WO2008127050A1 - Light source device, control device thereof, and display device - Google Patents

Light source device, control device thereof, and display device Download PDF

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Publication number
WO2008127050A1
WO2008127050A1 PCT/KR2008/002076 KR2008002076W WO2008127050A1 WO 2008127050 A1 WO2008127050 A1 WO 2008127050A1 KR 2008002076 W KR2008002076 W KR 2008002076W WO 2008127050 A1 WO2008127050 A1 WO 2008127050A1
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WO
WIPO (PCT)
Prior art keywords
light emitting
emitting module
support member
color
light
Prior art date
Application number
PCT/KR2008/002076
Other languages
French (fr)
Inventor
Jun Suk Park
Chul Ho Park
Original Assignee
Lg Innotek Co., Ltd
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 Lg Innotek Co., Ltd filed Critical Lg Innotek Co., Ltd
Publication of WO2008127050A1 publication Critical patent/WO2008127050A1/en

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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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the controller 301 receives an optical signal for each color detected from the color sensor 345 of each light emitting module 320 and individually controls LED chips depending on the variation of a color characteristic of the LED chips in each module type according to time. In addition, it is possible to overcome a color shift phenomenon of the light source device derived from problem relating to a signal bar or module. When problems relating to a specific bar or module occur, the problems are fed-back to a user through a detection signal of a color sensor, so that a display state can be delivered to the user.

Abstract

Disclosed are a light source device, a control device thereof, and a display device. The light source device comprises a light emitting module comprising a light emitting device comprising a color LED chip, a bottom cover below the light emitting module, an optical sheet part over the light emitting module, and a support member comprising a color sensor, in which the support member maintains a distance between the optical sheet part and the light emitting module.

Description

Description
LIGHT SOURCE DEVICE, CONTROL DEVICE THEREOF,
AND DISPLAY DEVICE
Technical Field
[1] The embodiment relates to a light source device, a control device thereof, and a display device. Background Art
[2] Display apparatuses include a cathode ray tube (CRT), a liquid crystal display (LCD) using an electro-optic effect, a plasma display panel (PDP) using a gas-discharge effect, and an electro luminescence display (ELD) using an electro-luminescence effect. Among the display apparatuses, the study on the LCD has been actively performed.
[3] Since the LCD is advantageous in terms of miniaturization, weight, low power consumption, full color implementation and the like, the LCD can overcome the disadvantages of a CRT. Accordingly, the LCD has been widely used for various fields.
[4] Since such an LCD is a light receiving device that displays an image by adjusting the amount of light from the outside, the LCD requires an additional external light source such as a backlight unit. Disclosure of Invention Technical Problem
[5] The embodiment provides a light source device and a display device having the same, in which a module using a light emitting device and a color sensor provided on the module are employed.
[6] The embodiment provides a light source device and a display device having the same, in which a color sensor is provided in a support member maintaining the distance between a light emitting module and an optical sheet.
[7] The embodiment provides a light source device, a control device thereof, and a display device, capable of adjusting the chromaticity and the brightness of a light emitting module according to an optical property of the light emitting module by providing at least one support member on the light emitting module and providing a color sensor on at least one support member. Technical Solution
[8] The embodiment provides a light source device comprising; a light emitting module comprising a light emitting device comprising a color LED chip, a bottom cover below the light emitting module, an optical sheet part over the light emitting module, and a support member comprising a color sensor, in which the support member maintains a distance between the optical sheet part and the light emitting module.
[9] The embodiment provides a display device comprising; a bottom cover comprising a case shape, a light emitting module provided in a bottom cover, which the light emitting module comprises a light emitting device comprising a color LED chip, and a first support member supported by the light emitting module, which the light emitting module comprises a color sensor emitted from the color LED chip.
[10] The embodiment provides a light source controlling device comprising: a light emitting modules comprising at least two color LED chips, an optical sheet part and a display panel over the light emitting module, a support member which maintains a distance between the light emitting module and the optical sheet part, in which the support member comprises a color sensor detecting light emitting from the color LED chips, an analog digital converter which converts an optical signal detected by the color sensor into a digital signal, a driver which controls a driving current of the color LED chip of the light emitting module, and a controller which receives the digital signal of the analog digital converter to output color correction data used to adjust color coordinate deviation of the light emitting modules.
Advantageous Effects
[11] According to the embodiments, a module using a light emitting device is employed or a color sensor provided on the module is employed, thereby effectively detecting an optical property of each light emitting module. Accordingly, the chromaticity and the brightness of the light emitting module can be adjusted. [12] According to the embodiments, the brightness and the chromaticity of a light emitting module can be adjusted in real time. [13] According to the embodiments, it is possible to compensate for the color shift of a light source according to the characteristic variation of a light emitting module. [14] According to the embodiments, problems relating to colors of each light emitting module or all light emitting modules can be fedback to a user.
Brief Description of the Drawings
[15] FIG. 1 is a plan view showing a light source device according to a first embodiment;
[16] FIG. 2 is a plan view showing an example of a light emitting module according to the first embodiment; [17] FIG. 3 is a plan view showing another example of a light emitting module 120 according to the first embodiment;
[18] FIG. 4 is a side sectional view showing a first support member shown in FIG. 1;
[19] FIG. 5 is a perspective view showing the first support member shown in FIG. 1;
[20] FIG. 6 is a side sectional view showing a display device comprising a light source device according to the first embodiment; [21] FIG. 7 is a view showing a light receiving structure of a color sensor of the first support member shown in FIG. 6;
[22] FIG. 8 is a plan view showing a light source device according to a second embodiment;
[23] FIG. 9 is a view showing a light receiving structure of a color sensor of a first support member shown of FIG. 8;
[24] FIG. 10 is a block diagram showing a light source controlling device employing a light source device according to the embodiments; and
[25] FIG. 11 is a flowchart showing the procedure of controlling a light source by the light source controlling device shown in FIG. 10. Best Mode for Carrying Out the Invention
[26] Hereinafter, embodiments will be described with reference to accompanying drawings.
[27] FIG. 1 is a plan view showing a light source device according to a first embodiment.
[28] Referring to FIG. 1, a light source device 100 comprises a bottom cover 110, a reflective sheet 116, a light emitting module 120, and support members 130 and 150.
[29] The bottom cover 110 is prepared in the form of a container. The bottom cover 110 comprises Al, Mg, Zn, Ti, Ta, Hf, or Nb. The term, the shape, or the material of the bottom cover 110 may be changed, and the embodiment is not limited thereto.
[30] A side surface 112 of the bottom cover 110 is inclined outward at a predetermined angle (e.g., 90°to 160°) to reflect incident light.
[31] The light emitting module 120 is provided on a base 114 of the bottom cover 110.
The light emitting module 120 can be arranged in a vertical or horizontal direction. A plurality of the light emitting modules 120 can be coupled to each other in series or in parallel. In this case, the coupling structure of the light emitting modules 120 may be defined as an LED bar.
[32] A connector 118 can be provided at the end of the light emitting module 120. The connector 118 can be connected to a driver. The light emitting module 120 may be coupled to the driver through another scheme instead of the above connector scheme.
[33] The light emitting module 120 comprises a substrate on which at least one or at least one row of light emitting devices 125 is mounted. The light emitting device 125 can be bonded to a circuit pattern of the substrate in the form of a chip or a package. The light emitting devices 125 in each light emitting module 120 can be coupled to each other in series or in parallel, and various coupling schemes may be employed according to a pattern design.
[34] The reflective sheet 116 can be provided on the light emitting module 120 except for the area of the light emitting device 125. Such a reflective sheet 116 comprises a size covering at least one light emitting module 120, and reflects light emitted from the light emitting device 125 or light reflected from an optical sheet part, thereby increasing an amount of reflected light.
[35] At least one of the support members 130 and 150 is provided in the bottom cover
110. The support members 130 and 150 are vertically installed at a predetermined position of the bottom cover 110 and/or the light emitting module 120 to prevent the optical sheet part, which is provided on the bottom cover 110, from sagging.
[36] The arrangement direction of the support members 130 and 150 may be changed according to the width Wl of the light emitting module 120. The support members 130 and 150 are arranged by a predetermined interval. The numbers and the arrangement interval of the support members 130 and 150 provided on each light emitting module 120 may be changed according to the size of a display panel.
[37] A color sensor may be provided (reference number 145 of FIG. 4) in at least one of the support members 130 and 150. Hereinafter, the support member 130 comprising a color sensor is referred to as a first support member, and the support member 150 having no color sensor is referred to as a second support member.
[38] The first support member 130 may be provided at the center portion of the bottom cover 110 or each light emitting module 120. The first support member 130 may be provided in a position in which the optical interference between the light emitting modules can be reduced, and an optical signal of the light emitting module can be effectively received.
[39] The lower portion of the first support member 130 or the second support member 150 is coupled to a rear surface of the bottom cover 110 through the light emitting module 120 and the base 114 of the bottom cover 110.
[40] FIG. 2 is a view showing an example of the light emitting module according to the first embodiment.
[41] Referring to FIG. 2, the light emitting module 120 comprises the plural light emitting devices 125 arranged in at least one row along an X axis. The light emitting devices 125 may be arranged in the form of a matrix or a zigzag.
[42] The light emitting device 125 comprises color LED chips such as a red LED chip
126, a green LED chip 127, and a blue LED chip 128 installed in the form of one package or a chip on board (COB). The light emitting device 125 may comprise red/ green/blue LED chips intalled in their respective packages. In addition, the light emitting device 125 can be prepared by selectively combining various color LED chips and various phosphors. Hereinafter, the light emitting device 125 comprising the red, green, and blue LED chips 126, 127, and 128 will be described.
[43] In the light emitting device 125 mounted on the light emitting module 120, the color
LED chips 126, 127 and 128 are connected to each other in series and light is emitted as the color LED chips 126, 127 and 128 are individually or simultaneously driven. The above driving scheme may be changed according to the connection among the LED chips 126, 127 and 128. For instance, the color LED chips 126, 127 and 128 can be connected to each other in parallel or serial-parallel.
[44] At least one guide hole 121 is formed in the light emitting module 120 to support the lower portion of the support member. The guide hole 121 may comprise an oval shape, a circular shape, or a polygon shape. In addition, the guide hole 121 may comprise various shapes according to the shape of the lower portion of the support member.
[45] The light emitting module 120 may comprise a screw hole (not shown). The light emitting module 120 may be coupled to the bottom cover through the screw hole.
[46] FIG. 3 is a view showing another example the light emitting module 120 according to the first embodiment.
[47] Referring to FIG. 3, the light emitting module 120 comprises a structure in which a plurality of light emitting modules 120A, 120B, and 120C comprising the light emitting devices 125 are connected to each other. In other words, the light emitting module 120 comprising a bar shape may be employed.
[48] FIG. 4 is a side sectional view showing the first support member 130 according to the first embodiment, and FIG. 5 is a perspective view showing the first support member.
[49] Referring to FIGS. 4 and 5, the firs support member 130 may be molded by using a light transmissive material such as silicon or epoxy. The first support member 130 comprises a lower fixing part 131, a body 133 provided at the center portion of the first support member 130, and a head part 137.
[50] The lower fixing part 131 comprises an oval shape or a polygonal plate shape. In addition, the lower fixing part 131 may have various shapes according to fixture schemes. For example, the lower fixing part may comprise a fixture structure such as a locking structure, a hook structure, or a spiral structure.
[51] In the case of the locking structure, the lower fixing part 131 is inserted through the base of the bottom cover such that the lower fixing part 131 can be locked with the rear surface of the bottom cover when the first support member 130 rotates at a predetermined angle. In addition, if the lower fixing part 131 comprises the hook structure or the spiral structure, the lower fixing part 131 is hooked with the rear surface of the bottom cover or screw-coupled with the rear surface of the bottom cover.
[52] The body 133 is coupled to the lower fixing part 131 through an insertion boss 132.
The insertion boss 132 is formed between the body 133 and the lower fixing part 131 to support the first support member 130.
[53] Such a body 133 comprises a cylinder shape or a polygonal prism shape, and is provided therein with a sensor receiving groove 134. The color sensor 145 is received in the sensor receiving groove 134. The color sensor 145 may be realized by using a photodiode or a phototransistor capable of receiving at least one color light emitted from the light emitting device.
[54] The body 133 comprises a light transmissive material such as silicon or epoxy, or a lens. A portion of light incident on the body 133 from an exterior is incident on the color sensor 145.
[55] A lead line (not shown) of the color sensor 145 can be withdrawn to an exterior through an withdrawing hole 135 formed in the lower fixing part 131, and such a withdrawing structure of the lead line may be modified. The embodiment is not limited thereto.
[56] The head part 137 may comprise a pyramid shape or a funnel shape on the body 133.
The pyramid shape comprises a cone shape or a polygonal pyramid shape.
[57] The surface of the head part 137 is coated with a light non-transmissive material or a reflective material. The light non-transmissive material comprises white ink, and the reflect material comprises Ag.
[58] A bottom surface 140 provided from a lower end 139 of the head part 137 may comprise a flat shape, a concave shape, or a convex shape. The bottom surface 140 comprises a convex shape to reflect light, which is incident from an exterior, to the color sensor 145 of the body 133.
[59] The bottom surface 140 of the head part 137 may be inclined at a predetermined angle θl (e.g., 0 to 60°) with respect to a horizontally extension line of the lower end 139 of the head part 137, thereby increasing an amount of incident light. The angle θl and an interval Dl from the lower end 139 of the head part 137 may be variously changed according to the position of the color sensor 145, a light incidence angle and/ or an amount of light.
[60] Although it has been described that the head part 137 comprises a symmetrical cone shape, the head part 137 may comprise an asymmetric structure according to the array form of the light emitting devices. For example, the structure of the head part 137 in the first direction, which is an array direction of the light emitting devices, may be different from the structure of the head part 137 in the second direction perpendicular to the first direction.
[61] FIG. 6 is a side sectional view showing a display device 102 comprising the light source device according to the first embodiment. FIG. 7 is a view showing a light receiving structure of a color sensor of the first support member.
[62] Referring to FIG. 6, the display device 102 comprises the light source device 100 and a display panel 170.
[63] The light source device 100 comprises the bottom cover 110, the light emitting module 120, the first and second support members 130 and 150, the reflective sheet 116, and an optical sheet part 160. The light source device 100 comprises the optical sheet part 160 as compared with elements shown in FIG. 1. The light source device 100 having the above elements serves as a backlight unit.
[64] The guide groove 121 is formed at the bottom cover 110 and the light emitting module 120, and the first and second support members 130 and 150 are provided in the guide groove 121.
[65] The reflective sheet 116 is provided on the light emitting module 120 except for the light emitting device 125 and the guide groove 121. The reflective sheet 116 reflects light emitted from the light emitting device 125.
[66] The first and second support members 130 and 150 support the optical sheet part
160. In other words, the first and second support members 130 and 150 maintain a predetermined distance between the light emitting module 120 and the optical sheet part 160.
[67] The first support member 130 comprises a light transmissive material such as epoxy or silicon, and the second support member 150 comprises a light non-transmissive material such as polycarbonate.
[68] The optical sheet part 160 comprises at least one optical sheet. The optical sheet part
160 comprises a diffusion sheet (not shown) and a prism sheet (not shown). The diffusion sheet (not shown) diffuses incident light to improve the uniformity of the light. The prism sheet (not shown) comprises a horizontal prism sheet and/or a vertical prism sheet to refract or concentrate incident light, so that the brightness of the light can be improved. Such a prism sheet further comprises an illumination enhancement film (not shown).
[69] The display panel 170 is provided on the optical sheet part 160. The display panel
170 displays an image corresponding to an input image signal by using a light source generated from the light source device 100. Such a display panel 170 comprises two transparent substrates facing each other and a liquid crystal layer interposed between the substrates to adjust light transmittance according to an applied electric field. Such a display panel 170 is a kind of an LCD panel, and the display panel 170 may comprise a color filter or not. For example, according to a field sequential color (FSC) scheme, the display panel transmits red, green, and blue light onto the transparent substrate without the color filter to obtain an image signal. The embodiment may employ various display panels, and details thereof will be omitted.
[70] The lower fixing part 131 of the first support member 130 is fixed to the rear surface of the bottom cover 110 through the guide groove 121, the body 133 is provided on the light emitting module 120, and an upper end portion of the head part 137 supports a lower portion of the optical sheet part 160.
[71] A lower end of the body 133 of the first support member 13 is provided on the surface of the reflective sheet 116 or the surface of the light emitting module 120. [72] The color sensor 145 is fixed in the body 133 to receive light incident into a side surface of the first support member 130 and light reflected from the bottom surface 140 of the body 133. Accordingly, an amount of light incident onto the color sensor 145 may be increased.
[73] As shown in FIG. 7, the guide groove 121 is formed through the reflective sheet 116, the light emitting module 120, and the base 114 of the bottom cover.
[74] The head part 137 of the first support member 130 comprises the lower end 139 spaced apart from the reflective sheet 116 by a predetermined interval Dl, and the bottom surface 140 is convex with a predetermined angle θl with respect to a horizontal line. The color sensor 145 receives light incident between the first support member 130 and the reflective sheet 116 and light reflected from the reflective sheet 116.
[75] In this case, the color sensor 145 may comprise a predetermined directionality. For instance, the directionality represents the upward direction or lateral direction of the body 133.
[76] The second support member 150 comprises the form of a pin, and a lower end 151 of the second support member 150 is fixed to the rear surface of the bottom cover 110. A support part 153 of the second support member 150 is supported on the reflective sheet 116 or the light emitting module 120. A central upper end 155 of the second support member 150 supports the lower portion of the optical sheet part 160.
[77] The second support member 150 may comprise a shape identical to or different from that of the first support member 130. The embodiment is not limited thereto.
[78] According to the first embodiment, when each LED chip of the light emitting device
125 is driven in an initial stage, the red/green/blue LED chips of the light emitting module 120 can be sequentially turned on/off, and the driving current of the red/ green/blue LED chip of the light emitting module 120 can be controlled based on an optical signal detected from each color sensor 145. Accordingly, a color coordinate value in each region of the light emitting module 120 can be uniformly controlled.
[79] FIG. 8 is a plan view showing a light source device 200 according to the second embodiment, and FIG. 9 is a view showing a light receiving structure of a color sensor of a first support member of FIG. 8. Details of elements identical to those of the first embodiment will be omitted.
[80] Referring to FIG. 8, the light source device 200 comprises a bottom cover 210, a reflective sheet 216, light emitting modules 220, and first and second support members 230 and 250.
[81] The plural light emitting modules 220 are provided in the light source device 200, and the first support member 230 is provided in the vicinity of a center of the light emitting module 220. The first support member 230 detects optical information generated from each light emitting module 220.
[82] A l-A support member 230A may be further provided in the central region of the bottom cover 210 or the light emitting modules 220. The 1-A support member 230A can detect optical information of all light emitting modules 220. The first support member 230 and the 1-A support member 230A may be molded by using a light transmissive material such as silicon or epoxy.
[83] A color sensor of the first support member 230 detects optical information of each light emitting module 220, and a color sensor of the 1-A support member 230A detects optical information of the light emitting modules 220.
[84] In this case, the light emitting module 220 may have a width W2 wider than a width
Wl of the light emitting module 120 shown in FIG. 1. The first support member 230 may have various shapes corresponding to the width W2 of the light emitting module 220.
[85] The first support member 230 and the 1-A support member 230A comprise a shape shown in FIG. 9, and are provided therein with a color sensor 245. The color sensor 245 can receive the information of light incident in all directions except for a down direction.
[86] A connector 218 is provided in each light emitting module 220, and can be connected to a driver. The reflective sheet 216 may be provided on the light emitting module 220.
[87] Referring to FIG. 9, a guide groove 221 is formed corresponding to the reflective sheet 216, the light emitting module 220, and a base 214 of the bottom cover 210.
[88] A lower fixing part 231 of the first support member 230 is inserted into the guide groove 221 formed in the base 214 of the bottom cover 210. The lower fixing part 231 is rotated at a predetermined angle and then fixed. A lead line (not shown) of the color sensor 245 may be withdrawn to an exterior through a withdrawing hole 235 formed in the lower end part 231. Such withdrawing structure of the lead line may be changed, and the embodiment is not limited thereto.
[89] A head part 237 of the first support member 230 comprises a light transmissive material such as silicon or epoxy, and a central upper end 238 may comprise a cone shape or a polygon pyramid shape.
[90] The bottom surface of the head part 237 is provided on the reflective sheet 216 or the light emitting module 220. A lower end 239 may be coated with a light non- transmissive material by a predetermined height Hl. The lower end 239 coated with the non-transmissive material may be removed.
[91] A sensor receiving groove 243 is formed at a central lower portion of the head part
237, and the color sensor 245 is provided in the sensor receiving groove 243. The color sensor 245 receives light that has passed through the head part 237.
[92] The sensor receiving groove 243 is opened by a predetermined distance D2 from the left side of the head part 237, and the color sensor 245 is inserted and received into the sensor receiving groove 243 through the open structure. Such a receiving structure for the color sensor 245 may be formed when the first support member 230 is injection molded or the color sensor 245 may be inserted into the receiving structure from the exterior.
[93] Accordingly, each color sensor 245 can effectively detect light emitted from the light emitting devices 225 of the light emitting modules 220.
[94] According to the second embodiment, in the initial driving, the red/green/blue LED chips of the light emitting device 225 are sequentially turned on/off, and the driving currents of the red/green/blue LED chips of the light emitting module 220 are controlled based on optical signals detected from the color sensors 245, so that color coordinate values of the light emitting modules 220 can be uniformly controlled.
[95] According to the second embodiment, optical information about red/green/blue LED chips of all light emitting devices 225 is detected by using a color sensor installed in the 1-A support member 230A provide at the center portion of the bottom cover 210, thereby adjusting the color coordinate values of the entire area of the light source device 200.
[96] FIG. 10 is a block diagram showing a light source controlling device 300 employing the light source device according to the embodiment, and illustrates the control operation of the light source controlling device 300 for the light source device 100 shown in FIG. 1.
[97] Referring to FIG. 10, the light source controlling device 300 comprises N light emitting modules 320 provided with a light emitting device 325 and a color sensor 345, a controller 301, N drivers 302, and N analog-digital converters (ADCs) 303, and a memory 305.
[98] Each light emitting module 320 comprises the light emitting device 325 and a color sensor 345 mounted on the support member (130 of FIG. 3). The light emitting device 325 comprises red/green/blue LED chips mounted thereon in the form of a single package. The red/green/blue LED chips are sequentially turned on/off by a driving current. In this case, the color sensor 345 is installed in at least one support member provided in the light emitting modules 320. The support member supports an optical sheet part and a display panel.
[99] The ADC 303 converts red/green/blue optical signals, which have been detected by the color sensors provided in the light emitting modules 320, into digital signals and delivers the digital signals to the controller 301.
[100] The controller 301 obtains correction data for each color of the light emitting module 320 after comparing the optical signals detected from the color sensors 345 of the light emitting modules 320 with reference data stored in a memory 305. The memory 305 stores driving data and color coordinate information of the light emitting modules.
[101] The controller 301 outputs color correction data according to the optical signals to the driver 302. The driver 302 comprises switching elements (not shown). The driver 302 pulse- width modulates (PWM) the color correction data of the controller 301 to control the driving current of each color LED chip. Accordingly, the light emitting modules 320 output optical signals having predetermined color coordinates.
[102] The controller 301 calculates the average of color coordinate values of the N light emitting modules 320 by using the optical signals obtained from the light emitting modules 320. Then, the controller 301 calculates the difference between the average color coordinate value of the N light emitting modules 320 and a color coordinate value of a specific light emitting module 320. The brightness and the chromaticity of the specific light emitting module 320 can be compensated by using the difference between the color coordinate values.
[103] The controller 301 controls each color LED chip of each light emitting module 320 after comparing a reference color coordinate value stored in the memory 305 and a color coordinate value of an optical signal of each color detected by the color sensor 345 of each light emitting module 320.
[104] The controller 301 receives an optical signal for each color detected from the color sensor 345 of each light emitting module 320 and individually controls LED chips depending on the variation of a color characteristic of the LED chips in each module type according to time. In addition, it is possible to overcome a color shift phenomenon of the light source device derived from problem relating to a signal bar or module. When problems relating to a specific bar or module occur, the problems are fed-back to a user through a detection signal of a color sensor, so that a display state can be delivered to the user.
[105] In the embodiment employing a three primary color light emitting device as a light source, each color LED chip can independently be controlled after LED chips mounted on each module are sequentially driven and signals of light generated from the LED chips according to colors are detected.
[106] In addition, the controller 301 can control the brightness and the chromaticity of the light emitting modules in real time by using optical signals of the light emitting modules detected in real time.
[107] FIG. 11 is a flowchart showing the procedure of controlling a light source by the light source controlling device shown in FIG. 10.
[108] Referring to FIG. 11, if power is supplied in the initial stage in which the light source controlling device is driven (step SlOl), a driving current is sequentially supplied to LED chips mounted on N light emitting modules (step S 103). In other words, a red LED chip, a green LED chip, and a blue LED chip mounted on the light emitting device of the first light emitting module are sequentially driven. Thereafter, the LED chips according to colors are driven in the above sequence with respect to the Nth light emitting module from the second light emitting module.
[109] The LED chip for each color of the light emitting device mounted on each light emitting module is turned on/off (step S 105). According to the on/off state of the LED chips, the color sensor in the support member of the light emitting modules detects an optical signal (step S 107).
[110] The controller compares reference data with the detected optical signal to obtain color correction data for each light emitting module (step S 109). In addition, a current for an LED chip of each light emitting module is controlled based on the color correction data, thereby performing color correction (step Si l l).
[I l l] Then, after color correction for the light source device has been performed, all light emitting devices on a substrate are driven (step Sl 13).
[112] In other words, if power is supplied to a system, red/green/blue LED chips of a light emitting module are sequentially driven to perform color correction such that color coordinates can be maintained.
[113] According to the embodiments, color correction for a light emitting device is performed in the initial stage in a terminal such as a cellular phone or a portable computer, thereby ensuring uniform image quality of a display device. In addition, the light source device according to the embodiment may be used for a display device, an illumination device, and an indicating device.
[114] Accordingly, although embodiments of the present invention are described in detail, it must be noted that the embodiments are for the purpose of only description, but not the limitation thereof. In addition, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention. Industrial Applicability
[115] According to the embodiments, a module using a light emitting device is employed or a color sensor is provided on the module, thereby effectively detecting an optical property of each light emitting module. Accordingly, the chromaticity and the brightness of the module can be adjusted.
[116] According to the embodiments, the brightness and the chromaticity of a light emitting module can be controlled in real time.
[117] According to the embodiments, it is possible to compensate for the color shift of a light source according to the characteristic variation of a light emitting module.
[118] According to the embodiments, problems relating to colors of each light emitting module or all light emitting modules can be feedback to a user [119]

Claims

Claims
[1] A light source device comprising: a light emitting module comprising a light emitting device comprising a color
LED chip; a bottom cover below the light emitting module; an optical sheet part over the light emitting module; and a support member comprising a color sensor, in which the support member maintains a distance between the optical sheet part and the light emitting module.
[2] The light source device as claimed in claim 1, wherein the light emitting device comprises at least one of a red LED chip, a green LED chip, and a blue LED chip.
[3] The light source device as claimed in claim 1, wherein at least one support member comprising the color sensor is provided in the light emitting module.
[4] The light source device as claimed in claim 1, wherein the support member comprising the color sensor is provided in a vicinity of a center of the bottom cover or the light emitting module.
[5] The light source device as claimed in claim 1, wherein the support member is fixed to the bottom cover, and maintains the distance between the optical sheet part and the light emitting module.
[6] The light source device as claimed in claim 1, wherein the support member comprising the color sensor comprises: a head part; and a sensor receiving groove receiving the color sensor below the head part.
[7] The light source device as claimed in claim 1, wherein the support member comprising the color sensor comprises: a lower fixing part fixed to the bottom cover; a head part which supports the optical sheet part; and a body over the light emitting module and between the lower fixing part and the head part, in which the body comprises a sensor receiving groove receiving the color sensor.
[8] The light source device as claimed in claim 1, wherein the support member comprising the color sensor comprises a light transmissive material.
[9] The light source device as claimed in claim 7, wherein the head part has a pyramid shape and a surface coated with a light non-transmissive material, the body comprises a light transmissive material, and light incident between the head part and the light emitting module is transmitted in a lateral direction of the body and/or a upper direction of the head part so that the color sensor detects the light.
[10] The light source device as claimed in claim 1, wherein the light emitting module and the bottom cover comprise a guide groove, into which a lower portion of the support member is inserted, and the lower portion of the support member is coupled to a rear surface of the bottom cover through one of a hook structure, a spiral structure, and a locking structure.
[11] A display device comprising: a bottom cover having a case shape; a light emitting module provided in a bottom cover, which the light emitting module comprises a light emitting device comprising a color LED chip; and a first support member supported by the light emitting module, which the light emitting module comprises a color sensor emitted from the color LED chip.
[12] The display device as claimed in claim 11, comprising a second support member supported by the bottom cover.
[13] The display device as claimed in claim 11, wherein the light emitting device comprises at least one of a red LED chip, a green LED chip, and a blue LED chip.
[14] The display device as claimed in claim 11, wherein the first support member is provided in a vicinity of a center of the light emitting module or plural light emitting modules.
[15] The display device as claimed in claim 11, wherein the first support member comprises: a head part having a cone shape or a polygonal pyramid shape; and a sensor receiving groove which receives the color sensor below the head part.
[16] The display device as claimed in claim 11, comprising a reflective sheet provided over the light emitting module.
[17] The display device as claimed in claim 11, comprising an optical sheet part over the light emitting module; and a display panel over the optical sheet part, in which the first and second support members maintain a distance between the light emitting module and the optical sheet part.
[18] The display device as claimed in claim 11, wherein the first support member comprises a light transmissive material, and has at least a portion of surface of the first support member is coated with a reflective material used to reflect light.
[19] A light source controlling device comprising: light emitting modules comprising at least two color LED chips; an optical sheet part and a display panel over the light emitting module; a support member which maintains a distance between the light emitting module and the optical sheet part, in which the support member comprises a color sensor detecting light emitting from the color LED chips; an analog digital converter which converts an optical signal detected by the color sensor into a digital signal; a driver which controls a driving current of the color LED chip of the light emitting module; and a controller which receives the digital signal of the analog digital converter to output color correction data used to adjust color coordinate deviation of the light emitting modules.
[20] The light source controlling device as claimed in claim 19, wherein the controller obtains color coordinate deviation among the light emitting modules or deviation from a reference color coordinate value by using an optical signal detected by the color sensor, to output color correction data.
PCT/KR2008/002076 2007-04-16 2008-04-11 Light source device, control device thereof, and display device WO2008127050A1 (en)

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