WO2018086933A1 - System and method for improving efficiency of lcd devices using a local scanning application - Google Patents

System and method for improving efficiency of lcd devices using a local scanning application Download PDF

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Publication number
WO2018086933A1
WO2018086933A1 PCT/EP2017/077759 EP2017077759W WO2018086933A1 WO 2018086933 A1 WO2018086933 A1 WO 2018086933A1 EP 2017077759 W EP2017077759 W EP 2017077759W WO 2018086933 A1 WO2018086933 A1 WO 2018086933A1
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WO
WIPO (PCT)
Prior art keywords
backlight
blocks
motion
display device
scanning
Prior art date
Application number
PCT/EP2017/077759
Other languages
French (fr)
Inventor
Mustafa Ilker Uzun
Cengiz Berkay
Osman Osman
Mehmet Emin CEPNI
Caglar Henden
Original Assignee
Arcelik Anonim Sirketi
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Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2018086933A1 publication Critical patent/WO2018086933A1/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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Definitions

  • the present invention relates to a system and method for improving efficiency of LCD devices using a local scanning application.
  • LCD devices comprise a unit providing white light (backlight) and LCD and color filters to allow white light to be filtered according to color. As the white light produced is filtered in very small segments (pixels), a high resolution picture can be obtained on the display device. Due to the structure of LCD devices, when the display content contains motion, the display device develops a motion blur problem.
  • a method to prevent this issue is scanning backlight.
  • backlight is turned on and off in sync with the frame rate of the display content.
  • backlight is static.
  • backlight is increased momentarily to provide the same screen brightness level as static backlight. The main issue here is the decrease in efficiency due to momentary increases of backlight.
  • Luminescence increases with increasing current across LEDs and additionally the forward voltage across the LED also increases greatly. For example, when the backlight luminescence of LEDs running statically at 180 mA is doubled due do scanning backlight, the power consumption of backlight increases 2.5-fold. Considering that in scanning backlight applications the LEDs are turned on 50% of the time and tuned of 50% of the time, it is determined that the same backlight luminescence is achieved with 25% more power consumption when using scanning backlight. This increase in power consumption causes inefficiency.
  • US9087485 discloses a local dimming driving system and method of an LCD device, which is capable of preventing color distortion due to gray scale saturation when data is compensated while enabling local dimming.
  • the method comprises the steps of: detecting the maximum values per pixel from input image data; analyzing the maximum values per pixel for each block and determining local dimming values according to the results; calculating a first gain value using the local dimming values per block; calculating a maximum gain value per pixel using the maximum value per pixel as a second gain value and selecting the smaller value of the first and second gain values as a final gain value; compensating the input image data using the final gain value; and controlling the luminance of a backlight unit using the local dimming value per block.
  • US2008106544 discloses a motion detection method and an apparatus applied to a liquid crystal display device. The method utilizes the steps of storing a first frame image in a storage unit at a first time, receiving the first frame image and a second frame image which is received at a second time, calculating a difference value of each pixel between the first frame image and the second frame image, and determining an adjustment value and a variance between the first frame image and the second frame image according to the result of the difference value of each pixel between the first frame image and the second frame image.
  • the present invention addresses the situation where the increased power consumption and inefficiency caused by scanning backlight is reduced without producing motion blur on the TV display. As power consumption is decreased, the lifetime of LEDs used for backlight will increase.
  • the present invention provides a system and method for improving efficiency of LCD devices using a local scanning application, as provided by the characterizing features as defined in Claim 1.
  • Primary object of the present invention is to provide a system and method for improving efficiency of LCD devices using a local scanning application.
  • the display is divided into blocks and scanning backlight is only turned on for blocks of the display that are selected as blocks with motion and static backlight is used for the remaining stationary blocks.
  • Fig. 1 demonstrates a simplified general representation of different components in a conventional LCD system with backlight, liquid crystal layer, RGB color filters and screen according to the present invention.
  • Fig. 2 demonstrates a general schematic view of an LCD panel comprising a plurality of screen segments in the form of backlight blocks according to the present invention.
  • Fig. 3 demonstrates a general schematic view of the components according to the implementation of the present invention.
  • Fig. 4 demonstrates a general flow diagram of the implementation according to the present invention.
  • the present invention proposes a local scanning backlight system and method to reduce power consumption and improve the efficiency of LCD image display devices.
  • the display is divided into backlight sections.
  • Fig. 2 illustrates a backlight structure divided into 25 sections.
  • a different LED unit as well as LED driver unit is used for each backlight section.
  • the video stream displayed on the screen is processed by the TV processor, i.e. the electronic control unit and the motion value of the display is calculated for each backlight block based on the processor data.
  • a motion threshold value is defined to evaluate the motion value of the displays in each backlight block.
  • Motion estimation is the process of determining motion vectors in adjacent frames in a video sequence in the form of transformation from one 2D image to another. According to this embodiment, blocks with a defined motion value below a predetermined motion threshold value are deemed to be stationary blocks.
  • the present invention advantageously provides that the scanning backlight is turned off for stationary blocks. As the displayed content in the block in question is not mobile one, deactivating the scanning backlight for the specific display unit has no adverse effect on the picture quality.
  • Block-matching algorithm typically serves to the purpose of motion estimation by locating those matching macroblocks in a sequence of digital video frames.
  • scanning backlight will only be turned on for blocks with motion and only for the duration of motion. For the remaining blocks, backlight will be static. Therefore, the negative effect of scanning backlight on power consumption is eliminated.
  • an image display device receiving a plurality of broadcast program contents, said image display device comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system turned on and off in sync with the frame rate of the display content.
  • said scanning backlight system comprises a plurality of backlight blocks, each with separate LED driver units driving associated LED units.
  • said electronic control unit is configured to calculate the motion value of the display for each backlight block of said scanning backlight system and compare said motion value with a predetermined motion threshold value.
  • said electronic control unit is configured to define backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turn off scanning backlight for said stationary blocks.
  • said electronic control unit is configured to define backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turn on scanning backlight for said non-stationary blocks to improve picture quality.
  • motion estimation is carried out by means of block-matching, phase correlation and frequency domain, pixel recursive or optical flow algorithms.
  • scanning backlight is turned on for backlight blocks with motion only for the duration of said motion while for the remaining backlight blocks, backlight is static.
  • said scanning backlight system is divided into at least 25 backlight blocks.
  • a method for operating an image display device comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system with a plurality of backlight blocks, each with separate LED driver units driving associated LED units turned on and off in sync with the frame rate of the display content
  • said method of operating said image display device comprises the steps of: a) calculating the motion value of the display for each backlight block of said scanning backlight system and comparing said motion value with a predetermined motion threshold value, b) defining backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turning off scanning backlight for said stationary blocks and, c) defining backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turning on scanning backlight for said non-stationary blocks.
  • the present invention advantageously provides that increased power consumption and inefficiency caused by scanning backlight is reduced without producing motion blur on the TV display.

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

Abstract

The present invention relates to a system and method for improving efficiency of LCD devices using a local scanning application. The present invention more particularly relates to an image display device receiving a plurality of broadcast program contents, said image display device comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system turned on and off in sync with the frame rate of the display content.

Description

SYSTEM AND METHOD FOR IMPROVING EFFICIENCY OF LCD DEVICES USING A LOCAL SCANNING APPLICATION
The present invention relates to a system and method for improving efficiency of LCD devices using a local scanning application.
It is well-known that LCD devices comprise a unit providing white light (backlight) and LCD and color filters to allow white light to be filtered according to color. As the white light produced is filtered in very small segments (pixels), a high resolution picture can be obtained on the display device. Due to the structure of LCD devices, when the display content contains motion, the display device develops a motion blur problem.
A method to prevent this issue is scanning backlight. In this method, backlight is turned on and off in sync with the frame rate of the display content. In standard products where this method is not utilized, backlight is static. In the scanning backlight method, backlight is increased momentarily to provide the same screen brightness level as static backlight. The main issue here is the decrease in efficiency due to momentary increases of backlight.
Luminescence increases with increasing current across LEDs and additionally the forward voltage across the LED also increases greatly. For example, when the backlight luminescence of LEDs running statically at 180 mA is doubled due do scanning backlight, the power consumption of backlight increases 2.5-fold. Considering that in scanning backlight applications the LEDs are turned on 50% of the time and tuned of 50% of the time, it is determined that the same backlight luminescence is achieved with 25% more power consumption when using scanning backlight. This increase in power consumption causes inefficiency.
Among others, a prior art publication in the technical field of the invention may be referred to as US9087485, which discloses a local dimming driving system and method of an LCD device, which is capable of preventing color distortion due to gray scale saturation when data is compensated while enabling local dimming. The method comprises the steps of: detecting the maximum values per pixel from input image data; analyzing the maximum values per pixel for each block and determining local dimming values according to the results; calculating a first gain value using the local dimming values per block; calculating a maximum gain value per pixel using the maximum value per pixel as a second gain value and selecting the smaller value of the first and second gain values as a final gain value; compensating the input image data using the final gain value; and controlling the luminance of a backlight unit using the local dimming value per block.
Another example may be referred to as US2008106544. US2008106544 discloses a motion detection method and an apparatus applied to a liquid crystal display device. The method utilizes the steps of storing a first frame image in a storage unit at a first time, receiving the first frame image and a second frame image which is received at a second time, calculating a difference value of each pixel between the first frame image and the second frame image, and determining an adjustment value and a variance between the first frame image and the second frame image according to the result of the difference value of each pixel between the first frame image and the second frame image.
The present invention, on the other hand, addresses the situation where the increased power consumption and inefficiency caused by scanning backlight is reduced without producing motion blur on the TV display. As power consumption is decreased, the lifetime of LEDs used for backlight will increase.
The present invention provides a system and method for improving efficiency of LCD devices using a local scanning application, as provided by the characterizing features as defined in Claim 1.
Primary object of the present invention is to provide a system and method for improving efficiency of LCD devices using a local scanning application.
According to the local scanning application of the present invention, the display is divided into blocks and scanning backlight is only turned on for blocks of the display that are selected as blocks with motion and static backlight is used for the remaining stationary blocks.
Accompanying drawings are given solely for the purpose of exemplifying an image display device, whose advantages over prior art were outlined above and will be explained in brief hereinafter.
The drawings are not meant to delimit the scope of protection as identified in the Claims, nor should they be referred to alone in an effort to interpret the scope identified in said Claims without recourse to the technical disclosure in the description of the present invention.
Fig. 1 demonstrates a simplified general representation of different components in a conventional LCD system with backlight, liquid crystal layer, RGB color filters and screen according to the present invention.
Fig. 2 demonstrates a general schematic view of an LCD panel comprising a plurality of screen segments in the form of backlight blocks according to the present invention.
Fig. 3 demonstrates a general schematic view of the components according to the implementation of the present invention.
Fig. 4 demonstrates a general flow diagram of the implementation according to the present invention.
The present invention proposes a local scanning backlight system and method to reduce power consumption and improve the efficiency of LCD image display devices. In this method, the display is divided into backlight sections. As an exemplary embodiment, Fig. 2 illustrates a backlight structure divided into 25 sections.
According to the present invention, a different LED unit as well as LED driver unit is used for each backlight section. The video stream displayed on the screen is processed by the TV processor, i.e. the electronic control unit and the motion value of the display is calculated for each backlight block based on the processor data.
In the preferred embodiment of the present invention, a motion threshold value is defined to evaluate the motion value of the displays in each backlight block. Motion estimation is the process of determining motion vectors in adjacent frames in a video sequence in the form of transformation from one 2D image to another. According to this embodiment, blocks with a defined motion value below a predetermined motion threshold value are deemed to be stationary blocks.
In order to lower the energy consumption, the present invention advantageously provides that the scanning backlight is turned off for stationary blocks. As the displayed content in the block in question is not mobile one, deactivating the scanning backlight for the specific display unit has no adverse effect on the picture quality.
On the other hand, in contrast to the situation explained above, if the motion value of a specific block is found to be above the motion threshold, scanning backlight is turned on in that block to improve picture quality. According to the present invention, different methods such as block-matching algorithm, phase correlation and frequency domain methods, pixel recursive algorithm and optical flow, may be used to determine the motion value of a block.
Block-matching algorithm typically serves to the purpose of motion estimation by locating those matching macroblocks in a sequence of digital video frames.
It is to be noted that the number and arrangement of block in a system may be different than the example given in Fig. 2. For the method disclosed herein, scanning backlight will only be turned on for blocks with motion and only for the duration of motion. For the remaining blocks, backlight will be static. Therefore, the negative effect of scanning backlight on power consumption is eliminated.
In one embodiment of the present invention, an image display device is proposed, receiving a plurality of broadcast program contents, said image display device comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system turned on and off in sync with the frame rate of the display content.
In a further embodiment of the present invention, said scanning backlight system comprises a plurality of backlight blocks, each with separate LED driver units driving associated LED units.
In a further embodiment of the present invention, said electronic control unit is configured to calculate the motion value of the display for each backlight block of said scanning backlight system and compare said motion value with a predetermined motion threshold value.
In a further embodiment of the present invention, said electronic control unit is configured to define backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turn off scanning backlight for said stationary blocks.
In a further embodiment of the present invention, said electronic control unit is configured to define backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turn on scanning backlight for said non-stationary blocks to improve picture quality.
In a further embodiment of the present invention, motion estimation is carried out by means of block-matching, phase correlation and frequency domain, pixel recursive or optical flow algorithms.
In a further embodiment of the present invention, scanning backlight is turned on for backlight blocks with motion only for the duration of said motion while for the remaining backlight blocks, backlight is static.
In a further embodiment of the present invention, said scanning backlight system is divided into at least 25 backlight blocks.
In a further embodiment of the present invention, a method for operating an image display device is proposed, said image display device receiving a plurality of broadcast program contents and comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system with a plurality of backlight blocks, each with separate LED driver units driving associated LED units turned on and off in sync with the frame rate of the display content, said method of operating said image display device comprises the steps of: a) calculating the motion value of the display for each backlight block of said scanning backlight system and comparing said motion value with a predetermined motion threshold value, b) defining backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turning off scanning backlight for said stationary blocks and, c) defining backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turning on scanning backlight for said non-stationary blocks.
Therefore, the present invention advantageously provides that increased power consumption and inefficiency caused by scanning backlight is reduced without producing motion blur on the TV display.

Claims (5)

  1. An image display device receiving a plurality of broadcast program contents, said image display device comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system turned on and off in sync with the frame rate of a display content characterized in that;
    said scanning backlight system comprises a plurality of backlight blocks, each with separate LED driver units driving associated LED units,
    said electronic control unit is configured to calculate the motion value of the display for each backlight block of said scanning backlight system and compare said motion value with a predetermined motion threshold value,
    said electronic control unit is configured to define backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turn off scanning backlight for said stationary blocks and,
    said electronic control unit is configured to define backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turn on scanning backlight for said non-stationary blocks to improve picture quality.
  2. An image display device as in Claim 1, characterized in that motion estimation is carried out by means of block-matching, phase correlation and frequency domain, pixel recursive or optical flow algorithms.
  3. An image display device as in Claim 1 or 2, characterized in that scanning backlight is turned on for backlight blocks with motion only for the duration of said motion while backlight is static for the remaining backlight blocks.
  4. An image display device as in any preceding Claim, characterized in that said scanning backlight system is divided into at least 25 backlight blocks.
  5. A method for operating an image display device, said image display device receiving a plurality of broadcast program contents and comprising a display panel, electronic control unit for effectuating operation thereof and a scanning backlight system with a plurality of backlight blocks, each with separate LED driver units driving associated LED units turned on and off in sync with the frame rate of the display content, said method of operating said image display device comprises the steps of:
    a) calculating the motion value of the display for each backlight block of said scanning backlight system and comparing said motion value with a predetermined motion threshold value,
    b) defining backlight blocks with a motion value below said predetermined motion threshold value as stationary blocks and turning off scanning backlight for said stationary blocks and,
    c) defining backlight blocks with a motion value above said predetermined motion threshold value as non-stationary blocks and turning on scanning backlight for said non-stationary blocks.
PCT/EP2017/077759 2016-11-08 2017-10-30 System and method for improving efficiency of lcd devices using a local scanning application WO2018086933A1 (en)

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TRA2016/15950 2016-11-08
TR2016/15950A TR201615950A1 (en) 2016-11-08 2016-11-08 System and method for improving efficiency of lcd devi̇ces using a local scanning application

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006040737A1 (en) * 2004-10-14 2006-04-20 Koninklijke Philips Electronics N.V. Display apparatus
US20080106544A1 (en) 2006-11-03 2008-05-08 Chi Mei Optoelectronics Corp. Motion detection apparatus and method applied to liquid crystal display device
US20080297464A1 (en) * 2007-05-31 2008-12-04 Kabushiki Kaisha Toshiba Display device and display method
US9087485B2 (en) 2009-12-11 2015-07-21 Lg Display Co., Ltd. Local dimming driving method and device of liquid crystal display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006040737A1 (en) * 2004-10-14 2006-04-20 Koninklijke Philips Electronics N.V. Display apparatus
US20080106544A1 (en) 2006-11-03 2008-05-08 Chi Mei Optoelectronics Corp. Motion detection apparatus and method applied to liquid crystal display device
US20080297464A1 (en) * 2007-05-31 2008-12-04 Kabushiki Kaisha Toshiba Display device and display method
US9087485B2 (en) 2009-12-11 2015-07-21 Lg Display Co., Ltd. Local dimming driving method and device of liquid crystal display device

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