portion that supports the panel, and an optical measuring sensor is installed in the drilled hole. In this case, it is necessary to apply an internal dielectric layer or the like as a transparent material so that light is transmitted from the inside of the panel to the back side.

The photometric sensor SR used here is selected to be able to perform a sufficient role as a compact and inexpensive device. For example, a photoconductive cell (Cds), a photodiode, a phototransistor, a photo thyristor, a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS) image sensor, and the like may be applied. When the photoelectric sensor or the photomultiplier tube is used as the optical measuring sensor SR, more accurate measurement can be realized. These devices are inexpensive, very small (within 1 cm in diameter) and excellent in sensitivity, making them suitable for use in photometric sensors (SR).

The above-described luminance compensation calculation processing unit 110 converts the analog values measured by the photometric sensor SR into digital values, collects them, and utilizes them in the subsequent luminance control after the calculation process.

The photoelectric sensor SR inside and the small hole 103 at the rear side for mounting the same may implement various numbers, shapes, positions, installation methods, and the like, according to embodiments.

4 is a flowchart illustrating a brightness control method of a large display device according to an exemplary embodiment of the present invention.

First, the luminance compensating processor 110 of the large display device measures the luminance of the entire unit panels DP by using the photometric sensors SR installed inside each of the unit panels DP constituting the multi display panel 100. Obtain the values and collect them (S110).

Thereafter, the luminance compensation operation processor 110 compares the luminance deviation between the unit panels DP by using the collected measured luminance values (S120) and selects a reference luminance value (S130).

Thereafter, the luminance compensation operation processor 110 calculates luminance adjustment information of the target panel among the unit panels DP based on the selected reference luminance value, and controls the luminance of the target panel according to the calculated luminance adjustment information (S140). ).

In this case, the luminance compensation operation processor 110 may continuously perform luminance adjustment a plurality of times until the measured luminance value of the target panel, that is, the actual luminance matches the reference luminance value determined in S130.

In this case, the luminance compensation operation processor 110 adjusts the luminance of the target panel according to the luminance adjustment information, and then compares the measured luminance values of the corresponding panel, which are obtained through the optical measuring sensor SR, with the reference luminance value again, and then the actual luminance of the target panel. The luminance adjustment is repeated several times until the luminance coincides with the reference luminance value (S150 and S160).

The luminance compensation operation processor 110 determines the average value of the measured luminance values collected from the unit panels DP, the lowest value among the measured luminance values, the highest value among the measured luminance values, and the like as the reference luminance values. By controlling the luminance of the unit panels DP, the luminance deviation between the panels can be compensated.

As such, one embodiment compares and evaluates measured values of real-time luminance of each unit panel when realizing a large display device in order to solve the luminance deviation between unit panels DP. The overall unit panels DP are adjusted to uniform luminance. In this case, by adjusting the luminance several times, the luminance error that may appear in each unit panel DP may be minimized to achieve more accurate luminance uniformity in a large display device.

The configuration of a large display device and a method for controlling brightness thereof according to the present invention is not limited to the above-described embodiments, and various modifications such as characteristics of the display element and environment of use of the display device can be made within the scope of the technical idea of the present invention. It can be carried out.

100: multi display panel
DP: module panel
SR: photometer
110: luminance compensation processing unit

Claims (8)

A multi display panel composed of unit panels connected to each other;
Optical measuring sensors installed in each of the unit panels to measure luminance; And
The measured luminance values obtained by the photometric sensors are collected and compared with each other, and after calculating luminance adjustment information for compensating for the luminance deviation between the unit panels according to the comparison result, the unit is based on the calculated luminance adjustment information. A large display device including a luminance compensation calculating processor for controlling luminance of panels.
The method of claim 1, wherein each of the unit panels,
A display section;
A rear support part which completely surrounds and supports the rear surface of the display unit;
A small hole formed to penetrate a portion of the rear support part; And
And a photometric sensor inserted into the rear support part through the small hole to sense light transmitted to the rear surface of the display part.
The method of claim 1, wherein the luminance compensation calculation processing unit,
An optical signal processor for converting analog values of luminance measured by the photometric sensors into digital values to obtain measured luminance values;
A reference luminance setting unit which selects a reference luminance value by comparing the measured luminance values obtained by the optical signal processing unit with each other; And
And a luminance adjustment performing unit configured to calculate luminance adjustment information of the target panel to control the luminance of the target panel among the unit panels according to the reference luminance value selected by the reference luminance setting unit.
The method of claim 3, wherein the brightness adjustment performing unit,
And adjusting the luminance plural times in succession until the measured luminance value of the target panel coincides with the reference luminance value.
The method of claim 1, wherein the luminance compensation calculation processing unit,
Luminance of the target panel among the unit panels using any one of an average value of the measured luminance values collected from the unit panels, the lowest value of the measured luminance values, and the highest value of the measured luminance values as a reference luminance value. Large display device, characterized in that for adjusting the.
In the brightness control method of a large display device including unit panels connected to each other,
Acquiring and collecting measured luminance values by photometric sensors installed inside each of the unit panels by the large display device;
Selecting a reference luminance value by comparing the luminance deviation between the unit panels by using the measured luminance values collected by the large display device; And
And controlling the luminance of the target panel according to the luminance adjustment information calculated by the luminance display information of the target panel among the unit panels according to the selected reference luminance value. Way.
The method according to claim 6,
The large display device is a brightness control method of a large display device, characterized in that the brightness adjustment is continuously performed a plurality of times until the measured brightness value of the target panel coincides with the reference brightness value.
The method according to claim 6,
The large display device may be configured as a reference luminance value based on one of an average value of measured luminance values collected from the unit panels, a lowest value of the measured luminance values, and a highest value of the measured luminance values. A brightness control method of a large display device, characterized in that for adjusting the brightness.
KR1020110054855A 2011-06-08 2011-06-08 Large display apparatus and method for brightness control thereof KR20120135946A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9529561B2 (en) 2013-12-30 2016-12-27 Samsung Display Co., Ltd. Display device, multi-display device including the same, and method for driving the same
KR20170117758A (en) * 2016-04-14 2017-10-24 엘지디스플레이 주식회사 Multivision System And the Method of Driving Thereof
KR20180055541A (en) * 2016-11-17 2018-05-25 엘지전자 주식회사 Display apparatus
KR101866771B1 (en) 2017-05-29 2018-06-18 주식회사 빅킴 Barge display system
KR20190081809A (en) * 2017-12-29 2019-07-09 엘지디스플레이 주식회사 Tiled display and luminance compensation method thereof
US10430142B2 (en) 2016-08-03 2019-10-01 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
WO2020004704A1 (en) * 2018-06-28 2020-01-02 주식회사 사피엔반도체 Display device and method for controlling brightness of same
US11386832B1 (en) 2021-01-08 2022-07-12 Samsung Display Co., Ltd. Tiled display device having a plurality of display panels
CN118335037A (en) * 2024-06-11 2024-07-12 华侨大学 Brightness adjusting method and device for display panel

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9529561B2 (en) 2013-12-30 2016-12-27 Samsung Display Co., Ltd. Display device, multi-display device including the same, and method for driving the same
KR20170117758A (en) * 2016-04-14 2017-10-24 엘지디스플레이 주식회사 Multivision System And the Method of Driving Thereof
US10430142B2 (en) 2016-08-03 2019-10-01 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
US10719288B2 (en) 2016-08-03 2020-07-21 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
KR20180055541A (en) * 2016-11-17 2018-05-25 엘지전자 주식회사 Display apparatus
KR101866771B1 (en) 2017-05-29 2018-06-18 주식회사 빅킴 Barge display system
KR20190081809A (en) * 2017-12-29 2019-07-09 엘지디스플레이 주식회사 Tiled display and luminance compensation method thereof
WO2020004704A1 (en) * 2018-06-28 2020-01-02 주식회사 사피엔반도체 Display device and method for controlling brightness of same
US11270665B2 (en) 2018-06-28 2022-03-08 Sapien Semiconductors Inc. Display device and method for controlling brightness of same
US11386832B1 (en) 2021-01-08 2022-07-12 Samsung Display Co., Ltd. Tiled display device having a plurality of display panels
CN118335037A (en) * 2024-06-11 2024-07-12 华侨大学 Brightness adjusting method and device for display panel

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