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WO2008015827A1 - Dispositif d'affichage et son procédé de conception - Google Patents

Dispositif d'affichage et son procédé de conception Download PDF

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Publication number
WO2008015827A1
WO2008015827A1 PCT/JP2007/058817 JP2007058817W WO2008015827A1 WO 2008015827 A1 WO2008015827 A1 WO 2008015827A1 JP 2007058817 W JP2007058817 W JP 2007058817W WO 2008015827 A1 WO2008015827 A1 WO 2008015827A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
arrangement
light emitting
display area
fluorescent lamps
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/058817
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English (en)
Japanese (ja)
Inventor
Yasumori Kuromizu
Hirokazu Mouri
Noriyuki Hoshiai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of WO2008015827A1 publication Critical patent/WO2008015827A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

Definitions

  • the present invention relates to a display device including a display panel and a direct type backlight having a light emitting region for irradiating the display panel from the back side, and a design method thereof.
  • Such a liquid crystal display device usually has a configuration in which polarizing plates are mounted on a light incident side and a light output side of a liquid crystal panel in which a liquid crystal layer is held by a pair of glass substrates, and enters the liquid crystal panel.
  • the image is displayed by modulating the polarization state of the emitted linearly polarized light with the liquid crystal layer.
  • transmissive liquid crystal display devices are currently the mainstream.
  • a backlight for that purpose is an essential component.
  • a side light type backlight and a direct type backlight are known.
  • a sidelight-type backlight has a line light source arranged on the side outside the display area, introduces light from the line light source into the light guide plate, and reflects and diffuses it by a regular uneven pattern of the light guide plate.
  • the surface light source is formed by the above.
  • a direct type backlight is formed by arranging a plurality of fluorescent lamps directly below the back side of the display area of a liquid crystal panel, and reflects the light on the back side of the fluorescent lamp to form a surface light source, and a fluorescent lamp And a functional optical member such as a diffusing sheet or a lens film for uniformizing the brightness of surface emission between the liquid crystal panel and the liquid crystal panel.
  • a fluorescent lamp in a direct type backlight a cold cathode fluorescent tube and a hot cathode fluorescent tube with high luminous efficiency and high brightness can be used.
  • the direct type backlight easily obtains high luminance, and is therefore widely used for configuring monitors and televisions that place importance on luminance.
  • the direct-type backlight has a problem that the luminance uniformity on the light emitting surface is greatly influenced by the arrangement of the fluorescent lamps.
  • Patent Document 1 The technique disclosed in Patent Document 1 is a fluorescent lamp disposed in a direct type backlight for the purpose of improving the central luminance while suppressing unevenness in luminance on the illumination surface of the direct type backlight.
  • the pitch is narrow at the center of the housing and wide at the periphery.
  • luminance unevenness is regarded as a difference between the maximum luminance and the minimum luminance on the entire illumination surface.
  • Patent Document 2 a U-shaped fluorescent lamp or an S-shaped fluorescent lamp is used, but the mounting pitch of the fluorescent lamp is gradually narrowed from the end toward the center.
  • the configuration to be disclosed is disclosed.
  • Patent Document 1 Japanese Patent Publication “JP 2004-287226” Publication Date (October 14, 2004)
  • Patent Document 2 Japanese Patent Publication “JP 2005-292226” (Publication Date: October 20, 2005 (corresponding US Patent Publication “US 2005/219861 A1J (Publication Date: October 6, 2005))”
  • Patent Document 3 Japanese Published Patent Publication “JP 2002-82626” (Published March 2002 2 2)
  • the present invention has been made in view of the above-described problems, and the object thereof is sufficiently good in actual display observation while suppressing the number of linear light emitting portions such as fluorescent lamps.
  • the object is to provide a display device capable of maintaining display quality.
  • the display device is a display device including a display panel and a direct type backlight for irradiating the display panel from the back side, and is parallel to each other across the back side of the display panel.
  • the central portion of the display area has a plurality of linear light emitting portions arranged on the display area, and the number of light emitting sections to be arranged is smaller than the case where the arrangement interval of the light emitting sections is aligned with the arrangement interval of the central area of the display area.
  • the arrangement interval of the light emitting parts is set wider, and along the direction perpendicular to the longitudinal direction of the light emitting part through the center of the display area, the luminance distribution through the display panel is Approximate quadratic curve of the brightness distribution curve is configured so that the error is within 5%! RU
  • the light emission at the edge of the display area is smaller than that at the center of the display area so that the number of light emitting parts to be arranged is smaller than when the arrangement interval of the light emitting parts is aligned with the arrangement interval of the central area of the display area.
  • the arrangement interval of the parts is set wide. As a result, it is possible to reduce the number of light emitting units, and to suppress the cost and power consumption of the apparatus.
  • the cost of the light emitting units themselves is more than reduced by simplifying circuit elements such as an inverter circuit for driving the light emitting units, reducing the board area, and reducing the number of parts. If the use of fluorescent lamps as light emitting parts is reduced, the amount of mercury used in fluorescent lamps can be reduced by reducing the number of light emitting parts. The effect that it can be configured is also obtained.
  • the luminance unevenness in the display area tends to increase.
  • Conventional display area Although consideration was given to reducing the overall brightness unevenness of the image, it was observed by combining it with a display panel because of sufficient attention to local brightness unevenness. In an actual display, it is easy to observe locally unnatural brightness (for example, the area between the center of the display area and the edge of the display area is brighter or darker than the surrounding area). .
  • the luminance distribution along the direction perpendicular to the longitudinal direction of the light emitting portion through the center of the display region has an error within ⁇ 5% with respect to the approximate quadratic curve of the luminance distribution curve.
  • the approximate quadratic curve means an approximate quadratic curve obtained by the method of least squares.
  • the ratio of the luminance at the edge of the display area to the luminance at the center of the display area in the luminance distribution is 55% or more.
  • the light emitting units are arranged at substantially equal intervals in a region of 30% of the center of the display region.
  • a region where the light emitting units are arranged at substantially equal intervals is a region that is 40% or less of the central portion of the display region.
  • a display device design method is a display device design method including a display panel and a direct type backlight for illuminating the display panel with a back force, and includes the direct type backlight.
  • the light emitting parts are arranged at the end of the display area wider than the center of the display area, so that the light emitting parts pass through the center of the display area and are orthogonal to the longitudinal direction of the light emitting part.
  • FIG. 1 (a) is a plan view showing a configuration of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 1 (b) is a cross-sectional view taken along line AA in FIG. 1 (a).
  • FIG. 2 is a cross-sectional view of a backlight portion for explaining the arrangement relationship of fluorescent lamps in the liquid crystal display device of FIG.
  • FIG. 3 A chart summarizing the results of experiments conducted to investigate the relationship between the arrangement of fluorescent lamps and display quality.
  • FIG. 4 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 4 (b) is a graph showing the luminance distribution in the arrangement of FIG. 4 (a).
  • FIG. 5 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 5 (b) is a graph showing the luminance distribution in the arrangement of FIG. 5 (a).
  • FIG. 6 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 6 (b) is a graph showing the luminance distribution in the arrangement of FIG. 6 (a).
  • FIG. 7 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 7 (b) is a graph showing the luminance distribution in the arrangement of FIG. 7 (a).
  • FIG. 8 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 8 (b) is a graph showing the luminance distribution in the arrangement of FIG. 8 (a).
  • FIG. 9 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 9 (b) is a graph showing the luminance distribution in the arrangement of FIG. 9 (a).
  • FIG. 10 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 10 (b) is a graph showing the luminance distribution in the arrangement of FIG. 10 (a).
  • FIG. 11 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 11 (b) is a graph showing the luminance distribution in the arrangement of FIG. 11 (a).
  • FIG. 12 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 12 (b) is a graph showing the luminance distribution in the arrangement of FIG. 12 (a).
  • FIG. 13 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 13 (b) is a graph showing the luminance distribution in the arrangement of FIG. 13 (a).
  • FIG. 14 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 14 (b) is a graph showing the luminance distribution in the arrangement of FIG. 14 (a).
  • FIG. 15 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 15 (b) is a graph showing the luminance distribution in the arrangement of FIG. 15 (a).
  • FIG. 16 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 16 (b) is a graph showing the luminance distribution in the arrangement of FIG. 16 (a).
  • FIG. 17 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 17 (b) is a graph showing the luminance distribution in the arrangement of FIG. 17 (a).
  • FIG. 18 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 18 (b) is a graph showing the luminance distribution in the arrangement of FIG. 18 (a).
  • FIG. 19 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 19 (b) is a graph showing the luminance distribution in the arrangement of FIG. 19 (a).
  • FIG. 20 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 20 (b) is a graph showing the luminance distribution in the arrangement of FIG. 20 (a).
  • FIG. 21 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 21 (b) is a graph showing the luminance distribution in the arrangement of FIG. 21 (a).
  • FIG. 22 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 22 (b) is a graph showing the luminance distribution in the arrangement of FIG. 22 (a).
  • FIG. 23 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 23 (b) is a graph showing the luminance distribution in the arrangement of FIG. 23 (a).
  • FIG. 24 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 24 (b) is a graph showing the luminance distribution in the arrangement of FIG. 24 (a).
  • FIG. 25 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 25 (b) is a graph showing the luminance distribution in the arrangement of FIG. 25 (a).
  • FIG. 26 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 26 (b) is a graph showing the luminance distribution in the arrangement of FIG. 26 (a).
  • FIG. 27 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 27 (b) is a graph showing the luminance distribution in the arrangement of FIG. 27 (a).
  • FIG. 28 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 28 (b) is a graph showing the luminance distribution in the arrangement of FIG. 28 (a).
  • FIG. 29 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 29 (b) is a graph showing the luminance distribution in the arrangement of FIG. 29 (a).
  • FIG. 30 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 30 (b) is a graph showing the luminance distribution in the arrangement of FIG. 30 (a).
  • FIG. 31 (a) is a chart showing an example of arrangement of fluorescent lamps.
  • FIG. 31 (b) is a graph showing the luminance distribution in the arrangement of FIG. 31 (a).
  • FIG. 32 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 32 (b) is a graph showing the luminance distribution in the arrangement of FIG. 32 (a).
  • FIG. 33 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 33 (b) is a graph showing the luminance distribution in the arrangement of FIG. 33 (a).
  • FIG. 34 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 34 (b) is a graph showing the luminance distribution in the arrangement of FIG. 34 (a).
  • FIG. 35 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 35 (b) is a graph showing the luminance distribution in the arrangement of FIG. 35 (a).
  • FIG. 36 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 36 (b) is a graph showing the luminance distribution in the arrangement of FIG. 36 (a).
  • FIG. 37 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 37 (b) is a graph showing the luminance distribution in the arrangement of FIG. 37 (a).
  • FIG. 38 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 38 (b) is a graph showing the luminance distribution in the arrangement of FIG. 38 (a).
  • FIG. 39 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 39 (b) is a graph showing the luminance distribution in the arrangement of FIG. 39 (a).
  • FIG. 40 (a) is a chart showing an arrangement example of fluorescent lamps.
  • FIG. 40 (b) is a graph showing the luminance distribution in the arrangement of FIG. 40 (a).
  • FIG. 1 (a) and FIG. 1 (b) show a plan view and a cross-sectional view, respectively, of the liquid crystal display device 1 in the present embodiment.
  • the cross-sectional view of FIG. 1 (b) is a cross-sectional view taken along line AA in FIG. 1 (a).
  • the liquid crystal display device (display device) 1 includes a transmissive liquid crystal display panel (display panel) 20 and a direct backlight 10 for irradiating the liquid crystal display panel 20 from the back. Has been.
  • the liquid crystal display panel 20 is a display panel that displays an image by controlling the transmission state of light irradiated on the back surface for each pixel. Since the liquid crystal display panel 20 having a conventional configuration can be used, a detailed description of the configuration is omitted here. Instead of the liquid crystal display panel 20, another display panel that displays an image by controlling the transmission state of the light applied to the back surface for each pixel may be used.
  • the backlight 10 is for irradiating the back surface of the liquid crystal display panel 20 by emitting surface emitting light on the back surface of the liquid crystal display panel 20.
  • the backlight 10 includes a housing 11, a fluorescent lamp 12, and a diffusing member 13. Details of these members are as follows.
  • the knocklight 10 is further provided with a power supply device that supplies power for causing the fluorescent lamp 12 to emit light. Illustration of this power supply device is omitted.
  • the housing 11 is a box having a rectangular opening, a rectangular bottom slightly smaller than the opening, and a side surface inclined so as to face the opening, and the cross-sectional shape thereof is a trapezoid. It has become.
  • the planar shape of the opening corresponds to the shape of the display area 20a of the liquid crystal display panel 20.
  • the inner surface of the housing 11 is surface-treated so as to efficiently reflect the light of the fluorescent lamp 12, and functions as a reflector.
  • Each of these fluorescent lamps 12 forms a linear light-emitting portion, and the respective longitudinal directions thereof coincide with the longitudinal direction of the display region 20a and are arranged in parallel to each other on the same plane.
  • the fluorescent lamp 12 is supported through a support member (not shown) in a state where the bottom surface force of the housing 11 is slightly lifted. Note that the fluorescent lamp 12 does not necessarily have to be a straight line, but even if it is U-shaped or S-shaped, if there are linear portions arranged parallel to each other on the same plane, Each of these parts forms the linear light emitting part.
  • the diffusing member 13 reflects and diffuses the light emitted from the fluorescent lamp 12.
  • This is a sheet-like or plate-like member for converting the light emitted from the knocklight 10, that is, the light irradiating the liquid crystal display panel 20, into a surface-emitting state with a flattened brightness. It is provided to cover.
  • a polarizing conversion film that converts the transmitted light into linearly polarized light, a prism layer and a prism protective sheet for improving the luminance in the front direction of the liquid crystal display panel 20 may be provided on the diffusing member 13.
  • the prism protective sheet prevents the prism sheet as the prism layer from being damaged by contact with the polarization conversion film, etc., and suppresses deformation by sandwiching the prism sheet that is easily deformed due to temperature changes. By functioning as a lid, it contributes to higher brightness.
  • the longitudinal direction of the display region 20a and the direction perpendicular thereto are referred to as a horizontal direction and a vertical direction, respectively.
  • the multiple fluorescent lamps 12 are arranged so as to be plane-symmetric with respect to a virtual plane N perpendicular to the display surface at the longitudinal center of the display region 20a. Therefore, unless otherwise specified, only one side (the right side in FIG. 2) with respect to the virtual plane N will be described below.
  • the fluorescent lamp 12 has a distance from the virtual plane N of XI, ⁇ 2, ⁇ 3, ⁇ , Xi, ⁇ , Xn (where i is an integer from 1 to n and n is the number of fluorescent lamps 12). There are a total of n at the position (2n in total when combined on both sides).
  • the interval between the position X (i ⁇ 1) and XI, that is, the pitch of the fluorescent lamp 12 is Pi.
  • the arrangement of the fluorescent lamp 12 is closely related to the display quality when the liquid crystal display device 1 performs display. Therefore, how to arrange the fluorescent lamp 12 is important in order to maintain a sufficiently good display quality.
  • each arrangement in Fig. 3 is as shown in Fig. 4 (a) to Fig. 40 (a) described in "Reference drawing for arrangement". It is a cage.
  • the display quality is verified for each of the case where a moving image is displayed and the case where a still image is displayed. The results are shown as ⁇ (good), ⁇ (somewhat bad), and X (bad) in FIG. The comment of the judge is added.
  • the brightness distribution measurement results conducted in search of conditions for maintaining good display quality are shown in Fig. 3.
  • a display area 20a having a width of about 1020 mm and a length of about 570 mm is used.
  • the diffusing member 13 a common diffusing plate in which three common diffusing sheets were stacked was used.
  • the luminance distribution is measured using a general luminance distribution meter installed at a position where the entire display area 20a can be measured from the center of the display area 20a on the display surface of the liquid crystal display panel 20 to the normal direction of the display surface.
  • the test was performed for a white display state (maximum luminance display) of 1.
  • the result of measurement by the luminance distribution meter is input to a personal computer and processed to obtain a vertical luminance distribution in the center of the display area 20a shown in the graphs of FIGS. 4 (b) to 40 (b) (in the graph (Solid line).
  • the vertical axis in the graphs of Fig. 4 (b) to Fig. 40 (b) is the ratio to the brightness of the light source as a reference, that is, a relative value, and "20" corresponds to 600 cd / m 2.
  • the horizontal axis in the graphs of FIGS. 4B to 40B indicates the vertical position in the central portion of the display area 20a (the central portion is 0).
  • the luminance at the center of the display area 2 Oa greatly affects the brightness of the entire display perceived by the observer. It is necessary to maintain the brightness at the center of the area 20a. As shown in the figure, the arrangement interval of the fluorescent lamps 12 needs to be set wider at the end of the display area 20a than at the center of the display area 20a.
  • the fluorescent lamp 12 when considering the arrangement of the fluorescent lamp 12 so as not to satisfy the condition 1, the fluorescent light in the central area 30% of the display area 20a, that is, in the range of about 85 mm from the virtual plane N shown in FIG.
  • the distance between the lamps 12 is almost equal (the variation of the distance from the central distance (24mm) is within 5% (1.2mm).
  • the fluorescent lamp 12 is arranged such that the condition that the fluorescent lamps 12 are arranged at almost equal intervals in the central 30% of the display area 20a (hereinafter referred to as “condition 3” t) is satisfied. I hope.
  • condition 4 the arrangement of the fluorescent lamp 12 satisfies the condition 3 and the condition that the area where the arrangement of the fluorescent lamp 12 is substantially equidistant is 40% or less (hereinafter referred to as “condition 4”). It is desirable to satisfy.
  • the liquid crystal display panel 20 has a display area 20a having a width of about 1020 mm and a length of about 570 mm.
  • the above conditions 1 to 4 obtained thereby Is generally applicable to liquid crystal display panels 20 of other sizes. Because, normally, when an observer observes the liquid crystal display panel 20, the distance from the liquid crystal display panel 20 is naturally adjusted according to the size (screen size) of the display area 20a of the liquid crystal display panel 20. This is because if the screen size is large, the distance is increased, and if the screen size is small, the distance is decreased. As a result, the influence of the screen size is offset by adjusting the distance. In particular, conditions 1, 3, and 4 are less related to the screen size because they focus on local luminance unevenness.
  • the liquid crystal display device 1 is configured by arranging the fluorescent lamps 12, and the luminance distribution is measured in the same manner as in the above-described experiment.
  • the desired arrangement interval of the fluorescent lamp 12 is determined by the process and the step of adjusting the arrangement interval of the fluorescent lamp 12 so that the error with respect to the approximated quadratic curve of the obtained luminance distribution curve is within ⁇ 5%. If you do,
  • the present invention can be applied to a display device including a display panel and a direct type backlight having a light emitting region for irradiating the display panel from the back side.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides comprenant une pluralité de lampes fluorescentes de forme linéaire disposées en parallèle les unes aux autres sur une face arrière d'un panneau d'affichage. Pour rendre le nombre de lampes fluorescentes disposées inférieur à celui en cas d'intervalle de placement des lampes conforme à une valeur dans une partie centrale de la zone d'affichage, l'intervalle de placement des lampes fluorescentes au niveau de bords de la zone d'affichage est conçu pour être supérieur à celui dans la partie centrale de la zone d'affichage et une distribution de brillance à travers le panneau d'affichage dans une direction passant par la partie centrale de la zone d'affichage et perpendiculaire au sens longitudinal des lampes présente une erreur dans une plage de ±5 % par rapport à une courbe quadratique approximative de distribution de brillance. On peut ainsi maintenir une bonne qualité d'affichage dans une face d'affichage réelle tout en réduisant le nombre de lampes fluorescentes.
PCT/JP2007/058817 2006-08-04 2007-04-24 Dispositif d'affichage et son procédé de conception Ceased WO2008015827A1 (fr)

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JP2006-213885 2006-08-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2296137A1 (fr) * 2009-09-07 2011-03-16 Nxp B.V. Dispositif d'affichage d'images et son procédé de fonctionnement
CN104407460A (zh) * 2014-11-14 2015-03-11 深圳市华星光电技术有限公司 曲面显示器
TWI548916B (zh) * 2014-08-06 2016-09-11 友達光電股份有限公司 顯示裝置
CN106504695A (zh) * 2016-12-15 2017-03-15 深圳市立翔慧科光电科技有限公司 一种可弯曲的led显示屏局部亮度调整的控制方法

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WO2004038283A1 (fr) * 2002-10-22 2004-05-06 Sharp Kabushiki Kaisha Unite de retroeclairage et unite d'affichage a cristaux liquides utilisant une unite de retroeclairage
JP2004287226A (ja) * 2003-03-24 2004-10-14 Tama Electric Co Ltd バックライト装置及び液晶表示装置
JP2005251437A (ja) * 2004-03-01 2005-09-15 Matsushita Electric Ind Co Ltd バックライトユニット
JP2005292226A (ja) * 2004-03-31 2005-10-20 Funai Electric Co Ltd 液晶テレビ用バックライト装置
JP2005347062A (ja) * 2004-06-02 2005-12-15 Hitachi Displays Ltd バックライト装置及び液晶表示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004038283A1 (fr) * 2002-10-22 2004-05-06 Sharp Kabushiki Kaisha Unite de retroeclairage et unite d'affichage a cristaux liquides utilisant une unite de retroeclairage
JP2004287226A (ja) * 2003-03-24 2004-10-14 Tama Electric Co Ltd バックライト装置及び液晶表示装置
JP2005251437A (ja) * 2004-03-01 2005-09-15 Matsushita Electric Ind Co Ltd バックライトユニット
JP2005292226A (ja) * 2004-03-31 2005-10-20 Funai Electric Co Ltd 液晶テレビ用バックライト装置
JP2005347062A (ja) * 2004-06-02 2005-12-15 Hitachi Displays Ltd バックライト装置及び液晶表示装置

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EP2296137A1 (fr) * 2009-09-07 2011-03-16 Nxp B.V. Dispositif d'affichage d'images et son procédé de fonctionnement
TWI548916B (zh) * 2014-08-06 2016-09-11 友達光電股份有限公司 顯示裝置
CN104407460A (zh) * 2014-11-14 2015-03-11 深圳市华星光电技术有限公司 曲面显示器
CN106504695A (zh) * 2016-12-15 2017-03-15 深圳市立翔慧科光电科技有限公司 一种可弯曲的led显示屏局部亮度调整的控制方法
CN106504695B (zh) * 2016-12-15 2019-03-01 深圳市奥拓立翔光电科技有限公司 一种可弯曲的led显示屏局部亮度调整的控制方法

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