CN100510899C - Display apparatus and driving method therefor - Google Patents
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- CN100510899C CN100510899C CNB2007101058828A CN200710105882A CN100510899C CN 100510899 C CN100510899 C CN 100510899C CN B2007101058828 A CNB2007101058828 A CN B2007101058828A CN 200710105882 A CN200710105882 A CN 200710105882A CN 100510899 C CN100510899 C CN 100510899C
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
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- G—PHYSICS
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- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0237—Switching ON and OFF the backlight within one frame
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
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- G09G2320/06—Adjustment of display parameters
- G09G2320/066—Adjustment of display parameters for control of contrast
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The invention provides a display apparatus and a driving method. The display apparatus includes a display section formed from a liquid crystal display apparatus of the transmission type, a backlight formed from a light source unit, and a drive section having a control section to control a light emitting state of the light source unit based on the maximum input signal having the maximum value within the input signal corresponding to the display region unit constituting the display apparatus. The control section performs processing to increase the luminance of the light source unit corresponding to the low luminance display region unit when the high luminance display region unit of a second prescribed value or above in the value of the maximum input signal exists on the surrounding of the low luminance display region unit equal to or lower than the first regulated value in the value of the maximum input signal.
Description
Technical field
The present invention relates to a kind of the possess display part that constitutes by liquid crystal indicator and the display device and the driving method thereof of backlight.
Background technology
In liquid crystal indicator, himself is not luminous for liquid crystal material.Therefore, for example the configuration of the back side of liquid crystal indicator to mo(u)ld bottom half (
Mo(u)ld bottom half) backlight.In addition, in color liquid crystal display arrangement, 1 pixel for example is made of these three sub-pixs of emitting red light sub-pix (sub pixel), green emitting sub-pix and blue-light-emitting sub-pix.And by the liquid crystal cell that constitutes each pixel or each sub-pix is moved as a kind of optical shutter (light valve), promptly also control from the light transmission rate of the illumination light (for example white light) of backlight ejaculation by the light transmission rate (numerical aperture) of each pixel of control or each sub-pix, thus display image.
In the past, backlight throws light on to entire liquid crystal display device with even and fixing brightness, but for example by TOHKEMY 2004-258403 backlight with this backlight different structure is disclosed, promptly by with constitute liquid crystal indicator in the corresponding a plurality of light source cells in the unit, a plurality of viewing area of viewing area constitute, have the backlight of the structure that the distribution that makes the illumination in the unit, viewing area changes.
And, by this backlight lamp control (being also referred to as the backlight division driving), can realize that the contrast that is caused by the reduction of the increase of the white level in the liquid crystal indicator, black level increases, its result can realize the raising of image displaying quality, the reduction of backlight power consumption.
Patent documentation 1: TOHKEMY 2004-258403
Summary of the invention
The problem that invention will solve
In liquid crystal indicator, according to the input signal that is input to drive division from the outside, provide the control signal of light transmission rate of control pixel from drive division to each pixel, but, can consider to control according to following illustrated method about the backlight of division driving.That is, the maximum brightness of establishing each light source cell that constitutes backlight is Y
Max, and the maximal value (specifically for example being 100%) of establishing the light transmission rate (numerical aperture) of the pixel in the unit, viewing area is Lt
MaxIn addition, the maximum brightness when each light source cell of establishing the formation backlight is Y
MaxThe time, be used for trying to achieve the display brightness y of each pixel of unit, viewing area
0The light transmission rate (numerical aperture) of each pixel be Lt
0Thereby, in this case, control so that constitute the light-source brightness Y of each light source cell of backlight
0Satisfy:
Y
0·Lt
max＝Y
max·Lt
0
In addition, at (A) of Figure 10 with the concept map of this control has been shown (B).At this, make the light-source brightness Y of light source cell
0Each frame (being called the pixel display frame for convenience) in the image demonstration of liquid crystal indicator is changed respectively.
Suitable with the maximal value in a plurality of control signals that offer a plurality of pixels that constitute the unit, viewing area, (value is: x will to be called maximum input signal in the unit, viewing area from the input signal of outside input
U-max).And, suppose the value x of maximum input signal in the unit, viewing area of (being called (A+1) number unit, viewing area for convenience), certain unit, viewing area
U-maxBe bigger value x
H, the value x of maximum input signal in the unit, viewing area of (adjacency) unit, viewing area (being called unit, A viewing area and (A+2) number unit, viewing area for convenience) adjacent with this unit, viewing area
U-maxBe less value x
LThat is, the light-source brightness with this (A+1) number (A+1) number light source cell that the unit, viewing area is corresponding is higher value Y
H, on the other hand, corresponding with A number and (A+2) number unit, viewing area A number and the light-source brightness of (A+2) number light source cell are lower value Y
LIn (A) of Figure 11, schematically show the state of the input signal of the light transmission rate (numerical aperture) that is used for controlling the pixel that constitutes unit, this viewing area, in (B) of Figure 11, schematically show the state of light-source brightness.
But, the light transmission rate of liquid crystal cell can not become " 0 " usually fully.Even therefore input signal is made as minimum, the light transmission rate of each pixel or each sub-pix (numerical aperture) can not reach minimum yet, and the light that can produce from the liquid crystal cell leaks.Its result in (A+1) number unit, viewing area, and is maximum input signal in the unit, viewing area to the suitable input signal of the control signal of certain pixel, and has bigger value x
H, on the other hand, supposing provides and lower value x other pixel that constitutes this (A+1) number unit, viewing area
LThe suitable control signal of input signal, suppose constituting A number and all pixels of (A+2) number unit, viewing area also provide and lower value x
LThe suitable control signal (with reference to (A) of Figure 11) of input signal.In this case, as (C) of Figure 11 schematically illustrates display brightness, although other pixel that constitutes (A+1) number unit, viewing area is provided and lower value x
LThe suitable control signal of input signal, display brightness still is higher than desired display brightness (in (C) of Figure 11 with value yy in this part
LExpression).Its result is although the value of input signal is identical value x
L, with constitute A number and the pixel of (A+2) number unit, viewing area in display brightness (in (C) at Figure 11 to be worth y
LExpression) also can produce difference between.When producing this phenomenon, can observe and appear the black display part in one's mind, can't obtain same low display brightness state, image displaying quality descends.
Therefore, the object of the present invention is to provide a kind of display device and driving method thereof, it is near the existence expansion of darker image displaying part branch under the situation of bright image displaying part, can make the state homogenising as far as possible of the display brightness of darker image displaying part.
The scheme that is used to deal with problems
Be used to realize the display device of the present invention of above-mentioned purpose, or the display device in the driving method of the display device relevant with first mode to the, 3 modes of the present invention possesses:
(a) display part is by the liquid crystal indicator of the infiltration type with viewing area that the pixel that is rectangular arrangement constitutes and constitute;
(b) backlight is by light source cell independent configuration constitutes with the unit, a plurality of viewing area that constitutes the viewing area is corresponding, to throwing light at the back side of display part; And
(c) drive division, drive display part and backlight according to input signal from the outside, this drive division has control part, this control part is controlled the luminance of the light source cell corresponding with this unit, viewing area according to maximum input signal in the unit, peaked viewing area that has in the input signal corresponding with each unit, viewing area.
And, in display device of the present invention, it is characterized in that, the control part investigation value of maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have a maximum input signal in the unit, viewing area value with identical greater than the 2nd setting of the 1st setting or greater than the unit, high brightness luminescent viewing area of the 2nd setting, around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.
In addition, in the driving method of display device of the present invention, it is characterized in that, in its control part, the value of investigation maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have a maximum input signal in the unit, viewing area value with identical greater than the 2nd setting of the 1st setting or greater than the unit, high brightness luminescent viewing area of the 2nd setting, around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.
The effect of invention
In the present invention, the position of satisfying between certain conditions and unit, low-light level luminous display area territory and the unit, high brightness luminescent viewing area in unit, low-light level luminous display area territory concerns when satisfying concerning of stipulating, makes the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.Therefore, even exist near the distribution range of darker image displaying part under the situation of bright image displaying part, also can make the state homogenising as far as possible of the display brightness of darker image displaying part, can avoid observing the generation that the part is appeared the black display part in one's mind and be can not get same low display brightness state, problem that image displaying quality descends reliably.
Description of drawings
(A) of Fig. 1, (B), (C) and (D) be the figure of the state of the state of state driving method, that schematically show the light transmission rate (numerical aperture) in the pixel that constitutes the unit, viewing area that is respectively applied for the display device among explanation embodiment 1 or the embodiment 2, light-source brightness and display brightness.
(A) of Fig. 2, (B), (C) and (D) be the figure of the state of the state of state driving method, that schematically show the light transmission rate (numerical aperture) in the pixel that constitutes the unit, viewing area that is respectively applied for the display device among the explanation embodiment 3, light-source brightness and display brightness.
Fig. 3 is the process flow diagram of driving method that is used for illustrating the display device of embodiment 1.
Fig. 4 is the concept map of the display device that is made of fit for service color liquid crystal display arrangement among the embodiment and backlight.
Fig. 5 is the concept map by the part of the fit for service driving circuit among the embodiment.
(A) of Fig. 6 is the configuration of light emitting diode in the backlight of schematically illustrated embodiment etc., the figure of ordered state, and (B) of Fig. 6 is the schematic partial section of the display device that constitutes of color liquid crystal display arrangement and the backlight by embodiment.
Fig. 7 is the schematic partial section of color liquid crystal display arrangement.
(A) of Fig. 8 and (B) be used to illustrate for obtain by light source cell hypothesis pixel is provided have with the unit, viewing area in the value x of maximum input signal
U-maxDisplay brightness the 2nd setting y during the suitable control signal of the input signal of the value that equates
2, and under the control of drive division the increase and decrease light source cell light-source brightness Y
2The concept map of state.
(A) of Fig. 9 is that the schematically illustrated value that will import the input signal of liquid crystal indicator driving circuit in order to drive sub-pix is asked value (the ≡ x behind the power 2.2 times
2.2) and dutycycle (=t
ON/ t
Const) between the figure of relation, (B) of Fig. 9 schematically shows the value X of control signal of the light transmission rate that is used to control sub-pix and the figure of the relation between the display brightness y.
(A) of Figure 10 and (B) be the concept map that is used for illustrating the relation between the display brightness of the light-source brightness of backlight, the light transmission rate of pixel (numerical aperture) and unit, viewing area.
(A) of Figure 11, (B) and (C) be the figure of the state of the state of the state that is respectively applied for the light transmission rate (numerical aperture) in explanation pixel the problems of the prior art, unit, schematically illustrated formation viewing area, light-source brightness and display brightness.
Description of reference numerals
10: color liquid crystal display arrangement; 11: the viewing area; 12: the unit, viewing area; 13: liquid crystal material; 20: front panel; 21: the 1 substrates; 22: color filter; 23: outer coating; 24: transparent the 1st electrode; 25: oriented film; 26: polarizing coating (
Light Off イ Le system); 30: rear panel; 31: the 2 substrates; 32: on-off element; 34: transparent the 2nd electrode; 35: oriented film; 36: polarizing coating; 37: insulation course; 40: backlight; 41,41R, 41G, 41B: light emitting diode (light source); 42: light source cell; 43,43R, 43G, 43B: photodiode (optical sensor); 44: the next door; 51: shell; 52A: the bottom surface of shell; 52B: the side of shell; 53: outer side frame; 54: inner side frame; 55A, 55B: pad; 56: guide member; 57: carriage member; 61: diffuser plate; 62: diffusion sheet; 63: prismatic lens; 64: the polarisation transformation sheet; 65: reflector plate; 70: backlight lamp control circuit (control part); 71: computing circuit; 72: memory storage (storer); 80: light source cell driving circuit (control part); 81: computing circuit; 82: memory storage (storer); The 83:LED driving circuit; 84: the photodiode driving circuit; 85R, 85G, 85B: on-off element; 86: the light emitting diode driving power; 90: the liquid crystal indicator driving circuit; 91: timing controller.
Embodiment
The best mode that is used to carry out an invention
[summary of embodiment]
The summary of embodiments of the present invention below is described.
With possess to the relevant display device of Third Way or with first mode to the display device in the driving method of the relevant display device of Third Way as first mode of an example of embodiments of the present invention as an example of embodiments of the present invention:
(a) display part is by the liquid crystal indicator of the infiltration type with viewing area that the pixel that is rectangular arrangement constitutes and constitute;
(b) backlight is by light source cell independent configuration constitutes with the unit, a plurality of viewing area that constitutes the viewing area is corresponding, to throwing light at the back side of display part; And
(c) drive division drives display part and backlight according to the input signal from the outside.And drive division has control part, and this control part is controlled luminance with the corresponding light source cell in this unit, viewing area according to maximum input signal in the unit, peaked viewing area that has in the input signal corresponding with each unit, viewing area.
In addition, in the following description, sometimes unit, a plurality of viewing area (unit, viewing area that this unit, viewing area is a kind of hypothesis) is called unit, P * Q viewing area, in this case, the quantity of light source cell is P * Q.In addition, sometimes the value of maximum input signal is designated as " x in the unit, viewing area in the input signal that will be corresponding with unit, 1 viewing area (quantity of input signal equates that with the pixel quantity that constitutes this unit, viewing area perhaps the quantity with the sub-pix that constitutes this unit, viewing area equates)
U-max".And then, sometimes with the value x of maximum input signal in the unit, viewing area (in the unit, viewing area the quantity of maximum input signal be P * Q)
U-maxAmong mxm. be designated as x
MAX
In addition, with the value (x of maximum input signal in the unit, viewing area
U-max) smaller or equal to the 1st setting (PD
1) the unit, viewing area be called " unit, low-light level luminous display area territory ", with the value (x of maximum input signal in the unit, viewing area
U-max) be equal to or greater than the 2nd setting (PD
2) the unit, viewing area be called " unit, high brightness luminescent viewing area ", wherein the 2nd setting is greater than the 1st setting (PD
2PD
1).And then, be under the situation of color liquid crystal display arrangement at liquid crystal indicator, 1 pixel for example is made of these three sub-pixs of emitting red light sub-pix, green emitting sub-pix and blue-light-emitting sub-pix.Therefore, input signal also with the input signal that is used for the emitting red light sub-pix, these three kinds of input signals of input signal of being used for the input signal of green emitting sub-pix and being used for the blue-light-emitting sub-pix as one group, in this case, the value (x of maximum input signal in the unit, so-called viewing area
U-max), be meant in unit, a viewing area further maximum value among the value of the value of the input signal that is used for the green emitting sub-pix of the value of the maximum input signal that is used for the emitting red light sub-pix, maximum and the maximum input signal that is used for the blue-light-emitting sub-pix.
And, with the display device relevant as the 1st mode of an example of embodiments of the present invention in, the control part investigation value of maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have a maximum input signal in the unit, viewing area value with identical greater than the 2nd setting of the 1st setting or greater than the unit, high brightness luminescent viewing area of the 2nd setting, around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.
In addition, with driving method as the relevant display device of the 1st mode of an example of embodiments of the present invention in, by the control part investigation value of maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have unit, high brightness luminescent viewing area, around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.
And then, be preferably the control part investigation and whether have unit, low-light level luminous display area territory, and investigate around unit, low-light level luminous display area territory whether have unit, high brightness luminescent viewing area, carry out above-mentioned processing according to this investigation result.
In addition, with the display device relevant as the 2nd mode of an example of embodiments of the present invention in, control part is obtained the ratio (RT of unit, low-light level luminous display area territory with respect to unit, whole viewing area
1), and whether investigation exists unit, high brightness luminescent viewing area, the ratio (RT in unit, low-light level luminous display area territory around unit, low-light level luminous display area territory
1) more than or equal to setting (RT
0) and around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.
And then, in driving method, obtain the ratio (RT of unit, low-light level luminous display area territory with respect to unit, whole viewing area by control part as the related display device of the 2nd mode of an example of embodiments of the present invention
1), and whether investigation exists unit, high brightness luminescent viewing area, the ratio (RT in unit, low-light level luminous display area territory around unit, low-light level luminous display area territory
1) more than or equal to setting (RT
0) and around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory by control part.
And then, with the display device relevant as the 3rd mode of an example of embodiments of the present invention in, control part is obtained the ratio (RT of unit, low-light level luminous display area territory with respect to unit, whole viewing area
1), and investigation unit, high brightness luminescent viewing area whether with a plurality of continuous adjacent existence in unit, low-light level luminous display area territory, ratio (RT in unit, low-light level luminous display area territory
1) more than or equal to setting (RT
0) and the situation of the existence high brightness luminescent viewing area unit adjacent with a plurality of continuous unit, low-light level luminous display area territory under, carry out following processing: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.
In addition, with driving method as the relevant display device of the 3rd mode of an example of embodiments of the present invention in, obtain the ratio (RT of unit, low-light level luminous display area territory by control part with respect to unit, whole viewing area
1), and investigation unit, high brightness luminescent viewing area whether with the adjacent existence in unit, low-light level luminous display area territory, ratio (RT in unit, low-light level luminous display area territory
1) more than or equal to setting (RT
0) and the situation of the existence high brightness luminescent viewing area unit adjacent with a plurality of continuous unit, low-light level luminous display area territory under, carry out following processing: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.
Usually, be worth x at input signal x greater than certain
ThThe time, each pixel (or each sub-pix) is carried out can be with 1 function representation of input signal x based on the light transmission rate (numerical aperture) before the correction of γ (gamma) characteristic.But x is worth x smaller or equal to certain at input signal
ThSituation under, the minimizing ratio of light transmission rate (numerical aperture) is less than the minimizing ratio of input signal x.Promptly be worth x smaller or equal to certain at input signal x
ThSituation under, depart from 1 function of input signal x.With the display device or its driving method relevant as the 1st mode to the 3 modes of an example of embodiments of the present invention in, the 1st setting (PD
1) for example can be made as this certain value x
ThValue after the standardization.Or, more particularly, the 1st setting (PD
1) can be mxm. x smaller or equal to input signal
In-max25%, be preferably value smaller or equal to 15%.At this, the mxm. x of so-called input signal
In-max, for example gray-scale Control is being carried out under the situation of 8 controls, carry out gray-scale Control, the mxm. x of input signal with 0 to 255 28 grades
In-maxBe exactly the value suitable with " 255 ".
In addition, comprise above-mentioned preferred structure, with the display device or its driving method relevant as the 1st mode to the 3 modes of an example of embodiments of the present invention in, the 2nd setting (PD
2) can be greater than the value x of maximum input signal in the unit, viewing area
U-maxIn mxm. x
MAX25%.
In comprising various optimal way discussed above, structure and relevant as the 2nd mode to the 3 modes of an example of embodiments of the present invention display device or its driving method, setting (RT
0) depend on the characteristic of light source.That is, under the situation that makes the little light source of the scope of using up, appear the black display part in one's mind, therefore need make setting (RT even when the scope (area) of low-light level part is little, also can observe
0) diminish.On the other hand, make the scope of using up big, can be brightly under the situation to the light source that throw light at a distance, appear the black display part in one's mind even when the scope (area) of the part of low-light level is big, also be difficult to observe, therefore can make setting (RT
0) become big.Thereby, setting (RT
0) can be by carrying out various tests, investigation low-light level part scope (area) with observe the relation of appearing in one's mind between the black display phenomenon partly and determine.
Brightness (display brightness) y of following light transmission rate (the being also referred to as numerical aperture) Lt that defines pixel or sub-pix like that, part that the unit, viewing area is corresponding with pixel or sub-pix and brightness (light-source brightness) Y of light source cell.
Y
1Be for example maximum brightness of light-source brightness, be called as light-source brightness the 1st setting below sometimes.
Lt
1Be for example maximal value of the light transmission rate (numerical aperture) of pixel in the unit, viewing area or sub-pix, below be called as light transmission rate the 1st setting sometimes.
Lt
2Be to be light-source brightness the 1st setting Y at light-source brightness
1The time, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (value is x
U-max) pixel during suitable control signal or the light transmission rate (numerical aperture) of sub-pix, below be called as light transmission rate the 2nd setting sometimes.In addition, 0≤Lt
2≤ Lt
1
y
2Be to suppose that light-source brightness is light-source brightness the 1st setting Y
1, pixel or sub-pix light transmission rate (numerical aperture) be light transmission rate the 2nd setting Lt
2The time resulting display brightness, below be called as display brightness the 2nd setting sometimes.
Y
2Be hypothesis pixel or sub-pix are provided with the unit, viewing area in maximum input signal (value is x
U-max) suitable control signal and the pixel of hypothesis this moment or the light transmission rate (numerical aperture) of sub-pix be corrected as light transmission rate the 1st setting Lt
1The time, be used for the brightness of pixel or sub-pix is made as display brightness the 2nd setting (y
2) the light-source brightness of light source cell.Wherein, sometimes to light-source brightness Y
2The correction of the light-source brightness of each light source cell to the influence of the light-source brightness of other light sources unit considered in enforcement.
With the display device or its driving method relevant as the 1st mode of an example of embodiments of the present invention in, whether there is unit, low-light level luminous display area territory by the control part investigation, in this case, even there is unit, a low-light level luminous display area territory, also think to have unit, low-light level luminous display area territory.In addition, around unit, low-light level luminous display area territory, whether there is unit, high brightness luminescent viewing area by the control part investigation, at this, " on every side " of unit, so-called low-light level luminous display area territory, be meant in the adjacent situation in unit, high brightness luminescent viewing area and unit, a low-light level luminous display area territory, perhaps the adjacent state of an end of unit, high brightness luminescent viewing area and continuous R (wherein R is the integer more than or equal to 2) unit, low-light level luminous display area territory.Or be meant the state that between unit, low-light level luminous display area territory and unit, high brightness luminescent viewing area, has R ' individual (wherein, R ' is the integer more than or equal to 1) unit, viewing area (for convenience, be called in the middle of viewing area unit).Unit, middle viewing area in this case is the value (x with maximum input signal in the unit, viewing area
U-max) be greater than the 1st setting (PD
1) and less than the 2nd setting (PD
2) the unit, viewing area of value.
And then, in the 1st mode as an example of embodiments of the present invention, around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory, specifically, for example carry out following processing.That is, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (wherein, its value x
U-maxBe greater than x
MAXValue) suitable control signal, and the pixel of hypothesis this moment or the light transmission rate (numerical aperture) of sub-pix are corrected as light transmission rate the 1st setting Lt
1, at this moment, obtain to be used to make the brightness of pixel or sub-pix to become display brightness the 2nd setting (y
2) the light-source brightness of light source cell (be designated as Y sometimes
2') processing.Then the light source cell corresponding with unit, whole low-light level luminous display area territory being carried out this processing gets final product.And then, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (value is x
U-max) suitable control signal, and suppose that the pixel of this moment or the light transmission rate (numerical aperture) of sub-pix are corrected as light transmission rate the 1st setting Lt
1, at this moment, can make the brightness of pixel or sub-pix become display brightness the 2nd setting (y to being used to
2) the light-source brightness of light source cell do not reach light-source brightness Y
2' all light source cells make light-source brightness reach Y
2' processing.In addition, in the light source cell beyond it, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (value is x
U-max) suitable control signal, and suppose that the pixel of this moment or the light transmission rate (numerical aperture) of sub-pix are corrected as light transmission rate the 1st setting Lt
1, at this moment, can obtain to be used to make the brightness of pixel or sub-pix to become display brightness the 2nd setting (y
2) the light-source brightness Y of light source cell
2Processing.
With the display device or its driving method relevant as the 2nd mode of an example of embodiments of the present invention in, around unit, low-light level luminous display area territory, whether there is unit, high brightness luminescent viewing area by the control part investigation, at this, " on every side " of unit, so-called low-light level luminous display area territory, be meant in the adjacent situation in unit, high brightness luminescent viewing area and unit, a low-light level luminous display area territory, perhaps the adjacent state of an end of unit, high brightness luminescent viewing area and continuous R (wherein R is the integer more than or equal to 2) unit, low-light level luminous display area territory.Or be meant the state that between unit, low-light level luminous display area territory and unit, high brightness luminescent viewing area, has unit, viewing area in the middle of the R ' individual (wherein, R ' is the integer more than or equal to 1).In addition, at the ratio (RT of unit, low-light level luminous display area territory
1) more than or equal to setting (RT
0) and around unit, low-light level luminous display area territory, exist under the situation of unit, high brightness luminescent viewing area, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory, specifically, for example can carry out and illustrated identical processing in as the 1st mode of an example of embodiments of the present invention.In addition, in the 2nd mode as an example of embodiments of the present invention, the ratio (RT in the unit of obtaining, low-light level luminous display area territory with respect to unit, whole viewing area
1) more than or equal to setting (RT
0) situation under, therefore the processing that the brightness of the light source cell corresponding with unit, low-light level luminous display area territory is increased can access more natural image and show.
In the display device or its driving method related as the 3rd mode of an example of embodiments of the present invention, carry out following processing by control part: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.Specifically, R (wherein R is the integer more than or equal to 2) the continuous unit, low-light level luminous display area territory that will be benchmark with the position of unit, high brightness luminescent viewing area is made as unit, No. 1 low-light level luminous display area territory, unit, No. 2 low-light level luminous display area territory, ..., (R-1) number unit, low-light level luminous display area territory, unit, R low-light level luminous display area territory, at this moment, with r number (wherein, r=1,2, ... in the light source cell of unit, R) low-light level luminous display area territory correspondence, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (value is x "
U-max (r)) suitable control signal, and suppose that the pixel of this moment or the light transmission rate (numerical aperture) of sub-pix are corrected as light transmission rate the 1st setting Lt
1, at this moment, try to achieve and be used to make the brightness of pixel or sub-pix to become display brightness the 2nd setting (y
2) the light-source brightness of light source cell (be designated as Y sometimes
2(r) " processing).At this, the value x of maximum input signal in the unit, viewing area "
U-max (r)Satisfy
X "
U-max (r)=β
1 rX
MAX(wherein, 0＜β 1＜1)
Perhaps,
X "
U-max(r)=(1-β
2R) x
MAX(wherein, 0＜β
2＜1)
Get final product.In addition, in the 3rd mode as an example of embodiments of the present invention, the ratio (RT in the unit of obtaining, low-light level luminous display area territory with respect to unit, whole viewing area
1) more than or equal to setting (RT
0) situation under, therefore the processing that the brightness of the light source cell corresponding with unit, low-light level luminous display area territory is increased step by step can access more natural image and show.
In the 1st mode as an example of embodiments of the present invention, around unit, low-light level luminous display area territory, do not exist under the situation of unit, high brightness luminescent viewing area, all for example carrying out following processing in the light source cells.In addition, in the 2nd mode as an example of embodiments of the present invention, the ratio (RT in unit, low-light level luminous display area territory
1) less than setting (RT
0) or around unit, low-light level luminous display area territory, do not exist under the situation of unit, high brightness luminescent viewing area, all for example carrying out following processing in the light source cell.And then, in the 3rd mode as an example of embodiments of the present invention, the ratio (RT in unit, low-light level luminous display area territory
1) less than setting (RT
0) or in unit, high brightness luminescent viewing area not with the adjacent existence in unit, low-light level luminous display area territory or under unit, low-light level luminous display area territory is not a plurality of, continuous situation, also all for example carrying out following processing in the light source cells.That is, suppose to pixel or sub-pix provide with the unit, viewing area in maximum input signal (value is x
U-max) suitable control signal, and suppose that the pixel of this moment or the light transmission rate (numerical aperture) of sub-pix are corrected as light transmission rate the 1st setting Lt
1, at this moment, obtain to be used to make the brightness of pixel or sub-pix to become display brightness the 2nd setting (y
2) the light-source brightness Y of light source cell
2Processing.
In comprising optimal way discussed above, structure and relevant as the 1st mode to the 3 modes of an example of embodiments of the present invention display device or its driving method, 1 light source cell is surrounded by 4 light source cells, perhaps 1 side by 3 light source cells and shell (back explanation) is surrounded, and perhaps 2 sides by 2 light source cells and shell are surrounded.And, exist around the unit, low-light level luminous display area territory under unit, high brightness luminescent viewing area or unit, the high brightness luminescent viewing area situation adjacent with unit, low-light level luminous display area territory, unit, high brightness luminescent viewing area can be with a certain at least direction existence or adjacent in eight directions (horizontal, vertical, oblique) that is benchmark of unit, low-light level luminous display area territory.
Example as embodiments of the present invention, as the light source of the light source cell that constitutes backlight, can enumerate light emitting diode (LED) or also can enumerate cold cathode line style fluorescent light, electroluminescence (EL) device, cold cathode electric field electron emitting device (FED), plasma display system, common lamp.Constituting by light emitting diode under the situation of light source, can be with the red light emitting diodes of the red light of for example sending wavelength 640nm, for example send the green LED of green light of wavelength 530nm and the blue LED that for example sends the blue light of wavelength 450nm and constitute light source as one group and obtain white light, also can pass through the luminous of white light-emitting diode (for example, ultraviolet ray or blue LED and fluorophor particle combination being sent the light emitting diode of white light) and obtain white light.Can also possess the redness sent, green, the 4th kind of color, the 5th kind of color beyond blue ... the light emitting diode of light.
In addition, constituting under the situation of light source, sending a plurality of red light emitting diodes of red light, a plurality of blue LEDs that send a plurality of green LEDs of green light and send blue light are configured to arrange in the enclosure by light emitting diode.More particularly, can constitute light source by the light emitting diode that (red light emitting diodes, a green LED, a blue LED), (red light emitting diodes, two green LEDs, a blue LED), (two red light emitting diodes, two green LEDs, a blue LED) etc. constitute.In a light source cell, possesses a light emitting diode at least.
Light emitting diode can possess the so-called structure that faces up, and also can have flip-chip structure.That is, light emitting diode is made of substrate and the luminescent layer that is formed on the substrate, can constitute from luminescent layer to the radiative mechanism in outside, also can constitute light from luminescent layer by the structure of substrate to external emission.More particularly, light emitting diode (LED) has the 1st coating that for example is formed on the compound semiconductor layer by having the 1st conductivity type (for example n type) on the substrate and constitutes, be formed on active layer on the 1st coating, be formed on the stepped construction of the 2nd coating that is made of the compound semiconductor layer with the 2nd conductivity type (for example p type) on the active layer, possesses the 1st electrode that is electrically connected with the 1st coating and the 2nd electrode that is electrically connected with the 2nd coating.The layer that constitutes light emitting diode can depend on that emission wavelength is made of known compound semiconductor materials.
As an example of embodiments of the present invention, be preferably the optical sensor that disposes the luminance that is used to measure light source (specifically, for example the brightness of the colourity of the brightness of light source or light source or light source and colourity).The minimum number of optical sensor is 1 and gets final product, but from measuring the luminance aspect consideration of each light source cell reliably, is preferably the structure that 1 light source cell is disposed 1 group of optical sensor.As optical sensor, can enumerate known photodiode, CCD device etc.To for example be made of as 1 group under the situation of light source red light emitting diodes, green LED and blue LED, the luminance of the light source of measuring by optical sensor is the brightness and the colourity of light source.In addition, in this case, the 1 group of optical sensor photodiode that can the photodiode of green filter be installed by the photodiode that red filter has been installed for the light intensity of measuring red light, for the light intensity of measuring green light and blue filter has been installed for the light intensity of measuring blue light constitutes.
The drive division that comprises control part can be by for example being made of the control circuit (as the backlight lamp control circuit and the light source cell control circuit of control part) and the liquid crystal indicator driving circuit that is made of known circuit such as timing controllers of width modulation (PWM) signal generating circuit, control circuit of duty ratio, light emitting diode (LED) control circuit, computing circuit, memory storage formations such as (storeies).
Backlight can also be made as possess diffuser plate, the optical function sheet group that diffusion sheet, prismatic lens, polarisation transformation sheet are such, the structure of reflector plate.
The control of the brightness (light-source brightness) of brightness of pixel (display brightness) and light source cell is carried out respectively per 1 image display frame.In addition, the quantity (per second image) of delivering to the image information of drive division as electric signal during 1 second is frame rate (frame rate), and the inverse of frame rate is frame time (unit be second).
The liquid crystal indicator of infiltration type for example by the front panel that possesses transparent the 1st electrode, possess the rear panel of transparent the 2nd electrode and be configured in front panel and rear panel between liquid crystal material constitute.
More particularly, front panel is for example by constituting with the lower part: the 1st substrate that is made of glass substrate, silicon substrate, transparent the 1st electrode (be also referred to as common electrode, for example be made of ITO) of the inside surface that is arranged on the 1st substrate and the polarizing coating that is arranged on the outside surface of the 1st substrate.And then in the infiltration type color liquid crystal display arrangement, the inside surface of the 1st substrate is provided with the color filter of the outer coating covering that is made of acrylic resin, epoxy resin.As the configuration pattern of color filter, can enumerate triangle arrangement, bar shaped arrangement, diagonal angle arrangement, rectangular arranged.And front panel also further has the structure that forms transparent the 1st electrode on outer coating.In addition, on transparent the 1st electrode, be formed with oriented film.On the other hand, more particularly, rear panel is for example by constituting with the lower part: the 2nd substrate that is made of glass substrate, silicon substrate, the on-off element that is formed on the 2nd substrate inside surface, by transparent the 2nd electrode (be also referred to as pixel electrode, for example be made of ITO) of on-off element control conduction/non-conduction and the polarizing coating that is arranged on the outside surface of the 2nd substrate.Be formed with oriented film comprising on the whole surface of transparent the 2nd electrode.The various parts, the liquid crystal material that constitute the liquid crystal indicator that comprises these infiltration type color liquid crystal display arrangements can be made of known parts, material.As on-off element, can example illustrate: 2 terminal components such as such 3 terminal components of the MOS type FET that on the monocrystalline silicon semiconductor substrate, forms, thin film transistor (TFT) (TFT), MIM element, resistance change element, diode.
As the repeat region of transparent the 1st electrode and transparent the 2nd electrode and comprise that the zone of liquid crystal cell and 1 pixel (pixel) or 1 sub-pix (sub-pixel) are corresponding.And in the infiltration type color liquid crystal display arrangement, the emitting red light sub-pix (sub-pix [R]) that constitutes each pixel (pixel) by the relevant range and see through the constituting of red color filter, green emitting sub-pix (sub-pix [G]) by the relevant range and see through the constituting of green color filter, blue-light-emitting sub-pix (sub-pix [B]) is by the relevant range and see through constituting of blue color filter.The configuration pattern of sub-pix [R], sub-pix [G] and sub-pix [B] is consistent with the configuration pattern of above-mentioned color filter.In addition, pixel is not necessarily by the emitting red light sub-pix, these three sub-pixs of green emitting sub-pix and blue-light-emitting sub-pix are as 1 group of formation, for example also can (for example, add 1 group of the sub-pix that sends white light in order to improve brightness by these 3 sub-pixs further being added behind one or more sub-pixs 1 group, added 1 group of the sub-pix that sends complementary color light in order to enlarge the color rendering scope, added 1 group of the sub-pix that sends sodium yellow in order to enlarge the color rendering scope, added 1 group of the sub-pix that sends sodium yellow and cyan light in order to enlarge the color rendering scope) constitute.
With (M0, when N0) coming mark with the quantity M0 of the pixel (pixel) of rectangular arrangement * N0, as (M0, value N0), specifically, can VGA (640 be shown example, 480), S-VGA (800,600), XGA (1024,768), APRC (1152,900), S-XGA (1280,1024), U-XGA (1600,1200), HD-TV (1920,1080), Q-XGA (2048,1536), and other (1920,1035), (720,480), (1280,960) etc. several images show use resolution, still also is not limited to these values.In addition, (M0, value N0) is with (P, the relation between value Q) can be illustrated in out in the following table 1 though do not limit.Pixel quantity as constituting unit, 1 viewing area can example illustrate 20 * 20 to 320 * 240, be preferably 50 * 50 to 200 * 200.Pixel quantity in the unit, viewing area can be fixed, also can be different.
Table 1
| The value of P | The value of Q | |
| VGA(640，480) | 2～32 | 2～24 |
| S-VGA(800，600) | 3～40 | 2～30 |
| XGA(1024，768) | 4～50 | 3～39 |
| APRC(1152，900) | 4～58 | 3～45 |
| S-XGA(1280，1024) | 4～64 | 4～51 |
| U-XGA(1600，1200) | 6～80 | 4～60 |
| HD-TV(1920，1080) | 6～86 | 4～54 |
| Q-XGA(2048，1536) | 7～102 | 5～77 |
| (1920，1035) | 7～64 | 4～52 |
| (720，480) | 3～34 | 2～24 |
| (1280，960) | 4～64 | 3～48 |
Example as embodiments of the present invention, the position of satisfying between certain conditions and unit, low-light level luminous display area territory and the unit, high brightness luminescent viewing area in unit, low-light level luminous display area territory concerns when satisfying concerning of stipulating, makes the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory.Therefore, even exist near the scope that darker image displaying part branch distributes under the situation of bright image displaying part, also can make the state homogenising as far as possible of the display brightness of darker image displaying part, can avoid can not get same low display brightness state reliably and the generation of the problem that image displaying quality descends.
And then, hypothesis pixel provided have with the unit, viewing area in the value x of maximum input signal
U-maxDuring the suitable control signal of the input signal of the value that equates, in order to obtain pixel intensity (light transmission rate the 1st setting Lt of this moment
1In display brightness the 2nd setting y
2) and constitute the brightness of the light source of the light source cell corresponding with the unit, viewing area by drive division control, therefore not only can realize the reduction of backlight power consumption, and owing to can realize the increase of white level, the reduction of black level, can access high-contrast (in the picture surface of liquid crystal indicator, not comprising the complete black display part of external light reflection etc. and the brightness ratio of complete white display part), can give prominence to the lightness of desired viewing area, therefore can realize the raising of the quality that image shows.
[summary of display part and backlight]
Below, with reference to accompanying drawing, according to embodiment explanation display device as embodiments of the present invention, at first with reference to (A) of Fig. 4, Fig. 5, Fig. 6 and (B) and Fig. 7 the display part that fit for service in an embodiment is made of the color liquid crystal display arrangement of infiltration type, the summary of backlight are described.
Shown in the concept map of Fig. 4, the color liquid crystal display arrangement 10 of the infiltration type suitable with display part possesses along the 1st direction M
0Individual, along the 2nd direction N
0The viewing area 11 that individual total M0 * N0 pixel forms with rectangular arrangement.At this, be assumed to be viewing area 11 is divided into P * Q unit, imaginary viewing area 12.Each unit, viewing area 12 is made of a plurality of pixels.Specifically, for example, show as image satisfy the HD-TV standard with resolution, so that (M0, N0) mark is with the quantity M of the pixel (pixel) of rectangular arrangement
0* N
0The time, for example be (1920,1080).In addition, the viewing area 11 (representing with dot-and-dash line in Fig. 4) that is made of the pixel with rectangular arrangement is split into P * Q unit, imaginary viewing area 12 (border is represented by dotted lines).(P, value Q) for example is (19,12).Wherein, in order to simplify picture, the quantity of the unit, viewing area 12 among Fig. 4 (and following light source cell 42) is different with this value.(pixel of M * N) constitutes, and the quantity that constitutes the pixel of unit, 1 viewing area 12 for example is about 10,000 by a plurality of in each unit, viewing area 12.Each pixel constitutes as 1 group with the luminous a plurality of sub-pixs of different colours respectively.More particularly, each pixel is made of these three sub-pixs of emitting red light sub-pix (sub-pix [R]), green emitting sub-pix (sub-pix [G]) and blue-light-emitting sub-pix (sub-pix [B]).This infiltration type color liquid crystal display arrangement 10 drives with the line order.More particularly, color liquid crystal display arrangement 10 has scan electrode (extending along the 1st direction) and the data electrode (extending along the 2nd direction) with rectangular intersection, select scan electrode to scan to scan electrode input scan signal, data-signal (based on the signal of control signal) display image according to the input of data electrode constitutes 1 picture.
As among Fig. 7 schematically partial section shown, color liquid crystal display arrangement 10 by the front panel 20 that possesses transparent the 1st electrode 24, the rear panel 30 that possesses transparent the 2nd electrode 34 and be distributed in front panel 20 and rear panel 30 between liquid crystal material 13 constitute.
Front panel 20 is for example by constituting with the lower part: the 1st substrate 21 that is made of glass substrate and the polarizing coating 26 that is arranged on the outside surface of the 1st substrate 21.The inside surface of the 1st substrate 21 is provided with the color filter 22 of outer coating 23 coverings that are made of acrylic resin, epoxy resin, on outer coating 23, form transparent the 1st electrode and (be also referred to as common electrode, for example constitute by ITO) 24, on transparent the 1st electrode 24, be formed with oriented film 25.On the other hand, more particularly, rear panel 30 is for example by constituting with the lower part: the 2nd substrate 31 that is made of glass substrate, the on-off element (specifically thin film transistor (TFT), TFT) that is formed on the 2nd substrate 31 inside surfaces, by transparent the 2nd electrode (be also referred to as pixel electrode, for example be made of ITO) 34 of on-off element 32 control conduction/non-conduction be arranged on the polarizing coating 36 of the outside surface of the 2nd substrate 31.On the whole surface that comprises transparent the 2nd electrode 34, be formed with oriented film 35.Front panel 20 and rear panel 30 engage by encapsulant (not shown) at edge part.In addition, on-off element 32 might not be TFT, for example also can be made of the MIM element.In addition, the Reference numeral among the figure 37 is arranged on the insulation course between on-off element 32 and the on-off element 32.
These various parts, liquid crystal materials that constitute the infiltration type color liquid crystal display arrangement can be made of known parts, material, therefore omit detailed explanation.
Backlight (to the surface light source apparatus of mo(u)ld bottom half) 40 is by and P * Q light source cell 42 formations respectively configuration corresponding with P * Q unit, imaginary viewing area 12, each light source cell 42 from the back side pair and light source cell 42 corresponding display unit 12 throw light on.And the light source that possesses in light source cell 42 is controlled separately.In addition, backlight 40 is positioned at the below of color liquid crystal display arrangement 10, but in Fig. 4, color liquid crystal display arrangement 10 shows respectively with backlight 40.Configuration, the ordered state of the light emitting diodes in (A) of Fig. 6 in the schematically illustrated backlight 40 etc. are in the schematic partial section of the display device that is made of color liquid crystal display arrangement 10 and backlight 40 shown in (B) of Fig. 6.Light source is made of the light emitting diode 41 that drives according to width modulation (PWM) control mode.
As the schematic partial section that (B) of Fig. 6 illustrates display device, backlight 40 is made of the shell 51 that possesses outer side frame 53 and inner side frame 54.And the end of infiltration type color liquid crystal display arrangement 10 is clamped by pad 55A, 55B by outer side frame 53 and inner side frame 54 and is fixed.In addition, between side frame 53 and the inner side frame 54, dispose guide member 56 outside, become to make and be sandwiched in the structure that the color liquid crystal display arrangement 10 between outer side frame 53 and the inner side frame 54 does not misplace.On the top of the inside of shell 51, diffuser plate 61 is installed on the inner side frame 54 by pad 55C, carriage member 57.In addition, on diffuser plate 61, be laminated with diffusion sheet 62, prismatic lens 63, polarisation transformation sheet 64 these optical function sheet groups.
In 51 inside, possesses reflector plate 65 in the bottom.At this, this reflector plate 65 is configured to make its reflecting surface relative with diffuser plate 61, is installed on the bottom surface 52A of shell 51 with parts by not shown installation.Reflector plate 65 for example can be made of the silver-colored reflection enhancing coating with structure of stacked in order silver-colored reflectance coating, low refractive index film, high refractive index film on the plate substrate material.The light that reflector plate 65 reflection is penetrated from a plurality of light emitting diodes 41 (light source 41), by the light of the side 52B of shell 51 or next door 44 reflections that according to circumstances illustrate by (A) of Fig. 6.Like this, to carry out colour mixture from red light, green light and the blue light that a plurality of red light emitting diodes 41R (light source 41R), a plurality of green LED 41G (light source 41G) that send green light that send red light, a plurality of blue LED 41B (light source 41B) of sending blue light penetrate, and can access the high white light of colour purity as illumination light.This illumination light is by diffuser plate 61, diffusion sheet 62, prismatic lens 63, polarisation transformation sheet 64 these optical function sheet groups, from back side illuminaton color liquid crystal display arrangement 10.The light source cell 42 and the light source cell 42 that constitute backlight 40 are separated by next door 44.Next door 44 is installed on the bottom surface 52A of shell 51 with parts by not shown installation.
Near the 52A of the bottom surface of shell 51, dispose photodiode 43R, 43G, 43B as optical sensor.In addition, photodiode 43R is the photodiode that red filter is installed for the light intensity of measuring red light, photodiode 43G is the photodiode that green filter is installed for the light intensity of measuring green light, and photodiode 43B is the photodiode that blue filter is installed for the light intensity of measuring blue light.At this, configuration 1 group of optical sensor ( photodiode 43R, 43G, 43B) in 1 light source cell 42.By the light source 41R, the 41G that measure as photodiode 43R, the 43G of optical sensor, 43B, the luminance of 41B is brightness and the colourity of light emitting diode 41R, 41G, 41B.
The ordered state of light emitting diode 41R, 41G, 41B can be arranged a plurality of for example (for example to send red light in the horizontal direction with on the vertical direction side by side, wavelength 640nm) red light emitting diodes 41R, (for example sends green light, wavelength 530nm) green LED 41G and the blue LED 41B that sends blue light (for example, wavelength 450nm) are as 1 group light emitting diode.In addition, in this case, to 1 light emitting diode of 1 light source cell, 42 configurations.
As shown in Figure 4 and Figure 5, the drive division that is used for driving backlight 40 and color liquid crystal display arrangement 10 according to the input signal from outside (display circuit) is by constituting with the lower part: the backlight lamp control circuit 70 and the light source cell driving circuit 80 (being equivalent to control part) that the red light emitting diodes 41R, the green LED 41G that constitute backlight 40 and blue LED 41B are carried out conduction and cut-off control according to the pulse width modulation controlled mode, and liquid crystal indicator driving circuit 90.Backlight lamp control circuit 70 is made of computing circuit 71 and memory storage (storer) 72.Then, according to corresponding with each unit, the viewing area 12 maximal value x that has in the input signal
U-maxThe unit, viewing area in maximum input signal, the luminance of the light source cell 42 that control and this unit, viewing area 12 are corresponding.On the other hand, light source cell driving circuit 80 is made of computing circuit 81, memory storage (storer) 82, led drive circuit 83, photodiode control circuit 84, on-off element 85R, the 85G, 85B, the light emitting diode driving power (constant current power supply) 86 that are made of FET.These circuit of formation backlight lamp control circuit 70 and light source cell driving circuit 80 etc. can be known circuit etc.On the other hand, the liquid crystal indicator driving circuit 90 that is used to drive color liquid crystal display arrangement 10 is made of timing controller 91 such known circuits.In color liquid crystal display arrangement 10, possess (these are not shown) such as the gate drivers that is used to drive the on-off element 32 that constitutes by the TFT that constitutes the liquid crystal cell, source electrode drivers.Light emitting diode 41R in certain image display frame, 41G, the luminance of 41B is by photodiode 43R, 43G, 43B measures, from photodiode 43R, 43G, the output of 43B is imported into photodiode control circuit 84, at photodiode control circuit 84, become in the computing circuit 81 as light emitting diode 41R, 41G, the data (signal) of for example brightness of 41B and colourity, related data is sent to led drive circuit 83, control the light emitting diode 41R in the next image display frame, 41G, the luminance of 41B forms above such feedback mechanism.In addition, downstream at light emitting diode 41R, 41G, 41B, in series insert current detecting resistance rR, rG, rB with light emitting diode 41R, 41G, 41B, control light emitting diode driving power (constant current power supply) 86 action under the control of led drive circuit 83, change voltage into, make the voltage drop among resistance rR, rG, the rB become setting with the electrorheological that will flow through resistance rR, rG, rB.At this, 1 light emitting diode driving power (constant current power supply) 86 has been described among Fig. 5, be used for the light emitting diode driving power 86 of driven for emitting lights diode 41R, 41G, 41B respectively but in fact dispose.
The viewing area that is made of the pixel with rectangular arrangement is split into unit, P * Q viewing area, with " OK " and " row " performance during this state, we can say be divided into Q capable * unit, viewing area of P row.In addition, unit, viewing area 12 by a plurality of (pixel of M * N) constitutes, when showing this state with " OK " and " row ", we can say by N capable * M row pixel formation.In addition, will be with rectangular arrangement, be positioned at that q is capable, the p row (q=1 wherein, 2 ..., Q, p=1,2 ..., P) unit, viewing area, light source cell are designated as unit, viewing area 12 respectively
(q, p), light source cell 42
(q, p), to unit, viewing area 12
(q, p)Or light source cell 42 (q, the key element that p) is associated, project are given mark " (q, p) " or " (q, p) " sometimes.At this, sometimes with emitting red light sub-pix (sub-pix [R]), green emitting sub-pix (sub-pix [G]) and blue-light-emitting sub-pix (sub-pix [B]) are referred to as " sub-pix [R; G; B] ", sometimes will be in order to control sub-pix [R, G, B] action (specifically, for example control light transmission rate (numerical aperture)) and be input to sub-pix [R, G, B] the emitting red light control signal, the green emitting control signal, and the blue-light-emitting control signal is referred to as " control signal [R, G; B] ", sometimes will import the emitting red light sub-pix input signal of drive division in order to drive the sub-pix [R, G, B] that constitutes the unit, viewing area from the outside, green emitting sub-pix input signal and blue-light-emitting sub-pix input signal are referred to as " input signal [R; G, B] ".
Each pixel is made of as 1 group sub-pix [R] (emitting red light sub-pix), sub-pix [G] (green emitting sub-pix) and these three sub-pixs (subpixel) of sub-pix [B] (blue-light-emitting sub-pix), but in the explanation of following examples, with sub-pix [R, G, B] separately brilliance control (gray-scale Control) is made as 8 controls, be made as with 0～255 2
8Level is carried out.Thereby, be input into the value x of the input signal [R, G, B] of liquid crystal indicator driving circuit 90 for the sub-pix [R, G, B] in each pixel that drive to constitute each unit, viewing area 12 respectively
R, x
G, x
BBecome 2 respectively
8The value of level.In addition, be used to control the value S of the pulse-width modulated output signal of the red light emitting diodes 41R, the green LED 41G that constitute each light source cell and blue LED 41B fluorescent lifetime separately
R, S
G, S
BAlso become 2
8The value of level.Yet, be not limited thereto, for example also can be made as 10 controls, with 2 of 0-1023
10Level is carried out, and in this case, for example can be 4 times with the performance of 8 bit value.
Pixel is provided the control signal of control pixel light transmission rate Lt separately respectively from drive division.The control signal [R, G, B] of control sub-pix [R, G, B] light transmission rate Lt separately specifically, is provided respectively from 90 pairs of sub-pixs of liquid crystal indicator driving circuit [R, G, B].That is, in liquid crystal indicator driving circuit 90, input signal [R, G, B] the generation control signal [R, G, B] according to input provides (output) to give sub-pix [R, G, B] this control signal [R, G, B].In addition, owing to make the light-source brightness Y of light source cell 42
2Each image display frame is changed respectively, so control signal [R, G, B] has basically and asks 2.2 values behind the power to carry out based on light-source brightness Y to input signal [R, G, B]
2The value of correction (compensation) of variation.Then, by from the gate drivers of 91 pairs of color liquid crystal display arrangements 10 of timing controller of constituting liquid crystal indicator driving circuit 90 and source electrode driver with the known method [R that transmits control signal, G, B], drive the on-off element 32 that constitutes each sub-pix according to control signal [R, G, B], the voltage that transparent the 1st electrode 24 that constitutes the liquid crystal cell and transparent the 2nd electrode 34 are applied expectation, thereby light transmission rate (numerical aperture) Lt of a control sub-pix.At this, the value of control signal [R, G, B] is big more, and then light transmission rate (numerical aperture of the sub-pix) Lt of sub-pix [R, G, B] is just high more, and the value of the brightness (display brightness y) of sub-pix [R, G, B] is high more.That is, bright more by the image (normally a kind of point-like) of the light formation of passing through sub-pix [R, G, B].
Each image display frame, each unit, viewing area, each light source cell in the image demonstration of color liquid crystal display arrangement 10 are carried out display brightness y and light-source brightness Y
2Control.In addition, make the action of the action of the color liquid crystal display arrangement 10 in 1 image display frame and backlight 40 synchronous.
[embodiment 1]
In embodiment 1 or embodiment described later 2 to embodiment 3, the 1st setting (PD
1) be mxm. x smaller or equal to input signal
In-maxThe arbitrary value below 25%.In addition, establish the 2nd setting (PD
2) be the value x of maximum input signal in the unit, viewing area
U-maxIn mxm. x
MAX100% value, be mxm. x
MAXSelf.In addition, with 0 to 255 2
8Level is carried out gray-scale Control, so the mxm. x of input signal
In-maxBe the value suitable with " 255 ".
In addition, set example as other, if the 2nd setting (PD
2) be greater than the 1st setting (PD
1) value, then can establish the 1st setting (PD
1) be mxm. x smaller or equal to input signal
In-max25% value (for example 15%), establish the 2nd setting (PD
2) be mxm. x greater than input signal
In-max25% value (for example 85%).And then, make the 2nd setting (PD by input signal
2) under the situation about changing, also can preset lower limit make the 2nd setting (PD
2) be not below or equal to the 1st setting (PD
1).
Below, the driving method of the display device among the embodiment 1 is described with reference to Fig. 1, Fig. 3, Fig. 4 and Fig. 5.
[step-100]
The input signal [R, G, B] and the clock signal clk of 1 image display frame that sends from well-known display circuit such as scan converter are input into backlight lamp control circuit 70 and liquid crystal indicator driving circuit 90 (with reference to Fig. 4).In addition, input signal [R, G, B] is that the input light quantity that ought for example establish pick-up tube is y
InThe time, from the output signal of pick-up tube, also be the output signal of importing liquid crystal indicator driving circuit 90 from outputs such as for example broadcasting stations, for the light transmission rate Lt that controls pixel, can be with input light quantity y
InThe function of 0.45 power represent.And, be input into the value x of the input signal [R, G, B] of 1 image display frame of backlight lamp control circuit 70
R, x
G, x
BBe temporarily stored in the memory storage (storer) 72 that constitutes backlight lamp control circuit 70.In addition, the value x of the input signal [R, G, B] of 1 image display frame of input liquid crystal indicator driving circuit 90
R, x
G, x
BAlso be temporarily stored in the memory storage (not shown) that constitutes liquid crystal indicator driving circuit 90.
[step-110]
Then, in the computing circuit 71 that constitutes backlight lamp control circuit 70, the value of reading the input signal [R, G, B] that is stored in the memory storage 72, (p, q) individual (wherein, at first p=1, q=1) unit, viewing area 12 the
(q, p)In, in computing circuit 71, obtain the value x of maximum input signal in the unit, viewing area
U-max (q, p), this is worth x
U-max (q, p)Be to be used for drive constituting this (p, q) unit, individual viewing area 12
(q, p)Whole pixels in sub-pix [R, G, B]
(q, p)Input signal [R, G, B]
(q, p)Value x
R-(q, p), x
G-(q, p), x
B-(q, p)Interior maximal value.Then with the value x of maximum input signal in the unit, viewing area
U-max (q, p)Be stored in the memory storage 72.For whole m=1,2 ..., M, n=1,2 ..., N, promptly M * N pixel carried out this step.
For example, at x
R-(q, p)Be value, the x that is equivalent to " 110 "
G-(q, p)Be value, the x that is equivalent to " 250 "
B-(q, p)Be to be equivalent under the situation of value of " 50 " x
U-max (q, p)It is the value that is equivalent to " 250 ".
From (p, q)=(1,1) rise repeat this operation up to (P, Q) till, with unit, whole viewing area 12
(q, p)The value x of maximum input signal in the middle unit, viewing area
U-max (q, p)Be stored in the memory storage 72.
Simultaneously, in computing circuit 71, whether investigation exists the value x of maximum input signal in the unit, viewing area
U-max (q, p)Be the 1st setting (PD
1) following unit, low-light level luminous display area territory, even under the situation that has unit, 1 low-light level luminous display area territory to exist, also will be with its position (p, q) be stored in the memory storage 72, and exist sign to change to " 1 " unit, low-light level luminous display area territory from the initial value " 0 " that has resetted.And then in computing circuit 71, whether investigation exists the value x of maximum input signal in the unit, viewing area around unit, low-light level luminous display area territory
U-max (q, p)With the 2nd setting PD
2Identical or greater than the unit, high brightness luminescent viewing area of the 2nd setting, under the situation that has such unit, high brightness luminescent viewing area, with its position (p, q) be stored in the memory storage 72, and exist sign to change to " 1 " unit, high brightness luminescent viewing area from the initial value " 0 " that has resetted.
In addition, in embodiment 1, unit, high brightness luminescent viewing area in a certain direction of eight directions of unit, low-light level luminous display area territory with the situation of unit, low-light level luminous display area territory adjacent (adjacency) under, think around unit, low-light level luminous display area territory, to have unit, high brightness luminescent viewing area.
(A) of Fig. 1 schematically shows to exist in unit, low-light level luminous display area territory and is masked as " 1 " and unit, high brightness luminescent viewing area exists under the situation that is masked as " 1 ", is used for controlling the state of input signal of the light transmission rate (numerical aperture) of the pixel that constitutes the unit, viewing area, and (B) of Fig. 1 schematically shows the state of the light-source brightness (light-source brightness 1) in this state.In addition, with x
HThe value x that represents maximum input signal in the unit, viewing area of unit, high brightness luminescent viewing area
U-max, with x
LThe value x that represents maximum input signal in the unit, viewing area of unit, low-light level luminous display area territory
U-maxIn addition, under this state, the light-source brightness 1 of the light source cell corresponding with unit, high brightness luminescent viewing area is higher value Y
H, the light-source brightness 1 of corresponding with unit, low-light level luminous display area territory on the other hand light source cell is lower value Y
LThe desirable state of state representation of (B), (C) of the state of the light-source brightness 1 shown in Fig. 1 (B) and (C) of Fig. 1 described later, (D), Fig. 2, the light-source brightness shown in (D) (light-source brightness 1,2), display brightness.In practice, the light-source brightness of a certain light source cell can be subjected to the influence of the light-source brightness of other light source cell.In addition, in Fig. 1 or Fig. 2 described later, unit, high brightness luminescent viewing area and low-light level luminous display area territory cell list are shown unit, high brightness luminescent viewing area, unit, low-light level luminous display area territory, and the light source cell corresponding with them is expressed as high-luminance light source unit, low intensity light source unit.
[step-120]
Then, exist in unit, low-light level luminous display area territory and to be masked as " 1 " and unit, high brightness luminescent viewing area and to exist and be masked as under the situation of " 1 ", make the processing of the brightness increase of the light source cell corresponding, specifically, carry out following processing with unit, low-light level luminous display area territory.That is, specifically, imagination will (wherein, it be worth x ' with maximum input signal in the unit, viewing area
U-maxBe greater than x
MAXValue, in embodiment 2 described later, also be made as same) suitable control signal [R, G, B] offers sub-pix [R, G, B], and the light transmission rate (numerical aperture) of hypothesis sub-pix this moment [R, G, B] is corrected as light transmission rate the 1st setting Lt
1, obtain to be used for brightness with sub-pix [R, G, B] this moment and be made as display brightness the 2nd setting and (be y
2, in (D) of Fig. 1 with y
L' represent) the light-source brightness Y of light source cell
2' (in (C) of Fig. 1 with Y
L' represent) processing.That is, at light source cell driving circuit 80
(q, p)Control down increase or reduce the light-source brightness of light source cell.
Then, in embodiment 1, the light source cell corresponding with unit, whole low-light level luminous display area territory carried out this processing.And then imagination will (value be x with maximum input signal in the unit, viewing area
U-max) suitable control signal [R, G, B] offers sub-pix [R, G, B], and the light transmission rate (numerical aperture) of hypothesis sub-pix this moment [R, G, B] is corrected as light transmission rate the 1st setting Lt
1, be made as display brightness the 2nd setting (y to being used for the brightness of sub-pix [R, G, B] this moment
2) the light-source brightness of light source cell do not reach light-source brightness Y
2' whole light source cells make light-source brightness become Y
2' processing.In addition, in light source cell in addition, imagination will (value be x with maximum input signal in the unit, viewing area
U-max) suitable control signal [R, G, B] offers sub-pix [R, G, B], and the light transmission rate (numerical aperture) of hypothesis sub-pix this moment [R, G, B] is corrected as light transmission rate the 1st setting Lt
1, obtain to be used for the brightness of sub-pix [R, G, B] is made as display brightness the 2nd setting (y this moment
2) the light-source brightness Y of light source cell
2Processing.
That is, in embodiment 1, even the darkest light source cell in this state, light-source brightness also is y
L'.(C) of Fig. 1 schematically shows the state of the light-source brightness (light-source brightness 2) in this state, and (D) of Fig. 1 shows the state of display brightness.
In addition, as previously mentioned, the light transmission rate of liquid crystal cell generally can not be entirely " 0 ".Therefore, be minimum even establish the light transmission rate (numerical aperture) of each sub-pix, the light that also can produce from the liquid crystal cell leaks.Its result in unit, high brightness luminescent viewing area, and is maximum input signal in the unit, viewing area to the suitable input signal of the control signal of a certain pixel, and has bigger value x
H, on the other hand, though the hypothesis will with lower value x
LThe suitable control signal of input signal offer other pixel that constitutes this unit, high brightness luminescent viewing area, and imagination also will with lower value x
LThe suitable control signal of input signal offer the whole pixels (with reference to Fig. 1 (A)) that constitute unit, low-light level luminous display area territory, also can as (D) schematically illustrated display brightness of Fig. 1, make the display brightness yy in other pixel that constitutes unit, high brightness luminescent viewing area
L' with the pixel that constitutes unit, low-light level luminous display area territory in display brightness y
L' between (C) of diversity ratio Figure 11 of producing illustrate littler.Therefore, do not have and observe the situation of appearing the black display part in one's mind, and can access same lower display brightness state, can realize the raising of image displaying quality.
On the other hand, exist in unit, low-light level luminous display area territory to be masked as " 0 " or unit, high brightness luminescent viewing area and to exist and be masked as under the situation of " 0 ", at whole light source cells 42
(q, p)In for example carry out following processing.That is, supposing will (value be for x with maximum input signal in the unit, viewing area
U-max (q, p)) suitable control signal [R, G, B]
(q, p)Offer sub-pix [R, G, B]
(q, p), and hypothesis sub-pix [R, G, B] at this moment
(q, p)Light transmission rate (numerical aperture) be corrected as light transmission rate the 1st setting Lt
1, obtain to be used for sub-pix [R, G, B] this moment
(q, p)Brightness be made as display brightness the 2nd setting (y
2-(q, p)) light source cell 42
(q, p)Light-source brightness Y
2-(q, p)Processing.
In the processing in [step-120] of above explanation, more particularly, per 1 image display frame, per 1 light source cell are controlled light-source brightness Y respectively
2', Y
2Get final product to satisfy following formula (1).That is, according to as light-source brightness control function g (x
Nol-max) formula (2) control the brightness of light source 41, and control light-source brightness Y
2', Y
2Get final product to satisfy formula (1).The concept map of this control is as (A) of Fig. 8 with (B).But as described later, need be to light-source brightness Y
2', Y
2Enforcement is based on the correction of the influence of other light source cell 42.In addition, can obtain in advance and light-source brightness Y
2', Y
2The relevant following relation of control and be stored in the memory storage 72 the i.e. value x of maximum input signal in the unit, viewing area
U-max, x '
U-max, with have and this maximal value x
U-max, x '
U-maxThe value of the control signal that the input signal that equates is suitable, display brightness the 2nd setting y when supposing to provide pixel (sub-pix) with this control signal
2, this moment each sub-pix light transmission rate (numerical aperture) [light transmission rate the 2nd setting Lt
2], the light transmission rate (numerical aperture) of establishing each sub-pix is light transmission rate the 1st setting Lt
1The time to try to achieve display brightness the 2nd setting y
2', y
2Light source cell in the relation of brilliance control parameter.
y
2·Lt
1＝y
1·Lt
2 (1)
g(x
nol-max)＝a
1(x
nol-max)
2.2+a
0 (2)
Be made as driving pixel (or constitute pixel each sub-pix [R, G, B]) herein, and the mxm. that is input to the input signal (input signal [R, G, B]) of liquid crystal indicator driving circuit 90 is x
In-maxThe time, have:
x
nol-max≡x
U-max/x
In-max
a
1, a
0Be constant, and can with
a
1+a
0＝1
0＜a
0＜1,0＜a
1＜1 represents.For example can establish
a
1＝0.99
a
0＝0.01
In addition, input signal [R, G, B] respectively is worth x
R, x
G, x
BGet 2
8The value of level, so x
In-maxValue be the value suitable with " 255 ".
In addition, for backlight, for example (p under the situation of the brilliance control of light source cell 42 (1,1) q)=(1,1), needs the influence of consideration from other P * Q light source cell 42 in imagination.Light source cell 42 can be distinguished by the luminous profile of each light source cell 42 in advance from this influence that other light source cell 42 is subjected to, and therefore can come calculated difference by inverse operation, consequently can proofread and correct.The citation form of computing below is described.
Based on the necessary condition of formula (1) and formula (2), P * Q light source cell 42 needed brightness (light-source brightness Y
2', Y
2) with matrix [L
P * Q] represent.In addition, P * Q light source cell 42 obtained in advance only driven a certain light source cell and the brightness of resulting a certain light source cell when not driving other light source cell.This brightness with matrix [L '
P * Q] represent.And then, with matrix [α
P * Q] represent correction coefficient.So the relation of these matrixes can be represented with following formula (3-1).Matrix [the α of correction coefficient
P * Q] can obtain in advance.
[L
P×Q]＝[L′
P×Q]·[α
P×Q] (3-1)
In view of the above, can from formula (3-1) obtain matrix [L '
P * Q].Matrix [L '
P * Q] can obtain according to the computing of inverse matrix.That is, can calculate
[L′
P×Q]＝[L
P×Q]·[α
P×Q]
-1 (3-2)
Then, can control light source 41
(q, p)With obtain with matrix [L '
P * Q] expression brightness.Specifically, this operational processes can use the information (tables of data) that is stored in the memory storage (storer) 82 to carry out.In addition, for light source 41
(q, p)Control because matrix [L '
P * Q] value do not get negative value, so operation result must be limited to positive region.Thereby formula (3-2) separate and non-tight separate, also become approximate solution sometimes.
Like this, obtain matrix [L according to the formula (1) of gained and the value of formula (2) in the computing circuit 71 that constitutes backlight lamp control circuit 70
P * Q], according to the matrix [α of correction coefficient
P * Q] when obtaining supposition independent driving light source unit as mentioned above brightness matrix [L '
P * Q], and then be transformed to the integer of the correspondence in 0 to 255 scope according to being stored in map table in the memory storage 72.Like this, in the computing circuit 71 that constitutes backlight lamp control circuit 70, can access light source cell 42
(q, p)In be used to control red light emitting diodes 41
R (q, p)The value S of pulse-width modulated output signal of fluorescent lifetime
R-(q, p), be used to control green LED 41
G (q, p)The value S of pulse-width modulated output signal of fluorescent lifetime
G-(q, p), be used to control blue LED 41B (q, the value S of the pulse-width modulated output signal of fluorescent lifetime p)
B-(q, P)
[step-130]
Then, the value S of resulting pulse-width modulated output signal in the computing circuit 71 that constitutes backlight lamp control circuit 70
R-(q, p), S
G-(q, p), S
B-(q, p)Be sent to and light source cell 42
(q, p)Corresponding and the light source cell driving circuit 80 that is provided with
(q, p) Memory storage 82 and be stored in the memory storage 82.In addition, clock signal clk also is sent to light source cell driving circuit 80 (q, p) (with reference to Fig. 5).
Then, computing circuit 81 is based on the value S of pulse-width modulated output signal
R-(q, p), S
G-(q, P), S
B-(q, p)Decide and constitute light source cell 42
(q, p)Red light emitting diodes 41
R (q, p)ON time t
R-ONAnd closing time t
R-OFF, green LED 41
G (q, p)ON time t
G-ONAnd closing time t
G-OFF, blue LED 41
B (q, p)ON time t
B-ONAnd closing time t
B-OFFIn addition, t
R-ON+ t
R-OFF=t
G-ON+ t
G-OFF=t
B-ON+ t
B-OFF=fixed value t
ConstIn addition, can be based on the dutycycle in the driving of light emitting diode width modulation with t
ON/ (t
ON+ t
OFF)=t
ON/ t
ConstRepresent.
Then, will with constitute light source cell 42
(q, p)Red light emitting diodes 41
R (q, p), green LED 41
G (q, p), blue LED 41
B (q, p)ON time t
R-ON (q, p), t
G-ON-(q, p), t
B-ON-(q, p)Suitable signal sends to led drive circuit 83, by this led drive circuit 83, according to ON time t
R-ON-(q, p), t
G-ON-(q, p), t
B-ON-(q, p)The value of suitable signal, on-off element 85R
(q, p), 85G
(q, p), 85B
(q, p)With ON time t
R-ON-(q, p), t
G-ON-(q, p), t
B-ON-(q, p)Become conducting state, make LED drive current flow to each light emitting diode 41 from light emitting diode driving power 86
R (q, p), 41
G (q, p), 41
B (q, p)Its result, in 1 image display frame, each light emitting diode 41
R (q, p), 41
G (q, p), 41
B (q, p)With ON time t
R-ON-(q, p), t
G-ON-(q, P), t
B-ON-(q, p)Carry out luminous.Like this, (p, q) unit, individual viewing area 12 to the with the illumination of regulation
(q, p)Throw light on.
Represent the state that obtains like this with solid line at (A) of Fig. 9 and (B), wherein Fig. 9 (A) has been schematically illustrated as to drive sub-pix and the value of the input signal that is input into liquid crystal indicator driving circuit 90 is asked value (the ≡ x behind the power 2.2 times
2.2) and dutycycle (=t
ON/ t
Const) the figure of relation, Fig. 9 (B) is the figure that schematically shows the relation of the value X of control signal of the light transmission rate Lt that is used to control sub-pix and display brightness y.
[step-140]
On the other hand, the input signal [R, G, B] of liquid crystal indicator driving circuit 90 will be input to
(q, p)Value x
R-(q, p), x
G-(q, p), x
B-(q, p)Deliver to timing controller 91, for timing controller 91, will with the input signal of being imported [R, G, B]
(q, p)Suitable control signal [R, G, B]
(q, p)Offer (exporting to) sub-pix [R, G, B]
(q, p)In the timing controller 91 of liquid crystal indicator driving circuit 90, generate and offer sub-pix [R, G, B] from liquid crystal indicator driving circuit 90
(q, p)Control signal [R, G, B]
(q, p)Value X
R-(q, p), X
G-(q, p), X
B-(q, p)With input signal [R, G, B]
(q, p)Value x
R-(q, p), x
G-(q, p), x
B-(q, p)The relation that following formula (4-1), formula (4-2), formula (4-3) are arranged.B wherein
1_R, b
0_R, b
1_G, b
0_G, b
1_B, b
0_BIt is constant.In addition, each image display frame is made light source cell 42 respectively
(q, p)Light-source brightness Y
2-(q, p)Change, so control signal [R, G, B]
(q, p)Substantially have input signal [R, G, B]
(q, p)2.2 powers of value carried out based on light-source brightness Y
2-(q, p)The value of correction (compensation) of variation.That is, in an embodiment, light-source brightness Y
2-(q, p)Therefore change with per 1 image display frame, at light-source brightness Y
2-(q, P)(≤Y
1) in obtain display brightness the 2nd setting y
2-(q, p)And decision control signal [R, G, B]
(q, p)Value x
R-(q, p), x
G-(q, p), x
B-(q, p)And proofread and correct (compensation), control light transmission rate (numerical aperture) Lt of sub-pix.Here, the function f of formula (4-1), formula (4-2), formula (4-3)
R, f
G, f
BIt is the function of obtaining in advance that is used to carry out this correction (compensation).
X
R-(q，p)＝f
R(b
1_R·x
R-(q，p) 2.2+b
0_R) (4-1)
X
G-(q，p)＝f
G(b
1_G·x
G-(q，p) 2.2+b
0_G) (4-2)
X
B-(q，p)＝f
B(b
1_B·x
B-(q，p) 2.2+b
0_B) (4-3)
Like this, the image display action in 1 image display frame has just been finished.
[embodiment 2]
Below, the driving method of display device among the embodiment 2 is described referring again to Fig. 1 and Fig. 3.
[step-200]
At first carry out [step-100] identical step with embodiment 1.
[step-210]
Then, carry out [step-110] the identical step with embodiment 1, with unit, whole viewing area 12
(q, p)In the unit, viewing area in the value x of maximum input signal
U-max (q, p)Be stored in the memory storage 72.
Simultaneously, in computing circuit 71, obtain the value x of maximum input signal in the unit, viewing area
U-max (q, p)Be the 1st setting PD
1Following unit, low-light level luminous display area territory is with respect to unit, whole viewing area (P * Q 's) ratio R T
1Then, at the ratio R T of unit, low-light level luminous display area territory
1Value RT more than or equal to regulation
0Situation under, (p q) is stored in the memory storage 72, and exists sign to change to " 1 " from the initial value " 0 " that has resetted unit, low-light level luminous display area territory with the position of unit, low-light level luminous display area territory.And then in computing circuit 71, whether investigation exists the value x of maximum input signal in the unit, viewing area around unit, low-light level luminous display area territory
U-max (q, p)With the 2nd setting PD
2Identical or greater than the unit, high brightness luminescent viewing area of the 2nd setting, under the situation that has such unit, high brightness luminescent viewing area, with its position (p, q) be stored in the memory storage 72, and exist sign to change to " 1 " unit, high brightness luminescent viewing area from the initial value " 0 " that has resetted.
In addition, in embodiment 2, unit, high brightness luminescent viewing area on a certain direction of eight directions of unit, low-light level luminous display area territory with the situation of unit, low-light level luminous display area territory adjacent (adjacency) under, think around unit, low-light level luminous display area territory, to have unit, high brightness luminescent viewing area.Exist in unit, low-light level luminous display area territory and to be masked as " 1 " and unit, high brightness luminescent viewing area exists under the situation that is masked as " 1 ", the state of state, the light-source brightness (light-source brightness 1) in this state that is used for input signal that the pixel light transmission rate (numerical aperture) that constitutes the unit, viewing area is controlled is with (A) of Fig. 1 with identical (B).
[step-220]
Secondly, exist in unit, low-light level luminous display area territory and to be masked as " 1 " and unit, high brightness luminescent viewing area and to exist and be masked as under the situation of " 1 ", make the processing of the brightness increase of the light source cell corresponding, need only [step-120] identical step of carrying out with embodiment 1 with unit, low-light level luminous display area territory.The state of the light-source brightness in the state that obtains like this (light-source brightness 2) and the state of display brightness are shown identical with Fig. 1 (C) and Fig. 1 (D).
On the other hand, have the situation be masked as " 0 " in unit, low-light level luminous display area territory, or unit, high brightness luminescent viewing area exists and is masked as under the situation of " 0 ", as long as carry out [step-120] the identical step with embodiment 1.
[step-230]
And then by carrying out [step-130], [step-140] the identical step with embodiment 1, the image display action in 1 image display frame has just been finished.
[embodiment 3]
Embodiment 3 relate to as the 3rd mode of embodiments of the present invention one example relevant display device and driving method thereof.In embodiment 3, in backlight lamp control circuit 70 that is equivalent to control part and light source cell driving circuit 80, the ratio (RT in unit, low-light level luminous display area territory
1) more than or equal to the value (RT that stipulates
0) and under the situation that has the high brightness luminescent viewing area unit adjacent with a plurality of (in embodiment 3, establishing R=2) continuous unit, low-light level luminous display area territory, more be the light source cell corresponding with near unit, low-light level luminous display area territory, unit, distance high brightness luminescent viewing area, more be the processing that its brightness is increased.
Below, the driving method of display device among the embodiment 3 is described with reference to Fig. 2 and Fig. 3.
[step-300]
At first carry out [step-100] identical step with embodiment 1.
[step-310]
Then, carry out [step-110] the identical step with embodiment 1, with unit, whole viewing area 12
(q, p)In the unit, viewing area in the value x of maximum input signal
U-max (q, p)Be stored in memory storage 72.
Simultaneously, in computing circuit 71, obtain the value x of maximum input signal in the unit, viewing area
U-max (q, p)Be the 1st setting PD
1Following unit, low-light level luminous display area territory is with respect to unit, whole viewing area (P * Q 's) ratio R T
1Then, at the ratio R T of unit, low-light level luminous display area territory
1Value RT more than or equal to regulation
0Situation under, (p q) is stored in the memory storage 72, and exists sign to change to " 1 " from the initial value " 0 " that has resetted unit, low-light level luminous display area territory with the position of unit, low-light level luminous display area territory.And then, in computing circuit 71, the value x of maximum input signal in the investigation unit, viewing area
U-max (q, p)With the 2nd setting PD
2Identical or greater than the unit, high brightness luminescent viewing area of the 2nd setting whether with a plurality of continuous adjacent existence in unit, low-light level luminous display area territory, under the situation that has such unit, high brightness luminescent viewing area, with its position (p, q) be stored in the memory storage 72, and exist sign to change to " 1 " unit, high brightness luminescent viewing area from the initial value " 0 " that has resetted.
In addition, in embodiment 3, unit, high brightness luminescent viewing area on a certain direction of eight directions of unit, low-light level luminous display area territory with the situation of the end adjacent (adjacency) of continuous unit, low-light level luminous display area territory under, think unit, high brightness luminescent viewing area and the adjacent existence in unit, low-light level luminous display area territory.(A) of Fig. 2 and (B) show to exist and be masked as " 1 " and unit, high brightness luminescent viewing area exists under the situation that is masked as " 1 ", is used for the state of input signal that the pixel light transmission rate (numerical aperture) that constitutes the unit, viewing area is controlled, the state of the light-source brightness (light-source brightness 1) in this state in unit, low-light level luminous display area territory.
[step-320]
Then, exist in unit, low-light level luminous display area territory and to be masked as " 1 " and unit, high brightness luminescent viewing area and to exist and be masked as under the situation of " 1 ", make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory, specifically, carry out following processing.Promptly, in embodiment 3, if R=2, therefore be in 2 continuous unit, low-light level luminous display area territory [the 1st unit, low-light level luminous display area territory and unit, the 2nd low-light level luminous display area territory] of benchmark in position with unit, high brightness luminescent viewing area, for with r (r=1 wherein, the light source cell of unit, 2) low-light level luminous display area territory correspondence, imagination will with maximum input signal in the unit, viewing area (value is for x "
U-max(r)) suitable control signal [R, G, B] is supplied with sub-pix [R, G, B], and the light transmission rate (numerical aperture) of hypothesis sub-pix this moment [R, G, B] is corrected as light transmission rate the 1st setting Lt
1, obtain to be used for the brightness of sub-pix [R, G, B] is made as display brightness the 2nd setting (y this moment
2) the light-source brightness Y of light source cell
2(r) " processing.Here, maximum input signal x in the unit, viewing area "
U-max(r) satisfy:
X "
U-max(r)=B
1 rX
MAX(0＜B wherein
1＜1)
Or x "
U-max(r)=(1-B
2R) x
MAX(0＜B wherein
2＜1)
Get final product.(C) of Fig. 2 schematically shows the state of the light-source brightness (light-source brightness 2) in this state, and (D) of Fig. 2 shows the state of display brightness, with Y
L(r) " represent with unit, viewing area in the value x of maximum input signal "
U-max(r) light-source brightness of Dui Ying light source cell is with y
L(r) " represent display brightness.In addition, with yy
L" represent to constitute the display brightness in other pixel of unit, high brightness luminescent viewing area.
On the other hand, have the situation be masked as " 0 " in unit, low-light level luminous display area territory, or unit, high brightness luminescent viewing area exists and is masked as under the situation of " 0 ", also as long as carry out [step-120] identical step with embodiment 1.
[step-330]
And then by carrying out [step-130], [step-140] the identical step with embodiment 1, the image display action in 1 image display frame has just been finished.
More than describe the present invention based on preferred embodiment, but the present invention is not limited to these embodiment.The structure of Shuo Ming infiltration type color liquid crystal display arrangement, backlight, light source cell, display device, control part, structure can be the examples of enumerating in an embodiment, and the parts, material etc. that constitute them also are examples, can suitably change.Temperature that can be by monitoring light emitting diode with temperature sensor also feeds back to light source cell driving circuit 80 with its result, carries out luminance compensation (correction), the temperature control of light source cell 42.In an embodiment, imagination is divided into P * Q unit, imaginary viewing area with the viewing area of liquid crystal indicator and is illustrated, but according to circumstances, the liquid crystal indicator of infiltration type also can have the structure that is divided into P * Q actual unit, viewing area.
In addition, in the present embodiment, such situation has been described, promptly in the unit, viewing area the value of maximum input signal be below the 1st setting unit, low-light level luminous display area territory around to have the value of maximum input signal in the unit, viewing area be unit, high brightness luminescent viewing area as the 2nd setting of the value more than the 1st setting, at this moment, make the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory; But except value according to maximum input signal in the unit, viewing area, also can be according to the average brightness level of the input signal in the unit, viewing area, the brightness that Luminance Distribution (histogram) information is controlled the light source cell corresponding with unit, low-light level luminous display area territory.For example, can consider to detect and find out that easily inhomogeneous part of waiting of high-brghtness picture images appear black display image partly in one's mind, and control the brightness of light source cell according to Luminance Distribution (histogram) information of the input signal in the unit, viewing area.In addition, also can constitute the brightness of controlling light source cell according to the value and the average brightness level of the maximum input signal in the unit, viewing area.
Claims (15)
1. display device possesses:
Display part is by the liquid crystal indicator of the infiltration type with viewing area that the pixel that is rectangular arrangement constitutes and constitute;
Backlight is by light source cell independent configuration constitutes with the unit, a plurality of viewing area that constitutes the viewing area is corresponding, to throwing light at the back side of display part; And
Drive division drives display part and backlight according to the input signal from the outside,
This display device is characterised in that,
Drive division has control part, and this control part is controlled the luminance of the light source cell corresponding with this unit, viewing area according to as maximum input signal in the unit, peaked viewing area in the input signal corresponding with each unit, viewing area,
Described control part investigation value of maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have a maximum input signal in the unit, viewing area value with identical greater than the 2nd setting of described the 1st setting or greater than the unit, high brightness luminescent viewing area of the 2nd setting
Around unit, described low-light level luminous display area territory, there is under the situation of unit, described high brightness luminescent viewing area the processing that described control part increases the brightness of the light source cell corresponding with unit, described low-light level luminous display area territory.
2. display device according to claim 1 is characterized in that,
Under the situation of unit, described high brightness luminescent viewing area and the described adjacent existence in unit, low-light level luminous display area territory, described control part increases the processing of the brightness of the light source cell corresponding with unit, described low-light level luminous display area territory.
3. display device according to claim 1 is characterized in that,
Described the 1st setting is 25% a value smaller or equal to the input signal mxm..
4. display device according to claim 1 is characterized in that,
Whether described control part investigation exists unit, described low-light level luminous display area territory, and whether investigation exists unit, described high brightness luminescent viewing area around unit, described low-light level luminous display area territory.
5. display device according to claim 1 is characterized in that,
Described the 2nd setting is 25% a value greater than the mxm. in the maximum input signal value in the unit, viewing area.
6. display device according to claim 1 is characterized in that,
Described control part is obtained the ratio of unit, described low-light level luminous display area territory with respect to unit, whole viewing area,
Ratio in unit, low-light level luminous display area territory exists under the situation of unit, high brightness luminescent viewing area more than or equal to setting and around unit, low-light level luminous display area territory, the processing that described control part increases the brightness of the light source cell corresponding with unit, low-light level luminous display area territory.
7. display device according to claim 6 is characterized in that,
Described the 1st setting is 25% a value smaller or equal to the input signal mxm..
8. display device according to claim 6 is characterized in that,
Described the 2nd setting is 25% a value greater than the mxm. in the maximum input signal value in the unit, viewing area.
9. display device according to claim 1 is characterized in that,
Described control part investigate unit, described high brightness luminescent viewing area whether with a plurality of continuous adjacent existence in unit, described low-light level luminous display area territory,
Under the situation that has the high brightness luminescent viewing area unit adjacent with a plurality of continuous unit, low-light level luminous display area territory, described control part carries out following processing: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.
10. display device according to claim 9 is characterized in that,
Described control part is obtained the ratio of unit, described low-light level luminous display area territory with respect to unit, whole viewing area,
Under the situation of the ratio of unit, the low-light level luminous display area territory high brightness luminescent viewing area unit adjacent with a plurality of continuous unit, low-light level luminous display area territory more than or equal to setting and existence, described control part carries out following processing: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.
11. display device according to claim 9 is characterized in that,
Described the 1st setting is 25% a value smaller or equal to the input signal mxm..
12. display device according to claim 9 is characterized in that,
Described the 2nd setting is 25% a value greater than the mxm. in the maximum input signal value in the unit, viewing area.
13. the driving method of a display device, this display device possesses:
Display part is by the liquid crystal indicator of the infiltration type with viewing area that the pixel that is rectangular arrangement constitutes and constitute;
Backlight is by light source cell independent configuration constitutes with the unit, a plurality of viewing area that constitutes the viewing area is corresponding, to throwing light at the back side of display part; And
Drive division drives display part and backlight according to the input signal from the outside,
This drive division has control part, and this control part is controlled luminance with the corresponding light source cell in this unit, viewing area according to maximum input signal in the unit, peaked viewing area that has in the input signal corresponding with each unit, viewing area,
The driving method of this display device is characterised in that,
In described control part, the value of investigation maximum input signal in the unit, viewing area be below the 1st setting unit, low-light level luminous display area territory around whether have a maximum input signal in the unit, viewing area value with identical greater than the 2nd setting of described the 1st setting or greater than the unit, high brightness luminescent viewing area of the 2nd setting
Around unit, described low-light level luminous display area territory, there is under the cell cases of described high brightness luminescent viewing area the processing that described control part increases the brightness of the light source cell corresponding with unit, described low-light level luminous display area territory.
14. the driving method of display device according to claim 13 is characterized in that,
In described control part, obtain the ratio of unit, described low-light level luminous display area territory with respect to unit, whole viewing area, and investigate unit, described low-light level luminous display area territory around whether have a unit, described high brightness luminescent viewing area,
Described ratio in unit, described low-light level luminous display area territory exists under the situation of unit, described high brightness luminescent viewing area more than or equal to setting and around unit, described low-light level luminous display area territory, makes the processing of the brightness increase of the light source cell corresponding with unit, low-light level luminous display area territory in described control part.
15. the driving method of display device according to claim 13 is characterized in that,
In described control part, investigate unit, described high brightness luminescent viewing area whether with a plurality of continuous adjacent existence in unit, described low-light level luminous display area territory,
Under the situation that has the high brightness luminescent viewing area unit adjacent with a plurality of continuous unit, low-light level luminous display area territory, in described control part, carry out following processing: increase the brightness of the light source cell corresponding with these unit, low-light level luminous display area territory, and unit, low-light level luminous display area territory increases the brightness of the light source cell corresponding with this unit, low-light level luminous display area territory more more near unit, high brightness luminescent viewing area.
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| JP2009139930A (en) * | 2007-11-13 | 2009-06-25 | Mitsumi Electric Co Ltd | Backlight device and liquid crystal display device using the same |
| US20090179849A1 (en) * | 2008-01-15 | 2009-07-16 | Hua Wu | Image displaying method, device, and related liquid crystal display panel |
| JP2009204825A (en) * | 2008-02-27 | 2009-09-10 | Hitachi Displays Ltd | Display |
| KR101511130B1 (en) * | 2008-07-25 | 2015-04-13 | 삼성디스플레이 주식회사 | Method for boosting a display image, controller unit for performing the method, and display apparatus having the controller unit |
| KR100958324B1 (en) * | 2008-07-30 | 2010-05-17 | 한양대학교 산학협력단 | Image data Processing Apparatus having function of adjusting luminance of backlight according to input image data, Liquid Crystal Display, and Method of driving the same |
| KR101612455B1 (en) | 2009-04-16 | 2016-04-15 | 삼성디스플레이 주식회사 | Method of correcting pixel data, and display apparatus for performing the method |
| CN110459068A (en) * | 2012-10-12 | 2019-11-15 | 通用电气照明解决方案有限责任公司 | LED traffic light control system |
| CN104728671A (en) * | 2015-02-09 | 2015-06-24 | 中南民族大学 | LED lattice backlight device and backlight producing method thereof |
| CN104809347B (en) * | 2015-04-28 | 2018-08-24 | 南京巨鲨显示科技有限公司 | A kind of implementation method that control display outburst area is shown |
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| US7394448B2 (en) | 2003-06-20 | 2008-07-01 | Lg. Display Co., Ltd | Method and apparatus for driving liquid crystal display device |
| JP4628770B2 (en) | 2004-02-09 | 2011-02-09 | 株式会社日立製作所 | Image display device having illumination device and image display method |
| US7602369B2 (en) | 2004-05-04 | 2009-10-13 | Sharp Laboratories Of America, Inc. | Liquid crystal display with colored backlight |
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