US20170219764A1 - Side-edge backlight module having non-uniformly sized backlight sections and design method thereof - Google Patents

Side-edge backlight module having non-uniformly sized backlight sections and design method thereof Download PDF

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Publication number
US20170219764A1
US20170219764A1 US15/488,450 US201715488450A US2017219764A1 US 20170219764 A1 US20170219764 A1 US 20170219764A1 US 201715488450 A US201715488450 A US 201715488450A US 2017219764 A1 US2017219764 A1 US 2017219764A1
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Prior art keywords
backlight
sections
edge
section
backlight sections
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Abandoned
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US15/488,450
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English (en)
Inventor
Kuangyao Chang
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority claimed from US13/698,039 external-priority patent/US9684121B2/en
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Priority to US15/488,450 priority Critical patent/US20170219764A1/en
Assigned to SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD reassignment SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, KUANGYAO
Publication of US20170219764A1 publication Critical patent/US20170219764A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G02B27/2228—
    • G02B27/2264—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines

Definitions

  • the present invention relates to liquid crystal displaying techniques, and in particular to a side-edge backlight module having non-uniformly sized backlight sections and a deign method thereof.
  • the fast development of LED television is now getting into a new era of 3D liquid crystal television.
  • 3D liquid crystal televisions one of the most commonly used techniques is the shutter glasses 3D displaying technique, in which separate display of signals for left and right eyes is done with sectionalized illumination of backlighting and is used in combination with synchronous flashing of eyeglasses to make the left and right eyes perceiving different images.
  • the shutter glasses 3D displaying technique applies image processing technology to provide a visual effect to human eyes that looks like a stereoscopic movie, which generally comprises alternately supplying signals of left-eye frames and right-eye frames to a liquid crystal panel in order to drive the liquid crystal panel to separately form left-eye images and right-eye images.
  • This when combined with illumination of a scanning backlight unit and timing control of the shutter glasses, allows the left-eye signals and the right-eye signals to respectively simulate the left eye and the right eye, making a person perceive a 3D image.
  • the 3D liquid crystal display devices have a drawback that since the liquid crystal panel does not emit light by itself, backlighting must be provided to serve as a light source. Due to the consideration of cost factor, sectionalization of the backlight cannot be made very fine.
  • FIG. 1 a schematic view showing sectionalized lighting and light leakage of a conventional side-edge LED backlight is given.
  • the side-edge LED backlight comprises LED chips that are arranged along circumferential edges of a liquid crystal panel and a light guide plate is included to allow the LED backlight to be lit in a sectionalized manner for conducting light emitting from the circumferential edges of the liquid crystal display panel through the light guide plate to reach a central zone of the liquid crystal display panel.
  • the side-edge LED backlight has two advantages. One is that less LED chips can be used and cost is lowered down. The other is that it is possible to make a device body thin by not arranging LED modules on the back side of the liquid crystal panel of LED television but at lateral sides so as to reduce the overall thickness of the liquid crystal panel and thus make the device body extremely thin.
  • FIG. 1 shows a backlighting section 11 that is of light incidence at a right side short edge.
  • Asymmetry of light leakage is because leakage gets severer with the longer light path.
  • the backlighting section 11 is lit, light leaks to the sections 12 and 13 on the opposite sides thereof and this causes interference between left-eye and right-eye signals.
  • the left eye may perceive the signal for the right eye (or the right eye sees the signal for the left eye) and this makes image blurred (for the two signals show distributions that overlap in space).
  • the criterion for assessing image blurring is cross-talking, of which a higher value indicates severer interference. Thus, it is an important issue to reduce cross-talking while maintaining price competitiveness for products.
  • the cross-talking occurring between a left-eye signal and a right-eye signal of the conventional shutter glasses 3D displaying technique is determined by the technical nature thereof.
  • the backlight module of the conventional shutter glasses liquid crystal 3D display is arranged to form an even number of backlighting sections by dividing a horizontal block in a vertical direction and scanning is carried out from top to bottom to sequentially control activation and operation time for each backlighting section of the backlight module.
  • Image signals left-eye signals and right-eye signals
  • FIGS. 2A and 2B schematic views illustrating sectionalized lighting of backlight for a 46-inch single short edge side-edge LED television are given.
  • the backlight module 20 is often divided into an even number backlight sections, such as four sections, for sectionalized lighting.
  • An edge side backlight section 21 once lit, leaks toward the middle, while a middle backlight section 22 , once lit, leaks toward opposite sides.
  • FIG. 3 a schematic view showing nine points on a liquid crystal panel where cross-talking is measured.
  • a display screen 30 has adjacent sizes of which the dimensions are respectively denoted by reference symbols H and V.
  • the nine points, namely point 1 , point 2 , . . . , and point 9 are arranged according to the relative positioning relationship as shown in FIG. 3 .
  • the locations of point 1 , point 2 , . . . , and point 9 on the display screen are exactly the locations on the liquid crystal panel. Measurements are made on a conventional LED television with 46-inch single short edge incidence and four backlight section scanning and the detected cross-talks at the nine points of point 1 , point 2 , . . .
  • FIG. 4 a schematic view is given to illustrate the timing relationship (a left-eye signal being used for demonstration) between the backlight sections of a conventional 46-inch single short edge side-edge LED television and the liquid crystal panel signals (the left-eye image and the right-eye image signal applied to the liquid crystal panel).
  • the backlight module is divided, sequentially from top to bottom, into a first backlight section 41 , a second backlight section 42 , a third backlight section 43 , and a fourth backlight section 44 , which respectively function to illuminate first, second, third, and fourth display sections of a liquid crystal panel 40 .
  • FIG. 4 a schematic view is given to illustrate the timing relationship (a left-eye signal being used for demonstration) between the backlight sections of a conventional 46-inch single short edge side-edge LED television and the liquid crystal panel signals (the left-eye image and the right-eye image signal applied to the liquid crystal panel).
  • the backlight module is divided, sequentially from top to bottom, into a first backlight section 41 , a second backlight section
  • a left-eye signal is taken as an example for demonstrating four successive steps of the operations of the liquid crystal panel 40 and the backlight module for displaying liquid crystal panel signals: step a, in which the first to third display sections are loaded with a left-eye signal of the current frame and the fourth display section is loaded with a right-eye signal of the previous frame; the first backlight section 41 is lit to illuminate the first display section and since leakage from the first backlight section 41 might undesirably illuminate the fourth display section, the right-eye signal of the previous frame loaded in the fourth display section becomes an error signal of cross-talking with the left-eye signal of the current frame loaded in the first display section; since the first display section and the fourth display section are spaced from each other by two display sections therebetween and the distance is great, the cross-talking so caused is minor; step b, in which the fourth display section is also loaded with the left-eye signal of the current frame so that at this moment, the liquid crystal panel 40 is entirely loaded with the left-eye signal; the second backlight section 42 is lit to
  • the liquid crystal panel 40 repeats the processes of loading a right-eye signal (the previous frame), loading a left-eye signal (the current frame), loading a right-eye signal (the next frame), loading a left-eye signal, loading a right-eye signal, and so on. Since the conventional side-edge backlight sections are set up for sections of even number, when an error signal appears, the influence it imposes on the upper and lower sides is different.
  • the error signal generated when a backlight section is lit is closer to the upper side and the upper side cross-talking is severe in the liquid crystal panel 40 so that the cross-talking of the liquid crystal panel 40 is unsymmetrical in the vertical direction. Adjustment may be directly made on the liquid crystal panel signal to make backlight section lit at a center of the liquid crystal panel signal.
  • the cross-talking of the liquid crystal panel 40 can be made substantially symmetric in the vertical direction, yet due to the number of the backlight sections being even, the quality of image at the center position will be sacrificed and cross-talking gets serious.
  • an object of the present invention is to improve cross-talking by using non-uniformly sized backlight sections in order to enhance displaying quality.
  • the present invention provides a side-edge non-uniform backlight module having non-uniformly sized backlight sections.
  • the side-edge backlight module having non-uniformly sized backlight sections comprises backlight sections that have relative sizes satisfying the condition that the backlight sections have higher ranks are of greater sizes, wherein ranking the backlight sections is made by conducting an simulation operation for a process of sectionalized lighting of backlight to display liquid crystal panel signals on the basis of uniformly sized backlight sections according to predetermined liquid crystal panel signals and backlight scanning timing and conducting analysis of the number of zones where an interference signal appears and distance of the interference signal when each of backlight sections is lit in the simulation operation on the basis of uniformly sized backlight sections and ranking the backlight sections according to strength of cross-talking caused by the interference signal when each of the backlight sections is lit so that a backlight section having less strong cross-talking is set with a higher rank.
  • the side-edge backlight module comprises first, second, third, fourth, and fifth backlight sections, among which the third backlight section has the greatest size, the second and fourth backlight sections have the second greatest size, and the first and fifth backlight sections have the third greatest size.
  • the side-edge backlight module comprises first, second, third, and fourth backlight sections, among which the second backlight section has the greatest size, the first backlight section has the second greatest size, the third backlight section has the third greatest size, and the fourth backlight section has the fourth greatest size.
  • the side-edge backlight module is of single short edge incidence.
  • the side-edge backlight module is of dual short edge incidence.
  • the present invention also provided a side-edge backlight module having non-uniformly sized backlight sections, which comprises backlight sections that have relative sizes satisfying the condition that the backlight sections have higher ranks are of greater sizes, wherein ranking the backlight sections is made by conducting an simulation operation for a process of sectionalized lighting of backlight to display liquid crystal panel signals on the basis of uniformly sized backlight sections according to predetermined liquid crystal panel signals and backlight scanning timing and conducting analysis of the number of zones where an interference signal appears and distance of the interference signal when each of backlight sections is lit in the simulation operation on the basis of uniformly sized backlight sections and ranking the backlight sections according to strength of cross-talking caused by the interference signal when each of the backlight sections is lit so that a backlight section having less strong cross-talking is set with a higher rank;
  • the side-edge backlight module comprises first, second, third, fourth, and fifth backlight sections, among which the third backlight section has the greatest size, the second and fourth backlight sections have the second greatest size, and the first and fifth backlight sections have the third greatest size; and
  • side-edge backlight module is of single short edge incidence.
  • the present invention also provides a method for designing a side-edge backlight module having non-uniformly sized backlight sections, which comprises the following steps:
  • Step 1 conducting an simulation operation for a process of sectionalized lighting of backlight to display liquid crystal panel signals on the basis of uniformly sized backlight sections according to predetermined liquid crystal panel signals and backlight scanning timing;
  • Step 2 conducting analysis of the number of zones where an interference signal appears and distance of the interference signal when each of backlight sections is lit in the simulation operation on the basis of uniformly sized backlight sections and ranking the backlight sections according to strength of cross-talking caused by the interference signal when each of the backlight sections is lit so that a backlight section having less strong cross-talking is set with a higher rank;
  • Step 3 providing a higher-rank backlight section with a relatively larger size.
  • the side-edge backlight module is of single short edge incidence.
  • the side-edge backlight module is of dual short edge incidence.
  • the present invention provides a side-edge backlight module having non-uniformly sized backlight sections and a design method thereof, which use liquid crystal panel signals and backlight scanning timing to determine the influence on cross-talking caused by each of the backlight sections in order to improve cross-talking and enhance displaying quality through modification of the relative sizes of the backlight sections.
  • FIG. 1 is a schematic view showing sectionalized lighting and leakage of a conventional side-edge LED backlight
  • FIGS. 2A and 2B are schematic views illustrating sectionalized backlight lighting of a 46-inch single edge side-edge LED television
  • FIG. 3 is a schematic view showing the sites of 9 points on a display screen for measuring cross-talking
  • FIG. 4 is a schematic view showing timing relationship (for left-eye signal) between backlight sections of a 46-inch single short edge side-edge LED television and liquid crystal panel signals;
  • FIGS. 5A and 5B are diagrams illustrating liquid crystal panel signals and backlight scanning timing when the number of backlight sections is odd;
  • FIGS. 6A and 6B are diagrams illustrating liquid crystal panel signals and backlight scanning timing when the number of backlight sections is even;
  • FIG. 7A is a schematic view illustrating relative sizes of the backlight sections that are of an odd number for a preferred embodiment of the side-edge backlight module having non-uniformly sized backlight sections according to the present invention
  • FIG. 7B is a schematic view illustrating relative sizes of the backlight sections that are of an even number for another preferred embodiment of the side-edge backlight module having non-uniformly sized backlight sections according to the present invention.
  • FIG. 8 is a flow chart illustrating a design method for a side-edge backlight module having non-uniformly sized backlight sections.
  • the present invention uses non-uniformly sized backlight sections to improve cross-talking and enhance quality of displaying.
  • FIG. 8 a flow chart is given to illustrate a design method for a side-edge backlight module having non-uniformly sized backlight sections. The method comprises the following steps:
  • Step 1 conducting an simulation operation for a process of sectionalized lighting of backlight to display liquid crystal panel signals on the basis of uniformly sized backlight sections according to predetermined liquid crystal panel signals and backlight scanning timing;
  • Step 2 conducting analysis of the number of zones where an interference signal appears and distance of the interference signal when each of backlight sections is lit in the simulation operation on the basis of uniformly sized backlight sections and ranking the backlight sections according to strength of cross-talking caused by the interference signal when each of the backlight sections is lit so that a backlight section having less strong cross-talking is set with a higher rank;
  • Step 3 providing a higher-rank backlight section with a relatively larger size.
  • the method is applicable to for example single short edge incidence backlight module or dual short edge incidence backlight module for designing side-edge backlight module having non-uniformly sized backlight sections.
  • FIGS. 5A and 5B are diagrams showing liquid crystal panel signals and backlight scanning timing where the number of backlight sections is odd. As shown in FIG. 5A , the number of sections used is odd and a specific example of four is given. The left-eye and right-eye liquid crystal panel signals are shown sequentially arranged. The ranges of the left-eye and right-eye signals are indicated by braces. As shown in FIG. 5A , the simulation operation is conducted according to Step 1 , where when the backlight is lit, lighting can be selected to be constantly maintained at the center of the liquid crystal panel signal in order to minimize cross-talking. For a backlight module that is composed of 2n+1 (n being a natural number) backlight sections, a liquid crystal panel signal that is correspondingly divided into 2n+1 sections.
  • n+1 being a natural number
  • Maintaining lighting at the center of the liquid crystal panel signal means lighting the n+1th section of the liquid crystal panel signal. In this way, the distance from the previous or next interference signal is the greatest, making the cross-talking minimized.
  • FIG. 5B As shown in FIG. 5B , during the cycling process of the liquid crystal panel signals, the first, second, and third sections of backlight are lit separately. The location where the backlight section is lit is indicated by hatching. It is noted from the drawing that the locations, as well as the number thereof, where the interference signals occur are different. In other words, the strength of cross-talking so caused is different, leading to asymmetry of cross-talking.
  • the strength of cross-talking is identical when the second and fourth backlight sections are lit and the strength of cross-talking is also identical when the first and fifth backlight sections are lit.
  • the present invention follows Step 2 to rank the backlight sections according to the strength of the interference signal and then follows Step 3 to modify the relative sizes of the backlight sections by decreasing the size of a backlight section that causes a severer interference signal so as to reduce the strength of the interference caused thereby and thus making the displaying quality approaching symmetry.
  • Step 2 to rank the backlight sections according to the strength of the interference signal
  • Step 3 to modify the relative sizes of the backlight sections by decreasing the size of a backlight section that causes a severer interference signal so as to reduce the strength of the interference caused thereby and thus making the displaying quality approaching symmetry.
  • FIG. 7A a schematic view is given to illustrate relative sizes of the backlight sections that are of an odd number for a preferred embodiment of the side-edge backlight module having non-uniformly sized backlight sections according to the present invention.
  • the number of the backlight sections is five.
  • the side-edge backlight module comprises, in sequence, first, second, third, fourth, and fifth backlight sections, and the relative sizes of the backlight sections are modified according to the present invention so that the sizes of the backlight sections are increased from the smallest at the ends to the greatest in the center and are made symmetric in the up-down direction.
  • the third backlight section has the greatest size
  • the second and fourth backlight sections have the second greatest size
  • the first and fifth backlight sections have the third greatest size.
  • the present invention provides only an example of five backlight sections for illustration, yet the same process can be applied to different numbers of backlight sections to make an analysis for determining the relative sizes. A simulation may then be conducted for minor adjustment. Adopting the side-edge backlight module having non-uniformly sized backlight sections according to the present invention and making displaying according to the predetermined liquid crystal panel signals and backlight scanning timing can apparently improve cross-talking and enhance quality of displaying.
  • FIGS. 6A and 6B are diagrams showing liquid crystal panel signals and backlight scanning timing where the number of backlight sections is even. As shown in FIG. 6A , the number of sections used is even and a specific example of four is given. The left-eye and right-eye liquid crystal panel signals are shown sequentially arranged. The ranges of the left-eye and right-eye signals are indicated by braces. In FIG. 6A , the sections are of an even number and the location where the backlight section is lit is indicated by hatching. When the backlight is lit, lighting can be selected to be constantly maintained at the second section of the liquid crystal panel signal in order to minimize cross-talking at the center.
  • n being a natural number
  • lighting of the backlight can be selectively maintained at the nth section of the liquid crystal panel signal, namely being as close to the center of the liquid crystal panel signal as possible, so as to minimize cross-talking at the center.
  • FIG. 6B shows four different displaying timing (having an even number of sections: four sections), where the first, second, and third sections of backlight are lit separately (the second section being free of interference signal so that the section size can be the greatest).
  • the previously described steps of the present invention are followed to rank the strengths of interference signal occurring when each of the backlight sections is lit in order to modify the relatively sizes of the backlight sections and thus obtaining the relative sizes of the backlight sections shown in FIG. 7B for an even number of backlight sections.
  • the number of the backlight sections is four, where the side-edge backlight module comprises, in sequence, first, second, third, and fourth backlight sections.
  • the second backlight section has the greatest size
  • the first backlight section has the second greatest size
  • the third backlight section has the third greatest size
  • the fourth backlight section has the fourth greatest size.
  • the present invention provides a side-edge backlight module having non-uniformly sized backlight sections and a design method thereof, which use liquid crystal panel signals and backlight scanning timing to determine the influence on cross-talking caused by each of the backlight sections in order to improve cross-talking and enhance displaying quality through modification of the relative sizes of the backlight sections.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
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US15/488,450 2012-07-27 2017-04-15 Side-edge backlight module having non-uniformly sized backlight sections and design method thereof Abandoned US20170219764A1 (en)

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CN201210264250.7A CN102767763B (zh) 2012-07-27 2012-07-27 具有不均匀大小背光分区的侧入式背光模组及其设计方法
CN201210264250.7 2012-07-27
US13/698,039 US9684121B2 (en) 2012-07-27 2012-08-03 Side-edge backlight module having non-uniformly sized backlight sections and design method thereof
US15/488,450 US20170219764A1 (en) 2012-07-27 2017-04-15 Side-edge backlight module having non-uniformly sized backlight sections and design method thereof

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