CN105676516A

CN105676516A - Display device and method of driving the same

Info

Publication number: CN105676516A
Application number: CN201510888460.7A
Authority: CN
Inventors: 境川亮; 浅川阳; 浅川阳一; 冈真郎; �冈真一郎
Original assignee: Japan Display Central Inc
Current assignee: Japan Display Central Inc; Japan Display Inc
Priority date: 2014-12-08
Filing date: 2015-12-07
Publication date: 2016-06-15
Anticipated expiration: 2035-12-07
Also published as: TW201621423A; CN105676516B; JP2016110098A; KR20160069469A; TWI599824B

Abstract

The invention provides a display device and method of driving the same. According to one embodiment, the power consumption can be reduced as a whole without a large decrease in the efficiency of transmittance. According to one embodiment, a display device includes subpixels arranged in a first direction and a second direction Y intersecting the first direction, color filters corresponding to the subpixels, respectively, and a light device. The color filters include at least blue filters and yellow filters adjacent to each other. A frame period of the light device includes at least a period of outputting cyan light and a period of outputting magenta light.

Description

The driving method of display unit, display unit

The cross reference of related application

The application based on and the benefit of priority of existing Japanese patent application of No.2015-222143 that requires the No.2014-247904 submitted on December 8th, 2014 and submit on November 12nd, 2015, its whole content is hereby expressly incorporated by reference.

Technical field

Present embodiment relates to the driving method of display unit, display unit.

Background technology

In recent years, portable terminal device is constantly popularized. Portable terminal device comprises smart mobile phone, personal digital assistant device (PDA) or panel computer etc., and its display performance is also at continuous high performance. These portable terminal devices can color display.

As the technology of color display, there is field sequential color (FSC) mode. In the prior art, FSC mode uses the light-emitting device of the light-emitting device of redness (R), the light-emitting device of green (G) and blueness (B) as means of illumination. FSC mode is divided into three periods (can also be called three fields (field)) using during a frame as between the light emission period of the light-emitting device of red (R), between the light emission period of the light-emitting device of green (G) and between the light emission period of the light-emitting device of blue (B). And, the pixel of drive and that in order to red display select pixel corresponding with the field of each three (R, G, B) (selected R pixel), selecting in order to indigo plant display (selected B pixel), the pixel selected in order to green display (selected G pixel). In addition, as light-emitting device, it is possible to use pointolite. More specifically, as this pointolite, it is possible to use photodiode (LED).

The above-mentioned R pixel selected, the B pixel selected, the G pixel selected select the pixel corresponding to R, G, B signal from numerous pixels of two-dimensional arrangements on display panels. Although each liquid-crystal display image being made up of selected R pixel, selected B pixel, selected G pixel is shown during independent, but the after image effect due to eyes, and coloured image is by people's visual confirmation. Above-mentioned FSC mode owing to not needing colour filter on display panels, the thus utilization ratio height of light.

Summary of the invention

The display unit of an aspect of the present invention has: multiple sub-pixel, along first party to and with described first party to intersect second direction arrangement; Colour filter is corresponding with each sub-pixel; And means of illumination, described colour filter at least comprises adjacent blue color filter and yellow filter, and described means of illumination has light source, during the light output at least having a cyan during a frame of the light exported from light source and during the light output of magenta.

The driving method of the display unit of the another aspect of the present invention, wherein, described display unit has: along first party to and with described first party to multiple sub-pixel colour filter corresponding with each sub-pixel of the second direction arrangement intersected and means of illumination, described colour filter at least comprises adjacent blue color filter and yellow filter, described means of illumination during a frame at least export the light of cyan and the light of magenta.

Accompanying drawing explanation

Fig. 1 is the three-dimensional exploded view of the structure example of the liquid crystal indicator LCD schematically illustrating in present embodiment.

Fig. 2 is the figure of structure and the equivalent electrical circuit schematically illustrating display panels PNL.

Fig. 3 A is the figure of the example of the configuration of the colour filter illustrating sub-pixel and the color of means of illumination.

Fig. 3 B be the frame relative to means of illumination is shown during in cyan field and pinkish red colour field and the figure of the relation of illuminant colour that exports from colour filter.

Fig. 3 C is the figure of the example of the intensity illustrating the illuminant colour exported relative to the cyan field of means of illumination and pinkish red colour field from colour filter.

Fig. 4 A is the figure of other example of the configuration of the colour filter illustrating sub-pixel and the color of means of illumination.

Fig. 4 B be the frame relative to means of illumination is shown during in cyan field, white field and pinkish red colour field and the figure of the relation of illuminant colour that exports from colour filter.

Fig. 4 C is the figure of the example of the intensity of the illuminant colour illustrating cyan field relative to means of illumination, white field and pinkish red colour field and exporting from colour filter.

Fig. 5 is the figure of the luminous energy illustrating the transmitance of blue color filter and yellow filter and blueness (B) LED, green (G) fluor, redness (R) fluor.

Fig. 6 is the figure that the opening rate of the sub-pixel with yellow filter in an enforcement mode and the sub-pixel with blue color filter and transmitance are compared with opening rate and the transmitance of the sub-pixel not having spectral filter and illustrated.

Fig. 7 A is each brightness of the LED of LED and B of LED, G of illustrating R and the relation of electric current and when taking advantage of of brightness and electric current being calculated fluor LED (the emitting led element being coated with fluor of dialogue (W)) brightness result is defined as 100 and calculate result with taking advantage of of electric current and calculation result will be taken advantage of as LED effect further to carry out the figure defined and illustrate.

Fig. 7 B is by the opening rate in the opening rate of the enforcement mode of the application, transmitance, LED effect and existing field-sequential mode, transmitance, LED effectiveness comparison and the figure that illustrates.

Fig. 8 A is the explanation figure illustrating and showing the distance of color change on a chromaticity diagram look changes on the region comprising primary colors R, G, B.

Fig. 8 B illustrates display look explanation figure of the distance of color change on a chromaticity diagram when change on the region of cyan and magenta.

Fig. 9 A illustrates other enforcement mode and also has the time figure of the action of the situation of the illuminated field of white (W) at means of illumination except the illuminated field of cyan, the illuminated field of magenta.

Fig. 9 B illustrates and an other enforcement mode and also have the illuminated field of white (W) except the illuminated field of cyan, the illuminated field of magenta and spectral filter also has the time figure of action of situation of yellow, blueness, white (W) spectral filter at means of illumination.

Figure 10 A is the figure of the enforcement mode illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B).

Figure 10 B is the figure of the example illustrating the image element circuit corresponding with the spectral filter of Figure 10 A.

Figure 11 A is the figure of the other enforcement mode illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B).

Figure 11 B is the figure of the example illustrating the image element circuit corresponding with the spectral filter of Figure 11 A.

Figure 11 C is the figure of the other example illustrating the image element circuit corresponding with the spectral filter of Figure 11 A.

Figure 12 A is the figure of the other enforcement mode illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B).

Figure 12 B is the figure of the example illustrating the image element circuit corresponding with the spectral filter of Figure 12 A.

Figure 12 C is the figure of the other example illustrating the image element circuit corresponding with the spectral filter of Figure 12 A.

Figure 13 is the figure of the example of the graphic representation of the spectrophotometric transmittance illustrating yellow filter and blue color filter.

Figure 14 is the figure of the calculated example of the area ratio illustrating yellow filter and blue color filter.

Figure 15 is the figure of the characteristic example illustrating the spectral brightness when magenta LED and the cyan LED luminescence simultaneously making means of illumination.

Figure 16 be utilize in fig. 13 shown in two spectral filters spectral transmittance, in fig. 14 shown in two spectral filters area ratio and in fig .15 shown in spectral brightness and figure that the relation curve graphing of blue color filter and the transmitance ratio of yellow filter and the means of illumination luminance factor of magenta and cyan is illustrated.

Embodiment

Hereinafter, with reference to accompanying drawing, various enforcement mode is described.

First, the introducing of the enforcement mode hereafter illustrated is described. FSC mode owing to not needing colour filter on display panels, the thus utilization ratio height of light. But, the luminous efficiency of the LED of green (G) is about the 1/3 of the luminous efficiency of the LED of blue (B). If making service voltage increase in order to the luminous efficiency of the LED that improves green (G), then just there is power consumption and become big such problem. In addition, when for the LED of red (R), there is the wavelength relevant to colourity be easy to pass through in time and change such character, in order to maintain white region on a chromaticity diagram, it is necessary to adjust the LED of green (G) and the colourity of the LED of blueness (B) according to the change of the colourity of the LED of red (R). But, this adjustment is with the difficulty in technology.

Further, also have be easy to produce look separation (CBU), deteriorate such problem with image quality. This look separation (CBU) refers to that the plate of the window by having striated is configured on the display surface of the display panels of R, G, B color such as showing striated by field sequence, when making this plate vibrate to the direction intersected with striped, observe, from the window side of plate, the phenomenon that picture, visually the striped of the color of little width remains as after image. By reason, it is preferable that display surface seems very white. Such as, showing white black streaking by field sequence, and when moving sight line fast, referring to that the end of white black streaking seems the phenomenon of general red (look づく).

Improving this kind of look separation (CBU), the field increasing white (W) to RGB these three (can be called three subfields) will be set as during a frame that improvement then can be seen in four fields on the whole. But, in order to four fields will be set as in frame, just 3 speeds in the field duration of the driving circuit of LED from frame period must be increased to 4 speeds. Therefore, increase for the power consumption that drives.

In embodiments, therefore, its object is to, it is provided that not making declines widely through efficiency can suppress the display unit of power consumption, the driving method of display unit on the whole.

Hereinafter, concrete enforcement mode is described.According to enforcement mode, display unit has: along first party to and multiple sub-pixel of arranging to the second direction intersected with first party colour filter corresponding with each sub-pixel and means of illumination. At least blue spectral filter of above-mentioned colour filter is adjacent with the spectral filter of yellow, the light source during above-mentioned means of illumination has in during a frame light output at least with cyan and during the light output of magenta.

In addition, an open only example, the content suitable change of the purport keeping invention can easily expected in those of ordinary skill in the art should be content contained in the scope of the present invention. In addition, in order to make explanation definitely, the width in each portion, thickness, shape etc. are schematically shown by accompanying drawing sometimes compared with the form of reality, but and the explanation of non-limiting the present invention. Further, in this specification sheets and Ge Tu, sometimes playing about the figure occurred and the integrant scheming same or similar function already described above is marking identical reference symbol, and omitting the detailed explanation of repetition.

Fig. 1 is the three-dimensional exploded view of the structure example of the liquid crystal indicator LCD schematically illustrating in present embodiment. Liquid crystal indicator LCD possesses: the display panels PNL of active array type, double sticky tape TP, optical sheet OS, frame FR, light guiding plate LG, light source unit LU, reflector plate RS, chase (ベゼ Le) BZ. Planar light source device LS is the means of illumination making light be incident to display panels PNL. Planar light source device LS is configured at least possess light guiding plate LG and light source unit LU.

Display panels PNL possesses: the flat second substrate SUB2 that flat first substrate SUB1 and first substrate SUB1 is oppositely disposed and the liquid crystal layer being held between first substrate SUB1 and second substrate SUB2. In addition, liquid crystal layer is extremely thin compared with the thickness of display panels PNL, and is positioned at the inner side of the sealing material that first substrate SUB1 and second substrate SUB2 is fitted, because omitted herein its diagram.

Display panels PNL comprises the display area DA of display image in the region that first substrate SUB1 is relative with second substrate SUB2. In the example in the figures, display area DA is formed oblong-shaped, also sometimes referred to as territory, effective display area. Display panels PNL is the permeation type liquid crystal display panel with the transmission display function by making the light from planar light source device LS optionally pass through to show image. Display panels PNL both can have the corresponding structure of the transverse electric field mode being roughly parallel to the horizontal electric field of substrate interarea as display format with mainly utilization, it is also possible to the structure having with mainly utilizing the vertical electric field patterns of the vertical electric field being approximately perpendicular to substrate interarea corresponding.

In the example in the figures, as supplying the signal supply source for the signal driving display panels PNL, first substrate SUB1 is provided with driving IC chip CP and flexible printed circuit substrate FPC.

Optical sheet OS has photopermeability, is positioned at the rear side of display panels PNL, at least relative with display area DA. As optical sheet OS, comprise diffusion sheet OSA, prismatic lens OSB, prismatic lens OSC, diffusion sheet OSD etc. In the example in the figures, these optical sheets OS is all formed oblong-shaped. In addition, the structures such as diffusion sheet included in optical sheet OS and the quantity of prismatic lens, stacking are examples, are not defined in the example shown in Fig. 1.

Frame FR is positioned between display panels PNL and chase (bezel). In the example in the figures, frame FR is formed rectangular box-like, has the opening portion OP of the oblong-shaped relative with display area DA. In addition, the shape of frame FR is an example, is not defined in the example shown in Fig. 1. In addition, when not needing frame FR, it is possible to do not arrange.

Double sticky tape TP in the outside of display area DA between display panels PNL and frame FR. This double sticky tape TP such as has opacifying property, is formed rectangular box-like. In addition, if display panels PNL and frame FR is without the need to using, double sticky tape TP can be fixed, then can not arrange double sticky tape TP.

Light guiding plate LG is between frame FR and chase BZ. Light guiding plate LG is formed dull and stereotyped shape, has the two interarea LGB of the first interarea LGA with the first interarea LGA opposition side and is connected the first interarea LGA and the side LGC of the 2nd interarea LGB.

Light source unit LU configures along the side LGC of light guiding plate LG. Light source unit LU possesses the multiple LEDs played a role separately, the flexible circuit board LFPC etc. being provided with multiple LED as light source. In the example in the figures, these LEDs form a line along the side LGC on short limit being parallel to light guiding plate LG. In addition, LED can also arrange along the other side (with the side that side LGC intersects) on the long limit being parallel to light guiding plate LG. That is, in FIG, LED arranges along first party to X, but can also arrange along with its second direction Y intersected. As described in detail in the back, LED is driven by field-sequential mode.

Reflector plate RS has light reflective, between chase BZ and light guiding plate LG. In the example in the figures, reflector plate RS is formed oblong-shaped.

Chase BZ accommodates above-mentioned display panels PNL, double sticky tape TP, optical sheet OS, frame FR, light guiding plate LG, light source unit LU, reflector plate RS. In the example in the figures, planar light source device LS is configured in namely relative with the first substrate SUB1 side of the rear side of display panels PNL, plays a role as means of illumination (in this case so-called backlight).

Fig. 2 is the figure schematically illustrating the structure of display panels PNL and an example of equivalent electrical circuit. Display unit has the display panels PNL of active matrix type. Display panels PNL possesses: the second substrate SUB2 that first substrate SUB1 and first substrate SUB1 is oppositely disposed and the liquid crystal layer LQ being held between first substrate SUB1 and second substrate SUB2. Display area DA is equivalent to maintain the region of liquid crystal layer LQ between first substrate SUB1 and second substrate SUB2, such as, be quadrilateral shape, comprises the multiple sub-pixels being configured to matrix shape. Like this, near the respective cross part that each arrangement of subpixels is intersected to the source wiring of the grid wiring of X with second direction Y in first party, and it is provided with each driving circuit optionally supplying sub-pixel signal to described multiple sub-pixel.

, in this manual, in addition a sub-pixel refers to that an image element circuit becomes the pixel of the structure being integrated with a colour filter. Therefore, the situation of a sub-pixel possesses a colour filter, and performance is monochromatic. The least unit of the colorful color performance that will gather multiple sub-pixel with different colour filters relative to sub-pixel and can carry out middle shade by primary colors is merely called pixel or composite pixel.As the combination of sub-pixel, as what also illustrate later, the combination of the sub-pixel of the combination with the sub-pixel of the colour filter possessing red, green, blue, the colour filter possessing Huang Helan, possess Huang, the combination etc. of the sub-pixel of the colour filter of Lan Hebai.

Multiple source wiring S (S1～Sm) that first substrate SUB1 possesses the multiple grid wiring G (G1～Gn) extended to X (can also be called row to or laterally) along first party on the DA of display area, extends along the second direction Y (can also be called arrange to or longitudinal) intersected to X with first party.

In addition, as on the right side of Fig. 2 by representative illustrate (region surrounded by long and short dash line), pixel electrode PE and the opposed facing common electrode CE1 of pixel electrode PE etc. that each sub-pixel possesses the switching element SW being electrically connected with grid wiring G and source wiring S, is electrically connected with switching element SW in each sub-pixel. Common electrode CE1 shows two, but is actually the electrode of integration. Memory capacitance CS is such as formed between common electrode CE1 and pixel electrode PE. Second substrate SUB2 is relative with first substrate SUB1 across liquid crystal layer LQ. In addition, memory capacitance CS both can be arranged as required, it is also possible to does not arrange. Such as, it is FFS (FringeFieldSwitching at liquid crystal indicator LCD, fringe field switching) pattern when, owing to pixel electrode PE and common electrode CE1 and the insulant that is configured between them play a role as memory capacitance CS, therefore can not separately establish memory capacitance CS.

Each grid wiring G (G1～Gn) is drawn to the outside of display area DA, and is connected with the first driving circuit GD. Each source wiring S (S1～Sm) draws to the outside of display area DA, and is connected with the 2nd driving circuit SD. Such as it is formed on first substrate SUB1 first driving circuit GD and the 2nd driving circuit SD at least partially, is connected with driving IC chip (being also sometimes referred to as liquid crystal driver or driving circuit control portion) CP.

2nd driving circuit SD in order to realize row inversion driving method, when to the source wiring output pixel signal of adjacent row, it is possible to export the pixel signal of dissimilar polarity. Driving IC chip CP is built-in with the controller of control the first driving circuit GD and the 2nd driving circuit SD, plays a role for driving the signal supply source of the signal of display panels PNL as supply. In the example in the figures, driving IC chip CP is installed on first substrate SUB1 in the outside of the display area DA of display panels PNL.

Common electrode CE1 extends on the whole region of display area DA, jointly is formed by multiple sub-pixel. Common electrode CE1 draws to the outside of display area DA, and is connected with power supply Vcom. Power supply Vcom is such as formed on first substrate SUB1 in the outside of display area DA, is electrically connected with common electrode CE1. Certain common electric voltage is supplied to power supply Vcom.

Colour filter is regularly arranged on multiple sub-pixel with what specify. Colour filter clips liquid crystal layer LQ and relative with pixel electrode, is formed on second substrate SUB2.

Above-mentioned multiple sub-pixel formation such as first arranges, the 2nd row, the 3rd arrange ..., the first row colour filter be blue (B), the 2nd colour filter arranged be yellow (Y), this kind of color constantly repeats to first party to X. Further, when comparing the width H2 of the width H1 of blue color filter and yellow filter, compared with blue color filter, the width of yellow filter is formed greatly.

Fig. 3 A shows the configuration of the colour filter of each sub-pixel and the example of the color of means of illumination. In figure 3 a, it is easy to clear to make the configuration of colour filter become, the incomplete structure of the source wiring S (S1～Sm) etc. of first substrate SUB1 side is illustrated.

In first party on X (transverse direction of figure), blue color filter (width H1) and yellow filter (width H2) repeated arrangement. Colour filter is formed on second substrate SUB2. In the display device, its planar light source device is driven also to be exactly means of illumination by field-sequential mode. At this, multiple LEDs of means of illumination comprise the photodiode that illuminant colour is cyan and magenta. The plurality of LED is installed on flexible circuit board LFPC.

The photodiode of cyan can by such as realizing to the fluor of the photodiode stacking green of blueness. The photodiode of magenta can by such as realizing to the fluor of the photodiode stacking redness of blueness. The photodiode of cyan is conducting during the 1/2 of the first half of a frame (lighting) such as, disconnects (extinguishing) during later half 1/2. The photodiode of one side's magenta disconnects (extinguishing) during the 1/2 of the first half of a frame, and conducting during later half 1/2 (is lighted), is driven in this way.

LED forms a line parallelly with the short limit of light guiding plate. It is incident to light guiding plate from the light of LED outgoing. Thus, pass through the pixel of state through light from the face luminescence (light that cyan and magenta periodically repeat) of light guiding plate outgoing. At this, owing to type of drive is field-sequential mode, the light that therefore face luminescence becomes cyan and magenta periodically repeats.

Fig. 3 B shows the relation of the cyan of the illuminant colour as means of illumination, the field of magenta and the color of the light from colour filter outgoing. Means of illumination has cyan field (1/2 frame) and pinkish red colour field (1/2 frame) during a frame. The color that can show on the display surface of display unit under cyan field (1/2 frame) is blue (B) and green (G). On the other hand, the color that can show on the display surface of display unit under pinkish red colour field (1/2 frame) is blue (B) and red (R).

As by known to Fig. 3 B, blue (B) though be cyan field, magenta colour field which all can show. In contrast, green (G) only can show after the match in cyan, and red (R) only can show after the match in magenta. Its result, the output level (luminous intensity) of blue (B) has the trend strengthened than green (G), red (R).

In order to solve this kind of imbalance, in this device, such as, as shown in Fig. 3 A and Fig. 3 C, manage to obtain the luminous intensity of the illuminant colour equilibrium of blue (B), green (G), red (R).

That is, the width H1 of blue color filter is made to reduce than the width H2 of yellow filter, so that the area making blue color filter becomes less than the area of yellow filter. Thus, as shown in Figure 3 C, luminous intensity, the luminous intensity of green (G) and the luminous intensity of red (R) managing to be able to make blueness (B) during a frame become almost equal.

In addition, in order to obtain white balance, the luminous intensity of the luminous intensity of blue (B), the luminous intensity of green (G) and redness (R) may not be equal. In order to the position of white obtained on chromaticity diagram, it is preferable that reset the luminous intensity of blueness (B), green (G), red (R) after the characteristic (transmitance etc.) considering each colour filter.

Although above-mentioned enforcement mode one frame comprises cyan field, pinkish red colour field two fields, but is not defined in this.

In Fig. 4 A, Fig. 4 B and Fig. 4 C, it is depicted as a frame and comprises cyan field, pinkish red colour field and white field three fields. As shown in Figure 4 A, therefore, the multiple LEDs forming means of illumination comprise the photodiode that illuminant colour is cyan, white and magenta.

In addition, shown in Fig. 3 A and Fig. 4 A, the light source unit LU with multiple LED be configured in the end face side of first party to X of light guiding plate. But, the allocation position of light source unit LU is not limited. Light source unit LU can also be configured at the end face of the second direction Y of light guiding plate. Light source unit LU shown in Fig. 4 A can provide cyan field, white field and pinkish red colour field. In Figure 4 A, although showing the photodiode of white, but light source unit LU may not have the photodiode of white. This is because, as Fig. 9 A, Fig. 9 B that illustrate below, white field can provide by lighting the photodiode of cyan and magenta simultaneously.

Fig. 4 B is divided into the sequential of cyan field, white field and pinkish red colour field during showing a frame. And, show the relation of the cyan of the illuminant colour as means of illumination, white and the field of the magenta color with the light from colour filter outgoing. Means of illumination has cyan field (1/3 frame), white field (1/3 frame) and pinkish red colour field (1/3 frame) during a frame. The color that can show on the display surface of display unit under cyan field (1/3 frame) is blue (B) and green (G). The color that can show on the display surface of display unit under white field (1/3 frame) is blue (B), green (G) and red (R), now, and result energy display white (W). The color that can show on the display surface of display unit under pinkish red colour field (1/3 frame) is blue (B) and red (R).

Fig. 4 C shows situation in during the frame shown in Fig. 3 C, that turn increase the photodiode of white (W=R, G, B) on the basis of cyan field, pinkish red colour field. In the present embodiment, owing to a frame has been divided into three fields, the thus switching frequency of means of illumination increase compared with the situation that a frame of former enforcement mode has been divided into two fields. But, when having the existing apparatus of W field, it is field, four, R, G, B and W field, compared with existing device, the few field of the situation of present embodiment. Therefore, even if adding W field, the current consumption of present embodiment also can not increase as existing device.

Fig. 5 shows the blue color filter corresponding to wavelength and the transmitance of yellow filter. Further, the rational curve that the luminous energy of the fluor of the LED of blueness (B), the fluor of green (G) and redness (R) changes is shown with wavelength. Represent that the rational curve of the transmitance of blue color filter is almost consistent with the rational curve of the luminous energy of the LED of blue (B). The luminous energy of the fluor of green (G) makes the green glow of the vicinity of 540nm～550nm through yellow filter. The luminous energy of the fluor of red (R) makes the ruddiness of the vicinity of 630nm～650nm through yellow filter.

Fig. 6 is the figure that the opening rate of the pixel with yellow filter in an enforcement mode and the sub-pixel with blue color filter and transmitance are compared with opening rate and the transmitance of the sub-pixel not having spectral filter and illustrated.The opening rate not having the sub-pixel of spectral filter is 78.8%, and transmitance is 25.3%. On the other hand, the opening rate of the sub-pixel with yellow filter implementing mode is 67.0%, and transmitance is 13.0%, and the opening rate with the sub-pixel of blue color filter is 57.8%, and transmitance is 0.34%.

Fig. 7 A shows the key element in order to obtain LED effect and reference. In fig. 7, each brightness (1.7 bear moral draws) and the electric current (30mA) of the LED of the LED of redness (R), the LED of green (G) and blueness (B) is shown. This numeric representation LED may the luminescence drawn of moral and the electric current that needs 30mA in order to obtain 1.7. LED effect is obtained by this value. That is, LED effect is the brightness grade relative to electric current. Such as obtain { (1.7)/30}=0.056. Further, the definition of this LED effect 0.056 is become 100.

On the other hand, Fig. 7 A shows brightness (2.7 bear moral draws) and the electric current (20mA) of fluor LED (the emitting led stacking coating fluor of specified color is configured to export the element of the light of cyan or magenta). This numeric representation fluor LED is in order to obtain 2.7 electric currents born moral and draw and need 20mA. LED effect { (2.7)/20}=0.135 can be obtained by this value. Then, obtain and the relative value 251 of LED effect 0.056=100 above.

In addition, the luminescence of cyan can by making the light-emitting fluophor of green (G) obtain with the LED combination sending blueness (B) light. In addition, the luminescence of magenta can by making the light-emitting fluophor of redness (R) obtain with the LED combination sending blueness (B) light.

In fig. 7, further it is shown that containing duty-cycle loss in interior value. So-called duty-cycle loss, the value of about the 10% such experimental result derivation that declines from LED effect when carrying out the driving based on field sequence exactly.

Therefore, LED effect 100 becomes LED effect 90, LED effect 251 and becomes LED effect 226 when considering duty-cycle loss when considering duty-cycle loss.

Fig. 7 B is by the opening rate in the opening rate of the enforcement mode of the application, transmitance, LED effect and existing field-sequential mode, transmitance, LED effectiveness comparison and the figure that illustrates. The opening rate of the RGB field-sequential mode realized by the timesharing of the LED of LED and B of LED, G of R luminescence and free of light filter is 78.8%, and transmitance is 25.3%, LED effect is 90.

On the other hand, it is being in the first field-sequential mode that cyan, magenta realize by the illuminant colour of blue color filter and yellow filter, backlight, opening rate (B=57.8%, Y=67.8%), transmitance are 13.3%, LED effect be 226 but, the area ratio of B spectral filter and Y spectral filter (be the situation of 1:2). Or, it is being in the 2nd field-sequential mode that cyan, magenta realize by the illuminant colour of blue color filter and yellow filter, means of illumination, opening rate (B=49.9%, Y=73.0%), transmitance are 16.1%, LED effect be 226 but, the area ratio of B spectral filter and Y spectral filter (be the situation of 1:3).

At this, if transmitance a and LED effect b being taken advantage of calculation as the electric energy efficiency of means of illumination, then

Above-mentioned RGB field-sequential mode becomes ... 22.8,

The first above-mentioned field-sequential mode becomes ... 30.1,

The 2nd above-mentioned field-sequential mode becomes ... 36.4.

It can thus be seen that the electric energy efficiency of the means of illumination of the enforcement mode of the application is remarkable.

The distance of color change on a chromaticity diagram Fig. 8 A arrow illustrates that display look changes on the region comprising primary colors R, G, B.In addition, Fig. 8 B arrow illustrates the distance of display look color change on a chromaticity diagram when change on the region of cyan and magenta. As comparing known to both, the region of cyan and magenta shows distance distance look changes changes on the region comprising primary colors R, G, B than display look short. This means that colour difference is little when showing look and changed. Thus, look separation (CBU) is reduced.

Fig. 9 A illustrates other enforcement mode and also has the time figure of the action of the situation of the illuminated field of white (W) at means of illumination except the illuminated field of cyan, the illuminated field of magenta. In order to obtain the illuminated field of white (W), light the fluor LED of cyan and the fluor LED of magenta simultaneously. Therefore, it is not necessary to the photodiode of the such white (W) illustrated in Figure 4 A. This is lighted and controls not shown and performed by the lighting device control circuit (can also be called backlight control circuit) in the driving IC chip CP (shown in Fig. 2) of driving LCD.

Thus, under the illuminated field of cyan, the color table that can carry out green and the blue and green middle shade with indigo plant is existing, and under the illuminated field of magenta, the color table that can carry out red and the blue and red middle shade with indigo plant is existing. Under the illuminated field of white (W), the color table that can carry out red, green, blue (being also exactly white (W)) is existing.

Fig. 9 B is again an other enforcement mode. In the enforcement mode of Fig. 9 A, colour filter employs yellow filter and blue color filter. But, in the enforcement mode of Fig. 9 B, colour filter uses yellow filter, blue color filter and white (W) spectral filter. The sequence of light of means of illumination is identical with the situation of Fig. 9 A. That is, means of illumination also has the illuminated field of white (W) except the illuminated field of cyan, the illuminated field of magenta.

Under the illuminated field of cyan, carrying out blue and green and their color table of middle shade is existing, under the illuminated field of magenta, the color table that can carry out Lan Hehong and their middle shade is existing. And, under the illuminated field of white (W), the color table that can carry out red, green, blue (being also exactly white (W)) is existing.

Figure 10 A is the figure of the enforcement mode illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B). In this embodiment, the area of each spectral filter of (W), yellow (Y), blue (B) is formed equal in vain. The spectral filter of this white (W), yellow (Y), blue (B) is corresponding with sub-pixel separately. The entirety of the spectral filter of white (W), yellow (Y), blue (B) and respective sub-pixel can be called a pixel (or unit picture element). By this pixel, showing any color in RGB, sub-pixel is for the formation of pixel. The shape of this pixel (the composite light filtering sheet of white (W), yellow (Y), blue (B)) is such as square when top view.

Figure 10 B is the figure of the example illustrating the image element circuit corresponding with the spectral filter of Figure 10 A. Each structure of the image element circuit forming each sub-pixel illustrates in fig. 2. That is, the image element circuit of each sub-pixel has switching element separately, and this switching element is such as made up of thin film transistor (TFT), and grid is connected with gate lines G, and source electrode is connected with signal wire S, and the pixel electrode with the liquid crystal driving liquid crystal layer that drains is connected.

Figure 11 A is the figure of the other enforcement mode illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B). In this embodiment, the respective area of the spectral filter of yellow (Y) spectral filter and white (W) formed the area of spectral filter of BELAND (B) is big.

Figure 11 B is the figure of the example illustrating the image element circuit corresponding with the spectral filter of Figure 11 A. Each structure of the image element circuit forming each sub-pixel illustrates in fig. 2. When observing along column direction (second direction Y), the sub-pixel of blue (B) configures continuously. But, when along column direction (second direction Y) observe yellow (Y) sub-pixel and white (W) sub-pixel alternately configure. Further, the sub-pixel of the sub-pixel of yellow (Y) and white (W) also configures when observing along line direction (first party is to X) alternately. In this embodiment, the planeform of pixel (unit picture element) is also square. Each spectral filter being assigned a blueness (B) in addition, in the structure of Figure 11 B, in the spectral filter of the spectral filter of a yellow (Y) and a white (W). That is, in the structure of Figure 11 B, the spectral filter of a blueness (B) is configured in a pixel.

Figure 11 C is the figure of the other example illustrating the image element circuit corresponding with the spectral filter of Figure 11 A. The sub-pixel not being both blueness (B) of the image element circuit shown in Figure 11 B and the image element circuit shown in Figure 11 C is crossed over two row and is formed. That is, source electrode and the grid of the switching element of the sub-pixel of blue (B) are connected with grid wiring G1 and source wiring S1 respectively, and the spectral filter of the pixel electrode and blueness (B) that comprise sub-pixel is formed from the first row expansion to the 2nd row together with this switching element. Like this, the spectral filter of the spectral filter of a yellow (Y) and a white (W) is had by the spectral filter of a blueness (B). That is, in the structure of Figure 11 C, the spectral filter of a blueness (B) is crossed over multiple pixel and is configured.

Figure 12 A is the figure of the other enforcement mode again illustrating the situation that spectral filter comprises white (W), yellow (Y), blue (B). This enforcement mode is at line direction (first party is to X) the above sub-pixel of repeated configuration yellow (Y) and the sub-pixel of white (W) of the first row, configuring the sub-pixel of blueness (B) on the line direction (first party is to X) of the 2nd row, the sub-pixel of a blueness (B) has the length of white (W) with yellow (Y) two sub-pixels. Such as in Figure 12 B of example illustrating the image element circuit corresponding with the spectral filter of Figure 12 A, source electrode and the grid of the switching element of the sub-pixel of blue (B) are connected with grid wiring G2 and source wiring S2 respectively, and the spectral filter of the pixel electrode and blueness (B) that comprise sub-pixel is formed from the first row expansion to the 2nd row together with this switching element. In this embodiment, the planeform of pixel (unit picture element) is also square.

Figure 12 C is the figure of the other example illustrating the image element circuit corresponding with the spectral filter of Figure 12 A. Illustrate that the image element circuit shown in Figure 12 B is different from the image element circuit shown in Figure 12 C. The sub-pixel of the blueness (B) of Figure 12 B is crossed over two row and is formed, and the sub-pixel of the blueness (B) shown in Figure 12 C is formed on each row.

Figure 13 is the figure of the example of the curve of the spectrophotometric transmittance illustrating the spectral filter of blueness (B) and the spectral filter of yellow (Y). The spectral filter of blue (B) is easy to make the light of the wavelength near 450nm through (this transmitance is set to such as Tb). The spectral filter of yellow (Y) is easy to make the light of the wavelength near 580nm through (this transmitance is set to such as Ty).

Figure 14 is the explanation figure illustrating the spectral filter of blueness (B) and the calculated example of the spectral filter of yellow (Y) and the area ratio of pixel. Such as the width of the spectral filter of yellow (Y) is a, and the width of the spectral filter of blue (B) is b, and the length assuming two spectral filters is identical.So, it is possible to it is expressed as

Area ratio=the b/ (a+b) of the spectral filter of blue (B)

Area ratio=the a/ (a+b) of the spectral filter of yellow (Y).

As mentioned above, due to spectral transmittance Tb, Ty of the spectral filter of known blueness (B) and the spectral filter of yellow (Y), the transmitance ratio of colour filter thus can be obtained by area ratio (b/ (a+b)), (a/ (a+b)) of this spectral filter spectral transmittance Tb, Ty and the spectral filter of blueness (B) and the spectral filter of yellow (Y).

The transmitance ratio of colour filter is if expression is (Tb × b/ (a+b))/(Ty × a/ (a+b))

Figure 15 is the figure of the characteristic example illustrating the spectral brightness when magenta LED and the cyan LED luminescence simultaneously making means of illumination. The energy height of the light of the wavelength near the characteristic display 450nm of spectral brightness and near 580nm. But, the energy of the light of the wavelength near 450nm is stronger than the energy of the light of the wavelength near 580nm. The luminance factor of magenta and cyan can be obtained by this characteristic. The luminance factor of so-called means of illumination can be obtained by such as (brightness of 450nm brightness/580nm).

Figure 16 is the chroma offset amount Δ y counted based on the chroma point from the white becoming primary standard of color and illustrates the figure of the relation of transmitance ratio (Tb × b/ (a+b))/(Ty × a/ (a+b)) of colour filter above with the luminance factor (brightness of 450nm brightness/580nm) of means of illumination.

, in figure 16, in addition the transmitance of colour filter ratio is illustrated in transverse axis, the luminance factor of means of illumination is illustrated in the longitudinal axis.

At this, means of illumination luminance factor is the ratio calculating (brightness of 450nm brightness/580nm) in the characteristic (shown in Figure 15) of the spectral brightness when having lighted magenta and the cyan of means of illumination simultaneously.

Below Δ y=-0.02

Δ y=-0.02～0.00

Δ y=0.00～0.02

Δ y=0.02～0.04

Δ y=0.04～0.06

More than Δ y=0.06

Illustrate by graphic representation. The characteristic line of the offset Δ y=0.00 counted from the chroma point of white is illustrated by thick dotted line. If offset Δ y is less than 0.00, then just can obtain the white becoming primary standard of color well.

Therefore, in the design phase, as long as determining either one of transmitance ratio of the luminance factor of means of illumination or colour filter, then just can utilize the characteristic of this graphic representation and determine transmitance ratio or the luminance factor of the opposing party.

As the above description, the spectral filter transmitance ratio obtained by the area ratio of the spectral filter of blueness with the spectral filter of yellow and magenta are the characteristics comprising the white point position this point maintaining on chromaticity diagram with the mutual relationship of the spectral brightness ratio of the light of cyan. Therefore, above-mentioned mutual relationship can be set to the characteristic of the white point position maintaining on chromaticity diagram.

The formula representing the characteristic line of above-mentioned graphic representation is such as

× 265-0.419 (the transmitance ratio of colour filter)

The luminance factor of-0.041 × means of illumination=Δ y. Offset Δ y be less than 0.00 situation can represent for Δ y≤0.

According to above-mentioned enforcement mode, it may be possible to provide not making declines widely through efficiency can suppress display unit and the display packing of power consumption on the whole.

That is, according to the device of the mode of enforcement, owing to having colour filter, therefore compared with the device of the field-sequential mode not having spectral filter, the electric energy efficiency (LED effect) of means of illumination is high, and therefore electric energy efficiency is outstanding on the whole.

The one side of disclosed invention, for so following:

(1) a kind of display unit has: along first party to and multiple sub-pixel of arranging to the second direction intersected with described first party colour filter corresponding with each sub-pixel and means of illumination,

Described colour filter at least comprises adjacent blue color filter and yellow filter,

Described means of illumination has light source, during the light output at least having a cyan during a frame of the light exported from light source and during the light output of magenta.

(2) display unit Gen Ju (1), wherein, described display unit also comprises the sub-pixel of the spectral filter with white.

(3) display unit Gen Ju (1), wherein, described light source during a described frame in also there is the light exporting white during.

(4) display unit Gen Ju (1), wherein, during also there is the light exporting white during a described frame of the light exported from described light source, it is during the light of described cyan and the light of magenta are lighted simultaneously during the light of described output white.

(5) display unit Gen Ju (1), wherein, described in the area ratio of the spectral filter of described blueness, the area of the spectral filter of yellow is little.

(6) display unit Gen Ju (1), wherein, the spectral filter of the spectral filter with described blueness and described yellow and planeform is comprised roughly for the pixel of square or there is the spectral filter of described blueness, the spectral filter of described yellow and the spectral filter of white and planeform is roughly the pixel of square.

(7) display unit Gen Ju (1), wherein, arranges the spectral filter of described blueness in said first direction, arranges the spectral filter of described yellow and the spectral filter of white in said first direction alternately.

(8) display unit Gen Ju (1), wherein, arranges the spectral filter of described blueness in this second direction, arranges the spectral filter of described yellow and the spectral filter of white in this second direction alternately.

(9) display unit Gen Ju (7), wherein, distributes a blue spectral filter respectively to the spectral filter of a yellow and a white spectral filter.

(10) display unit Gen Ju (8), wherein, distributes a blue spectral filter respectively to the spectral filter of a yellow and a white spectral filter.

(11) display unit Gen Ju (7), wherein, a blue spectral filter is common by the spectral filter of a yellow and a white spectral filter.

(12) display unit Gen Ju (8), wherein, a blue spectral filter is common by the spectral filter of a yellow and a white spectral filter.

(13) display unit Gen Ju (1), wherein, described light source is controlled based on backlight control circuit.

(14) display unit Gen Ju (1), wherein, the mutual relationship between the spectral filter transmitance ratio obtained by the area ratio of the spectral filter of blueness and the spectral filter of yellow and the spectral brightness ratio of the light of magenta and cyan is the characteristic of the white point position maintaining on chromaticity diagram.

(15) driving method for display unit, wherein, this display unit has: along first party to and with described first party to multiple sub-pixel colour filter corresponding with each sub-pixel of the second direction arrangement intersected and means of illumination,

Described means of illumination during a frame at least export the light of cyan and the light of magenta.

(16) driving method of display unit Gen Ju (15), wherein, described means of illumination during a described frame in export the light of white.

(17) driving method of display unit Gen Ju (15), wherein, described means of illumination during a described frame in export the light of white, in the field of light exporting white, light the light of described cyan and the light of magenta simultaneously.

Although having described some enforcement mode of the present invention, but, these enforcement modes are just provided by way of example, it is not intended that limit the scope of the invention. In fact, illustrated herein various novel method and system can embody with other various form. And, under the premise of without departing from the spirit of the present invention, it is possible to the form of the method illustrated by this paper and system is done various omission, replacement and change. Claims item and its jljl such as grade are intended to contain these forms or amendment, fall in the scope and spirit of the present invention simultaneously.

Claims

1. a display unit, it is characterised in that, have:

Multiple sub-pixel, along first party to and with described first party to intersect second direction arrangement;

Colour filter is corresponding with each sub-pixel; And

Means of illumination,

2. display unit according to claim 1, it is characterised in that, described display unit also comprises the sub-pixel of the spectral filter with white.

3. display unit according to claim 1, it is characterised in that, described light source during a described frame in also have export white light during.

4. display unit according to claim 1, it is characterized in that, during also there is the light exporting white during a described frame of the light exported from described light source, it is during the light of described cyan and the light of magenta are lighted simultaneously during exporting the light of described white.

5. display unit according to claim 1, it is characterised in that, described in the area ratio of the spectral filter of described blueness, the area of the spectral filter of yellow is little.

6. display unit according to claim 1, it is characterized in that, described display unit comprises the spectral filter of the spectral filter with described blueness and described yellow and planeform is the pixel of square or has the spectral filter of described blueness, the spectral filter of described yellow and a spectral filter of white and planeform is the pixel of square.

7. display unit according to claim 1, it is characterised in that, it is arranged with the spectral filter of described blueness in said first direction, it is arranged with the spectral filter of described yellow and the spectral filter of white in said first direction alternately.

8. display unit according to claim 1, it is characterised in that, it is arranged with the spectral filter of described blueness in this second direction, it is arranged with the spectral filter of described yellow and the spectral filter of white in this second direction alternately.

9. display unit according to claim 7 or 8, it is characterised in that, distribute a blue spectral filter respectively to the spectral filter of a yellow and a white spectral filter.

10. display unit according to claim 7 or 8, it is characterised in that, a blue spectral filter is common by the spectral filter of a yellow and a white spectral filter.

11. display unit according to claim 1, it is characterised in that, described light source is controlled based on backlight control circuit.

12. display unit according to claim 1, it is characterized in that, the mutual relationship between the spectral filter transmitance ratio obtained by the area ratio of the spectral filter of described blueness and the spectral filter of described yellow and the spectral brightness ratio of the light of magenta and cyan is the characteristic of the white point position maintaining on chromaticity diagram.

The driving method of 13. 1 kinds of display unit, it is characterised in that,

Described display unit has: along first party to and with described first party to multiple sub-pixel colour filter corresponding with each sub-pixel of the second direction arrangement intersected and means of illumination,

The driving method of 14. display unit according to claim 13, it is characterised in that, described means of illumination during a described frame in export white light.

The driving method of 15. display unit according to claim 13, it is characterised in that, described means of illumination during a described frame in export white light, export white light field in, light the light of described cyan and the light of described magenta simultaneously.