JP2007187974A - Method for driving color liquid crystal display device assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for driving a color liquid crystal display assembly by which luminance of a backlight can be varied according to the area of a screen portion displaying white so as to particularly impart a brilliant appearance to a portion of an image displaying white. <P>SOLUTION: In the driving method of the present invention, only a surface light source unit satisfying the following conditions is operated to enhance the luminance. The conditions are: (1) the average maximum of light emission control signals (X<SB>R</SB>, X<SB>G</SB>, X<SB>B</SB>) supplied to a red light emitting sub-pixel, a green light emitting sub-pixel and a blue light emitting sub-pixel, respectively, of each pixel constituting a color liquid crystal display device is in a proportion equal to or higher than a predetermined value; (2) the number of white display pixels in which all of the light emission control signals (X<SB>R</SB>, X<SB>G</SB>, X<SB>B</SB>) of three colors supplied to one pixel are equal to or larger than a given value is within a given range of proportions; (3) a group of white display pixels possesses an area equal to or larger than a given value; and (4) the number of surface light sources with enhanced luminance corresponding to display region units with enhanced luminance is equal to or smaller than a given value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for driving a color liquid crystal display device assembly including a color liquid crystal display device and a planar light source device.

  In a color liquid crystal display device, the liquid crystal itself does not emit light. Therefore, for example, a direct type planar light source device (backlight) for irradiating the color liquid crystal display device is disposed on the back surface of the color liquid crystal display device. Then, by operating the liquid crystal cell constituting each pixel as a kind of light shutter (light valve), that is, by controlling the light transmittance of each pixel, light emitted from the surface light source device ( For example, the light transmittance of white light) is controlled to display an image.

  Conventionally, a planar light source device in a color liquid crystal display device assembly illuminates the entire display area with uniform and constant brightness, but has a different configuration from such a planar light source device, that is, A planar light source device having a configuration that changes the illuminance distribution in a display region that includes a plurality of planar light source units and includes pixels arranged in a two-dimensional matrix of a color liquid crystal display device. This is well known from Japanese Unexamined Patent Application Publication No. 2004-212503 and Japanese Patent Application Laid-Open No. 2004-246117.

  In addition, as described in May 2005, Optoelectronic Industry and Technology Promotion Association, 2004 FY-003 Optical Technology Trend Survey Report, page 313, a television having a conventional cathode ray tube. John receivers and plasma display devices are equipped with an automatic beam limit circuit (Auto Beam Limit circuit, ABL circuit) and an automatic power limit circuit (Auto Power Limit circuit, APL circuit) to limit the load factor. When the screen is white, the brightness is lowered to prevent an excessive increase in power and an adverse effect on the device life. On the contrary, if the area of the screen that displays white is small, the luminance of the portion of the screen that displays white is relatively increased compared to the case where the entire screen is displayed in white. Brings a sense of shine. For broadcast waves and the like, picture creation (video signal generation) is performed on the premise of the characteristics of such television receivers and plasma display devices. Therefore, the video signal carried by the broadcast wave is set so that the brightness of the portion of the screen displaying white is high (RGB value is large).

JP 2004-212503 A JP 2004-246117 A May 2005, Optoelectronic Industry and Technology Promotion Association, page 313 of the 2004 FY-003 Optical Technology Trend Survey Report (http://www.oitda.or.jp/main/technology/ technology2004.html) Nikkei Electronics December 20, 2004 No. 889, page 128

  By the way, the current color liquid crystal display device is not provided with the ABL circuit and the APL circuit described above. Therefore, since the video signal carried by the broadcast wave is normally reproduced as it is, the brightness in the color liquid crystal display device is the same regardless of whether the area of the screen displaying white is small or large, There is a problem that there is no shine in the image portion.

  Accordingly, an object of the present invention is to change the luminance of the direct type planar light source device (backlight) in accordance with the area of the screen portion displaying white, and in particular, to give a sense of brightness to the portion of the image displaying white. Another object of the present invention is to provide a method of driving a color liquid crystal display device assembly that enables this.

In order to achieve the above object, a method for driving a color liquid crystal display device assembly of the present invention comprises:
(A) A display area in which a total of M ₀ × N ₀ pixels, M ₀ along the first direction and N ₀ along the second direction, are arranged in a two-dimensional matrix is P × Q. A color liquid crystal display device that is divided into a plurality of display area units, and each display area unit includes a plurality of pixels;
(B) P × Q planar light source units corresponding to P × Q display area units, and each planar light source unit illuminates the display area unit corresponding to the planar light source unit from the back side. Light source device, and
(C) a driving circuit for driving the color liquid crystal display device and the planar light source device;
With
Each pixel is configured as a set of three subpixels, a red light emitting subpixel, a green light emitting subpixel, and a blue light emitting subpixel,
A red light emission control signal for controlling the light transmittance of the red light emission subpixel, a green light emission subpixel, a green light emission subpixel, and a red light emission subpixel that constitutes each pixel from the drive circuit. A method for driving a color liquid crystal display device assembly, which supplies a green light emission control signal for controlling light transmittance and a blue light emission control signal for controlling light transmittance of a blue light emitting subpixel,
When the maximum value of the red light emission control signal, the green light emission control signal, and the blue light emission control signal supplied to the pixel is X _max ,
(A) The value of the red light emission control signal supplied to each of the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel in each pixel constituting the color liquid crystal display device is set to X _R , the green light emission control signal. The maximum value among the three types of light emission control signal values (X _R , X _G , X _B ) supplied to one pixel is X _G and the value of the blue light emission control signal is X _B. Is represented by Max [X _R , X _G , X _B ], the average value Ave _MAX [X _R , X _G , X _B ] of Max [X _R , X _G , X _B ] in all pixels is
Ave _MAX [X _R , X _G , X _B ] ≦ a ₀ · X _max (1)
(Where a ₀ is a constant)
Is satisfied, and if the expression (1) is satisfied,
(B) The values (X _R , X _G , X _B ) of the three types of light emission control signals supplied to one pixel are:
X _R ≧ k ₁ · X _max (2-1)
X _G ≧ k ₁ · X _max (2-2)
X _B ≧ k ₁ · X _max (2-3)
(Where k ₁ is a coefficient within the range of 0.90 ≦ k ₁ ≦ 0.99)
When a pixel that satisfies the above condition exists as a white display pixel, when the number of white display pixels is NC
a ₁ × M ₀ × N ₀ ≦ NC ≦ a ₂ × M ₀ × N ₀ (3)
(Where a ₁ and a ₂ are constants)
Is satisfied, and if the expression (3) is satisfied,
(C) It is examined whether or not there are a _M × M ₀ (a _M is a constant) or more white display pixels continuously along the first direction, and the white display pixels are the second ones. It is checked whether or not a _N × N ₀ (a _N is a constant) continuously exist along the direction, and if there are, display area units including these white display pixels are displayed with increased brightness. An area unit, then
(D) When the number of planar light source units corresponding to the luminance increase display area unit is NB,
NB ≦ a ₃ × P × Q (4)
(Where a ₃ is a constant)
Is satisfied, and if the expression (4) is satisfied,
(E) Increasing the luminance of the planar light source unit corresponding to the luminance increase display area unit;
It consists of each process.

here,
As the value of a _0, the value of any value a ₂ within the range of 0 ≦ a ₁ ≦ 0.02 as the value of any value a ₁ within the range of 0.6 ≦ a ₀ ≦ 0.8 As a value of any value a ₃ in the range of 0.05 ≦ a ₂ ≦ 0.1, as a value of any value a _M in the range of 0.05 ≦ a ₃ ≦ 0.1, As a value of any value a _N within the range of 0.05 ≦ a _M ≦ 0.1, any value within the range of 0.05 ≦ a _N ≦ 0.1 can be exemplified.

Further, in step (C), it is checked whether or not there are a _M × M ₀ or more white display pixels continuously along the first direction. Here, “continuously” means a Not only when all of _M × M ₀ are white display pixels, but also, for example, β _M × a _M × M ₀ (where β _M > 1, for example, β _M = 1.1) This includes the case where there are a _M × M ₀ white display pixels among the pixels to be processed. Further, it is examined whether or not a _N × N ₀ or more white display pixels exist continuously along the second direction. Here, “continuously” means a _N × N ₀ pieces. Not only when all of the pixels are white display pixels, for example, β _N × a _N × N ₀ (where β _N > 1 and, for example, β _N = 1.1), a _This includes the case where _N × N ₀ white display pixels exist.

In the driving method of the color liquid crystal display device assembly of the present invention, in the step (E), when the luminance of the planar light source unit (luminance increasing planar light source unit) corresponding to the luminance increasing display area unit is increased, An average value (X _R + X _G + X _B ) / 3 of the values of the three kinds of light emission control signals in each pixel constituting the luminance increase display area unit is obtained for all pixels constituting the luminance increase display area unit; When the maximum of the average value of the three types of light emission control signals is X _{ave_max} ,
_{X (U) max = X ave_max} + k 0 · X max (5)
(Where k ₀ is a coefficient within the range of 0.06 ≦ k ₀ ≦ 0.3)
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, In the step (E), the luminance of the planar light source unit (luminance increasing planar light source unit) corresponding to the luminance increasing display area unit can be increased so that the luminance is obtained. In addition, such a form may be called the drive method which concerns on the 1st form of this invention for convenience.

In such a driving method according to the first aspect of the present invention, each white display pixel [each of the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, which constitutes the luminance increase display area unit. All the values (X _R , X _G , X _B ) of the light emission control signal supplied to the pixel are k ₁ times (k ₁ <1) the maximum value X _max of the light emission control signal supplied to the pixel. A bias (k ₀ · X _max ) is set to the average value of three light emission control signal values (X _R , X _G , X _B ) for each of the sub-pixels of a pixel that is equal to or greater than a certain upper threshold (k ₁ · X _max ) ) Increase the brightness of the brightness increasing planar light source unit corresponding to the brightness increasing display area unit so that the brightness of the pixel when it is assumed that a light emission control signal having a signal value corresponding to the value obtained by adding) is supplied. Therefore, the luminance increase that the white display pixels continuously occupy a certain area. The brightness level of the display area unit can be higher than the brightness level of other display area units (non-brightness increasing display area units), and the white brightness similar to the white brightness of the cathode ray tube is more reliably achieved. Can do.

Here, in the driving method according to the first aspect of the present invention, the planar light source unit is composed of a light emitting diode (LED), and the luminance of the planar light source unit is increased or decreased to emit light constituting the planar light source unit. A configuration in which the duty period is controlled in the pulse width modulation control of the diode can be employed. And in this case
_{X (U) max = (1} + k 0) X max (6)
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, The duty period D _{0 at which} brightness can be obtained is when the maximum duty period is D _max .
D ₀ = α ₀ · D _max (7)
(However, α ₀ is a coefficient within the range of 0.95 ≦ α ₀ ≦ 1.0)
It is desirable that In addition, a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₁ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. When the maximum duty period is D _max , the duty period D _{1 in which} the brightness of the pixel when assuming that
D ₁ = α ₁ · D _max (8)
(However, α ₁ is a coefficient within the range of 0.3 ≦ α ₁ ≦ 0.8)
It is desirable to satisfy

In the driving method of the color liquid crystal display device assembly of the present invention including the above-described preferable configuration and the driving method according to the first aspect of the present invention, the surface other than the luminance increasing planar light source unit in the step (E) In the non-brightness increasing display area unit corresponding to the light source unit (non-brightness increasing planar light source unit), the red light emitting subpixel, the green light emitting subpixel, red emission control signal supplied to the blue light-emitting sub-pixel, green light-emitting control signal, and, 'when the (U) _max, according X' the maximum value of the blue emission control signal X corresponding to (U) _max The luminance of the pixel is obtained when it is assumed that the red light emission control signal, the green light emission control signal, and the blue light emission control signal having values are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. As described above, the luminance of the planar light source unit (non-luminance increasing planar light source unit) corresponding to the non-luminance increasing display region unit can be increased or decreased. In addition, such a form may be called the drive method which concerns on the 2nd form of this invention for convenience. In such a configuration, the γ (gamma) characteristic slightly deviates from the desired characteristic and the image quality slightly changes, but there is practically no problem.

In such a driving method according to the second aspect of the present invention, in each of the non-luminance increasing planar light source units, the value of the light emission control signal (X _R , X Non-luminance increase so that the luminance of the pixel is obtained when it is assumed that the emission control signal having a value corresponding to the maximum value X ′ (U) _max of _G , X _B ) is supplied to each sub-pixel Since the brightness of the non-brightness increasing planar light source unit corresponding to the display area unit is increased or decreased, the contrast ratio can be further improved.

Here, even in the driving method according to the second aspect of the present invention, the planar light source unit is composed of a light emitting diode (LED), and the luminance of the planar light source unit is increased or decreased to emit light constituting the planar light source unit. A configuration in which the duty period is controlled in the pulse width modulation control of the diode can be employed. In this case, in the non-luminance increasing display area unit corresponding to the planar light source unit (non-luminance increasing planar light source unit) other than the luminance increasing planar light source unit in the step (E),
X ′ (U) _max ≦ k ₂ · X _max (9)
(Where k ₂ is a coefficient within the range of 0.1 ≦ k ₂ ≦ 0.2)
The red light emission control signal, the green light emission control signal, and the blue light emission control signal having values corresponding to k ₂ · X _max are _supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. It is preferable to control the luminance of the planar light source unit (non-luminance increasing planar light source unit) corresponding to the non-luminance increasing display area unit so that the luminance of the pixel when it is assumed that the pixel is supplied is obtained. By adopting the above-described configuration in which Expression (9) is set, it is possible to maintain the γ (gamma) characteristic as much as possible and to prevent the image quality from changing while increasing the contrast ratio. As a relation between k ₁ and k ₂ ,
0.1 ≦ k ₂ / k ₁ ≦ 0.22
Can be illustrated. Further, a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₂ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. When the maximum duty period is D _max , the duty period D ₂ for obtaining the brightness of the pixel when assuming that
D ₂ = α ₂ · D _max (10)
(However, α ₂ is a coefficient within the range of 0.01 ≦ α ₂ ≦ 0.2)
It is desirable to satisfy When the contrast ratio of the color liquid crystal display device itself is 10 ³ : 1, if α ₂ = 0.2, the contrast ratio is improved to 5 × 10 ³ : 1 and α ₂ = 0.01. If so, the contrast ratio is improved to 10 ⁵ : 1.

In the driving method of the color liquid crystal display device assembly of the present invention including the various preferable modes and configurations described above (hereinafter, simply referred to as the present invention), various values X _R , X _G , The red light emission control signal, the green light emission control signal, and the blue light emission control signal having X _B (where X _R = X _G = X _B ) are the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. The brightness value and the duty period value of the planar light source unit for obtaining the brightness of the pixel when actually supplied are subjected to various tests and obtained in advance. It is desirable to store various data based on these relationships in the drive circuit. Also, X _max , a ₀ , a ₁ , a ₂ , a ₃ , a _M , a _N , k ₀ , k ₁ , k ₂ , α ₀ , α ₁ , α ₂ , D _max , D ₀ , D ₁ , Various parameters such as D ₂ are also preferably stored in the drive circuit.

  In the planar light source device, a plurality of red light emitting diodes emitting red (for example, wavelength 640 nm), a plurality of green light emitting diodes emitting green (for example, wavelength 530 nm), and blue (for example, wavelength 450 nm). Are arranged and arranged in the housing. In addition, you may further provide the light emitting diode which light-emits 4th color other than red, green, and blue. Alternatively, a white light-emitting diode (for example, a light-emitting diode that emits white light by combining an ultraviolet or blue light-emitting diode and phosphor particles) can also be used.

  And the planar light source unit which comprises a planar light source device can be obtained by dividing a some light emitting diode by a partition, for example. (1 red light emitting diode, 1 green light emitting diode, 1 blue light emitting diode), (1 red light emitting diode, 2 green light emitting diodes, 1 blue light emitting diode), (2 red light emitting diodes, 2 green light emitting diodes) Assuming that a planar light source unit is composed of light emitting diode units that are mixed in color and emit white light as a whole, a single planar light source unit is formed. Is provided with at least one light emitting diode unit. Alternatively, one planar light source unit is provided with at least one white light emitting diode.

  The light emitting diode may have a so-called face-up structure or a flip chip structure. That is, the light-emitting diode includes a substrate and a light-emitting layer formed on the substrate, and may have a structure in which light is emitted from the light-emitting layer to the outside, or light from the light-emitting layer passes through the substrate. It is also possible to adopt a structure that is injected outside. More specifically, the light emitting diode (LED) is formed on, for example, a first cladding layer and a first cladding layer made of a compound semiconductor layer having a first conductivity type (for example, n-type) formed on a substrate. The active layer, and a second clad layer stack structure comprising a compound semiconductor layer having a second conductivity type (for example, p-type) formed on the active layer, and electrically connected to the first clad layer. One electrode and a second electrode electrically connected to the second cladding layer are provided. The layer constituting the light emitting diode may be made of a known compound semiconductor material depending on the emission wavelength.

  It is desirable that the luminance in a certain planar light source unit is not affected as much as possible by the adjacent planar light source unit. Specifically, a lens having a strong light intensity in the straight direction, such as the Lambertian method, may be attached to the light emitting portion of the light emitting diode, or between the surface light source unit and the surface light source unit. An opaque partition may be disposed for the illumination light of the light source unit.

  When the light emitted from the light emitting diode is directly incident on the color liquid crystal display device positioned above, that is, when the light is emitted exclusively from the light emitting diode along the z-axis direction, the luminance is applied to the planar light source device. Unevenness may occur. As a means for avoiding such a phenomenon, a light-emitting diode assembly in which a light extraction lens is attached to the light-emitting diode is used as a light source, and light emitted from the light-emitting diode is totally reflected on the top surface of the light extraction lens. A two-dimensional direction emission configuration that is reflected and emitted mainly in the horizontal direction of the light extraction lens can be given. Such a configuration is disclosed, for example, on page 128 of Nikkei Electronics No. 889, December 20, 2004.

  Furthermore, the planar light source device may be configured to include an optical function sheet group such as a diffusion plate, a diffusion sheet, a prism sheet, and a polarization conversion sheet, and a reflection sheet.

  A transmissive color liquid crystal display device includes, for example, a front panel having a transparent first electrode, a rear panel having a transparent second electrode, and a liquid crystal disposed between the front panel and the rear panel. Made of material.

  Here, more specifically, the front panel is, for example, a first substrate made of a glass substrate or a silicon substrate, and a transparent first electrode (also called a common electrode) provided on the inner surface of the first substrate. For example, it is made of ITO) and a polarizing film provided on the outer surface of the first substrate. Furthermore, the front panel has a configuration in which a color filter covered with an overcoat layer made of acrylic resin or epoxy resin is provided on the inner surface of the first substrate, and a transparent first electrode is formed on the overcoat layer. have. An alignment film is formed on the transparent first electrode. Examples of the color filter arrangement pattern include a delta arrangement, a stripe arrangement, a diagonal arrangement, and a rectangle arrangement. On the other hand, the rear panel more specifically includes, for example, a second substrate made of a glass substrate or a silicon substrate, a switching element formed on the inner surface of the second substrate, and conduction / non-conduction by the switching element. A transparent second electrode to be controlled (also called a pixel electrode, which is made of, for example, ITO) and a polarizing film provided on the outer surface of the second substrate. An alignment film is formed on the entire surface including the transparent second electrode. Various members and liquid crystal materials constituting these transmissive color liquid crystal display devices can be composed of known members and materials. Examples of the switching element include a three-terminal element such as a MOS type FET and a thin film transistor (TFT) formed on a single crystal silicon semiconductor substrate, and a two-terminal element such as an MIM element, a varistor element, and a diode.

  Note that an area where the transparent first electrode and the transparent second electrode overlap and includes a liquid crystal cell corresponds to one sub-pixel. The red light-emitting subpixel constituting each pixel (pixel) is composed of a combination of the region and a color filter that transmits red, and the green light-emitting subpixel is a combination of the region and a color filter that transmits green. The blue light emitting subpixel is composed of a combination of such a region and a color filter that transmits blue. The arrangement pattern of the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel matches the arrangement pattern of the color filter described above.

When expressed in pixels arranged in a two-dimensional matrix the number M ₀ × N ₀ of _{(pixels) (M 0, N 0)} , the value of (M _0, N _0), specifically, VGA ( 640,480), 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), (1920, 1035), (720, 480), (1280, 960), and some other image display resolutions. It is not limited to these values. Further, the relationship between the value of (M ₀ , N ₀ ) and the value of (P, Q) is not limited, but can be exemplified in Table 1 below. The number of pixels constituting one display area unit can be 20 × 20 to 320 × 240, preferably 50 × 50 to 200 × 200. The number of pixels in the display area unit may be constant or different.

  The drive circuit for driving the color liquid crystal display device and the planar light source device includes, for example, a pulse width modulation (PWM) signal generation circuit, a duty ratio control circuit, a light emitting diode (LED) drive circuit, an arithmetic circuit, and a storage device (memory). ) And the like, and a liquid crystal display device driving circuit including a known circuit such as a timing controller. Control of pixel luminance (sometimes referred to as display luminance) and planar light source unit luminance (sometimes referred to as light source unit luminance) is performed for each frame. Note that the number of image information (images per second) sent to the drive circuit as electrical signals per second is the frame frequency (frame rate), and the inverse of the frame frequency is the frame time (unit: seconds).

In the present invention, specific conditions, that is,
(1) The average value Ave _MAX [X _R , X _G , X _B ] of Max [X _R , X _G , X _B ] in all the pixels constituting the color liquid crystal display device is a certain ratio or more.
(2) The number of pixels (white display pixels) in which all of the three types of light emission control signal values (X _R , X _G , X _B ) supplied to one pixel are greater than a certain value, or It is within the range of the ratio.
(3) The aggregate of white display pixels has a size greater than a certain value.
(4) The number of luminance increasing planar light source units corresponding to the luminance increasing display area unit is not more than a certain value.
Only the planar light source unit that satisfies the above conditions increases its luminance. Accordingly, when the area of the screen portion displaying white is small, the luminance in the color liquid crystal display device is higher than when the area of the screen portion displaying white is large, and in particular, the white image portion is radiant. Can be given.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings. Prior to that, an outline of a transmissive color liquid crystal display device, a planar light source device, and a drive circuit suitable for use in each embodiment will be described. .

As shown in the schematic plan view in FIG. 10, a color liquid crystal display device 10 in each example, the _zero M along a first direction, ₀ N-along a second direction, the total M ₀ A display area in which × N ₀ pixels are arranged in a two-dimensional matrix is divided into P × Q display area units, and each display area unit is composed of a plurality of pixels. Specifically, for example, the image display resolution satisfies the HD-TV standard, and the number M ₀ × N ₀ of pixels (pixels) arranged in a two-dimensional matrix is expressed as (M ₀ , N ₀ ). For example, (1920, 1080). In addition, a display area 11 (indicated by a one-dot chain line in FIG. 10) composed of pixels arranged in a two-dimensional matrix is divided into P × Q display area units 12 (the boundary is indicated by a dotted line). . Here, the value of (P, Q) is, for example, (19, 12). However, in order to simplify the drawing, the number of display area units 12 (and a planar light source unit 42 described later) in FIG. 10 is different from this value. Each display area unit 12 is composed of a plurality of (M × N) pixels, and the number of pixels constituting one display area unit 12 is, for example, about 10,000. Each pixel is composed of three sub-pixels (sub-pixels): a red light-emitting subpixel, a green light-emitting subpixel, and a blue light-emitting subpixel.

  The color liquid crystal display device 10 includes a front panel 20 provided with a transparent first electrode 24, a rear panel 30 provided with a transparent second electrode 34, and a schematic partial sectional view shown in FIG. The liquid crystal material 13 is disposed between the front panel 20 and the rear panel 30.

  The front panel 20 includes, for example, a first substrate 21 made of a glass substrate and a polarizing film 26 provided on the outer surface of the first substrate 21. A color filter 22 covered with an overcoat layer 23 made of acrylic resin or epoxy resin is provided on the inner surface of the first substrate 21, and a transparent first electrode (also called a common electrode) is provided on the overcoat layer 23. (For example, made of ITO) 24 is formed, and an alignment film 25 is formed on the transparent first electrode 24. On the other hand, the rear panel 30 more specifically includes, for example, a second substrate 31 made of a glass substrate, and switching elements (specifically, thin film transistors and TFTs) formed on the inner surface of the second substrate 31. 32, a transparent second electrode (also referred to as a pixel electrode, made of, for example, ITO) 34 whose conduction / non-conduction is controlled by the switching element 32, and a polarizing film 36 provided on the outer surface of the second substrate 31, It is composed of An alignment film 35 is formed on the entire surface including the transparent second electrode 34. The front panel 20 and the rear panel 30 are joined via a sealing material (not shown) at their outer peripheral portions. Note that the switching element 32 is not limited to a TFT, and may be composed of, for example, an MIM element. Reference numeral 37 in the drawing is an insulating layer provided between the switching element 32 and the switching element 32.

  Various members and liquid crystal materials constituting these transmissive color liquid crystal display devices can be composed of well-known members and materials, and thus detailed description thereof is omitted.

  The direct type planar light source device (backlight) 40 includes P × Q planar light source units 42 corresponding to the P × Q display area units 12, and each planar light source unit 42 includes a planar light source 42. The display area unit 12 corresponding to the unit 42 is illuminated from the back. In addition, although the planar light source device 40 is located below the color liquid crystal display device 10, the color liquid crystal display device 10 and the planar light source device 40 are separately displayed in FIG. The arrangement and arrangement of light emitting diodes and the like in the planar light source device are schematically shown in FIG. 12A, and a schematic partial sectional view of the planar light source device and the color liquid crystal display device assembly is shown in FIG. Shown in B).

  The planar light source device 40 includes a housing 51 having an outer frame 53 and an inner frame 54. The end of the transmissive color liquid crystal display device 10 is held by the outer frame 53 and the inner frame 54 so as to be sandwiched between the spacers 55A and 55B. A guide member 56 is disposed between the outer frame 53 and the inner frame 54 so that the color liquid crystal display device 10 sandwiched between the outer frame 53 and the inner frame 54 does not shift. A diffusion plate 61 is attached to the inner frame 54 via a spacer 55 </ b> C and a bracket member 57 in the upper portion of the housing 51. On the diffusion plate 61, an optical function sheet group such as a diffusion sheet 62, a prism sheet 63, and a polarization conversion sheet 64 is laminated.

  A reflection sheet 65 is provided inside and below the housing 51. Here, the reflection sheet 65 is disposed so that the reflection surface thereof faces the diffusion plate 61, and is attached to the bottom surface 52 </ b> A of the housing 51 via an attachment member (not shown). The reflection sheet 65 can be composed of, for example, a silver-enhanced reflection film having a structure in which a silver reflection film, a low refractive index film, and a high refractive index film are sequentially laminated on a sheet base material. The reflection sheet 65 reflects the light emitted from the light emitting diode 41 and the light reflected by the side surface 52B of the housing 51 or the partition plate 43 shown in FIG. Thus, red, green and blue emitted from the plurality of red light emitting diodes 41R for emitting red, the plurality of green light emitting diodes 41G for emitting green, and the plurality of blue light emitting diodes 41B for emitting blue are mixed, High purity white light can be obtained as illumination light. The illumination light passes through the optical function sheet group such as the diffusion plate 61, the diffusion sheet 62, the prism sheet 63, and the polarization conversion sheet 64, and irradiates the color liquid crystal display device 10 from the back side.

  The arrangement state of the light emitting diodes 41R, 41G, and 41B includes, for example, a red light emitting diode 41R that emits red light (for example, a wavelength of 640 nm), a green light emitting diode 41G that emits green light (for example, a wavelength of 530 nm), and a blue light (for example, A plurality of light emitting diode units each including a blue light emitting diode 41B that emits light having a wavelength of 450 nm may be arranged in a horizontal direction and a vertical direction.

  The planar light source unit 42 constituting the planar light source device 40 divides a plurality of light emitting diodes 41 with respect to illumination light of the planar light source unit 42 (more specifically, light emitted from the light emitting diodes 41). It can be obtained by dividing by the plate 43. The luminance in the planar light source unit 42 is not affected by the adjacent planar light source unit 42.

  A drive circuit for driving the color liquid crystal display device 10 and the planar light source device 40 includes a pulse width modulation (PWM) signal generation circuit 71, a duty ratio control circuit 72, a light emitting diode (LED) drive circuit 73, an arithmetic circuit 74, A planar light source device control circuit 70 composed of a storage device (memory) 75 and a liquid crystal display device drive circuit 80 composed of known circuits such as a timing controller 81 are provided. Further, the color liquid crystal display device 10 is provided with a gate driver, a source driver, and the like (not shown) for driving the switching element 32 made of TFT.

Each pixel is a set of three sub-pixels (sub-pixels): a red light-emitting sub-pixel (red light-emitting sub-pixel), a green light-emitting sub-pixel (green light-emitting sub-pixel), and a blue light-emitting sub-pixel (blue light-emitting sub-pixel). It is configured as. In the following description of the embodiments, the luminance control (gradation control) of each of the red light emitting subpixel, the green light emitting subpixel, and the blue light emitting subpixel is 8-bit control, and is performed in 2 to ⁸ steps from 0 to 255. And Therefore, the red light emission control for controlling the light transmittance of the red light emitting subpixel supplied to each of the red light emitting subpixel, the green light emitting subpixel, and the blue light emitting subpixel in each pixel constituting each display area unit 12. The value of the signal is X _R , the value of the green light emission control signal for controlling the light transmittance of the green light emission subpixel is X _G , and the value of the blue light emission control signal for controlling the light transmittance of the blue light emission subpixel is X _B. when a, the value X _R of the red emission control signal takes a value of 2 ⁸ steps of 0 to 255, the value X _G of the green emission control signal also takes a value of 2 ⁸ steps of 0 to 255, the blue light emission control signal The value X _B also takes a value of 2 ⁸ steps from 0 to 255. However, the present invention is not limited to this. For example, 10-bit control can be performed in 2 ¹⁰ stages from 0 to 1023. In this case, if an 8-bit numerical expression is multiplied by, for example, 4 times Good.

The light emission control signals having the values (X _R , X _G , X _B ) of these light emission control signals are sent from the drive circuit to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel that constitute each pixel. Supplied to each of the pixels. More specifically, the timing controller 81 constituting the driving circuit sends the signals to the gate driver and source driver of the color liquid crystal display device 10 by a known method, and the switching elements 32 constituting each subpixel are driven. By applying a desired voltage to the transparent first electrode 24 and the transparent second electrode 34, the light transmittance (also referred to as an aperture ratio) in the liquid crystal cell constituting each subpixel is controlled. Here, the larger the value (X _R , X _G , X _B ) of the light emission control signal, the higher the light transmittance of the subpixel (the aperture ratio of the subpixel) and the higher the luminance value of the subpixel. That is, an image composed of light passing through the sub-pixel (usually a kind of dot) is bright.

A display area composed of pixels arranged in a two-dimensional matrix is divided into P × Q display area units. When this state is expressed by “row” and “column”, Q rows × P It can be said that the display area unit is divided into columns. The display area unit 12 is composed of a plurality of (M × N) pixels. When this state is expressed by “row” and “column”, it is composed of pixels of N rows × M columns. I can say. It is arranged in a two-dimensional matrix and is located at the qth row and the pth column [where q = 1, 2,..., Q and p = 1, 2,. The display area unit and the planar light source unit to be expressed are respectively represented as a display area unit 12 _{(q, p)} and a planar light source unit 42 _{(q, p),} and M ₀ and second along the first direction. ₀ n-along direction, in total M ₀ × n ₀ of pixels, the n-th row, the m-th column [where, n = 1, 2, · · ·, a n, m = 1, 2 ,..., M] and the q-th row and p-th column [where q = 1, 2,..., Q, p = 1, 2,. P] is a pixel existing in the display area unit as PX _{(n, m / q, p)} , red light emitting subpixel is SPX _{R- (n, m / q, p)} , green light emitting subpixel Is _expressed as SPX _{G- (n, m / q, p)} and the blue light-emitting subpixel is expressed as SPX _{B- (n, m / q, p)} . Further, the light transmittance of the red light emitting subpixel SPX _{R- (n, m / q, p)} corresponding to the image signal for controlling the light transmittance in the pixel PX _{(n, m / q, p)} is set. the red emission control signal for controlling LVDS _R- denoted _{(n, m / q, p} ) and a red light emitting control signal _{LVDS R- (n, m / q} , p) the value of the X _R (more specifically , X _{R- (n, m / q, p)} ), the green light emission control signal for controlling the light transmittance of the green light emission subpixel SPX _{G- (n, m / q, p)} is represented by LVDS _{G- ( n, m / q, p),} and the value of the green light emission control signal LVDS _{G- (n, m / q, p)} is represented by X _G (more specifically, X _{G- (n, m / q, p p)} ) and the blue light emission control signal for controlling the light transmittance of the blue light emission sub-pixel SPX _{B- (n, m / q, p)} as LVDS _{B- (n, m / q, p).} The value of the blue light emission control signal LVDS _{B- (n, m / q, p)} is expressed as X _B (more specifically, X _{B- (n, m / q, p)} ). Note that the LVDS (Low Voltage Differential Signaling) system that constitutes the light emission control signal LVDS is a system that converts a parallel signal into a low-voltage differential serial signal and transmits it, reducing noise and unnecessary radiation, and transmitting lines. Can be reduced. However, the signal transmission method is not limited to the LVDS method, and for example, the LVTTL method may be adopted.

  The luminance of the pixels and the luminance of the planar light source unit are controlled for each frame.

Example 1 relates to a driving method of a color liquid crystal display device assembly of the present invention, and more specifically, relates to a driving method according to the first aspect of the present invention. Hereinafter, the driving method of the color liquid crystal display device assembly of Example 1 will be described with reference to the flowcharts of FIGS. 1, 2 and 3. In Example 1 or Examples 2 to 3 to be described later, The maximum value of the red light emission control signal, the green light emission control signal, and the blue light emission control signal supplied to the pixel is assumed to be X _max . Specific values of X _max are shown in Table 2. Further, the relationship between the value of the light emission control signal and the duty period in Example 1 is schematically shown in FIG. 4A, and the relationship between the value of the light emission control signal and the display luminance is schematically shown in FIG. ).

[Table 2]
X _max = 256
a ₀ = 0.6
a ₁ = 0.01
a ₂ = 0.0625 (= 1/16)
a ₃ = 0.0625 (= 1/16)
a _M = 0.1
a _N = 0.1
k ₀ = 0.0625
k ₁ = 0.9375
k ₁ · X _max = 240
k ₀ · X _max = 16
k ₂ = 0.2
α ₀ = 1.00
α ₁ = 0.7
α ₂ = 0.1
D _max = duty period D ₀ = D _{max in which} a value of 714 cd / m ² is obtained in the display area unit in the color liquid crystal display device
In the display area unit in D ₁ = color liquid crystal display device, 500 cd / value of m ² in the display area unit in the duty period D ₂ = color liquid crystal display device to be obtained, the duty period value of 71cd / m ² is obtained

[Step-100]
A red light emission control signal LVDS _{R- (n, m / q, p) for} one frame sent from a known display circuit such as a scan converter, a green light emission control signal LVDS _{G- (n, m / q, p)} , The blue light emission control signal LVDS _{B- (n, m / q, p)} and the clock signal CLK are first input to the planar light source device control circuit 70 and output as they are to the timing controller 81. Entered. Alternatively, these signals are input to the planar light source device control circuit 70 and the timing controller 81. Then, the value X _{R- (n, m / q, p)} of the red light emission control signal LVDS _{R- (n, m / q, p)} for one frame input to the planar light source device control circuit 70, green light emission The value X _{G- (n, m / q, p) of} the control signal LVDS _{G- (n, m / q, p) and} the value X of the blue light emission control signal LVDS _{B- (n, m / q, p) B- (n, m / q, p)} is temporarily stored in a storage device (memory) 75 constituting the planar light source device control circuit 70.

[Step-110]
Then, the arithmetic circuit 74 reads the value of the storage device (memory) 75 to the stored light emission control signal, n = 1, 2, 3 · · ·, in up to N _0, m = 1,2,3 · ... Up to M ₀ , three kinds of light emission control signal values (X _{R- (n, m / q, p)} , X _{G- ( )} supplied to one pixel PX _{(n, m / q, p) n, m / q, p)} and X _{B- (n, m / q, p)} ) are set to Max [X _{R- (n, m / q, p)} , X _{G- (n, m / q, p)} , X _{B- (n, m / q, p)} ], Max [X _{R- (n, m / q, p)} , X _{G- (n, m / q, p)} , X _{B- (n, m / q, p)} ] average value Ave _MAX [X _{R- (n, m / q, p)} , X _{G- (n, m / q, p)} , X _{B- (n, m / q, p)} ] is
Ave _MAX [X _{R- (n, m / q, p)} , X _{G- (n, m / q, p)} , X _{B- (n, m / q, p)} ] ≦ a ₀ · X _max (1 )
(Where a ₀ is a constant, 0.6 in the embodiment)
Find out if you are satisfied. If not satisfied, [Step-160] is executed. If satisfied, the following [Step-120] is executed.

  As described above, when the expression (1) is not satisfied, it is determined that the brightness of the entire screen is bright. Therefore, an operation for giving a sense of brightness particularly to the portion of the image displaying white is unnecessary. On the other hand, when the expression (1) is satisfied, it is determined that the brightness of the entire screen is dark. Therefore, the following [Step-120] is executed in order to give a feeling of brightness particularly to the white image portion.

[Step-120]
That is, the arithmetic circuit 74 again reads the value of the storage device (memory) 75 to the stored light emission control signal, n = 1, 2, 3 · · ·, in up to N _0, m = 1, 2, 3 ..., up to M ₀ , three kinds of light emission control signal values (X _{R− (n, m / q, p)} , X _{G− )} supplied to one pixel PX _{(n, m / q, p) (n, m / q, p)} , X _{B- (n, m / q, p)} )
X _{R- (n, m / q, p)} (= X _R ) ≧ k ₁ · X _max (2-1 ′)
X _{G- (n, m / q, p)} (= X _G ) ≧ k ₁ · X _max (2-2 ′)
X _{B- (n, m / q, p)} (= X _B ) ≧ k ₁ · X _max (2-3 ′)
In other words, if there is a pixel that satisfies the above condition as a white display pixel, in other words, the red light emitting subpixel SPX _{R- (n, m / q, p)} in each pixel PX _{(n, m / q, p)} The red light emission control signal LVDS _{R- (n, m )} supplied to each of the subpixel SPX _{GS (n, m / q, p)} and the blue light emission subpixel SPX _{B- (n, m / q, p). / q, p)} value X _{R- (n, m / q, p)} , green light emission control signal LVDS _{G- (n, m / q, p)} value X _{G- (n, m / q, p)} , And the value X _{B- (n, m / q, p)} of the blue light emission control signal LVDS _{B- (n, m / q, p) is} the value of k ₁ · X _max that is the upper threshold at the same time When the above pixels exist as white display pixels, when the number of white display pixels is NC,
a ₁ × M ₀ × N ₀ ≦ NC ≦ a ₂ × M ₀ × N ₀ (3)
(Where a ₁ and a ₂ are constants)
Find out if you are satisfied. However, k ₁ is a coefficient within a range of 0.90 ≦ k ₁ ≦ 0.99, indicating _{k 1, k 1 · X max} , the specific values of a _1, a ₂ in Table 2.

  As described above, when the number NC of the white display pixels that simultaneously satisfy Expression (2-1 ′), Expression (2-2 ′), and Expression (2-3 ′) does not satisfy Expression (3), white display is performed. Since the pixels are, for example, less than 1% of the total pixels, the area of the screen portion that displays white is judged to be too small, or, for example, exceeds 6.25%, It is determined that the area is too large, and in particular, an operation of giving a sense of brightness to the portion of the image displaying white is unnecessary, and [Step-160] is executed. On the other hand, when Expression (3) is satisfied, the following [Step-130A] to [Step-130D] are executed in order to give the screen portion displaying white a shine. In [Step-120], (m, n) satisfying the expressions (2-1 ′), (2-2 ′), and (2-3 ′) is stored and stored (m , N), the following [Step-130A] to [Step-130D] may be executed.

[Step-130A]
That is, in the arithmetic circuit 74, the value of the light emission control signal stored in the storage device (memory) 75 is read again and, for example, the pixel (n ₁ , m) having the smallest value of n and the smallest value of m. ₁ ) is the starting pixel (n _ini , m _ini ), n _ini is fixed, and starting from _{min i} , the white display pixel is incremented along the first direction (ie, the value of m is incremented by 1) Whether or not the pixel is a white display pixel and the white display pixel is a _M × M ₀ (where a _M is a constant, and in the embodiment, a _M = 0.1). Check if there are more than one.

[Step-130B]
If there is a white display pixel that satisfies the equations (2-1 ′), (2-2 ′), and (2-3 ′) at the same time, starting from n _ini , with m _ini fixed. Along the direction of 2 (ie, incrementing the value of n _min from n _min by one), it is checked whether the pixel is a white display pixel, and the white display pixel is a _N × N ₀ (where a _N is a constant. In the embodiment, it is checked whether a _N = 0.1) or more exist continuously.

[Step-130C]
Then, each display area unit 12 _{(q, p)} (increasing luminance ₎ including white display pixels when there are continuously a _M × M ₀ or more and a _N × N ₀ or more white display pixels. The planar light source unit 42 _{(q, p)} (may be referred to as the luminance-enhanced planar light source unit 42A _{(q, p)} ) corresponding to the display area unit 12A _{(q, p))} Store in the (memory) 75.

[Step-130D]
Next, or alternatively, when there are no more than a _M × M ₀ consecutive white display pixels, or when there are no more than _{N a} × N ₀ consecutive white display pixels, the start pixel (n _ini , n _ini at m _ini ) is incremented by 1, and [Step-130A] to [Step-130C] are repeated. Furthermore, the value of n _ini is more, when it becomes impossible to increment, is incremented by one to m _min, repeated (n _min, m _min) further from the steps -130A] ~ [Step -130C]. Such an operation is performed on all pixels.

If the luminance increase display area unit 12A _{(q, p)} does not exist, [Step-160] is executed.

[Step-140]
Next, the number of brightness increasing planar light source units 42A _{(q, p)} corresponding to the brightness increasing display area unit 12A _{(q, p) (} the brightness increasing planar light source unit 42A _{(q , p)} number) NB is
NB ≦ a ₃ × P × Q (4)
(Here, a ₃ is a constant, and in the embodiment, a ₃ = 0.0625)
Find out if you are satisfied.

  If the expression (4) is not satisfied, [Step-160] is executed. On the other hand, when the expression (4) is satisfied, the following [Step-150] is executed.

[Step-150]
That is, the brightness of the brightness increasing planar light source unit 42A _{(q, p)} corresponding to the brightness increasing display area unit 12A _{(q, p)} is increased. More specifically, the average value of the values of the three types of emission control signals at each pixel constituting the luminance increased display area unit _{12A (q, p) (X} R + X G + X B) / 3 = (X R- ( _{n, m / q, p)} + X _{G- (n, m / q, p)} + X _{B- (n, m / q, p)} ) / 3
_Is obtained in all the pixels constituting the luminance increase display area unit 12A _{(q, p),} and the maximum of the average values of the three types of light emission control signals is X _{ave_max} .
_{X (U) max = X ave_max} + k 0 · X max (5)
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, In order to obtain luminance (display luminance), the luminance of the luminance increasing planar light source unit 42A _{(q, p)} corresponding to the luminance increasing display region unit 12A _{(q, p)} is increased. However, k ₀ is a coefficient within a range of 0.06 ≦ k ₀ ≦ 0.3, and specific values are shown in Table 2. If the value of the first term on the right side of equation (5) is an integer and does not become an integer when divided by 3, the first decimal place is rounded off. The value of the second term on the right side of Equation (5) is also an integer, and the coefficient k ₀ is selected so that the value of k ₀ · X _max is an integer.

Specifically, for example,
X _{R- (n, m / q, p)} = 240
X _{G- (n, m / q, p)} = 255
X _{B- (n, m / q, p)} = 250
In this case, the value of X (U) _max is calculated in the arithmetic circuit 74 from the equation (5). That is,
X (U) _max = (240 + 255 + 250) / 3 + 16
= 264
It becomes. Therefore, the red light emission control signal, the green light emission control signal, and the blue light emission control signal having values corresponding to X _R = X _G = X _B = 264 are the red light emission subpixel, the green light emission subpixel, and the blue light emission. The luminance increase planar light source unit 42A _{(q, p)} corresponding to the luminance increase display area unit 12A _{(q, p)} is obtained so that the luminance (display luminance) of the pixel when it is assumed that the pixel is supplied to the subpixel is obtained. Increase brightness.

here,
_{X (U) max = (1} + k 0) X max (6)
= 272
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, The duty period D _{0 at which} brightness (display brightness) can be obtained is given by assuming that the maximum duty period is D _max .
D ₀ = α ₀ · D _max (7)
It is. However, α ₀ is a coefficient within a range of 0.95 ≦ α ₀ ≦ 1.0, and specific values are shown in Table 2.

Then, based on a value such as X _R = X _G = X _B = 264 obtained by the arithmetic circuit 74, the duty ratio control circuit 72 uses the light emitting diode 41R ₍ constituting the luminance increasing planar light source unit 42A _{(q, p).} The duty period D [X (U) _max ] in the pulse width modulation control of _{q, p)} , 41G _{(q, p)} , 41B _{(q, p)} is determined. This state is indicated by a solid line in FIG. Then, a signal corresponding to the duty period D [X (U) _max ] is sent to the LED control circuit 73, and the PWM signal generated in the PWM signal generation circuit 71 is sent to the LED control circuit 73. in 73, PWM signal the duty period D [X (U) _max] based on the corresponding signal to the LED drive signal PWM _{(q, p)} generates a LED driving signal PWM according _{(q, p),} the luminance increases The light is sent to the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the planar light source unit 42A _{(q, p)} . As a result, the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the luminance increasing planar light source unit 42A _{(q, p)} are set at a predetermined time in one frame time. The (p, q) th luminance increase display area unit 12A _{(q, p)} is illuminated at a predetermined illuminance. The state of display luminance thus obtained is shown by a solid line in FIG.

On the other hand, in the brightness enhancement planar light source unit 42A _{(q, p)} (sometimes referred to as a non-luminance increases planar light source unit 42B _{(q, p))} surface light source unit 42 other than _{(q, p)} is The same operation as in [Step-160] below is performed.

[Step-160]
That is, when it is determined in [Step-110], [Step-120], [Step-130A] to [Step-130D], or [Step-140] that [Step-160] should be executed. In addition, in the non-luminance increasing planar light source unit 42B _{(q, p)} other than the luminance increasing planar light source unit 42A _{(q, p)} , the operation of the planar light source unit is assumed to be a normal operation. The planar light source unit driven in [Step-160] or [Step-210] described later is generally referred to as a non-luminance increasing planar light source unit 42B _{(q, p)} . Specifically, in the duty ratio control circuit 72 that has received an instruction to that effect from the arithmetic circuit 74 _, the luminance L _{(q, p) in} the non-luminance increasing planar light source unit 42B _{(q, p)} is constant. _In the pulse width modulation control of the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the non-luminance increasing planar light source unit 42B _{(q, p)} so as to be _Cons The duty period D ₁ (= α ₁ · D _max , specific values are shown in Table 2) is determined. This state is indicated by a dotted line in FIG. Then, a signal corresponding to the duty period D ₁ is sent to the LED control circuit 73, and at the same time, the PWM signal generated in the PWM signal generation circuit 71 is sent to the LED control circuit 73. duty period based on a signal corresponding to the D ₁ LED drive signal PWM _{(q, p)} generates, according LED drive signal PWM _{(q, p)} and the non-luminance increased surface light source unit 42B _{(q, p)} The light-emitting diodes 41R _{(q, p)} , 41G _{(q, p)} and 41B _{(q, p)} are sent out. As a result, the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the non-luminance increasing planar light source unit 42B _{(q, p)} It is lit only for a period of time, and the non-intensity increasing display area unit 12B _{(q, p)} is illuminated at a predetermined illuminance. The state of display luminance thus obtained is indicated by a dotted line in FIG.

Note that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₁ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. When the maximum duty period is set to D _max , the duty period D _{1 at which} the brightness (display brightness) of the pixel when assuming that
D ₁ = α ₁ · D _max (8)
Satisfied. However, α ₁ is a coefficient within a range of 0.3 ≦ α ₁ ≦ 0.8, and specific values are as shown in Table 2.

  Thus, one frame image display is performed. The operation of the liquid crystal display device 10 and the operation of the planar light source device 40 within one frame are synchronized.

As described in [Step-100], the red light emission control signal LVDS _{R- (n, m / q, p)} and the green light emission control signal LVDS for one frame sent from a known display circuit such as a scan converter. _The timing controller _{G- (n, m / q, p)} and the blue light emission control signal LVDS _{B- (n, m / q, p)} and the clock signal CLK are not changed or corrected at all. 81. Therefore, in the driving method of the color liquid crystal display device assembly of the present invention, even if the driving method is executed, the light transmittance of the subpixel (the aperture ratio of the subpixel) itself is changed, corrected, or the like. Never happen.

The coefficient k ₀ in k ₀ · X _max in the second term on the right-hand side of equation (5) is set to be equal to or higher than the first order or second order of the average value [(X _R + X _G + X _B ) / 3 = X _{ave_max} ] of the light emission control signal. It may be a function _{F_ k0} (X ave_max) which is expressed by a polynomial. For example, as a function F_ _{k0 (X} ave_max), 1 linear function of X _{Ave_max,} for example,
_{F_ k0 (X ave_max) = k} 0 · X ave_max / {(1-k 1) · X max)} -k 0 · k 1 / (1-k 1)
Can be illustrated. FIG. 5A schematically shows the relationship between the value of the light emission control signal and the duty period in the modification of the first embodiment, and the relationship between the value of the light emission control signal and the display luminance is schematically shown in FIG. Shown in (B). The function _{F_ k0} (X ave_max), as described above, is 0 when _{X ave_max = k 1 · X max} , which is a linear function of the k ₀ when _X ave_max = X _max.

Contrast ratio in color liquid crystal display device (luminance ratio of all black display part and all white display part not including external light reflection on the screen surface of color liquid crystal display device) maximizes the light transmittance of each pixel It is the ratio between the light transmittance in the case and the light transmittance in the minimum case. A current color liquid crystal display device is said to be an excellent color liquid crystal display device if a contrast ratio of about 1000 to 1 can be achieved. By the way, in order to further improve the contrast ratio, it is necessary to increase the luminance level of the all-white display portion. For this purpose, as schematically shown in FIG. 14, there is a method of increasing the luminance of the planar light source device. Conceivable. However, in such a method, the all black display portion is also brightened, and a so-called phenomenon of “black floating” occurs, which is inferior in terms of the naturalness of the display screen as compared with other types of display devices. In addition, in the cathode ray tube (CRT), automatic brightness restriction (ABL) control is performed, and only the white display portion raises the luminance level, thereby achieving white brightness peculiar to the cathode ray tube. Specifically, the brightness of the white display portion is, for example, 500 cd / m ^2, and the brightness of other portions is 300 cd / m ² . However, in the case of the color liquid crystal display device, a specific method for raising the luminance level of the display area portion including the white display portion to be higher than the luminance level of the other display region portions is as long as the present inventors have investigated. Then it is not known.

In the driving method of the color liquid crystal display device assembly of Example 1, a bias (k ₀ · X _max ) was added to the average value of the three light emission control signal values (X _R , X _G , X _B ). Increase the brightness of the brightness increasing planar light source unit corresponding to the brightness increasing display area unit so that the brightness of the pixel when it is assumed that a light emission control signal having a signal value corresponding to the value is supplied to each sub-pixel Therefore, the luminance level of the luminance increase display area unit including the white display pixel can be increased more than the luminance levels of the other display area units, and white brightness similar to that of the cathode ray tube can be achieved. Can do.

  Example 2 is a modification of Example 1 and relates to a driving method according to the second mode of the present invention. Hereinafter, a driving method of the color liquid crystal display device assembly of Example 2 will be described. The relationship between the value of the light emission control signal and the duty period in Example 2 is schematically shown in FIG. 6A, and the relationship between the value of the light emission control signal and the display luminance is schematically shown in FIG. ).

6 (A) and (B) solid lines and dotted lines, or FIG. 7 (A) and (B) solid lines and dotted lines described later, and FIG. 8 (A) and (B) solid lines and dotted lines. The meanings of the solid lines and dotted lines in FIGS. 9A and 9B are the same as the meanings of the solid lines and dotted lines in FIGS. In addition, the values of various parameters including X _max in Example 2 or Example 3 described later are as shown in Table 2.

[Step-200]
First, the same steps as [Step-100] to [Step-150] of the first embodiment are executed.

[Step-210]
This step is similar to [Step-160] of the first embodiment, but is different from [Step-160] of the first embodiment. That is, when it is determined in [Step-110], [Step-120], [Step-130A] to [Step-130D], or [Step-140] that [Step-160] should be executed. In addition, in the non-brightness increasing planar light source unit 42B _{(q, p)} other than the brightness increasing planar light source unit 42A _{(q, p)} , each non-brightness increasing display area unit 12B _{(q, p)} is changed. Red light-emitting subpixel SPX _{R- (n, m / q, p)} , green light-emitting subpixel SPX _{G- (n, m / q, p)} in all pixels PX _{(n, m / q, p)} constituting The red light emission control signal LVDS _{R- (n, m / q, p)} (signal value: X _{R- (n, m )} supplied to the blue light emission subpixel SPX _{B- (n, m / q, p) / q, p)} ), green emission control signal LVDS _{G- (n, m / q, p)} (signal value: X _{G- (n, m / q, p)} ), and blue emission control signal LVDS _{B -(n, m / q, p)} (signal value: X _{B- (n, m / q, p)} ) maximum value X ′ (U) _max is determined in the arithmetic circuit 74.

A red light emission control signal LVDS _{R- (n, m / q, p)} having a value corresponding to X ′ (U) _max , a green light emission control signal LVDS _{G- (n, m / q, p)} , and , Blue light emission control signal LVDS _{B- (n, m / q, p)} is red light emission subpixel SPX _{R- (n, m / q, p)} , green light emission subpixel SPX _{G- (n, m / q, p p)} and the non-intensity increasing display region unit 12B ₍ display luminance) so that the luminance (display luminance) of the pixel when it is assumed that it is supplied to the blue light emitting subpixel SPX _{B- (n, m / q, p} ) is obtained. _q, to increase or decrease the luminance (light source unit luminance) of the non-luminance increases planar light source unit 42B that corresponds to _{p) (q, p).}

That is, in the duty ratio control circuit 72 that has received information on X ′ (U) _max from the arithmetic circuit 74, the above-described display is performed by the luminance L _{(q, p) in} the non-luminance increasing planar light source unit 42B _{(q, p)} . Pulse width modulation control of the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the non-luminance increasing planar light source unit 42B _{(q, p)} so as to obtain luminance The duty period D is determined. Although this state is indicated by a dotted line in FIG. 6A, unlike the first embodiment, the duty period D is not a constant value but is a function of X ′ (U) _max . Then, a signal corresponding to the duty period D is sent to the LED control circuit 73, and at the same time, the PWM signal generated in the PWM signal generation circuit 71 is sent to the LED control circuit 73. In the LED control circuit 73, the PWM signal and An LED drive signal PWM _{(q, p)} is generated based on a signal corresponding to the duty period D, and the LED drive signal PWM _{(q, p)} is configured in the non-luminance increasing planar light source unit 42B _{(q, p)} . The light-emitting diodes 41R _{(q, p)} , 41G _{(q, p)} and 41B _{(q, p)} are transmitted. As a result, the light emitting diodes 41R _{(q, p)} , 41G _{(q, p)} , 41B _{(q, p)} constituting the non-luminance increasing planar light source unit 42B _{(q, p)} It is lit for a period of time, and illuminates the (p, q) -th non-luminance increasing display area unit 12B _{(q, p)} at a predetermined illuminance. The state of display luminance thus obtained is indicated by a dotted line in FIG.

For example,
X _{R- (n, m / q, p)} ) = 110
X _{G- (n, m / q, p)} ) = 150
X _{B- (n, m / q, p)} ) = 50
If it is,
X ′ (U) _max = 150
It becomes. Therefore, a red light emission control signal LVDS _{R- (n, m / q, p)} having a value corresponding to X ′ (U) _max = 150, a green light emission control signal LVDS _{G- (n, m / q, p)} , And the blue light emission control signal LVDS _{B- (n, m / q, p)} is the red light emission subpixel SPX _{R- (n, m / q, p)} and the green light emission subpixel SPX _{G- (n, m / q). , p)} and the non-intensity increasing display region unit 12B so that the luminance (display luminance) of the pixel when it is assumed that it is supplied to the blue light emitting subpixel SPX _{B- (n, m / q, p} ) is obtained. _{(q, p)} to increase or decrease the luminance (light source unit luminance) of the non-luminance increases planar light source unit 42B corresponding to the _{(q, p).}

Even in the second embodiment, the coefficient k ₀ in k ₀ · X _max of the second term on the right side of the equation (5) is the average value (X _{ave — max} ) of the light emission control signal as described in the first embodiment. primary or function to be F_ expressed by a quadratic or more polynomial _k0 (X _{ave_max)} and can be. FIG. 7A schematically shows the relationship between the value of the light emission control signal and the duty period in the modification of Example 2, and the relationship between the value of the light emission control signal and the display luminance is schematically shown in FIG. Shown in B).

The driving method of the color liquid crystal display device assembly of Example 2 is based on the same method as the driving method of the color liquid crystal display device assembly of Example 1, and produces white brightness similar to that of the cathode ray tube. A light emission control signal having a value corresponding to the maximum value X ′ (U) _max among the values (X _R , X _G , X _B ) of the light emission control signal supplied to the sub-pixels can be achieved. Since the brightness of the non-brightness increasing planar light source unit corresponding to the non-brightness increasing display area unit is increased / decreased so that the brightness of the pixel when assumed to be supplied to each subpixel is obtained, the contrast ratio is further improved. It becomes possible.

The third embodiment is a modification of the second embodiment. In Example 2, the duty period D is one, X '(U) is a function of the _max, moreover, X' (U) red light emitting control signal having a value corresponding to the _max, the green light emission control signal and,, The non-luminance corresponding to the non-luminance increase display area unit so that the luminance of the pixel when it is assumed that the blue emission control signal is supplied to the red emission sub-pixel, the green emission sub-pixel, and the blue emission sub-pixel The brightness of the increased planar light source unit was increased or decreased.

On the other hand, Example 3 corresponds to the non-luminance increasing planar light source unit 42B _{(q, p)} other than the luminance increasing planar light source unit 42A _{(q, p)} in [Step-210] of Example 2. In the non-intensity increasing display area unit 12B _{(q, p)} ,
X ′ (U) _max ≦ k ₂ · X _max (9)
The red light emission control signal, the green light emission control signal, and the blue light emission control signal having values corresponding to k ₂ · X _max are _supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. The luminance of the non-luminance increasing planar light source unit 42B _{(q, p)} corresponding to the non-luminance increasing display region unit 12B _{(q, p)} so that the luminance (display luminance) of the pixel when it is assumed to be supplied can be obtained. (Light source unit brightness) is controlled. However, k ₂ is a coefficient within the range of 0.1 ≦ k ₂ ≦ 0.2, and specific values are as shown in Table 2. This state is indicated by a dotted line in FIG.

Further, a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₂ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. When the maximum duty period is set to D _max , the duty period D _{2 in which} the luminance (display luminance) of the pixel when assuming that
D ₂ = α ₂ · D _max (10)
Satisfied. However, α ₂ is a coefficient within a range of 0.01 ≦ α ₂ ≦ 0.2, and specific values are as shown in Table 2. This state is indicated by a dotted line in FIG.

Even in the third embodiment, the coefficient k ₀ in k ₀ · X _max of the second term on the right-hand side of Expression (5) is the average value (X _{ave — max} ) of the light emission control signal as described in the first embodiment. primary or function to be F_ expressed by a quadratic or more polynomial _k0 (X _{ave_max)} and can be. FIG. 9A schematically shows the relationship between the value of the light emission control signal and the duty period in the modification of Example 3, and the relationship between the value of the light emission control signal and the display luminance is schematically shown in FIG. Shown in B).

  As mentioned above, although this invention was demonstrated based on the preferable Example, this invention is not limited to these Examples. The configurations and structures of the transmissive color liquid crystal display device, the planar light source device, and the color liquid crystal display device assembly described in the embodiments are examples, and members, materials, and the like constituting these are also examples, and may be changed as appropriate. can do. The light emission state of the surface light source device is monitored by an optical sensor, the temperature of the light emitting diode is monitored by a temperature sensor, and the result is fed back to the light emitting diode (LED) drive circuit 73 to compensate the luminance of the surface light source unit. (Correction) and temperature control may be performed.

In some cases, instead of formula (2-1), formula (2-2), and formula (2-3),
(X _R + X _G + X _B ) / 3 ≧ k ₁ · X _max (11)
(Where k ₁ is a coefficient within the range of 0.90 ≦ k ₁ ≦ 0.99)
When a pixel that satisfies the above condition exists as a white display pixel, when the number of the white display pixels is NC,
a ₁ × M ₀ × N ₀ ≦ NC ≦ a ₂ × M ₀ × N ₀ (3)
(Where a ₁ and a ₂ are constants)
A method of driving the color liquid crystal display device assembly, such as checking whether or not the above condition is satisfied, may be employed. Furthermore, the routine described in [Step-130A] to [Step-130D] is also an example, and can be changed as appropriate.

As shown in a conceptual diagram in FIG. 13, a light emitting diode assembly in which the light extraction lens 100 is attached to the light emitting diode 41 is used as a light source, and light emitted from the light emitting diode 41 is reflected on the top surface 103 of the light extraction lens 100. A two-dimensional direction emission configuration in which the light is totally reflected and emitted mainly in the horizontal direction of the light extraction lens 100 may be employed. In FIG. 13, reference numeral 101 indicates the bottom surface of the light extraction lens 100, and reference numeral 102 indicates the side surface of the light extraction lens 100. Examples of the material constituting the light extraction lens include materials used for eyeglass lenses, a product name Prestige (refractive index: 1.74) of Seiko Optical Products Co., Ltd., and a product name ULTIMAX of Showa Optical Co., Ltd. There are plastic materials having a high refractive index, such as V AS 1.74 (refractive index: 1.74) and Nikon Essilol's trade name NL5-AS (refractive index: 1.74). Optical glass such as glass material NBFD11 (refractive index n ₁ : 1.78), M-NBFD82 (refractive index n ₁ : 1.81), M-LAF81 (refractive index n ₁ = 1.731) manufactured by HOYA Corporation. Inorganic dielectric materials such as KTiOPO ₄ (refractive index n ₁ : 1.78) and lithium niobate [LiNbO ₃ ] (refractive index n ₁ : 2.23) can be mentioned.

FIG. 1 is a flowchart for explaining a driving method of the color liquid crystal display device assembly according to the first embodiment. FIG. 2 is a flowchart for explaining the driving method of the color liquid crystal display device assembly according to the first embodiment, following FIG. FIG. 3 is a flowchart for explaining the driving method of the color liquid crystal display device assembly of the embodiment 1 following FIG. FIG. 4A is a diagram schematically illustrating the relationship between the value of the light emission control signal and the duty period in Example 1, and FIG. 4B is a diagram illustrating the value of the light emission control signal and the display luminance. It is a figure which shows a relationship typically. FIG. 5A is a diagram schematically showing the relationship between the value of the light emission control signal and the duty period in the modification of Example 1, and FIG. 5B is the value and display of the light emission control signal. It is a figure which shows typically the relationship with a brightness | luminance. 6A is a diagram schematically illustrating the relationship between the value of the light emission control signal and the duty period in Example 2, and FIG. 6B is a diagram illustrating the value of the light emission control signal and the display luminance. It is a figure which shows a relationship typically. FIG. 7A is a diagram schematically illustrating the relationship between the value of the light emission control signal and the duty period in the modification of the second embodiment, and FIG. 7B is a diagram illustrating the value and display of the light emission control signal. It is a figure which shows typically the relationship with a brightness | luminance. FIG. 8A schematically shows the relationship between the value of the light emission control signal and the duty period in Example 3, and FIG. 8B shows the relationship between the value of the light emission control signal and the display luminance. It is a figure which shows a relationship typically. FIG. 9A is a diagram schematically showing the relationship between the value of the light emission control signal and the duty period in the modification of Example 3, and FIG. 9B is the value and display of the light emission control signal. It is a figure which shows typically the relationship with a brightness | luminance. FIG. 10 is a conceptual diagram of a color liquid crystal display device assembly including a color liquid crystal display device, a planar light source device, and a drive circuit suitable for use in each embodiment. FIG. 11 is a schematic partial sectional view of a color liquid crystal display device assembly. 12A is a diagram schematically illustrating the arrangement and arrangement of light emitting diodes and the like in the planar light source device of each embodiment, and FIG. 12B is a planar light source device of each embodiment. FIG. 3 is a schematic partial cross-sectional view of a color liquid crystal display device assembly. FIG. 13 is a schematic cross-sectional view of the light extraction lens disclosed on page 128 of Nikkei Electronics No. 889, December 20, 2004. FIG. 14 is a graph schematically showing the relationship between the light emission control signal level and the display luminance which is the luminance of the pixel in the conventional color liquid crystal display device assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Color liquid crystal display device, 11 ... Display area, 12, 12A, 12B ... Display area unit, 13 ... Liquid crystal material, 20 ... Front panel, 21 ... 1st Substrate, 22 ... color filter, 23 ... overcoat layer, 24 ... transparent first electrode, 25 ... alignment film, 26 ... polarizing film, 30 ... rear panel, 31. ..Second substrate 32 ... Switching element 34 ... Transparent second electrode 35 ... Alignment film 36 ... Polarization film 37 ... Insulating layer 40 ... Surface shape Light source device, 41, 41R, 41G, 41B ... light emitting diode, 42, 42A, 42B ... planar light source unit, 43 ... partition plate, 51 ... housing, 52A ... housing Bottom surface, 52B ... side surface of casing, 53 ... outer frame 54 ... inner frame, 55A, 55B ... spacer, 56 ... guide member, 57 ... bracket member, 61 ... diffusion plate, 62 ... diffusion sheet, 63 ... prism sheet 64... Polarization conversion sheet, 65... Reflection sheet, 70... Planar light source device control circuit, 71... Pulse width modulation (PWM) signal generation circuit, 72. 73... Light emitting diode drive circuit, 74... Arithmetic circuit, 75... Storage device (memory), 80.

Claims (9)

(A) A display area in which a total of M ₀ × N ₀ pixels, M ₀ along the first direction and N ₀ along the second direction, are arranged in a two-dimensional matrix is P × Q. A color liquid crystal display device that is divided into a plurality of display area units, and each display area unit includes a plurality of pixels;
(B) P × Q planar light source units corresponding to P × Q display area units, and each planar light source unit illuminates the display area unit corresponding to the planar light source unit from the back side. Light source device, and
(C) a driving circuit for driving the color liquid crystal display device and the planar light source device;
With
Each pixel is composed of a set of three subpixels, a red light emitting subpixel, a green light emitting subpixel, and a blue light emitting subpixel,
A red light emission control signal for controlling the light transmittance of the red light emission subpixel, a green light emission subpixel, a green light emission subpixel, and a green light emission subpixel, respectively, from the drive circuit A method for driving a color liquid crystal display device assembly, which supplies a green light emission control signal for controlling light transmittance and a blue light emission control signal for controlling light transmittance of a blue light emitting subpixel,
When the maximum value of the red light emission control signal, the green light emission control signal, and the blue light emission control signal supplied to the pixel is X _max ,
(A) The value of the red light emission control signal supplied to each of the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel in each pixel constituting the color liquid crystal display device is represented by X _R , the green light emission control signal. The maximum value among the three types of light emission control signal values (X _R , X _G , X _B ) supplied to one pixel is X _G and the value of the blue light emission control signal is X _B. Is represented by Max [X _R , X _G , X _B ], the average value Ave _MAX [X _R , X _G , X _B ] of Max [X _R , X _G , X _B ] in all pixels is
Ave _MAX [X _R , X _G , X _B ] ≦ a ₀ · X _max (1)
(Where a ₀ is a constant)
Is satisfied, and if the expression (1) is satisfied,
(B) The values (X _R , X _G , X _B ) of the three types of light emission control signals supplied to one pixel are:
X _R ≧ k ₁ · X _max (2-1)
X _G ≧ k ₁ · X _max (2-2)
X _B ≧ k ₁ · X _max (2-3)
(Where k ₁ is a coefficient within the range of 0.90 ≦ k ₁ ≦ 0.99)
When a pixel that satisfies the above condition exists as a white display pixel, when the number of the white display pixels is NC,
a ₁ × M ₀ × N ₀ ≦ NC ≦ a ₂ × M ₀ × N ₀ (3)
(Where a ₁ and a ₂ are constants)
Is satisfied, and if the expression (3) is satisfied,
(C) It is examined whether or not there are a _M × M ₀ (a _M is a constant) or more white display pixels continuously along the first direction, and the white display pixels are the second ones. It is checked whether or not a _N × N ₀ (a _N is a constant) continuously exist along the direction, and if there are, display area units including these white display pixels are displayed with increased brightness. An area unit, then
(D) When the number of planar light source units corresponding to the luminance increase display area unit is NB,
NB ≦ a ₃ × P × Q (4)
(Where a ₃ is a constant)
Is satisfied, and if the expression (4) is satisfied,
(E) Increasing the luminance of the planar light source unit corresponding to the luminance increase display area unit;
A driving method of a color liquid crystal display device assembly comprising the steps. When the luminance of the planar light source unit corresponding to the luminance increase display area unit is increased in the step (E), the average value of the three types of light emission control signals in each pixel constituting the luminance increase display area unit ( X _R + X _G + X _B ) / 3 is obtained for all the pixels constituting the luminance increase display area unit, and the maximum of the average values of the three types of light emission control signals is X _{ave —} max.
_{X (U) max = X ave_max} + k 0 · X max (5)
(Where k ₀ is a coefficient within the range of 0.06 ≦ k ₀ ≦ 0.3)
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, 2. The method of driving a color liquid crystal display device assembly according to claim 1, wherein the luminance of the planar light source unit corresponding to the luminance increase display area unit is increased in the step (E) so that the luminance is obtained. . The planar light source unit consists of light emitting diodes,
3. The color liquid crystal display device assembly according to claim 2, wherein the luminance of the planar light source unit is increased or decreased by controlling the duty period in the pulse width modulation control of the light emitting diodes constituting the planar light source unit. Driving method. _{X (U) max = (1} + k 0) X max (6)
Assuming that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel, The duty period D _{0 at which} brightness can be obtained is when the maximum duty period is D _max .
D ₀ = α ₀ · D _max (7)
(However, α ₀ is a coefficient within the range of 0.95 ≦ α ₀ ≦ 1.0)
The method for driving a color liquid crystal display device assembly according to claim 3, wherein: Assume that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₁ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. When the maximum duty period is D _max , the duty period D ₁ for obtaining the brightness of the pixel at the time is
D ₁ = α ₁ · D _max (8)
(However, α ₁ is a coefficient within the range of 0.3 ≦ α ₁ ≦ 0.8)
The method of driving a color liquid crystal display device assembly according to claim 3, wherein: In the non-luminance increasing display area unit corresponding to the planar light source unit other than the luminance increasing planar light source unit in the step (E), the red light emitting sub-pixels in all the pixels constituting each non-luminance increasing display area unit, green When the maximum value among the red light emission control signal, the green light emission control signal, and the blue light emission control signal supplied to the light emission subpixel and the blue light emission subpixel is X ′ (U) _max , X ′ ( U) When it is assumed that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. 2. The color liquid crystal display device assembly according to claim 1, wherein the brightness of the planar light source unit corresponding to the non-brightness increasing display area unit is increased or decreased so that the brightness of the pixel is obtained. Driving method. The planar light source unit consists of light emitting diodes,
7. The color liquid crystal display device assembly according to claim 6, wherein the luminance of the planar light source unit is increased or decreased by controlling the duty period in the pulse width modulation control of the light emitting diodes constituting the planar light source unit. Driving method. In the non-brightness increasing display area unit corresponding to the planar light source unit other than the luminance increasing planar light source unit in the step (E),
X ′ (U) _max ≦ k ₂ · X _max (9)
(Where k ₂ is a coefficient within the range of 0.1 ≦ k ₂ ≦ 0.2)
The red light emission control signal, the green light emission control signal, and the blue light emission control signal having values corresponding to k ₂ · X _max are _supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. 8. The color liquid crystal display device set according to claim 7, wherein the luminance of the planar light source unit corresponding to the non-luminance increasing display region unit is controlled so that the luminance of the pixel when it is assumed that the pixel is supplied is obtained. Solid driving method. Assume that a red light emission control signal, a green light emission control signal, and a blue light emission control signal having values corresponding to k ₂ · X _max are supplied to the red light emission subpixel, the green light emission subpixel, and the blue light emission subpixel. The duty period D ₂ for obtaining the brightness of the pixel when the maximum duty period is D _max is as follows:
D ₂ = α ₂ · D _max (10)
(However, α ₂ is a coefficient within the range of 0.01 ≦ α ₂ ≦ 0.2)
The method for driving a color liquid crystal display device assembly according to claim 8, wherein:

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