CN101556006B - Backlight device and display device equipped with the same - Google Patents
Backlight device and display device equipped with the same Download PDFInfo
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- CN101556006B CN101556006B CN 200910134743 CN200910134743A CN101556006B CN 101556006 B CN101556006 B CN 101556006B CN 200910134743 CN200910134743 CN 200910134743 CN 200910134743 A CN200910134743 A CN 200910134743A CN 101556006 B CN101556006 B CN 101556006B
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Abstract
The present invention relates to a backlight device and a display device having the same. The backlight device for a non-self-luminous image display panel has a light-emitting area corresponding to a display area of the image display panel. The light-emitting area is arranged by combining a plurality of backlight substrates each of which is provided with a color sensor for detecting an incident light intensity and red, green, and blue LEDs whose respective light intensities are controlled in accordance with a detection result obtained by the color sensor. This arrangement allows reduction of brightness unevenness entirely in the light-emitting area of the backlight device.
Description
The application be that September 29, application number in 2006 are 200610141466.9 the applying date, denomination of invention divides an application for " backlight apparatus and possess the display unit of this device and the driving method and the method for adjustment of backlight apparatus ".
Technical field
The present invention relates to a kind ofly be applicable to that the downward back light modulation (Direct Type Backlight) such as the such non-emissive type image display panel of display panels installs and used the liquid crystal indicator of this backlight apparatus.The present invention has been particularly suited for adopting the backlight apparatus and the liquid crystal indicator that uses this backlight apparatus of led light source.
Background technology
(background technology of the 1st invention)
In the past, as the backlight of liquid crystal indicator, adopting with LED (Light EmittingDiode) was the LED-backlit lamp of light source.Because adopt the LED-backlit lamp, the control of brightness and colourity just becomes important problem.
Its reason is following, that is: the LED characteristics of luminescence of each element is different, and particularly each manufacturer's the LED characteristics of luminescence is different; Therefore; If different manufacturers' LED is used for a backlight, so, will produce because of different brightness disproportionations that cause in position and colourity inequality; In addition because LED is semiconductor element, so, even variations in temperature and through the time change, also can cause variation such as the characteristics of luminescence of luminous efficiency, peak luminous wavelength etc., the rate of change of each manufacturer's above-mentioned variation is also different.For this reason, people have considered various countermeasures, such as, use identical manufacturer's LED as far as possible, perhaps, select the consistent LED of characteristic for use, or the like.
So; Developed such technology, that is: in the LED-backlit lamp, carried color sensor (Color Sensor) and temperature sensor, through the signal of feedback from the sensor; Through control make brightness and the colourity of backlight become stable (for example; With reference to " LCD television set ' QUALIA use the LCD backlight ' wide colour gamut color rendering technological ", persimmon natural pond filial piety one youth, monthly magazine " デ イ ス プ レ イ (display) " in July, 2005 number).
On the other hand; Technology as the display color in the adjustment image display device; Known a kind of like this calibration system (Calibration System); On February 28th, 2002), the patent application Publication Laid-Open 2002-281531 of Japan communique (open day: on September 27th, 2002)) that is, detect the color of institute's picture displayed and it is adjusted (for example, with reference to the patent application Publication Laid-Open 2002-64842 of Japan communique (open day: by means of sensor.
(background technology of the 2nd invention)
In recent years, as the light source of employed backlight in the liquid-crystal apparatus, the exploitation of following dual mode is constantly being advanced; That is: adopt in the past cathode fluorescent tube (Cold CathodeFluorescent Light, below, be referred to as " CCFL ") and a part of light emitting diode (LightEmitting Diode simultaneously; Below; Be referred to as " LED ") mode, perhaps, CCFL all is replaced into the mode of LED.Especially, the trichromatic mode that only obtains RGB by means of LED compares to the mode of employing CCFL pipe in the past, and it has the big such characteristic of color reprodubility scope (NTSC than).Its reason is: the luminescent spectrum half breadth of LED is less, can obtain near the RGB of pure color of all kinds.In addition, can adjust brightness of all kinds, therefore, have the characteristic of the balance that can change color by means of the magnitude of current.In addition, owing to do not contain mercury, so, have the good characteristic of environmental-protecting performance.
Figure 25 (a) and Figure 25 (b) expression by No. 6439731 patent of the U.S. (Granted publication day: the employing that on August 27th, 2002) is disclosed the example of backlight apparatus of LED.Figure 25 (a) is the figure that observes from the rear side of device, and Figure 25 (b) is the figure that observes from the face side of device.In the face side of tellite 130, LED131 is assembled on the roughly whole surface.In addition, have brightness regulating circuit 132 and the semiconductor chip 133 that comprises driving and control circuit at the back side of tellite 130, LED131 is carried out drive controlling.Be provided with fin 134 at the back side of tellite 130, discharge effectively by the brightness regulating circuit 132 at the LED131 and the tellite back side and the heat of semiconductor chip 133 radiation.Thereby, fin 134 improves heat conductivility for closely being contacted with tellite 130; Recess 135 is set on fin 134, makes it possible to the brightness regulating circuit that the back side had 132 and the semiconductor chip 133 of tellite 130 are housed in the recess 135.In addition, be provided with diffusion sheet (DiffusionPlate) 136, be used for making light uniformization from LED131 in the face side of tellite 130.In addition, optical container 137 is accommodated above-mentioned fin 134, tellite 130 and diffusion sheet 136, possesses liquid crystal panel 138 in the front of this optical container 137, becomes the liquid crystal indicator as backlight with LED131 on the whole.
In addition, (open day: disclose a kind of like this LED-backlit lamp on October 10th, 2002), that is: the LED of use red, green, blue look and the optical sensor that detects red, green, blue three looks made the brightness of LED and the LED-backlit lamp of chroma stability at WO02/080625.At this, the LED lighting device is constituted as: except that above-mentioned LED and optical sensor, also possess memory array.Can color and the lumen output valve that the user sets be stored in the memory array,, can from above-mentioned memory, read above-mentioned value according to user's selection.
In addition, WO00/037904 (open day: disclosed a kind of like this backlight apparatus on June 29th, 2000), that is: an optical sensor has been carried out timesharing and drive, made brightness of all kinds and the backlight apparatus of chroma stability of the LED of red, green, blue look.
In addition; In the patent application Publication Laid-Open 2004-286971 of Japan communique (open day: disclose a kind of leaded light template backlight apparatus on October 14th, 2004); Utilization is set at four rgb light sources and four color sensors that are set at left and right end portions of the upper and lower end parts of viewing area, can obtain uniform colourity and brightness.In this backlight apparatus; The output of four light sources and four sensors is not corresponding one by one; Relatively sensor output and whole shared related data (Correlation Data) memory and light source benchmark luminous quantity memory are carried out matrix operation, thereby are carried out FEEDBACK CONTROL.
In addition; Communique (open day: disclose a kind of like this device on May 18th, 2006) is disclosed No. 2006103612 at U.S. Patent application; That is: in order to reduce current sinking and to absorb the characteristic deviation of LED; The driving voltage of LED of all kinds is stored in applies in the store voltages register, LED of all kinds is carried out device driven with driving voltage independently.The LED drive unit has: R (red) applies store voltages register, G (green) and applies that store voltages register, B (indigo plant) apply the store voltages register, R uses the dutycycle memory register with dutycycle memory register, G with dutycycle memory register, B.According to said structure and method, institute's stored voltage value applies independently minimum driving voltage to LED of all kinds in the store voltages device according to applying, and therefore, compares to the situation that LED of all kinds is applied identical driving voltage, can reduce current sinking.
Summary of the invention
(summary of the invention of the 1st invention)
But,, be difficult to fully suppress the brightness disproportionation and the uneven generation of colourity of integral image according to above-mentioned " the wide colour gamut color rendering technology of LCD television set ' QUALIA uses the LCD backlight ' " disclosed technical scheme.
Its reason is; According to technique scheme, above-mentioned color sensor is installed in the side of LED-backlit lamp, if adopt the color sensor configuration of this mode; Even detected the brightness and the colourity of integral image; Can not the brightness and the colourity of picture each several part be detected separately, that is, can not detect brightness disproportionation and colourity inequality.
In addition; The technology that the above-mentioned patent application Publication Laid-Open 2002-64842 of Japan communique, Japan's patent application Publication Laid-Open 2002-281531 communique are disclosed is the technology that is used to calibrate; Therefore, under the state that uses image display device usually, be difficult to carry out the control that is used to suppress brightness disproportionation and colourity inequality.
The present invention develops in view of the above problems, and its purpose is to realize a kind of like this backlight apparatus, is expected to reduce the whole brightness disproportionation of light-emitting zone that is:, and even more ideal is to be expected to reduce the uneven backlight apparatus of colourity.
To achieve these goals, backlight apparatus of the present invention is a kind of downward back light modulation device that is used for non-emissive type image display panel, it is characterized in that: have the light-emitting zone corresponding with the viewing area of above-mentioned image display panel; Above-mentioned light-emitting zone has disposed the optical detection part of the light quantity that detects incident light and the zonule of illuminating part constitutes by a plurality of, wherein, controls the luminous quantity of above-mentioned illuminating part according to the testing result of above-mentioned optical detection part.
In said structure; For each zonule in a plurality of zonules that constitute light-emitting zone; Detect the light quantity of the light incided this optical detection part by optical detection part, and control the luminous quantity that is configured in the illuminating part in the above-mentioned zonule according to the testing result of above-mentioned optical detection part.
Therefore, according to said structure, can light-emitting zone be divided into the zonule and the luminous quantity of each zonule is adjusted.
Its result can suppress the brightness disproportionation of each zonule in the light-emitting zone through adjustment, thereby is expected to reduce the whole brightness disproportionation of light-emitting zone.
The structure of display unit of the present invention does, has: above-mentioned backlight apparatus; And non-emissive type image display panel, come display image through control from the state that sees through of the light of above-mentioned backlight apparatus.
According to said structure, be expected to reduce the brightness disproportionation in the display frame.
(summary of the invention of the 2nd invention)
Recently, the someone has proposed the LED-backlit lamp is applied to the scheme of large-scale liquid crystal indicator.In this case,, will produce such problem, that is:, will cause tangible brightness or colourity uneven owing to the reasons such as non-uniform temperature in the substrate if merely enlarge the substrate that is provided with LED.Though can carry out correction to a certain degree to the variations in temperature in the substrate by means of the structure that has adopted optical sensor,, be difficult to eliminate whole brightness or colourity inequality.In addition, through substrate is cut apart, when a part breaks down, can make maintenance activity become easy to implement.Therefore, can consider to adopt through the formed backlight of the substrate that carries a plurality of LED of being provided with.
But, constituting under the situation of LED-backlit lamp by a plurality of substrates, exist the brightness or the colourity that are difficult to each substrate and be adjusted into identical brightness or the such problem of colourity.If above-mentioned adjustment is abundant inadequately, especially liquid crystal with backlight in, deviation will appear because of the viewing area is different in brightness or colourity.In addition, break down and when it is keeped in repair or change, man-hour it is adjusted so that itself and adjacent substrate carry out luminous uniformly with regard to needing cost at substrate.
Thereby the object of the present invention is to provide a kind of can the adjustment automatically to obtain uniformly luminous backlight apparatus, adopted the display unit of this backlight apparatus and the driving method of backlight apparatus so that the brightness of each substrate or colourity become predetermined value.
In addition, the present invention also aims to provide a kind of method of adjustment that constitutes the substrate of above-mentioned backlight apparatus.
Backlight apparatus of the present invention is a kind of like this backlight apparatus: have a plurality of substrates; The light-emitting component that above-mentioned each substrate possessed, optical sensor and memory; With the drive circuit of driven light-emitting element, wherein, above-mentioned each optical sensor is disposed on the substantial middle position of the lift-launch face that is equipped with above-mentioned each light-emitting component in above-mentioned each substrate; In the above-mentioned memory of above-mentioned each substrate, store the pairing information of output valve of sending the above-mentioned optical sensor under the condition of light of predetermined luminance or colourity at above-mentioned light-emitting component.
According to the invention described above; In the backlight apparatus that has possessed a plurality of substrates; The pairing information of output valve of in advance light-emitting component in the substrate being sent the optical sensor under the condition of light of predetermined luminance or colourity is stored in the memory in the substrate; Utilize above-mentioned information, the output valve execution standardization of optical sensor is handled.Light-emitting component in each substrate is implemented FEEDBACK CONTROL so that the output valve of above-mentioned standardized optical sensor is consistent with the setting value of brightness or colourity.So aforesaid substrate does not receive the influence of the deviation of optical sensor, therefore, can realize a kind ofly need not to adjust and only just obtaining uniform luminous backlight apparatus through the combination aforesaid substrate.Thus, in backlight apparatus, when substrate breaks down, only need change the substrate that possesses the memory of having stored above-mentioned information, just can make a plurality of substrates after substrate is changed, also send brightness or the uniform light of colourity.
The structure of display unit of the present invention does, has: above-mentioned backlight apparatus; And non-emissive type image display panel, come display image through control from the state that sees through of the light of above-mentioned backlight apparatus.
In addition, according to foregoing invention,, can realize the display unit that a kind of display quality is excellent through above-mentioned backlight apparatus and the non-emissive type image display panel that makes up even function admirable.
The present invention provides a kind of driving method of backlight apparatus, and this backlight apparatus has: a plurality of substrates; The light-emitting component that above-mentioned each substrate possessed, optical sensor and memory; Drive circuit with driven light-emitting element; Wherein, Above-mentioned each optical sensor is disposed on the substantial middle position of the lift-launch face that is equipped with above-mentioned each light-emitting component in above-mentioned each substrate; In above-mentioned memory, store light-emitting component that aforesaid substrate possesses and send the pairing information of output valve of the above-mentioned optical sensor under the condition of light of predetermined luminance or colourity, above-mentioned driving method comprises: the step of the above-mentioned light-emitting component of above-mentioned driving circuit drives; And above-mentioned control circuit makes the outputting standardization of above-mentioned optical sensor according to canned data in above-mentioned memory; Above-mentioned drive circuit is generated and sent control signal, make the output and brightness that is set or the consistent step of colourity of above-mentioned standardized optical sensor.
According to the invention described above, can realize a kind of driving method of above-mentioned backlight apparatus of even function admirable.
The present invention provides a kind of method of adjustment of backlight apparatus; This backlight apparatus has a plurality of substrates; Aforesaid substrate possesses light-emitting component, optical sensor and memory; This method of adjustment comprises: the 1st step, drive above-mentioned light-emitting component, and detect by the luminous quantity of the shared in fact external light sensor of above-mentioned each substrate above-mentioned light-emitting component; The 2nd step is come a reference value of the optical sensor output of computing expection by the output of above-mentioned optical sensor; And the 3rd step, a reference value of above-mentioned optical sensor output is stored in the above-mentioned memory, above-mentioned each substrate is carried out above-mentioned the 1st step, the 2nd step and the 3rd step.
According to the invention described above, a kind of method of adjustment that can directly enclose the substrate in the backlight apparatus can be provided.
It is very clear that other purposes of the present invention, feature and advantage can become in the following description.In addition, come clear and definite advantage of the present invention with reference to accompanying drawing below.
Description of drawings
Fig. 1 (a) is the plane of the liquid crystal indicator of expression the 1st working of an invention mode 1, and Fig. 1 (b) is the side view of the above-mentioned liquid crystal indicator of expression.
Fig. 2 (a) is the backlight of the above-mentioned liquid crystal indicator of expression and the plane of inner basket, and Fig. 2 (b) is the side view of backlight, inner basket and the backlight lamp control circuit of the above-mentioned liquid crystal indicator of expression.
Fig. 3 is the plane of the structure of the expression backlight unit that above-mentioned liquid crystal indicator possessed.
Fig. 4 is the stereogram of state that the above-mentioned backlight unit of expression is equipped on the inside basket of above-mentioned liquid crystal indicator.
Fig. 5 is the plane of the configuration of the expression backlight substrate that constitutes above-mentioned backlight unit.
Fig. 6 is used to explain through making up the figure that above-mentioned backlight substrate can constitute the backlight of the light-emitting zone with various sizes.
Fig. 7 is the chart of the expression picture dimension and the sheet number of the backlight substrate that is used to constitute picture dimension.
Fig. 8 is used for explaining the plane in the position of backlight substrate color sensor.
Fig. 9 is the profile of liquid crystal cells, backlight, inner basket and the backlight lamp control circuit of the above-mentioned liquid crystal indicator of expression.
Figure 10 is that expression is by the plane of resin-sealed redness, green and blue led.
Figure 11 is the plane of the ios dhcp sample configuration IOS DHCP of expression redness, green and blue led.
Figure 12 is the plane of structure of the backlight unit that liquid crystal indicator possessed of expression the 1st working of an invention mode 1.
Figure 13 is a sketch map of observing the liquid crystal indicator of the 2nd working of an invention mode 1 from the back side.
Figure 14 (a) and Figure 14 (b) are the sketch mapes of the piece (Tile) in the backlight apparatus of the 2nd working of an invention mode 1.
Figure 15 is the profile of the piece in the backlight apparatus of the 2nd working of an invention mode 1.
Figure 16 is the profile of the piece in the backlight apparatus of the 2nd working of an invention mode 1.
Figure 17 (a) and Figure 17 (b) are the sketch mapes of the signal stream of expression the 2nd working of an invention mode 1.
Figure 18 is the adjusting device of the piece in the backlight apparatus of the 2nd working of an invention mode 1.
Figure 19 (a) and Figure 19 (b) are the front elevation and the back views of the piece in the backlight apparatus of the 2nd working of an invention mode 2.
Figure 20 is the adjusting device of the piece in the backlight apparatus of the 2nd working of an invention mode 2.
Figure 21 is the profile of the piece in the backlight apparatus of the 2nd working of an invention mode 3.
Figure 22 is the profile of the piece in the backlight apparatus of the 2nd working of an invention mode 3.
Figure 23 is the front schematic view of piece in the backlight apparatus of expression the 2nd working of an invention mode 3.
Figure 24 is the adjusting device of the piece in the backlight apparatus of the 2nd working of an invention mode 3.
Figure 25 (a) and Figure 25 (b) are the liquid crystal indicators that has adopted the backlight apparatus of prior art.
The specific embodiment
(the 1st working of an invention mode 1)
Below, with reference to Fig. 1～Figure 11 embodiment 1 of the present invention is described.
The schematic configuration of the liquid crystal indicator (display unit) 1 of this embodiment at first, is described according to Fig. 1 (a) and Fig. 1 (b).Liquid crystal indicator 1 has liquid crystal cells 2, backlight 3, inner basket 4, backlight lamp control portion (control part) 5, driving and power circuit 6, disposes above-mentioned liquid crystal cells 2, backlight 3, inner basket 4, backlight lamp control portion (control part) 5, driving and power circuit 6 successively from face side to the rear side of liquid crystal indicator 1.
In the inscape of above-mentioned liquid crystal indicator 1, liquid crystal cells 2 and driving and power circuit 6 can adopt liquid crystal cells and the driving and the power circuit of prior art.
That is, liquid crystal cells 2 has the substrate of a pair of holding liquid crystal material, and, have the colour filter (Color Filter) that is set at aforesaid substrate, light polarizing film etc.Drive and power circuit 6, to liquid crystal cells 2 and backlight lamp control portion 5 supply be used to the power that makes it to move and be used for to the signal controlled of enforcements, thus, entire liquid crystal display device is driven and controls.
Then, backlight 3 and backlight lamp control portion 5 in this embodiment are described.
3 pairs of liquid crystal cells 2 as non-spontaneous type image display panel of backlight are supplied with white light, and its structure is: on substrate, carried a plurality of light-emitting components.
Of the back, the backlight 3 in this embodiment is to form through making up a plurality of substrates that carried light-emitting component.And, in advance the light-emitting component that is carried on each substrate is adjusted, so that its brightness and colourity become predetermined value.
But, when when the combination aforesaid substrate and according to identical setting the light-emitting component of each substrate being lighted, Luminance Distribution and colourity will take place in the viewing area of liquid crystal cells 2 distribute.Briefly, its reason is: in the zone of the zone of the substrate of the middle body that is configured in liquid crystal cells 2 and the substrate of the peripheral part that is configured in liquid crystal cells 2, from around condition and the temperature conditions etc. of light of incident there are differences.
To this; In the backlight 3 of this embodiment,, utilize sensor to come sensed luminance and colourity for above-mentioned each substrate; And adjust automatically so that become predetermined brightness and colourity; Thus, suppress the brightness disproportionation and the colourity inequality of the whole viewing area of liquid crystal cells 2, thereby make brightness and colourity homogenising.
In addition; When using above-mentioned backlight 3; Will take place variation in temperature distribution and environment temperature in the viewing area of liquid crystal cells 2 variation, each light-emitting component luminosity through the time change, between the light-emitting component above-mentioned through the time difference that changes etc., above-mentioned factor will cause the brightness disproportionation and colourity inequality of above-mentioned whole viewing area.
To this, in the backlight 3 of this embodiment, in the use of liquid crystal indicator 1, also utilize sensor to adjust so that become predetermined brightness and colourity, thus, it is uneven to suppress brightness disproportionation and colourity.
For this reason, the backlight in this embodiment 3 has following structures with backlight lamp control portion 5.
Shown in Fig. 2 (a) and Fig. 2 (b), the backlight 3 in this embodiment is not to be made up of single substrate, but is made up of a plurality of backlight substrates 31, and backlight substrate 31 has and is the size that waits the viewing area 2 of branch liquid crystal cells 2 rectangularly.Above-mentioned a plurality of backlight substrate 31 is on the face of the face side that is fixed on inner basket 4 rectangularly.
The light-emitting component of 5 pairs of backlights 3 of backlight lamp control portion is implemented control, its by a plurality of control substrates 51 be equipped on the control circuit of respectively controlling on the substrate 51 and constitute, wherein, a plurality of control substrates 51 are provided with backlight substrate 31 accordingly.
In following explanation, backlight substrate 31 and control substrate 51 are structures one to one.In this case, each other corresponding backlight substrate 31 with control substrate 51 and be connected via the peristome that is formed on inner basket 4 (not shown) and through flexible wiring etc.The advantage of said structure is: backlight substrate 31 becomes short and sweet with the corresponding relation of control substrate 51, and the distribution length that connects between the two shortens, and therefore, is not vulnerable to The noise, and the S/N ratio of signal is improved.
But, need dispose other circuit, be difficult to realize above-mentioned structure sometimes in the rear side of inner basket 4.
Can make various changes to the configuration of above-mentioned control substrate 51, also can it be divided into a plurality of control substrates 51 ground and constitute backlight lamp control portion 5.
Constitute downward back light modulation device 7 of the present invention by backlight 3 with backlight lamp control portion 5; In above-mentioned downward back light modulation device 7, by one group of backlight substrate 31 of above-mentioned mutual correspondence and control substrate 51 with its on the structure that constitutes of the circuit key element of being carried be called as backlight unit 71 (with reference to Fig. 3).
In addition, downward back light modulation device is meant, the viewing area of the non-emissive type image display panel such such as liquid crystal cells 2 inboard under be set up in parallel the backlight apparatus of a plurality of light sources.
According to Fig. 3, further specify the detailed structure of backlight unit 71.In addition, in Fig. 3, illustrate backlight substrate 31 and control substrate 51 in the plane side by side; But; As shown in Figure 4, when backlight substrate 31 and control substrate 51 being carried, backlight substrate 31 and the inner basket of control substrate 51 clampings 4 ground are carried to inner basket 4.
Near the central authorities of backlight substrate 31, be equipped with color sensor (optical detection part) 31a.The light quantity of the redness of the light of its position of color sensor 31a detection arrival, green, blue composition, and 3 channel signals (Three-channel Signal) of each light quantity of output expression.
According to said structure; Light with each backlight substrate 31 corresponding zones are mainly sent by the red LED, green LED and the blue led that are carried on each backlight substrate 31 in the viewing area of liquid crystal cells 2 throw light on, and the color sensor 31a that is carried by means of each backlight substrate 31 detects above-mentioned zone is implemented redness, the green of the light of illumination, the average light quantity of blue composition.
On the other hand, control substrate 51 bases are controlled the luminous quantity of redness, green and the blue led of pairing backlight substrate 31 by the light quantity of detected each colour content of color sensor 31a of pairing backlight substrate 31.
A/D converter section 51a converts the analog signal (signal of representing the light quantity of each colour content) of 3 passages of color sensor 31a output into data signal, and with its input light quantity operational part 51b.
Light quantity operational part 51b; According to the signal of being imported; And, with reference to being stored in the related data among the related data memory 51d, thus; The luminous quantity separately (prediction luminous quantity) of the redness of definite prediction, green, blue led is predicted expression the signal of luminous quantity outputs to controlled quentity controlled variable operational part 51c.
In addition; The above-mentioned related data that is stored among the related data memory 51d is expression by the data of the check table (Look-up Table) of the dependency relation between the prediction luminous quantity of the light quantity of detected each colour content of color sensor 31a and redness, green, blue led; Wherein, above-mentioned dependency relation is to obtain through experiment in advance.
Controlled quentity controlled variable operational part 51c; The prediction luminous quantity separately of the redness of relatively confirming, green, blue led and be stored in the benchmark light quantity data among the benchmark light quantity data storage 51e by light quantity operational part 51b; The computing controlled quentity controlled variable consistent of luminous quantity separately of redness, green, blue led of sening as an envoy to the benchmark luminous quantity, and will represent that the signal of this controlled quentity controlled variable outputs to LED drive division 51f.
In addition, the above-mentioned benchmark light quantity data that are stored among the benchmark light quantity data storage 51e are that expression is red, green, the data of a reference value of the luminous quantity separately of blue led.
In addition; Backlight lamp control portion 5 is connected on driving and the power circuit 6; By drive and power circuit 6 to backlight control part 5 supply powers, and, (respectively control the common control of substrate 51 by means of the integral body control that drives and power circuit 6 is implemented backlight lamp control portions 5; For example, the change of the whole light quantity of picture etc.).
As shown in Figure 5, above-mentioned backlight unit 71 is configured to rectangular, thus, realized the light-emitting zone corresponding with the viewing area of liquid crystal cells 2.
In addition, here, backlight substrate 31 is the 144mm of vertical 81mm * laterally, and vertical 7 row * horizontal 7 row ground configurations amount to 49 above-mentioned backlight substrates 31, thereby has realized the pairing light-emitting zone in 46 type viewing areas of 1018mm of vertical 573mm * laterally.In addition; On each backlight substrate 31, vertical 4 row * horizontal 7 are equipped with being listed as and amount to 28 groups of redness, green, blue led group (in Fig. 4, for the purpose of simplifying the description; Less illustrate the quantity of redness, green, blue led group), and be equipped with a color sensor 31a.Above-mentioned concrete numeral is an example, can carry out various changes.
As stated; Backlight 3 has the light-emitting zone corresponding with the viewing area of liquid crystal cells 2 (in Fig. 5; Disposed the zone of backlight substrate 31) vertical 7 row * horizontal 7 row; Above-mentioned light-emitting zone has disposed color sensor 31a and according to the zonule of the redness of the testing result of this color sensor 31a control luminous quantity, green, blue led (in Fig. 5, the zone corresponding with each backlight substrate 31) formation by a plurality of.
Thus, in each above-mentioned zonule, can detect light quantity by color sensor 31a, and control the luminous quantity of redness, green, blue led according to its testing result.
As stated, control so that the benchmark light quantity data consistent of storing among the luminous quantity of redness, green, blue led and the benchmark light quantity data storage 51e.Therefore, if in each backlight substrate 31, unify benchmark light quantity data in advance, just can in whole light-emitting zone, make the brightness of above-mentioned zonule roughly even.That is to say, can suppress the brightness disproportionation of each zonule in the light-emitting zone through adjustment, thereby be expected to reduce the brightness disproportionation of whole light-emitting zone.
In addition; Color sensor 31a detects the light quantity of the redness of the light that arrives its position, green, blue composition; Red, green, blue led are implemented control so that luminous quantity separately is consistent with the benchmark luminous quantity; So, can the colourity of above-mentioned colour mixture be adjusted into by the determined colourity of benchmark luminous quantity of all kinds.Therefore, be expected to reduce brightness disproportionation and colourity inequality.
In addition, also can only reduce brightness disproportionation, in this case, owing to need not light quantity red, green, blue composition is detected, so the sensor that use can detect the whole light quantity of visible light replaces color sensor 31a to get final product.
In addition; Above-mentioned light-emitting zone by a plurality of disposed color sensor 31a and constituted according to the zonule of the redness of the testing result of this color sensor 31a control luminous quantity, green, blue led get final product, so, may not cut apart so that corresponding substrate with above-mentioned zonule; But; If divide cutting board so that corresponding with the zonule, so, as shown in Figure 6; Through the substrate (backlight substrate 31) of combination same structure, can more easily constitute the backlight of light-emitting zone with various sizes.
In addition, the shape of backlight substrate 31 preferably with the shape shapes similar of light-emitting zone.Light-emitting zone is corresponding with the viewing area of image display panel; The shape of viewing area is generally rectangular shape; And its aspect ratio is fixed, therefore; Form the shape shapes similar with the viewing area through shape, can relatively easily constitute the light-emitting zone corresponding with the viewing area of various sizes with each backlight substrate 31.
In addition, the preferably vertical 81mm of the size of backlight substrate 31 * horizontal 144mm.If adopt this size; Then as shown in Figure 7; Through vertically, transversely disposing the above-mentioned backlight substrate 31 of integer sheet, just can constitute the backlight that has with the light-emitting zone of the roughly corresponding size in the viewing area of typical sizes (13,15,20,26,32,37,40,42,45,46,52,57,58,59,65 inches).
In addition; Size as backlight substrate 31; Can the lateral dimension of above-mentioned size be reduced half and make it to become vertical 81mm * horizontal 72mm; Perhaps, longitudinal size increased be twice and make it to become the 144mm of vertical 162mm * laterally, thereby backlight substrate 31 is formed more near foursquare shape.In addition, it is also conceivable that, in addition, it is also conceivable that various sizes such as the size of vertical 81mm * horizontal 48mm.
In above-mentioned explanation, be configured to prerequisite and set forth so that backlight substrate 31 is gapless each other, still, certainly, the also also nonessential configuration of carrying out above-mentioned that kind can be provided with gap in can not producing the uneven scope of colourity and is configured.
Preferably, color sensor 31a detects the state of the average light of above-mentioned zonule.For this reason, preferably, color sensor 31a is configured in the approximate centre position of redness that each backlight substrate 31 carried, green, blue led.Particularly, preferably as shown in Figure 8, color sensor 31a is configured in the approximate centre position (in Fig. 8) of backlight substrate 31 by the position shown in "+".For this reason, be and dispose redness, green, blue led group (in Fig. 8) rectangularly, exist redness, green, the blue led group of equal number to get final product in the front and back of the line direction of matrix and the color sensor 31a on the column direction by the part that dotted line surrounded.In addition, when line number or columns were odd number, the difference of the redness that exists in the front and back of color sensor 31a, green, blue led group can be 1.
Then, come at length to explain backlight substrate 31 and the circuit key element of being carried on it according to Fig. 9.In addition, Fig. 9 has represented the profile of liquid crystal cells 2, backlight 3, inner basket 4 and backlight lamp control portion 5.Below, when not distinguishing the glow color of redness, green, blue led especially, be referred to as " LED31b ".
Structure shown in Figure 9 is: for the temperature that suppresses LED (illuminating part, light-emitting component, semiconductor light-emitting elements) 31b as much as possible rises, be diffused in the heat that produces among the LED31b effectively.Particularly; The base material 31c that use is made up of the higher material of thermal conductivity of aluminium etc.; On the surface of base material 31c, form the wiring graph 31e that thermal conductivity and the higher material of conductance by copper etc. constitute; Across the thin insulating barrier 31d that forms by resin etc., thus, constitute backlight substrate 31 between between base material 31c and the wiring graph 31e.On above-mentioned wiring graph 31e, carry the LED31b of single wire type (One WireType).And then, base material 31c is installed so that the inside basket 4 that the back side contact that base material 31c is installed is formed by the higher material of thermal conductivity of aluminium or stainless steel etc.
In addition; In the LED31b of single wire type, the bottom surface that constitutes the semiconductor substrate of LED becomes an electrode, so; This bottom surface is directly contacted with wiring graph 31e; Thereby can realize being electrically connected, therefore, only connect another electrode and the wiring graph 31e that are formed on the face relative through lead-in wire and get final product with the bottom surface of semiconductor substrate.
According to said structure, the heat that LED31b produced can spread to the bigger inside basket 4 of thermal capacitance via the higher wiring graph 31e of thermal conductivity, thin insulating barrier 31d and the higher base material 31c of thermal conductivity effectively.
In addition, in structure shown in Figure 9,, adopt the semiconductor substrate that constitutes by carborundum (SiC) or gallium nitride (GaN) etc. as the semiconductor substrate of the semiconductor light-emitting elements that constitutes LED31b, and, utilize the resin of light transmission that it is sealed.Under the situation that semiconductor substrate is made up of SiC or GaN etc.; Its refractive index deviation occurs because of measuring condition is different, still, because the refractive index of SiC and GaN is higher; Be respectively 3.09 and 2.48; Therefore, the difference of the refractive index between itself and the air is bigger, sees through semiconductor substrate and the light that is radiated outside tails off.So, be under the situation of SiC substrate or GaN substrate at semiconductor substrate, preferably, (if light can pass through, translucent resin also can have color with translucent resin 31g.Nearly all translucent resin all belongs to this type of) it is sealed, wherein, the refractive index of this translucent resin 31g is between the refractive index of refractive index and air of semiconductor substrate.
In said structure; Behind the light transmission semiconductor substrate that sends by the luminescent layer of semiconductor light-emitting elements to external radiation; Through translucent resin 31g is set on this light path, can carry out by stages from semiconductor substrate to the change of refractive of outside (air).Therefore, on above-mentioned light path, can make more light radiation, thereby improve the utilization ratio of light to outside.
In addition, with the refractive index of semiconductor substrate irrespectively, through the sealing of translucent resin 31g, can prevent in assembling operation or test jobs, to take place to the unexpected Mechanical Contact of LED31b etc.
In addition, can use translucent resin 31g packaged LED 31b singly, shown in figure 10, also can seal a redness, green, blue led group in the lump, also can seal two or more redness, green, blue led group in the lump.But; If the unit of sealing is too big in the lump, so, backlight substrate 31 will be covered by translucent resin 31g on a large scale; Translucent resin 31g just possibly come off from backlight substrate 31 because of the expansion rate difference between backlight substrate 31 and the translucent resin 31g; Therefore, preferably, seal a redness, green, blue led group in the lump.
In addition, in structure shown in Figure 9, on the lift-launch face of LED31b, implemented silver-plated 31h.
According to said structure, by means of silver-plated 31h, the luminescent layer that can reflect effectively by semiconductor light-emitting elements sends and sees through the light of semiconductor substrate to the lift-launch face side radiation of this semiconductor light-emitting elements.Therefore, can be radiated outside effectively, thereby improve the utilization ratio of light to the light of the lift-launch face side radiation of semiconductor light-emitting elements.
In addition; Be under the situation of the crystalline substrate that constitutes by sapphire etc. at the substrate of semiconductor light-emitting elements; If also on the lift-launch face of this semiconductor light-emitting elements, implemented silver-plated 31h; So, by means of silver-plated 31h, the luminescent layer that can reflect effectively by semiconductor light-emitting elements sends and sees through the light of above-mentioned crystalline substrate to the lift-launch face side radiation of this semiconductor light-emitting elements.Therefore, be that it also is effective that silver-plated 31h is set under the situation of the crystalline substrate that is made up of sapphire etc. at the substrate of semiconductor light-emitting elements.
In addition, preferably, silver-plated 31h is also covered by translucent resin 31g.Thus, can prevent the oxidation of silver-plated 31h, thereby keep high reflectance for a long time.In addition, for anti-oxidation, also can replace the silver-plated 31h that constitutes by silver-colored monomer with silver alloy.
And then, preferably, on the surface of backlight substrate 31, implement reflectivity and improve processing.So-called reflectivity improves to be handled, and means the processing of the surface of further raising backlight substrate 31 to the reflection of light rate, for example, realizes this processing through resin that applies white or the thin slice that attaches high reflectance.In addition, in order not hinder being electrically connected between the wiring graph 31e on LED31b or color sensor 31a and the backlight substrate 31, and the loading position of LED31b and color sensor 31a is not applied the resin of white or attach the thin slice of high reflectance.In addition, because the temperature of backlight substrate 31 uprises, so, when applying the resin of white, preferably adopt stable on heating white resin.
According to said structure, can reduce the loss of the light of backlight substrate 31 sides, therefore, can improve utilization ratio from the light of LED31b.
In addition, in structure shown in Figure 9, color sensor 31a has the light shielding part 31i of the direct incident of light that is used to prevent that LED31b from sending.
According to said structure; Incident is (for example indirectly for the light that LED31b sends; By the light incident of the scatterings such as diffusion sheet 2a that are provided with in liquid crystal cells 2, the particularly liquid crystal cells 2), therefore, can under the state of the more approaching light of observing via liquid crystal cells 2, detect.
In addition; In this embodiment,, red, green, blue led have been adopted as the light-emitting component that is carried on the backlight substrate 31; But; Also can one of which partly or entirely be replaced into following light-emitting component, that is: the light source through combination LED etc. with absorb light that this light source sends and the fluorophor that sends the longer light of this light wavelength of wavelength ratio, thereby send the light-emitting component of the light of predetermined color.
Below, enumerate the concrete example of the light-emitting component that is carried on the backlight substrate 31.As green and blue light emitting device; Can consider on the sapphire substrate GaN class light-emitting component, the GaN class light-emitting component on the SiC substrate, peel off on the SiC substrate Grown GaN class luminescent layer and attach element of other members (for example, Si etc.) etc. from the SiC substrate.As red light-emitting component, can consider on the GaAs substrate AlGaInP class light-emitting component, peel off the AlGaInP class luminescent layer of growing and attach element of other members (for example, Si etc.) etc. from the GaAs substrate at the GaAs substrate.
In addition, as the configuration of the redness on the backlight substrate 31, green, blue led, as shown in Figure 3; Set and configuration are red, green, the blue led group, in addition, it is also conceivable that various configurations; For example, shown in figure 11, be respectively and dispose redness, green, blue led bandedly.
(the 1st working of an invention mode 2)
Below, according to Figure 12 embodiment 2 of the present invention is described.
Compare with above-mentioned embodiment 1; The difference of this embodiment is mainly: on backlight substrate 31, append temperature sensor 31j is set; On control substrate 51, append temperature characterisitic data storage 51g is set; And, in each functional block on control substrate 51, control according to the testing result of color sensor 31a and the testing result of temperature sensor 31j.
Therefore, below, above-mentioned difference mainly is described.To have with embodiment 1 in the inscape of the corresponding function of inscape give identical label.
On backlight substrate 31, be equipped with temperature sensor 31j.Temperature sensor 31j detects the temperature of the backlight substrate 31 of its position, and the signal of detected temperature is represented in output.
The analog signal (signal of representing detected temperature) of temperature sensor 31j output is converted into data signal by A/D converter section 51a, and is transfused to controlled quentity controlled variable operational part 51c.
Controlled quentity controlled variable operational part 51c; At first; According to by detected temperature of temperature sensor 31j and the temperature characterisitic data that are stored in redness among the temperature characterisitic data storage 51g, green, blue led; The controlled quentity controlled variable that computing is corresponding with detected temperature, and will represent that the signal of this controlled quentity controlled variable outputs to LED drive division 51f.
In addition, the above-mentioned temperature characterisitic data that are stored among the temperature characterisitic data storage 51g are data of the pairing controlled quentity controlled variable of the various detected temperatures of expression.The characteristics of luminescence red, green, blue led changes according to its temperature, and situation of change red, green, blue led also has nothing in common with each other.Therefore; About all temps; The controlled quentity controlled variable of obtaining the benchmark separately that becomes redness, green, blue led in advance (is current value when driving according to current signal; Be pulse width when driving according to pwm signal), and with its as the temperature characterisitic storage in temperature characterisitic data storage 51g.Utilize the said temperature performance data to implement above-mentioned control, thus, can luminous quantity separately red, green, blue led be controlled to be desired state.
Afterwards; With embodiment 1 likewise; Relatively by the prediction luminous quantity separately of the specific redness of light quantity operational part 51b, green, blue led be stored in the benchmark light quantity data among the benchmark light quantity data storage 51e; Computing is used to make the controlled quentity controlled variable consistent with the benchmark luminous quantity of luminous quantity separately of redness, green, blue led, and will represent that the signal of this controlled quentity controlled variable outputs to LED drive division 51f.Thus, can control the luminous quantity separately of redness, green, blue led more accurately.
As stated; In this embodiment; On each backlight substrate 31, be equipped with the temperature sensor 31j of the temperature that is used to detect this substrate; About redness, green, the blue led that on each backlight substrate 31, carries,, the luminous quantity of above-mentioned redness, green, blue led is implemented control according to the testing result of the temperature sensor 31j that on same substrate, carries.
According to said structure, can on the basis of the situation that the luminance of considering red, green, blue led changes according to the variations in temperature of backlight substrate 31, carry out the control of luminous quantity.
In addition, on each backlight substrate 31, can also carry the nonvolatile memory (ROM etc.) of the characteristic that has write down the redness that this substrate carried, green, blue led.In red, green, blue led; Luminous quantity reduces along with the rising of temperature; And; The color of the light that sends changes (variation of emission wavelength), the above-mentioned variation of each monomer have nothing in common with each other (difference owing to the difference between the manufacturer, between in batches, the difference in the same batch etc.).For this reason, obtain information through test in advance, and this information is stored in the above-mentioned nonvolatile memory, carry out reference when stating control on the implementation, thus, can control more accurately about above-mentioned property difference.
As stated; Backlight apparatus of the present invention is a kind of downward back light modulation device that is used for non-emissive type image display panel; Have the light-emitting zone corresponding with the viewing area of above-mentioned image display panel; Above-mentioned light-emitting zone has disposed the optical detection part of the light quantity that detects incident light and the zonule of illuminating part constitutes by a plurality of, wherein, controls the luminous quantity of above-mentioned illuminating part according to the testing result of above-mentioned optical detection part.
In said structure; For each zonule in a plurality of zonules that constitute light-emitting zone; Detect the light quantity of the light incided this optical detection part by optical detection part, and control the luminous quantity that is configured in the illuminating part in the above-mentioned zonule according to the testing result of above-mentioned optical detection part.
Therefore, according to said structure, can light-emitting zone be divided into the zonule and the luminous quantity of each zonule is adjusted.
Its result can suppress the brightness disproportionation of each zonule in the light-emitting zone through adjustment, thereby is expected to reduce the whole brightness disproportionation of light-emitting zone.
Backlight apparatus of the present invention preferably; In said structure; Above-mentioned optical detection part detects the light quantity of each color component in the multiple color component, and the luminous quantity of each color component in the multiple color component of above-mentioned illuminating part is controlled.
In said structure, optical detection part detects the light quantity of each color component in the multiple color component, and the luminous quantity of each color component in the multiple color component of above-mentioned illuminating part is controlled.
Therefore, according to said structure, can in each zonule, adjust the colourity of luminous quantity and the light that is sent.
Its result is expected to reduce brightness disproportionation, and is expected to reduce the colourity inequality.
In addition, in said structure,, can possess the control part of controlling the luminous quantity of above-mentioned illuminating part according to the testing result of last several optical detection parts in order to carry out above-mentioned control.
Backlight apparatus of the present invention preferably in said structure, possesses and carries above-mentioned optical detection part and above-mentioned illuminating part and be split into and the corresponding substrate in above-mentioned a plurality of zonules.
According to said structure, optical detection part is equipped on the identical substrate with the illuminating part of implementing control according to the testing result of this optical detection part, so, through making up the backlight apparatus that this substrate can more easily constitute the light-emitting zone with various sizes.
Backlight apparatus of the present invention preferably, in said structure, above-mentioned each substrate has the shape shapes similar with above-mentioned light-emitting zone.
The shape of the viewing area of image display panel is generally rectangular shape; And; Its aspect ratio is fixed; Therefore, form the shape shapes similar with above-mentioned viewing area, can relatively easily constitute backlight apparatus with light-emitting zone corresponding with the viewing area of various sizes through shape with each substrate.
Backlight apparatus of the present invention preferably, in said structure, the appearance and size of above-mentioned each substrate is 81mm * 144mm.
If adopt the substrate of above-mentioned size; Through the combination aforesaid substrate, just can constitute the backlight apparatus that has with the light-emitting zone of the roughly corresponding size in the viewing area of typical sizes (13,15,20,26,32,37,40,42,45,46,52,57,58,59,65 inches).
Backlight apparatus of the present invention preferably; In said structure; In above-mentioned each zonule, be and dispose a plurality of above-mentioned illuminating parts rectangularly, the position that is provided with of above-mentioned optical detection part is that identical or its difference of the quantity of illuminating part of the front and back on line direction and the column direction is 1 position.
According to said structure, in each zonule, optical detection part is positioned at the approximate centre position of a plurality of illuminating parts that are rectangular configuration, therefore, can detect the average light quantity of each zonule by means of optical detection part, thereby carry out more suitable adjustment.
Backlight apparatus of the present invention preferably in said structure, is implemented reflectivity to the face that is equipped with above-mentioned illuminating part of above-mentioned each substrate and is improved processing.So-called reflectivity improves to be handled, and means the processing of the surface of further raising substrate to the reflection of light rate, for example, realizes this processing through resin that applies white or the thin slice that attaches high reflectance.
According to said structure, can reduce the loss of the light of substrate surface side, therefore, can improve the utilization ratio of the light that illuminating part sends.
In the said structure of backlight apparatus of the present invention, above-mentioned illuminating part can be made up of three kinds of light-emitting components that send redness, green and blue light respectively.
According to said structure,, can adjust brightness and/or colourity through controlling the output of above-mentioned three kinds of light-emitting components respectively.
In addition, at least a light-emitting component in above-mentioned three kinds of light-emitting components can be such light-emitting component, that is: have light source and absorb the light that this light source sends and send the light-emitting component of the fluorophor of the light that light that this light source of wavelength ratio sends also will grow.
Backlight apparatus of the present invention preferably; In said structure; At least a light-emitting component in above-mentioned three kinds of light-emitting components is to seal with the semiconductor element of semiconductor substrate formation and by translucent resin; Wherein, above-mentioned semiconductor substrate is made up of carborundum or gallium nitride, and the refractive index of above-mentioned translucent resin is between the refractive index of refractive index and air of above-mentioned semiconductor substrate.
According to said structure, to external radiation,, can carry out by stages behind the light transmission semiconductor substrate that sends by the luminescent layer of semiconductor light-emitting elements from semiconductor substrate to the change of refractive of outside (air) through on this light path, translucent resin being set.Therefore, on above-mentioned light path, can make more light radiation, thereby improve the utilization ratio of light to outside.
Backlight apparatus of the present invention preferably in said structure, is implemented silver-plated processing to the lift-launch face of above-mentioned semiconductor element.
According to said structure, by means of silver-plated, the luminescent layer that can reflect effectively by semiconductor light-emitting elements sends and sees through the light of semiconductor substrate to the lift-launch face side radiation of this semiconductor light-emitting elements.Therefore, can be radiated outside effectively, thereby improve the utilization ratio of light to the light of the lift-launch face side radiation of semiconductor light-emitting elements.
Backlight apparatus of the present invention preferably, in said structure, above-mentioned optical detection part has the light shielding part of the direct incident of light that is used to prevent that above-mentioned illuminating part from sending.
According to said structure; Incident is (for example indirectly for the light that illuminating part sends; By the light incident after the scatterings such as diffusion sheet that are provided with in image display panel, the particularly image display panel), therefore, can under the state of the more approaching light of observing via image display panel, detect.
Backlight apparatus of the present invention preferably in said structure, is equipped with the temperature detecting part of the temperature that is used to detect aforesaid substrate on above-mentioned each substrate; About the illuminating part that above-mentioned each substrate carried, its luminous quantity is controlled according to the testing result of the temperature detecting part that on same substrate, carries.
According to said structure, can on the basis of the situation that the luminance of considering illuminating part changes according to the variations in temperature of substrate, carry out the control of luminous quantity.
The structure of display unit of the present invention does, has: above-mentioned backlight apparatus; And non-emissive type image display panel, come display image through control from the state that sees through of the light of above-mentioned backlight apparatus.
According to said structure, be expected to reduce the brightness disproportionation in the display frame.
The present invention is applicable to the downward back light modulation device such as the such non-emissive type image display panel of display panels.
The invention is not restricted to above-mentioned each embodiment, can carry out various changes within the scope of the claims, the resulting embodiment of technological means that is disclosed respectively by different embodiments through combination also is comprised in the technical scope of the present invention.
(the 2nd working of an invention mode 1)
Figure 13 is a sketch map of observing the liquid crystal indicator 101 of this embodiment from rear side.Dispose a plurality of led chips 104 (not shown in Figure 13, with reference to then state) a plurality of 112 face side as light-emitting component.Make the light uniformization that led chip 104 is sent by means of diffusion sheet 122, and illumination is configured in the liquid crystal panel 123 in the outside of diffusion sheet 122, shows thereby can carry out image.Can come freely to determine the number of configured of piece 112 on laterally reaching vertically according to the picture dimension of LCD TV.In this embodiment, the longitudinal length of piece 112 is 9: 8 with the ratio of lateral length, disposes 4 in the vertical, disposes 8 in the horizontal, and like this, the aspect ratio that just can be suitable for HDTV is 9: 16 a picture.In addition; WO00/037904 (open day: on June 29th, 2000) disclosed a kind of backlight apparatus that utilizes guided wave plate (Wave Guide Board); In this backlight apparatus; The zone of backlight is not cut apart in fact, be difficult to the pairing viewing area of sensor is formed more than 4 or 4.Different therewith is, in this embodiment, can form piece number arbitrarily, therefore, is suitable for constituting large-scale backlight apparatus.In addition; Can also constitute such display unit; That is, liquid crystal panel 123 is replaced into such as MEMS (microelectromechanical systems) panel, has utilized the display unit of the non-emissive type image display panel except that liquid crystal panel of the optical gate panel (Shutter Pannel) etc. of electrooptics effect or electrophoretic effects.
In order to connect a plurality of 112, configuration connector 113 on the two opposite edges in four limits of piece 112 connects through cable 116 between the connector 113.Like this, each piece 112 is connected with control substrate 124.
On control substrate 124, be equipped with microcomputer 111.Microcomputer 111 has the function of control circuit, transmits the signal of the benchmark that becomes the LED driving to the integrated circuit component 110 of each piece 112.
Figure 14 (a) representes the front of each piece 112.The material of the basal substrate of piece 112 (Base Substrate) 112A is an expoxy glass, can carry out multilayer wired.Central configuration in the front of piece 112 has optical sensor 102, and this optical sensor 102 detects red, green, blue photodiodes by three and constitutes.In the LED configuring area 103 around the optical sensor 102, mount (Die Bond) a plurality of red LED chips, green LED chip, blue led chip (being generically and collectively referred to as " led chip 104 ") are arranged.As stated, at the central configuration optical sensor 102 of piece 112, owing to less receive influence, therefore, can between the inner optical sensor 102 of piece and led chip 104, implement the FEEDBACK CONTROL of closure from the light of adjacent block.
Shown in Figure 14 (b), be equipped with integrated circuit component 110 at the back side of piece 112.Integrated circuit component 110 is connected with outside through connector 113, cable 116.Part outside the part that has disposed integrated circuit component 110 is provided with fin 114.
Figure 15 is the profile of piece 112; As shown in the drawing; In the front of basal substrate 112A, implement lead-in wire bonding (Wire Bond) through spun gold 105 between the distribution sheet (not shown) in electrode slice of a plurality of led chips 104 (not shown) and the piece 112, thereby realize being electrically connected.Led chip and spun gold 105 are by protecting such as the transparent sealing resin 115 of silicon or epoxy resin etc.The back side at the basal substrate 112A that led chip 104 has been installed is equipped with fin 114.Fin 114 contacts with the casing (Chassis) 120 of a part that constitutes display unit (unit), and thus, casing 120 can carry out good heat radiation.At the back side of basal substrate 112A, on the position of contact heat spreader 114 not, integrated circuit component 110 is installed.In addition, on the relative limit at the back side of basal substrate 112A, dispose connector 113.
Figure 16 is illustrated near the profile of the part that has mounted led chip 104 on the basal substrate 112A.The zone that (has mounted) led chip 104 in configuration is arranged with through hole (ThroughHole) 117, and the distribution 118 that is pasted with the part of led chip 104 is connected with the distribution 118 at the back side of basal substrate 112A via through hole 117.This distribution 118 is made up of the heat conductivility preferred metal of copper etc., and contacts with fin 114, and therefore, the radiating efficiency of led chip 104 is improved.
In this embodiment, basal substrate 112A has adopted expoxy glass, therefore, can implement multilayer wiredly, limited by the distributions in the piece 112, therefore, can guarantee the free degree of the distribution of led chip.Because can implement complicated distribution, so, can with comparalive ease integrated circuit component be equipped on the piece 112.
In addition; Can or all replace the part of blueness used in this embodiment, green, red LED; For example; Red LED is replaced into blue led and absorbs light that blue led sends and the combination of sending the fluorophor of red fluorescence, green LED is replaced into blue led and absorbs light that blue led sends and the combination of sending the fluorophor of green fluorescence.In addition, can also use the combination of sending ultraviolet LED and sending the fluorophor of blueness, green, redness.
In addition, in this embodiment, explained that the LED of red, green, blue three looks is used as light-emitting component and colourity and even brightness example, still,, for example, can also use White LED as light-emitting component.In this case, no longer carry out the control of colourity, and only control is implemented in brightness.As White LED, the common red LED and the combination of yellow fluorophor can be adopted, but the combination of above-mentioned blue led and green and red-emitting phosphors can be preferably adopted, perhaps, the combination of ultraviolet LED and blueness, green, red-emitting phosphors etc.
(circuit structure in the 2nd working of an invention the mode 1 and action of backlight apparatus)
Figure 17 (a) is the sketch map of circuit structure.In piece 112, be equipped with optical sensor 102, led chip 104, integrated circuit component 110 (by A/D converter 110A, can rewrite ROM110B, led drive circuit 110C constitutes).Optical sensor 102 is optical sensors that the photodiode of photodiode, the band blue color filter of one group of photodiode by colour filter redly, band green color filter constitutes; Detect the luminous quantity of all kinds of redness in each piece 112, green, blue led chip 104, and be data signal with the pairing analog signal conversion of above-mentioned light quantity by A/D converter 110A.
Can rewrite ROM110B be stored in led chip 104 with predetermined colourity and brightness the output valve of resulting optical sensor 102 when luminous (below, be referred to as " optical sensor a reference value ") (, will set forth in the back) about storage means.
Backlight apparatus carries out following action.When the led chip in each piece 112 that constitutes backlight apparatus 104 is driven; Optical sensor 102 detects colourity and the brightness in each piece, and the output valve of this optical sensor 102 and the optical sensor a reference value that can rewrite among the ROM110B to be stored are sent in the microcomputer 111 of outside of piece 112.
Led drive circuit 110C controls according to above-mentioned control signal will be to PWM (the Pulse Width Modulation: the pulse width of drive current pulse width modulation) of led chip 104 outputs.In addition, about the PWM output of this embodiment, current value is constant, still, also can make brightness or colourity change through the change current value.In addition, also can be simulation output (can obtain the current value of desired luminous quantity), rather than PWM drives output.
The microcomputer 111 that in control substrate 124, carries transmits control signal to a plurality of 112 timesharing.This be because, the main purpose of the colourity of backlight and brightness adjustment be to variations in temperature or through the time change and implement to proofread and correct, do not need to transmit control signal continuously.
Through above-mentioned action, carry out FEEDBACK CONTROL so that the output valve of optical sensor 102 becomes setting value.Carry out above-mentioned feedback action so that the standardization optical sensor output valve of each piece becomes stable, therefore, the colourity of the light-emitting component of each piece can be because of the different differences separately of piece with brightness itself sometimes.For example, in the piece of the middle body that is configured in backlight apparatus,, therefore, the brightness of light-emitting component is controlled so that standardization optical sensor output valve becomes stable because the light of adjacent piece gets into optical sensor morely.Through above-mentioned action, make the backlight apparatus brightness that becomes on the whole even.
In addition, about above-mentioned action, make backlight apparatus stably send the white light of constant set value, but when setting value changes, also can carry out feedback action.The setting value that is used to obtain the standardization optical sensor output of white light is generally red: green: blue=1: 1: 1, to this, when display image is dark, can move that to make that the set overall value is reduced to for example red: green: blue=0.2: 0.2: 0.2.Perhaps, can carry out action that both of brightness and colourity are implemented to adjust.For example, when 112 images displayed of piece in liquid crystal indicator are blue image (for example, the sea), can move, make standardization optical sensor output of all kinds become: green: blue=0.1: 0.2: 1.0 such as red.
In addition, shown in Figure 14 (b), in piece 112, be equipped with a plurality of integrated circuit components 110.The said integrated circuit element need not to be identical integrated circuit component; For example; One of them integrated circuit component 110 can be by above-mentioned A/D converter 110A, can rewrite ROM110B, led drive circuit 110C constitutes, and remaining integrated circuit component 110 can be made up of led drive circuit 110C.
Figure 17 (b) is the sketch map that is illustrated in the signal stream in another structure.In piece 112, be equipped with optical sensor 102, led chip 104, integrated circuit component 110Z (by A/D converter 110A, can rewrite ROM110B, LED control circuit 110D, led drive circuit 110C constitute).
Store the optical sensor a reference value among the ROM110B can rewriteeing, wherein, the optical sensor a reference value is the output valve of resulting optical sensor 102 when led chip 104 is luminous with predetermined colourity and brightness.The output valve of above-mentioned optical sensor a reference value and optical sensor 102 is sent among the LED control circuit 110D of piece 112 inside, and led drive circuit 110C comes driving LED chip 104 according to the control signal that LED control circuit 110D sends.
In addition, because optical sensor 102 also receives the light of adjacent block, therefore, can only in piece, carry out FEEDBACK CONTROL and just exist query.For example, when the actual reduction of the brightness of adjacent block, strengthen its brightness through FEEDBACK CONTROL, thus, the brightness that causes the light-emitting component in this piece is greater than predetermined value, and the result just causes brightness disproportionation significantly to change.Also there is same problem about colourity.And in the structure of so the light of interblock not being implemented to cover such as this embodiment, in the light that optical sensor 102 receives, the light of adjacent block sometimes will be more than the light from this piece.But; All pieces to display unit carry out under the situation of FEEDBACK CONTROL respectively; For brightness and the colourity that stably keeps adjacent block, in piece, implement closed FEEDBACK CONTROL even resemble above-mentioned, also can mainly proofread and correct colourity in each piece and brightness variation; Therefore, can be through implementing FEEDBACK CONTROL so that backlight apparatus can not produce colourity inequality and brightness disproportionation on the whole.
In addition, below, the corresponding relation on the function that exists between described structure of this embodiment and the described structure of the 1st invention is described.Liquid crystal indicator 101 is corresponding with liquid crystal indicator 1; Liquid crystal panel 123 is corresponding with liquid crystal cells 2, and the integrated circuit component 110 of each piece 112 is corresponding with backlight lamp control portion 5, and it is corresponding with benchmark light quantity data storage 51e to rewrite ROM110B; Microcomputer 111 is corresponding with the control function of driving and power circuit 6; Piece 112 is corresponding with backlight substrate 31, and optical sensor 102 is corresponding with color sensor 31a, and led chip 104 is corresponding with LED31b.
The method of adjustment of the optical sensor a reference value of each piece (in the 2nd working of an invention mode 1 to)
Be described below, setting will obtain the required optical sensor a reference value of standardization optical sensor output, and is stored to and can rewrites among the ROM110B.
In piece adjusting device 140 shown in Figure 180, insert piece 112.Piece adjusting device 140 has external light sensor 142, and external light sensor 142 is accepted the light that a plurality of led chips 104 of each piece 112 are sent.In addition, piece adjusting device 140 has diffusion sheet 145, and diffusion sheet 145 is used to spread the light that the led chip 104 of piece 112 is sent.The material of the diffusion sheet 122 that the material of diffusion sheet 145 and liquid crystal indicator 101 are used is identical, and piece 112 is configured to distance between the diffusion sheet 145 and piece 112 equates with distance between the diffusion sheet 122.As external light sensor 142, adopted the sensor identical, but also can adopt other sensor with optical sensor 102.
In addition, about the distance between external light sensor 142 and the piece 112, preferably, greater than cornerwise length of piece 112, more preferably, greater than the twice of cornerwise length of piece 112.
As above-mentioned predetermined chromaticity and brightness, can be, colour temperature higher in brightness for predetermined colour temperature (for example, 9000K) a bit go up resulting value; It also can be resulting value on a plurality of points; For example, (for example the lower situation of brightness condition with higher, brightness (for example, for the brightness of brightness when higher 1/5), colour temperature condition with higher have been made up; The situation that 12000K), colour temperature is lower (for example, 5000K) four points.In addition; Can carry out following driving, and need not red, green, blue led chip are driven simultaneously, that is: at first; For red LED; External control circuit 144 is read predetermined luminance (low-light level, brightness, high brightness) from external memory storage 143, and (about the step 1) of R, external control circuit 144 reads in the output of the optical sensor 102 of this moment so that the detected value of external light sensor 142 becomes predetermined brightness thereby control signal is sent to that led drive circuit 110C drives red LED; The row operation of going forward side by side; Obtain the value (optical sensor a reference value) (about the step 2 of R) that multiply by after the above-mentioned coefficient correlation, the rewritten ROM110B that the optical sensor a reference value is stored in the integrated circuit component 110 (about the step 3) of R, can carry out identical operations to green, blue led.Can store less optical sensor a reference value such as above-mentioned that kind, and through calculating the optical sensor a reference value of trying to achieve other conditions.In addition, also can store more optical sensor a reference value (for example, 256 points).
Shared piece adjusting device 140 with external light sensor 142 (perhaps when each piece 112 is adjusted; Be constituted as and carry out piece adjusting device adjustment, in fact identical identical) with this adjusting device; The optical sensor a reference value of each piece 112 is stored among the rewritten ROM110B of each piece 112; Thus, only, need not to adjust the backlight apparatus that just can obtain having good uniformity through combination block 112.In addition, for example, when fault has taken place a piece 112 in backlight apparatus, only need replace this piece 112, after replacement, need not to adjust and just can send and the uniform light of adjacent piece, therefore, it is easy to implement that reconditioning work becomes.
(the 2nd working of an invention mode 2)
The another one problem is to be difficult to obtain the inner colourity of piece or the uniformity of brightness through adjustment.For example; Communique (open day: the technical scheme that on May 18th, 2006) is disclosed is disclosed No. 2006103612 according to U.S. Patent application; Under the situation to each LED storing driver voltage and dutycycle, even obtained the uniformity of brightness in the early stage, still for the luminance deviation of proofreading and correct each LED; If conditions such as the temperature of LED change, the luminous intensity of each LED also will change.Under the situation of the LED that has adopted multiple color, can not obtain the uniformity of colourity.
In this embodiment, not only set the colourity and the brightness of each piece, and then be employed in the device that also can obtain optical uniformity in the face of each piece substrate; And; Implement FEEDBACK CONTROL by means of optical sensor, like this, even under the situation of occurrence temperature variation etc., also can guarantee optical uniformity.
In addition, the miniaturization through realizing each piece is also disposed in a large number, also can obtain the effect of optical uniformity; But,, thereby cause cost to raise because the number of components of optical sensor etc. increases; Therefore, from the cost consideration of parts, the industrial utilizability of this embodiment is higher.
The structural representation of Figure 19 (a) and Figure 19 (b) expression piece 150, Figure 19 (a) and Figure 19 (b) are respectively front elevation and back view.Front at piece 150 is equipped with: the LED group 151R of be connected in series red LED (R among the figure), 152R, 153R, 154R; LED group 151G, 152G, 153G, the 154G of green LED (G among the figure) have been connected in series; LED group 151B, 152B, 153B, the 154B of blue led (B among the figure) have been connected in series; Optical sensor 155.As stated, through in series disposing the LED in the LED group, proportionality coefficient as corrected value of LED settings is got final product.In addition, also can for: be not connected in series, and respectively each LED set corrected value, and independently drive.
The LED group 151R～154B that is installed in the front of piece 150 is connected with the integrated circuit component 157 at the back side that is installed in piece 150 via through hole 158, and optical sensor 155 is connected with the integrated circuit component 156 at the back side that is installed in piece 150 via through hole 159.
The backlight apparatus of this embodiment carries out following action.In each piece 150 that constitutes backlight apparatus, light LED group 151R～154B.In the piece and the light of the LED of adjacent block detect by diffusion sheet 122 (same as shown in Figure 13) reflection and by optical sensor 155.The optical signal of optical sensor 155 is sent to the A/D converter 156A in the integrated circuit component 156; And the optical sensor a reference value that rewritten ROM156B stored in integrated circuit component 156, be sent in the microcomputer 111 outside the piece 150 (same as shown in Figure 13) via connector 13.
Control signal slave microcomputer 111 is sent to the correcting circuit 157B in the integrated circuit component 157, and wherein, control signal is the signal that generates for the standardization optical sensor output that makes optical sensor 155 is stable.Correcting circuit 157B implements to proofread and correct to control signal, and sends it among the led drive circuit 157C with reference to the data of the rewritten ROM157A that has stored corrected value.The control signal of led drive circuit 157C after according to above-mentioned being corrected for example implemented to drive to LED group 151R.About other LED groups, also carry out same action.In addition; Here; LED is organized 151R, 151G, 151B be set at one group and it is driven, still, also can LED be organized 151R, 152R, 153R, 154R and be set at one group and it is provided with drive circuit by led drive circuit 157C; 157C drives it, also can be driven all the LED groups in the piece 150 by a led drive circuit.In addition, the connected mode about the LED in the LED group can not adopt to be connected in series, and employing is connected in parallel or made up series connection and parallelly connected connected mode.In addition, LED need not to constitute LED group, drive circuit is connected with each LED and it is independently driven.
As stated, for each LED group, correcting controlling signal also drives, and implements FEEDBACK CONTROL so that the output of standardization optical sensor becomes predetermined value, thus, can drive the backlight apparatus that in the face of piece, also can obtain optical uniformity.
Can only not adopt the photodiode of colour filter to constitute optical sensor 155 by one.Luminous for luminous, the blue led of luminous, the green LED that detects red LED respectively; Be set in the time of extinguishing the LED of other color such as only lighting red LED in the course of action of backlight apparatus, and in the time of this setting, the luminous of red LED detected by optical sensor 155.LED to other color also carries out similar detection, thus, obtains colourity and monochrome information.This detection method has such advantage, can not receive the influence of colour filter deterioration etc. that is:.
The method of adjustment of the optical sensor a reference value of each piece and LED group correction coefficient (in the 2nd working of an invention mode 2 to)
In this embodiment; As the 2nd working of an invention mode 1 is said set whole optical sensor a reference value; And; To distribute in order reducing in the face in the piece 150, also to be set in each LED group 151R～154B and to send the pairing information of drive condition in the condition of light of predetermined luminance or colourity (below, be referred to as " LED organizes correction coefficient ").Below, this setting is described.
In piece adjusting device 170 shown in Figure 20, insert piece 150.Piece adjusting device 170 has: diffusion sheet 171, and the light that the LED of piece 150 group 151R～154B is sent spreads; And area sensor 172, distribute in the face with the colourity of diffusion sheet 171 and brightness and detect as image.The material of the diffusion sheet 122 that uses in the material of diffusion sheet 171 and the liquid crystal indicator 101 is identical.The distance of piece 150 to diffusion sheet 171 is set to equate with the distance of piece 150 to diffusion sheet 122.
Then, in memory, store the optical sensor a reference value with being described below.
To the output (step 2A) of external control circuit 174 inputs optical sensor 155 at this moment, computing optical sensor a reference value (step 2B).Owing to exist diffusion sheet 171, so the output of optical sensor 155 is roughly corresponding to by the output under the state behind actual installation to the liquid crystal indicator 101.If there is error, just this error is carried out computing, union is as the optical sensor a reference value of the output of optical sensor 155, and wherein, this optical sensor a reference value is the condition that the detected value after the above-mentioned equalization becomes predetermined chromaticity and brightness.
Then, store above-mentioned optical sensor a reference value in the integrated circuit component 156 rewritten ROM156B (with reference to Figure 19 (b)) (step 3).In addition, can be as described above to execution above-mentioned steps 1 to 3 of all kinds.
As stated, at first set LED group correction coefficient, set the optical sensor a reference value then, thus, the adjustment operation has realized simplification.In addition, also can at first set the optical sensor a reference value, set LED group correction coefficient then, still, in this case, error appears in optical sensor a reference value sometimes.At this moment, can set the optical sensor a reference value once more.
In addition, about the distance between area sensor 172 and the diffusion sheet 171, preferably, greater than cornerwise length of piece 150, more preferably, greater than the twice of cornerwise length of piece 150.
As stated; The optical sensor a reference value of each piece 150 and LED group correction coefficient are stored in advance among the rewritten ROM156A, 156B of each piece 150; Drive backlight apparatus according to above-mentioned optical sensor a reference value and LED group correction coefficient; Thus, can realize that colourity and brightness are at interblock and the inner backlight apparatus uniformly of piece.
In addition, in this embodiment, to each LED settings LED group correction coefficient, still luminous more uniformly in order to obtain, preferably, each LED is implemented to drive, each LED is set correction coefficient.This LED number that is equivalent in the LED group is 1 a situation.
(the 2nd working of an invention mode 3)
In this embodiment, dispose integrated circuit component 187 in the front of piece 180.In addition, the configuration of LED group is different with quantity.
Figure 21 is the profile of the piece 180 of this embodiment.The collocating integrate circuit element 187 in the front of basal substrate 180A, are provided with high reflecting member 121 so that cover integrated circuit component 187.Acting as of high reflecting member 121 is following, that is: the light that is laterally being sent by the led chip 104 that constitutes each LED group to the top reflection; Secondary reflection is turned back to the light of substrate by diffusion sheet 122 (not shown) again.In addition, the connector 113 of 180 of contiguous blocks is also covered by high reflecting member 121 with cable 116.
Owing to adopted casing 120 directly and the back side contacting structure of piece 180, therefore, can obtain better heat radiating effect.
Figure 22 is a part of amplification profile of Figure 21.The zone that (has mounted) led chip 104 in configuration is arranged with through hole 117, is connected with multilayer wired 118 of the back side of basal substrate 180A.In addition, (mounted) in configuration integrated circuit component 187 the zone under also be provided with through hole 117, be connected with multilayer wired 118 of the back side of piece 180.Adopt above-mentioned multilayer wired 118 with casing 120 contacting structure.Thus, can the heat that led chip 104, integrated circuit component 187 produces be directed at through hole 117 and multilayer wired 118, and dispel the heat to the outside from casing 120.
Figure 23 representes the structural representation of piece 180, and Figure 23 is the front elevation of piece 180.Front at piece 180 is equipped with: the LED group 181R of the red LED that has been connected in series, 182R, 183R, 184R; The LED group 181G of the green LED that has been connected in series, 182G, 183G, 184G; LED group 181B, 182B, 183B, the 184B of blue led have been connected in series; Optical sensor 185.Be configured in as LED group 181R, 181G, the 181B of the combination of red, green, blue led group in 1/4 the zone of piece 180, observe from optical sensor 185, in the horizontal and vertical line symmetry that all is.
Adopted above-mentioned backlight apparatus to carry out following action.When driving each LED group, optical sensor 185 produces optical signal.Above-mentioned optical signal is sent to the A/D converter 186A in the integrated circuit component 186; And the optical sensor a reference value that rewritten ROM16B stored in integrated circuit component 186, be sent in the microcomputer 111 outside the piece 180 (not shown) via connector 113.Microcomputer 111 generates and predetermined colourity and the corresponding control signal of brightness.This control signal is sent to the correcting circuit 187B in the integrated circuit component 187, and wherein, integrated circuit component 187 is installed in the front of piece 180.Correcting circuit 187B control signal is implemented to proofread and correct, and the control signal after will proofreading and correct sends among the led drive circuit 187C with reference to the data of the rewritten ROM187A that has stored LED group correction coefficient.The control signal of led drive circuit 187C after according to above-mentioned being corrected for example implemented to drive to LED group 181R.About other LED groups 181G, 181B, also carry out same action.Thus, can implement FEEDBACK CONTROL so that brightness and the chroma stability in the piece, and proofread and correct the deviation in its face.In adjacent piece, also implement same control, thus, move as colourity and even brightness backlight apparatus.
The method of adjustment of the optical sensor a reference value of each piece and LED group correction coefficient (in the 2nd working of an invention mode 3 to)
In this embodiment; As the 2nd working of an invention mode 1 is said set whole optical sensor a reference value; And; Distribute in order to reduce in the face in the piece 180, the 2nd working of an invention mode 1 that do not resemble is said adopt area sensor, but each LED group 181R～184B is set LED group correction coefficient.Below, this setting is described.
In piece adjusting device 190 shown in Figure 24, insert piece 180 and diffusion sheet 191, close loam cake 190A, thereby piece 180 and diffusion sheet 191 are placed the dark place.Diffusion sheet 191 is supported by rail 191A.On piece adjusting device 190, be provided with external light sensor device 192.
In above-mentioned operation; External control circuit 194 reads in the setting value of external sensor 193 and the output valve of external light sensor 192 (about the step 1A of R); Lighting of 194 pairs of red LED groups of external control circuit 181R～184R controlled; So that the setting value consistent (about the step 1B of R) of the output valve of external light sensor 192 and external sensor 193; After external control circuit 194 is obtained the output valve of optical sensor 185, the optical sensor a reference value is carried out computing (about the step 2 of R), the optical sensor a reference value is write rewritten ROM186B (with reference to Figure 23) in the integrated circuit component 186 (about the step 3) of R.To LED of all kinds aforesaid operations repeatedly.Under above-mentioned situation,, obtain the output of the optical sensor 185 in the piece adjusting device 190 in advance and by the dependency relation between the output of actual optical sensor 185 when carrying to liquid-crystal apparatus for the optical sensor a reference value is carried out computing.
Through inserting diffusion sheet 191 and implementing above-mentioned adjustment; Can obtain and carry the close value of output valve of the optical sensor 185 to the liquid crystal indicator; Can omit above-mentioned computing (it is also conceivable that coefficient is 1 computing) under certain conditions; But, even under the state of having removed diffusion sheet 191, also can implement above-mentioned adjustment.
(other embodiments of the 2nd invention)
In the above-described embodiment, monolithic (Single Tile) is made up of a slice basal substrate and other structure member.But, piece is done as a whole consideration gets final product.Therefore, for example, can monolithic be constituted followingly, that is: another plate base is installed at the back side of substrate, and on substrate collocating integrate circuit etc.
In addition, for example, suppose that monolithic has following structures, that is: horizontal and vertical respectively dispose 2, made up described of 4 above-mentioned embodiments altogether.In the monolithic of this structure, though four groups of optical sensors that are not configured in central authorities are arranged,, in fact comparatively speaking do not have any variation with above-mentioned embodiment.
In addition, in the above-described embodiment, do not adopt temperature sensor.But, the wavelength Yin Wendu of led chip, particularly red LED chips and changing, iff remains unchanged light intensity, so, has considered that the brightness of visibility (Visibility) is unstable sometimes.
In the above-described embodiment, adopted as memory to rewrite ROM, still, can adopt also that write-once is gone into ROM (One-time Writable ROM), flash memories, the RAM that supports by battery etc.
In addition, in the above-described embodiment, the situation of in all pieces, using optical sensor has been described, still, also can only in a part of piece, have been carried optical sensor.
The invention is not restricted to above-mentioned each embodiment, can carry out various changes within the scope of the claims, the resulting embodiment of technological means that is disclosed respectively by different embodiments through combination also is comprised in the technical scope of the present invention.
The above-mentioned specific embodiment of the present invention just is used to set forth the example of technology contents of the present invention.The present invention is not limited to the above-mentioned specific embodiment, should not carry out the explanation of narrow sense to it.In the scope of spirit of the present invention and claim, can carry out various changes and implement it.
Claims (28)
1. a backlight apparatus is characterized in that,
This backlight apparatus has: a plurality of substrates;
The light-emitting component that above-mentioned each substrate possessed, optical sensor and memory; With
Be arranged on above-mentioned each substrate and be used to drive the drive circuit of the light-emitting component that above-mentioned each substrate possesses,
Wherein, above-mentioned each optical sensor is disposed on the substantial middle position of the lift-launch face that is equipped with above-mentioned each light-emitting component in above-mentioned each substrate;
In the above-mentioned memory of above-mentioned each substrate, store the pairing information of output valve of sending the above-mentioned optical sensor under the condition of light of predetermined luminance or colourity at above-mentioned light-emitting component.
2. backlight apparatus according to claim 1 is characterized in that having:
Control circuit; Make the outputting standardization of above-mentioned optical sensor according to canned data in the memory of above-mentioned correspondence; And above-mentioned drive circuit generated control signal, make that the setting value of brightness or colourity of output and above-mentioned backlight apparatus of above-mentioned standardized optical sensor is consistent.
3. backlight apparatus according to claim 2 is characterized in that:
Above-mentioned control circuit is set at outside the aforesaid substrate.
4. backlight apparatus according to claim 3 is characterized in that:
Above-mentioned control circuit generates the timesharing control signal to above-mentioned each substrate.
5. backlight apparatus according to claim 2 is characterized in that:
Above-mentioned control circuit is made up of a plurality of control circuits, and above-mentioned each control circuit is set in above-mentioned each substrate.
6. backlight apparatus according to claim 1 is characterized in that:
Above-mentioned light-emitting component comprises blue light emitting device, green luminousing element and red light-emitting component.
7. backlight apparatus according to claim 6 is characterized in that:
The light-emitting component of at least a color in the above-mentioned light-emitting component of all kinds comprises LED.
8. backlight apparatus according to claim 1 is characterized in that:
Above-mentioned light-emitting component be configured in above-mentioned each substrate configuration the substantial middle position of face of above-mentioned light-emitting component.
9. backlight apparatus according to claim 1 is characterized in that:
Above-mentioned optical sensor comprises: detect the optical sensor of blue light, the optical sensor of green light and the optical sensor of detection red light.
10. backlight apparatus according to claim 1 is characterized in that:
Above-mentioned optical sensor drives the light of all kinds that above-mentioned light-emitting component detects above-mentioned light-emitting component through timesharing.
11. backlight apparatus according to claim 1 is characterized in that:
In above-mentioned memory, store above-mentioned light-emitting component in aforesaid substrate and send the pairing information of output valve of the above-mentioned optical sensor under the condition of light of predetermined colour temperature.
12. backlight apparatus according to claim 6 is characterized in that:
In above-mentioned memory, store light-emitting component of all kinds in aforesaid substrate and send the pairing information of output valve of the above-mentioned optical sensor under the condition of light of predetermined luminance respectively.
13. backlight apparatus according to claim 1 is characterized in that:
In above-mentioned memory, store the brightness or the pairing information of chromaticity distortion of the above-mentioned light-emitting component in the aforesaid substrate.
14. backlight apparatus according to claim 13 is characterized in that:
Above-mentioned light-emitting component is made up of light emitting device group.
15. backlight apparatus according to claim 14 is characterized in that:
Has the above-mentioned light-emitting component that above-mentioned light emitting device group constituted that is connected in series.
16. backlight apparatus according to claim 3 is characterized in that:
In above-mentioned memory, store the pairing information of drive condition of sending the above-mentioned light-emitting component under the condition of light of predetermined luminance or colourity in each of above-mentioned light-emitting component.
17. backlight apparatus according to claim 3 is characterized in that:
Above-mentioned memory comprises: the 1st memory stores the pairing information of output valve that above-mentioned light-emitting component in aforesaid substrate sends the above-mentioned optical sensor under the condition of light of predetermined luminance or colourity; And the 2nd memory, store the brightness or the chromaticity distortion of the light-emitting component in the aforesaid substrate.
18. backlight apparatus according to claim 1 is characterized in that:
Be provided with above-mentioned light-emitting component and above-mentioned optical sensor in the front of aforesaid substrate, be provided with above-mentioned memory at the back side of aforesaid substrate.
19. backlight apparatus according to claim 1 is characterized in that:
Above-mentioned memory be merged in the incorporate integrated circuit component of above-mentioned drive circuit in.
20. backlight apparatus according to claim 1 is characterized in that:
But above-mentioned memory is write memory or recordable memory.
21. a display unit is characterized in that having:
The described backlight apparatus of claim 1; And
Non-emissive type image display panel comes display image through control from the state that sees through of the light of above-mentioned backlight apparatus.
22. the driving method of a backlight apparatus, this backlight apparatus has: a plurality of substrates; The light-emitting component that above-mentioned each substrate possessed, optical sensor and memory; Drive circuit and control circuit; Above-mentioned each optical sensor is disposed on the substantial middle position of the lift-launch face that is equipped with above-mentioned each light-emitting component in above-mentioned each substrate; In above-mentioned memory, store light-emitting component that aforesaid substrate possesses and send the pairing information of output valve of the above-mentioned optical sensor under the condition of light of predetermined luminance or colourity; This driving method is characterised in that, comprising:
The step of the above-mentioned light-emitting component of above-mentioned driving circuit drives; And
Above-mentioned control circuit makes the outputting standardization of above-mentioned optical sensor according to canned data in above-mentioned memory; Above-mentioned drive circuit is generated and sent control signal, make the output and brightness that is set or the consistent step of colourity of above-mentioned standardized optical sensor.
23. the method for adjustment of a backlight apparatus is used for the described backlight apparatus of claim 1 is adjusted, this method of adjustment is characterised in that, comprising:
The 1st step drives above-mentioned light-emitting component, is detected by the luminous quantity of the shared in fact external light sensor of above-mentioned each substrate to above-mentioned light-emitting component;
The 2nd step is come a reference value of the optical sensor output of computing expection according to the output of the optical sensor that aforesaid substrate possessed; And
The 3rd step, a reference value that above-mentioned optical sensor is exported stores in the above-mentioned memory,
Above-mentioned each substrate is carried out above-mentioned the 1st step, the 2nd step and the 3rd step.
24. the method for adjustment of backlight apparatus according to claim 23 is characterized in that, also comprises:
The 4th step drives above-mentioned light-emitting component, by the brightness or the pairing information of chromaticity distortion of the light-emitting component of said external light sensors aforesaid substrate; And
The 5th step stores the brightness or the pairing information of chromaticity distortion of the light-emitting component of aforesaid substrate in the above-mentioned memory into.
25. the method for adjustment of backlight apparatus according to claim 23 is characterized in that:
Above-mentioned light-emitting component is a light emitting device group.
26. the method for adjustment of backlight apparatus according to claim 24 is characterized in that:
The said external optical sensor is the external light sensor that brightness or colourity are detected as image.
27. the method for adjustment of a backlight apparatus is used for the described backlight apparatus of claim 1 is adjusted, this method of adjustment is characterised in that, comprising:
The 1st step drives above-mentioned light-emitting component, by the brightness or the pairing information of chromaticity distortion of the light-emitting component of said external light sensors aforesaid substrate;
The 2nd step stores the brightness or the pairing information of chromaticity distortion of the light-emitting component of aforesaid substrate in the above-mentioned memory into;
The 3rd step drives above-mentioned light-emitting component, is detected by the luminous quantity of the shared in fact external light sensor of above-mentioned each substrate to above-mentioned light-emitting component;
The 4th step is come a reference value of the optical sensor output of computing expection according to the output of the optical sensor that aforesaid substrate possessed; And
The 5th step, a reference value that above-mentioned optical sensor is exported stores in the above-mentioned memory.
28. the method for adjustment of a backlight apparatus is used for the described backlight apparatus of claim 1 is adjusted, this method of adjustment is characterised in that:
Above-mentioned light-emitting component comprises the light-emitting component of a plurality of different colors;
Light-emitting component above-mentioned of all kinds to above-mentioned each substrate is carried out the series of steps that comprises the 1st step, the 2nd step, the 3rd step, wherein,
The 1st step drives the light-emitting component of a kind of illuminant colour in the light-emitting component of above-mentioned different colors, is detected by the luminous quantity of shared in fact external light sensor to the light-emitting component of above-mentioned a kind of illuminant colour;
The 2nd step is come a reference value of the optical sensor output of computing expection according to the output of the optical sensor that aforesaid substrate possessed; And
The 3rd step, a reference value that above-mentioned optical sensor is exported stores in the above-mentioned memory.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005295774 | 2005-10-07 | ||
| JP2005295774A JP4884744B2 (en) | 2005-10-07 | 2005-10-07 | Backlight device and display device including the same |
| JP2005-295774 | 2005-10-07 | ||
| JP2006095865 | 2006-03-30 | ||
| JP2006-095865 | 2006-03-30 | ||
| JP2006095865 | 2006-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101414669A Division CN100498466C (en) | 2005-10-07 | 2006-09-29 | Back light lamp and display device having this device, method for driving and adjusting the device |
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| Publication Number | Publication Date |
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| CN101556006A CN101556006A (en) | 2009-10-14 |
| CN101556006B true CN101556006B (en) | 2012-07-25 |
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| CNB2006101414669A Expired - Fee Related CN100498466C (en) | 2005-10-07 | 2006-09-29 | Back light lamp and display device having this device, method for driving and adjusting the device |
| CN 200910134743 Expired - Fee Related CN101556006B (en) | 2005-10-07 | 2006-09-29 | Backlight device and display device equipped with the same |
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| CNB2006101414669A Expired - Fee Related CN100498466C (en) | 2005-10-07 | 2006-09-29 | Back light lamp and display device having this device, method for driving and adjusting the device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100498466C (en) | 2009-06-10 |
| CN1945405A (en) | 2007-04-11 |
| CN101556006A (en) | 2009-10-14 |
| JP2007102136A (en) | 2007-04-19 |
| JP4884744B2 (en) | 2012-02-29 |
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