TWI401656B - Backlight system display method and apparatus, and backlight system - Google Patents

Description

Backlight system display method and device and backlight system

The present invention relates to a backlight system display method and device and a backlight system.

A display device using a backlight is configured to display an image by introducing light emitted from the backlight into a transmissive display panel, modulating the light according to an image to be displayed, and generating the modulated light. Export the front of the panel.

Patent Document 1 describes a liquid crystal display device which belongs to this type and realizes a structure using a backlight to eliminate the necessity of using a color filter in a liquid crystal panel. The purpose of this device is to use a linear source of R (red), G (green), and R (blue) along the scan line on the screen to form the backlight and provide a color display that is repeated in a 1-frame period. The top to bottom of the screen sequentially selects (addresses) a scan line on the display panel: and writes any monochrome image signal corresponding to the selected scan line to the pixel of the scan line, and simultaneously writes A linear light source corresponding to the color of the image signal and the position of the selected scan line is turned on, and the color to be displayed is changed for each frame.

Further, Patent Document 2 discloses a liquid crystal display device which is also of the same type and eliminates the necessity of providing any color filter in the display panel. This device is designed to enable high speed drive.

[Patent Document 1] Japanese Laid-Open Patent Application No. 10997/98 (see, in particular, paragraphs [0001] and [0016] to [0019]) [Patent Document 2] Japanese Patent No. 3280307 (see, in particular, [0002] to [0010] and [0019] to [0059]

technical problem

However, in the display device described in Patent Document 1, if the monochrome address operation for the frame image and the corresponding switching of the backlight illumination color are not completely performed from the top to the bottom of the screen, the next step is not performed for the next color. The address operation of the color frame image and the corresponding switching of the color of the backlight illumination. Since the period of full color switching is as long as a frame, it is prone to flicker. Moreover, since the old color is mainly displayed on a large area of one of the screens before starting to display the new color, the synthesis (mixing) of the color is relatively coarse. Therefore, for example, when the user blinks or sees the screen when suddenly changing his line of sight or when the image to be displayed includes a component having a large moving width per unit time, the color synthesis effect does not work, and it often causes In one case, the user can only clearly recognize image information of one or two colors at the same time (ie, so-called color separation).

In addition, the device described in Patent Document 2 is designed to realize high-speed pixel driving using a low-response liquid crystal material, but only images of up to three colors can be displayed in the display region, which is not sufficient for color separation. Countermeasure.

Technical solution (purpose)

The present invention has been made in view of such problems, and an object thereof is to provide a display method and device capable of avoiding the above-described color separation and a backlight system adapted to the display method and device.

Another object of the present invention is to provide a display method and device and backlight system that improve the efficiency of use of light from a backlight and the aperture ratio of the display panel without any problems such as color separation.

In order to achieve the above object, a first aspect of the present invention is a display method using a transmissive matrix display panel, wherein a plurality of column electrodes and a plurality of row electrodes are arranged and driven according to signals applied to the columns and row electrodes a pixel, wherein: a backlight system is used to individually generate at least first, second, and third colors of strip-shaped spotlights formed along the column electrodes, and the spotlights are used as a backlight to illuminate the display panel while Moving the spotlights in a direction perpendicular to a longitudinal extension direction of one of the column electrodes on a display area of the display panel, wherein each of the spotlights is from one side of the display area to the side The other side is repeatedly moved, and in the display area, there are at least one of the first to third spotlights of the first to third colors and one of the at least one color selected from the first to third colors Four spotlights; according to the movement of the spotlights, for each of the spotlights, repeating the address operation in the display area to select and correspond to the following positions a related column electrode: a specific illumination position within one of the illumination ranges of the spotlight or a specific boundary adjacent position outside the illumination range of the spotlight; the address operation should be performed, and the pixel of the color of the spotlight is utilized Information signals are provided to the row electrodes that illuminate the pixel locations or pre-illumination associated with the selected column electrodes to sequentially drive the pixels; and define a virtual form for forming a spotlight sequence to be presented in the display region a region in which the number of spotlights presented is greater than the number of spotlights to be presented in the display area and the first to third colors are assigned to the spotlights, and from the virtual area in the virtual area Repeatingly moving each of the spotlights from an opening to an end thereof, the virtual area having a defined range of spotlights to be presented in the display area, the spotlights in the effective range being used as the first to the first Four spotlights.

With this aspect, the necessity of providing any color filter in the display panel can be eliminated, and the aperture ratio and light transmission factor can be improved, that is, the efficiency of use of the rear light from the backlight can be improved. Further, the display panel does not have to have sub-pixels corresponding to the first to third colors and may be configured only by the main pixels, and thus the number of row electrodes required for this configuration has only the number of configurations having sub-pixels 1/3 of the sub-pixel structure helps to simplify the display panel structure and reduce manufacturing costs. a primary pixel having one of the display pixels of the first to third colors, and thus reducing the primary pixel by applying a sub-pixel level fine formation process that is conventionally feasible The size can also achieve a higher resolution. In the display area, at least four spotlights are simultaneously present and the pixel information is effectively displayed, thereby enabling the color synthesis effect to function well, avoiding the above-mentioned color separation, and providing more when displaying moving images. advantage. Moreover, the use of the virtual area not only increases the number of spotlights appearing on the screen, but also complicates the moving pattern of the spotlights and thus further increases the effect of preventing color separation.

In this regard, a black dot or other point for preventing light transmission may be formed between adjacent spotlights. This prevents mixed color portions that may occur in areas where the spotlights overlap each other, and avoids the display of unwanted light generated by mixing the color portions. Such a region for preventing light transmission has a small space and also has temporal variability, so that it does not have any substantial influence on the image to be displayed.

In addition, a synchronized timing control can be applied to the movement and addressing operations of the spotlights. This ensures that the spotlights move on the backlight side and the addressing operation is performed on the panel side.

Preferably, after the addressing operation is completed and the pixels are driven according to the pixel information signals, the spotlight is moved by changing a color of the illumination light for pixels associated with the at least one selected column electrode. The addressing operation and the application of pixel information, that is, the writing of pixels, generally assumes a transient state of one pixel regardless of which type of pixel driving active element or pixel driving structure is applied. If such a transient condition may exist during a period, the pixel information will not be properly displayed even if the pixels are illuminated by the corresponding spotlight during the period. According to this form, the pixels of a selected column electrode are illuminated after the pixel writing operation, and thus the spotlight can be appropriately modulated in accordance with appropriate pixel information. In addition, if the backlight system turns off the illumination light of the pixels associated with the selected column electrode during the addressing operation and the process of providing the pixel information signal, the pixels are not exposed to light in the process of writing the pixels. Illuminating, placing the pixels in a dark state so that the pixel information can be hidden (this information can present a transient change). For the same purpose, the addressing operation can be performed and the pixel information signal can be provided for one of the column electrodes associated with the pixel at the position at which the point for preventing light transmission is formed. This is because if there is a pixel information write transient state at the point for preventing light transmission, improper modulation due to the transient state does not affect the display.

Furthermore, it is preferred that the pixels corresponding to one of the spotlights or the boundary and/or the vicinity thereof are driven by a predetermined pixel information signal capable of preventing light transmission of the pixels. Since the so-called color mixing may occur in the area of the adjacent spotlight, one pixel corresponding to the color mixing portion can be driven by, for example, black level pixel information (better system darkest pixel information), thereby Preventing mixed color light from passing through degrades the quality of the display. Here, the driving of the pixels corresponding to the overlapping portion or the boundary of one of the spotlights and/or the vicinity thereof may be performed according to the following two operations: simultaneously selecting a plurality of column electrodes and simultaneously supplying the predetermined pixel information signals to the pixels Some of the column electrodes are selected so that efficient control can be achieved.

By defining the first to third color systems red, green and blue or a primary color (which can exhibit a white color or a non-white predetermined color when mixed), a reliable and satisfactory one can be obtained. The full color image you need. In addition, the spotlights may have their own width, or may make the width of at least one spotlight of the spotlights variable width, or may make the intensity of at least one of the spotlights become variable intensity, thereby increasing color balance. The chance of adjustment.

Furthermore, the range of pixels driven by the predetermined pixel information signals may correspond to generating a color mixing portion around one of the boundaries of the spotlight, and the width thereof is not less than a width of the color mixing portion, and thus may The light leakage from the light mixing portion is sufficiently cut off (even if a small amount of light leaks) to further improve the display quality.

The spotlights can be moved substantially simultaneously or sequentially over the display area depending on the style of the backlight system. In addition, the movement cycle of one of the spotlights on the display area can be equal to one frame period of the image to be displayed, thereby ensuring consistency with the original image information signal.

To achieve the above-mentioned objects, a second aspect of the present invention relates to a backlight system for use in the above aspects and forms of a display method, one of the display methods being a backlight system including a configuration in which A plurality of linear illumination segments for selectively applying the first to third color lights extend along the column electrodes and are disposed on the display region, and the backlight system is adjacent to the The photographing community segment of the illumination section corresponding to the forefront of the spotlight is switched to light illumination using one of the spotlights to perform the movement of the spotlights.

The second aspect is a backlight system comprising: a linear light source; a reflective plate for collecting light from the light source to a linear illumination surface; a dyeing member having a color film and capable of moving in a manner The color film allows the color film to pass through the illumination surface; and a light distribution conversion member for converting linear light rays that have been introduced from the illumination surface and dyed through the color film into a planar distributed Light rays; wherein the first to third colors of light are in a pattern possessed by the film, and movement of the spotlights on the display area is performed by an operation of the color film of the coloring member passing through the illumination surface. This can be done using a single light source to implement this display method. In this manner, another preferred form is obtained such that the color film has a dyed region corresponding to the first to third colors, respectively, and a light shield is formed at a joint position between the dyed regions. In this way, a more practical form is obtained, that is, the dyeing members are a cylindrical dyeing drum provided around the linear light source and about a predetermined central axis (as a rotating shaft) And rotated and the surface portion thereof has the color film.

The third aspect is a backlight system, comprising: a light guiding assembly board having a plurality of light guiding parts, each part extending along the column electrodes, wherein the column electrodes have a width such that the parts are Superimposing pixels associated with at least one column of electrodes, the light guiding components being arranged on the display area; and an optical system for selectively allowing the first to third of the light for each light guiding component The color enters a side surface of the light guiding member in the light guiding assembly, wherein an optical system adjacent to an optical system corresponding to one of the foremost portions of the spotlight is switched to turn on the light having the color of the spotlight to move the spotlight. This is the so-called edge-light source that satisfactorily implements this display method. Here, the light guiding member can be adapted to have a groove extending in a direction perpendicular to a longitudinal extension direction of the part and having an oblique angle for reflecting toward the display area from the optical The light of the system, or other equivalent reflective structure, results in a uniform light distribution in the direction of longitudinal extension of the light directing feature. Furthermore, a split layer may be provided between the light guiding components in the light guiding mounting plate, the dividing layer being composed of a material having a light reflecting property or a refractive index lower than a refractive index of the light guiding members, thereby The independence of the linear shape of each of the sub-concentrating lamps constituting the spotlight is satisfactorily ensured. In addition, an optical concentrating member can be provided between the optical system and the side surface of the light guiding member to construct a more efficient system.

Another aspect of the invention is also directed to a display device as described above and in the following description, the display device having the advantages of a device for various advantages associated with the display method and backlight system.

The above aspects and other specific forms of the present invention will be described in more detail by way of certain specific embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a basic general configuration of a liquid crystal display device in accordance with another embodiment of the present invention.

In this figure, the liquid crystal display device is mainly constructed by the following components: a transmissive liquid crystal display panel 1; a backlight unit 2, which is placed after the panel 1 to illuminate the rear portion of the panel And a peripheral circuit that generates signals and voltages that need to control or drive the panel 1 and the backlight unit 2, and supplies the signals and voltages to the panel 1 and the backlight unit 2.

The purpose of the liquid crystal display panel 1 is to facilitate a liquid crystal layer (not shown) interposed between two opposing transparent substrates to perform optical modulation according to an image to be displayed. The liquid crystal display panel 1 in this example adopts an active matrix type configuration, and one of the substrates 11 on the rear side thereof has, for example, a field effect type thin film transistor as a pixel driving active element in a predetermined display area (thin film). Transistor; TFT) 12, the TFTs are arranged in a matrix form and associated with the individual pixels. The gate electrodes of the TFTs 12 are respectively connected to a plurality of column electrodes Gx (x=0, which constitute a so-called scan line (the scan lines are parallel to each other in a horizontal (horizontal) direction in the display region). 1, 2, ...; hereinafter suitably referred to as "gate line"), and their source lines are respectively connected to form so-called signal lines (which run parallel to each other in a longitudinal (vertical) direction in the same display area) A plurality of row electrodes Sy (y = 0, 1, 2, ... are hereinafter referred to as "source lines" as appropriate). The drain electrodes of the TFTs 12 are individually connected to the pixel electrode 13.

A front side substrate 14 is another substrate of the display panel 1 and is disposed to face the rear substrate 11 with a specific gap, and a main surface facing the pixel electrode 13 (the inner surface of the panel) A common electrode 15 is formed thereon. A liquid crystal medium (not shown) is sealed in the gap between the substrate 11 and the substrate 14 to form a liquid crystal layer.

Selecting the TFTs 12 for each column by supplying a gate signal through the gate line Gx as a column of electrode signals (or column selection signals), while depending on the pixel information to be displayed (depending on The turned-on TFTs are driven as a row electrode signal (or a pixel information signal) through the level of the source signal supplied from the source lines Sy. According to this driving state, the pixel electrodes 13 are given a potential of their drain electrodes. The direction of the liquid crystal medium is controlled for each pixel electrode by an electric field whose intensity is defined by the difference between the potential of the pixel electrode and the voltage level supplied to the common electrode 15. Therefore, for each pixel according to the pixel information, the liquid crystal medium can adjust the rear illumination light from the backlight unit 2 and control the amount of light transmitted to the front side. Since the basic configuration details of this liquid crystal display panel have been well known by various documents, this article will not further explain.

In this embodiment, the display panel 1 does not have any color filter layers, and it has been customary to use a color filter layer for a full color display. As will be clearly explained in the following explanation, this is because the backlight unit 2 will assume the function of this color filter. Therefore, the display panel 1 can be a so-called monochrome display panel. However, for a particular purpose, this does not exclude the possibility of supplementally providing a color filter that produces one of the specific monochromatic dyeing effects.

The backlight unit 2 has a configuration for final planar illumination that covers the effective display area of the display panel 1. In addition, the backlight unit 2 individually generates first to third strip-shaped spotlights 2R, 2G, 2B carrying various types of so-called primary colors of light (red, green and blue in this example) in an elongated form, where they are elongated In the form of the spotlights, the spotlights are arranged parallel to each other along the gate lines Gx. The backlight unit 2 illuminates the display panel 1 by a spotlight as a rear light ray, and at the same time on one of the display areas of the display panel 1 in a direction perpendicular to the longitudinal extension direction of one of the spotlights (horizontal direction of FIG. 1) The spotlights are moved in the direction (the vertical direction of Figure 1). The backlight unit 2 is controlled such that each of the spotlights 2R, 2G, and 2B moves from one side of the display area to the other side opposite to the side, and such a moving pattern is repeated. It should be noted that only three spotlights 2R, 2G and 2B are shown here to first illustrate the basic configuration and operation, but in accordance with the present invention, at least four spotlights are used for the display panel 1. This aspect will be explained later. Details of the configuration and control of the backlight unit 2 will be described later.

In FIG. 1, the peripheral circuits are shown as components other than the display panel 1 and the backlight 2, and can be roughly divided into three systems: a display panel driving system 3, a backlight driving system 4, and a system control system 5.

The display panel drive system 3 includes a buffer memory 31 and an image memory 32 as image signal processing means, a source driver 33 as a row driving member, a gate driver 34 as a column driving member, and a common electrode driving member. One of the voltage generating circuits 35.

The buffer memory 31 sequentially receives digital image signals from a video signal supply system (not shown) for red (R), green (G), and blue (B) frames, and temporarily stores them in frame order or The digital image signals are written, and the stored image signals are read for each scan line according to a control signal from a timing controller 51, and the image signals are transmitted to the image memory 32. The image memory 32 stores the transmitted image signal in accordance with a control signal from the timing controller 51, and performs read control suitable for controlling the backlight unit 2, which will be described later. In the frame of the read control, the image signal for one of the next frames is written to the buffer memory 31. When the data for a scan line is read from the image memory 32, the data corresponding to the read target scan line is read from the buffer memory 31 and written into the image memory 32. The image signals are read from the image memory 32 for each scan line, and the read image signals are transmitted to the source driver 33 and stored in the source according to a control signal from the timing controller 51. In the pole driver 33. The source driver 33 supplies the stored image signal for one scan line as a source signal (pixel information signal) corresponding to its individual pixels to the individual source line Sy.

The gate driver 34 performs control to select any of the scan lines (ie, the gate line Gx) in accordance with a control signal from the timing controller 51, and the control will also be adapted to the backlight Unit 2 performs control, which will be described later. This gate line selection is performed by generating a gate signal for applying a predetermined (e.g., high level) gate to a desired gate line.

The voltage generating circuit 35 supplies an appropriate voltage signal to the common electrode 15 in accordance with a control signal from the timing controller 51. The voltage signal may be continuously galvanically or may be in accordance with one of the so-called alternating current (AC) driving methods. The level of this voltage signal acts as a reference potential for the source signal supplied to the source line Sy.

The backlight driving system 4 is constructed by a backlight driver 41 and other necessary components (not shown). The backlight driver 41 drives the backlight unit 2 in accordance with a control signal from the timing controller 51 under the control of the present invention. This control can be implemented in various ways, which will be explained in detail below.

As the system control system 5, this example employs a timing controller 51 that can be programmed in advance by processing steps. The timing controller 51 receives a synchronization signal from an image signal of a video signal supply system (not shown) and generates various control signals for carrying the timing and operation commands for the blocks 31 to 35 and 41. The synchronization signal received here may include a one-point block signal indicating one of each pixel data transmission timing; a so-called horizontal and vertical synchronization signal; and a frame synchronization signal indicating a frame period or the like. Based on the synchronization signals, the timing controller 51 generates control signals to perform control for the present invention, which will be described later.

Next, the basic operations of such control will be explained using FIGS. 2 and 3.

2 shows the movement of the spotlights 2R, 2G, 2B applied from the backlight unit 2 to the display panel 1, and also shows that one of the scanning line selections is performed together with the spotlight movements.

As described above, the spotlights 2R, 2G, 2B are moved on the display area in a direction perpendicular to the longitudinal direction of the spotlights (the vertical direction of FIG. 2), and each of the spotlights is from the display area. The side is repeatedly moved toward the other side opposite to this side, and the moving pattern is repeated. In this example, the patterns move from the top edge to the bottom edge of the screen.

First, in the case where one of the display panels 1 is illuminated as shown in FIG. 2(A), there is a red spotlight as a first spotlight, which is divided into two parts at the top and bottom edges of the screen, and serves as a second A green spotlight for the spotlight and a blue spotlight as a third spotlight are present between the red portions. In this example, the width of each spotlight is obtained by dividing the height of the screen by three, and each spotlight maintains its overall width appearing on the screen while moving. Splitting the spotlight with a particular spotlight moving beyond one of the bottom edges of the screen, and punctuating a portion other than the bottom edge to appear in an upper section of the screen, but the lower portion of the spotlight has an upper width and an upper width The system remains at 1/3 of the height of the screen.

In the case shown in (A) of Fig. 2, the display panel 1 is controlled such that the scanning lines corresponding to the irradiation positions of the individual red, green and blue spotlights are sequentially selected (addressing operation). In this example, a position is selected that is adjacent to one of the spotlights under the spotlight, which is within the illumination line of each spotlight. In the case shown in (A) of FIG. 2, the nth scan line corresponding to the red spotlight, the (n+x)th scan line corresponding to the green spotlight, and the (n+y) corresponding to the blue spotlight are selected. ) a scan line. Here, "nth", "(n+x)", "(n+y)" indicate that the scanning lines are numbered downward from the scanning line (first scanning line) located at the top of the display area. The sequential number of the time, and this point also applies to the following situations. In addition, x and y represent the spacing between one of the scan lines selected for the red spotlight and the scan line selected for the green and blue spotlights, and the same applies to the following situation.

After the above-described nth, (n+x)th, and (n+y)th scanning lines are selected, the backlight unit 2 is changed to the case shown in (B) of FIG. In this case, the irradiation position of each of the spotlights shown in (A) of Fig. 2 is shifted downward by one line. Here, in the case shown in (A) of FIG. 2, the display panel 1 is subjected to the same control so that the scanning lines associated with the pixels corresponding to the specific irradiation positions of the individual red, green, and blue spotlights are selected. Therefore, the (n+1)th scanning line corresponding to the red spotlight, the (n+x+1)th scanning line corresponding to the green spotlight, and the (n+y+1)th scanning line corresponding to the blue spotlight are selected.

Similarly, in the case of (C) of FIG. 2, the (n+2)th scan line corresponding to the red spotlight, the (n+x+2)th scan line corresponding to the green spotlight, and the corresponding blue spotlight are selected. The (n+y+2)th scan line. In this manner, one of the manners taken when the scan lines are selected for the individual spotlights on the display panel 1 is such that the individual spotlights are moved.

With the first half of the timetable in Figure 3, the operations illustrated so far will be more clearly shown.

In Fig. 3, one of the scan lines (gate lines) to be selected is indicated in the "Gt" section with a line number to be selected each time the selection is changed. For example, if a line number "n+x" is attached to "Gt", it means that the (n+x)th scan line is selected, and a gate signal for turning on the TFT connected to the selected line is supplied from the gate driver 34.

In addition, for a representative example of driving a source line of a pixel associated with a selected scan line, by adding the scan line number to the color of the corresponding pixel information in the "Sm" section of FIG. 3 (R , G, B) denotes a source signal supplied to the mth source line Sm (see FIG. 2) (numbered from the left side of the display area). In "Sm", for example, if the scan line number is "n+x" and the corresponding color is "G" (green), this means that the source is related to the (n+x)th scan line and is received by the source The line Sm drives one of the pixels, and a source signal (Gn+x, m) carrying pixel information for displaying the pixel as a green pixel is supplied to the source line Sm. As can be seen from Fig. 3, this source signal is updated in one cycle of one 1/3 horizontal scanning period (H). This corresponds to the supply operation of a pixel information signal.

Fig. 3 shows an example of a representative line of a waveform of a gate signal supplied to one of the nth gate lines in a "Gt-n" section. As can be seen here, in this example, the gate signal becomes active (high level) and the update time of one of the source signals is updated from one of the source signals shown in "Sm". There is a delay, and it becomes less active (lower level) than the next update. When the gate signal is active, all the TFTs for which the gate signal is applied remain in an ON state, so that the potential can be given according to the source signals supplied through the individual source lines. These individual bungee and pixel electrodes. This causes a new gate information (Rn, m) to be written to a pixel Pn,m, which is affected by one of the gate signals (as shown in FIG. 3), and the pixel Pn,m is subjected to the nth gate The line (Gt-n) and the mth source line (Sm) are driven. The "Rn,m" proposed herein represents pixel information that captures red (R) for pixels addressed to the nth and mth rows.

On the other hand, the driving mode of the backlight unit 2 is displayed in an "L" section. In this "L", the scan line number corresponding to one spotlight color switching position and before and after switching (R, G, B) is displayed. In "L", for example, if a scan line number is "n" and the color before and after the switch is "G→R", this point indicates that a green color was previously applied at a position corresponding to the nth scan line. The spotlight is switched to apply a red spotlight. 3 is a diagram showing that the driving state switching of the illumination section of the backlight unit 2 corresponds to the position of the spotlight corresponding to the nth scanning line, and the driving state is shown as a representative example of "Ln". Each of the illumination segments formed in the backlight unit 2 can selectively generate or transmit light of any one of red, green, and blue, and the illumination segment associated with the nth line performs this A switch causes the green light to be turned off (Goff) and the red light to be turned on (Ron).

This G→R switching should be performed when a sufficient time elapses after the new data Rn,m is written into the above-mentioned pixel Pn,m. This is because the pixel is kept in a transient state after the new data is actually written into one pixel until the pixel information of the new data remains stable, and therefore, if the color of the illumination light is switched in this transient state, the switched illumination is switched. Light will be improperly modulated. Therefore, the "sufficient time" referred to herein preferably means more than this time: from the start of writing the new data until the pixel stably holds the pixel information of the new material.

It should be noted that if G→R switching is performed before the new data Rn,m is written, a period will be generated at the pixel, during which the old data (green data Gn,m) will be used to change the switching. After the illumination light (red light). On the other hand, if G→R switching is performed after writing the new data Rn,m, a period is generated at the pixel, and the switching is modulated by the new data (red data Rn,m) during this period. Front illumination light (green light). Although the second cycle is a relatively short period of time, it also displays incorrect pixel information. Therefore, as shown by the dotted waveforms (Goff', Roff') in the "Ln" section of FIG. 3, it is preferable to cut off all the color illumination light to the write target line before writing new data to the pixel. And apply light of the corresponding color after writing new data. More specifically, when the illumination section Ln of the backlight unit 2 corresponding to the position of the selected line (Gt-n) performs G→R switching, the green light illumination (Goff') is first turned off and then the material is written. The red light illumination (Ron) is turned on after entering the selected line. Turn off the light corresponding to the old data, write the data when all the colors of the light are off, and turn on the light corresponding to the new data after a sufficient time (see above) after this time. Thereby, data is written to the selected line at a position where no light is applied and during a period, and thus the illumination light is never subjected to incorrect modulation. In addition, since the black display (forming a black dot) is performed in the non-irradiation position and the period, it acts as a so-called space-time black mask for preventing light transmission and hiding only the unnecessary display and thus enhancing the desire Display the visual quality of the image. Description of this black mask is omitted in FIG.

After switching the color of the spotlight corresponding to one of the scan lines, the switching state is maintained until a subsequent spotlight is applied to the position corresponding to the same scan line. As can be understood from FIG. 3, the backlight unit 2 sequentially changes the color of the individual spotlights of R, G, and B during each horizontal scanning period (H) so that each spotlight moves on the screen, and should be switched to select and correspond to One of the switching positions scans the line and writes pixel information on the selected scan line. In other words, for each horizontal scanning period, after writing the pixel information on the selected scanning line, an operation of changing the color of the spotlight corresponding to the position of the selected line is performed for each color. Thereby, the operations of (A) to (C) in Fig. 2 can be performed.

(D) of FIG. 2 shows a case in which the movement of the spotlights is further advanced, at which time the blue spotlight appears on the top and bottom edge sides of the screen, and the red and green spotlights are connected to the top of the screen. Between the bottom edge sides. This figure also shows a case in which the (n-1)th, (n+x-1), (n+y-1) scan lines are selected. This corresponds to a case in which the scanning lines immediately preceding (one more spatially upper level) are respectively selected with respect to the scanning lines selected in the foregoing drawing (A). (E) of FIG. 2 shows a case in which the movement of the spotlights is further advanced, and an nth scan line corresponding to the green spotlight, an (n+x)th scan line corresponding to the red spotlight, and corresponding to the The (n+y)th scan line of the green spotlight. This corresponds to the case where the same scanning line as in the previous diagram (A) is selected, respectively. (F) of FIG. 2 shows a case (as a next step) in which the (n+1)th scanning line corresponding to the blue spotlight, the (n+x+1)th scanning line corresponding to the red spotlight, and the corresponding The (n+y+1)th scan line of the green spotlight, which displays the selected line as in the previous figure (B).

As in the case of (A) to (C), the operations from (D) to (F) are shown in the last half of Fig. 3.

Now focus on the operation corresponding to (E) in Fig. 2. As shown in FIG. 3, a gate signal corresponding to one of the nth scan lines Gt-n rises during a first minute period (H/3) during the horizontal scan period, and is updated on the source line Sm. Data Bn, m pixel information, and the data Bn, m is written to the pixel Pn, m connected to the nth scan line to return to the high level of the gate signal. Next, in the backlight unit 2, R→B switching is performed by irradiating an illumination section corresponding to the position of the nth scanning line. Therefore, during this period, the illumination segment is switched from a previous red (R) illumination state to a blue (B) illumination state, and since then, the switching state is maintained until the corresponding scan corresponds to the same scan. When the position of the line is applied to the next spotlight (G) (not shown).

In this embodiment, the switching period of the illumination color of one of the illumination segments is substantially by the width of a spotlight (ie, the number of lines corresponding to 1/3 of the height of the screen (x or y-x). )) Multiplying H/3 (H is 1 horizontal scanning period) to obtain one time T, but the duration of the illumination color is T-α. Here, in the case where the timing offset at which the specific color illumination of the illumination segment is turned off is one time before the data is written (which is denoted as Goff' and Roff'), α corresponds to the perceived The number of time offsets.

Even after (F) of FIG. 2, the selection of the scanning line, the writing of the relevant pixels, and the switching control of the backlight unit 2 are repeated. After the pixel information of a specific color is written to one pixel associated with a specific scan line until the pixel information of the same color is written to the same scan line, corresponding to an original image signal (to the buffer in FIG. 1) One of the frame periods of the image signal supplied from the memory 31. During this frame period, each of the spotlights is applied to and cooperating with the entire screen area, and all of the scan lines of the screen are selected for pixel information for all colors.

Thus, a full color image display is obtained by repeating the operation as illustrated in FIG. In this embodiment, the display panel 1 does not have any color filter layer, and thus light loss is not generated in the color filter layer, thereby contributing to an increase in light use efficiency. In addition, the display panel 1 does not need to adopt a form in which a sub-pixel composed of three colors R, G, and B is composed of a main pixel, but may be composed only of main pixels, thereby making it possible to reduce the number of pixels and significantly increase the aperture ratio, and to help This simplifies the panel structure and reduces manufacturing costs.

FIG. 4 shows a specific configuration and illumination mode of the backlight unit 2.

The left side of FIG. 4 shows a cross-sectional structure of the backlight unit 2. When the backlight unit 2 is incorporated into the display panel 1, the right side shows a planar structure of the backlight unit 2 and its illumination light form in plan view. The backlight unit 2 has a transparent light guide plate 20 made of, for example, acrylate, and a linear light source section 21 provided on the light guide plate 20. The light guide plate 20 has a plurality of concave cross-section grooves 201 for accommodating the main light-emitting sections of the linear light source sections 21 (which are formed on the main surface of the light-irradiating side at predetermined intervals), and The grooves extend linearly from left to right parallel to each other on the display area.

The linear light source section 21 is constructed based on the recessed section trenches 201. First, a light-emitting diode layer 20B capable of emitting blue light is formed at the bottom of the recessed section trench 201. One of the light-emitting diode layers 20G capable of emitting green light and one of the light-emitting diode layers 20R capable of emitting red light are stacked on the layer 20B in this order. When a blue illumination command signal is applied, the layer 20B spontaneously emits blue light which passes through the other illumination layers 20G and 20R and is applied to the display panel 1 as a linear spotlight along the scan line. When green and red illumination command signals are applied, the layers 20G and 20R also spontaneously emit green light and red light, respectively, which are applied to the display panel 1 as linear spotlights along the scan lines.

The slits 202 extend in parallel in the longitudinal direction of the recessed section trenches and are provided between a recessed section trench and the other section trenches 201. The slit 202 forms a narrow channel space extending from the illumination surface side of the backlight unit 2 to generally reach the depth of the recessed section trench 201, in which air or other medium is present. The one passage space of the slit may also be formed to exceed the depth of the recessed section trench 201 or reach the rear surface of the light guide plate 20.

A plurality of longitudinal optical diffuse reflection films 203 are formed on the rear surface of the light guide plate 20 for each of the light source sections 21. The optical diffuse reflection films 203 are formed in parallel along the concave section trenches 201 and face the bottom surfaces of the individual recessed section trenches 201. The reflective films 203 reflect light leaking from the light-emitting layers 20R, 20G, 20B and return to the front portion (irradiation surface) to effectively use the light and diffuse the reflected light, thereby contributing to projection to the display panel The linear spot brightness on 1 is equalized.

The slit 202 reflects light rays from the light-emitting layers 20R, 20G, 20B depending on the presence of air or the like in the channel space. This point allows for the use of one of the longitudinal rectangular regions along the scan line (with the slit 202 acting as a defined boundary) as an area of illumination that is generally one of the linear source segments 21. The light rays from the light-emitting layers 20R, 20G, and 20B are not only propagated to the display panel 1 directly or through the internal refraction of the light guide plate 20, but are also reflected by the reflective film 203 and then propagated to or received by the display panel 1. The reflection of the slit 202 is then propagated to the display panel 1. The action is such that light propagating through the inside of the light guide plate 20 forms uniform brightness light on the rectangular illumination area, but direct illumination is different.

The backlight unit 2 in this configuration is controlled to change the illuminating color of the linear light source section 21 corresponding to the selected scanning line of the display panel 1. For example, in one of the cases shown in (A) of FIG. 2, after the nth scan line is selected and the corresponding red pixel information is written, the light source section 21n is switched to emit red light for application to the The position of the nth scan line in the display area (Fig. 4(1)). Similarly, for the (n+x)th scan line, the light source section 21n+x is switched to emit green light to apply the green light to the position of the (n+x)th scan line in the display area (Fig. 4(2) And) for the (n+y)th scan line, switching the light source section 21n+y to emit blue light to apply the blue light to the (n+y)th scan line in the display area (Fig. 4) (3)). For the other linear light source section 21, the light emission of any one of the red, green and blue colors is continuous, so that the formed spotlights respectively present strip-shaped spotlights 2R, 2G, 2B on the display panel 1. As shown in Figure 4. Supplying a control signal (red, green or blue illumination command signal) to the light source sections 21n, 21n+x, 21n+y, changing the illumination colors in (1) to (3) in response to the position to be illuminated by the light One of the scan lines selects the timing. The details of the selection of the scan line and the timing of the change in the illuminating color are consistent with those already illustrated in FIG.

The light source section 21 has been explained so far, assuming that the width W _{2 1} is equal to the scan line spacing of the display panel 1, but the backlight unit can be simplified by setting the width to an integer multiple of not less than 2 times the pitch. 2 configuration and manufacturing.

When the width W _{2 1} of the light source section 21 is set to a value (for example, three times the pitch of the scanning line), the light source sections 21 are responsible for illuminating the three consecutive scanning lines. In this case, for example, if the light source section 21n is responsible for the illumination associated with the nth (n+2)th scan line, the light source section 21n is selected as long as the nth (n+2)th scan line is selected. It will continuously emit and illuminate the corresponding colors. However, when the nth scanning line is selected, not only the light from the light source section 21n is applied to the position of the nth scanning line but also to the (n+1)th and (n+2)th scanning lines. Up, and thus performing erroneous optical modulation at the positions of the (n+1)th and (n+2)th scan lines because the pixel material has a different color from the light from the light source section 21n (which has been written about the n+1) and (n+2) scan lines). Such erroneous optical modulation can be attributed to the fact that when the scanning line is selected line by line, the color of the illumination light of the illumination section 21 of the backlight unit 2 changes every plurality of lines, thereby causing the display to be displayed. The image quality is degraded, but the change is instantaneous (in this embodiment, corresponding to one of the (n+1)th and (n+2)th scan lines, and one of the horizontal scan periods and two horizontal scan periods, respectively. These cycles), resulting in unwanted results.

Therefore, in order to eliminate such erroneous optical modulation, the illuminating color should be changed after all the scanning lines responsible for a light source section 21 have been selected and the corresponding pixel information is written. In the above case, after the selection of the three nth to (n+2)th scanning lines and the writing of the pixel information are completed, the light emission of the light source section 21n is switched. Figure 5 shows such an operation in the same format as in Figure 3.

As can be seen from FIG. 5, the nth to (n+2)th gate lines Gt-n, Gt-n+1, Gt-n+2, which should present red pixel information, are sequentially selected in each horizontal scanning period, but the corresponding illumination section 21n ( The G→R illumination switching of the red light of Ln) in FIG. 5 is performed during one of the last gate line Gt-n+2 selection period Tn+2. For the same purpose as described above, such illumination of red light is turned on after capturing pixel information associated with the last gate line Gt-n+2. In addition, before the first gate line Gt-n is selected (before the gate signal Gt-n rises) and the pixel information is captured in a non-illuminated state, the light illumination (Goff') of all colors is immediately turned off, Thereby, unnecessary light modulation due to one of the above-described pixel transient states when capturing pixel information of the gate lines Gt-n, Gt-n+1, Gt-n+2 is prevented.

In this manner, the light source section 21n (Ln) does not illuminate the corresponding positions until pixel information is written for all three nth (n+2)th scan lines. It is not until the writing is performed for the last scanning line Gt-n+2 that is responsible for the illumination section 21n (Ln) that the red light illumination switching (Ron) of the illumination section 21n is affected, and simultaneously for the three scans Optical modulation of the line. This eliminates the above-mentioned inconsistency (error optical modulation) between the scan line selection for each scan line and the illumination color switching for every multiple lines.

Since the illumination light rays of all colors are cut off during the process of writing the scan lines (for example, from the period of Goff' to Ron, see Fig. 5), this example relates to the action of the illustrated spatiotemporal black mask. When this case is represented in a format similar to that shown in Fig. 2, it looks similar to Fig. 6.

As can be understood from FIG. 6, in the individual strip-shaped space-time black matrix formed in the non-irradiation portion of the display panel, in this example, three scanning lines are selected each time and the writing of the individual pixel information is completed ((A) to (C1)), the corresponding illumination section of the backlight unit 2 changes the color of the illumination light and the spotlights advance by one step (C2). Immediately after the spotlight moves one step, the desired display of the pixel information for all selected scan lines is initiated. Figure 6 shows the display screen in a vertically longer dimension for one of the illustrated spaces, etc., but is different from the actual size and is not drawn to scale. In this respect, the same applies to Figure 2 and the following figures.

Referring back to FIG. 4, the light emitted from the linear light source section 21 is diffused outward to a certain extent and enters the display panel 1. Therefore, the spots emitted from the adjacent illumination sections 21 to produce a boundary of a different color spotlight overlap each other at their edges and enter the display panel 1 in the form of mixed colors. Therefore, light rays of an undesired color different from the original red, green and blue primary colors enter the display panel 1 on the overlapping portions R*G, G*B, B*R. When the light ray of an undesired color is modulated by the pixel information written therein, the light causes an optical modulation of an undesired color to affect the display light.

To prevent this from occurring, it is preferred to form the above-described spatiotemporal black matrix by turning off all of the colors of the illumination segments 21 (the incident light from which the emitted light produces this overlap). Therefore, in the above example shown in FIG. 5 and FIG. 6 , all the colors in the upper and lower illumination sections 21 corresponding to the spotlights of different colors are turned off, and the overlapping of spots of different colors is eliminated. Therefore, the above problem of color mixing can also be avoided.

On the other hand, depending on the configuration of the backlight unit used (unlike the configuration shown in Fig. 4), there is also a case where the individual illumination sections cannot turn off the illumination light and always selectively apply light of any of the colors. The above-mentioned space-time black matrix cannot be formed. Alternatively, there is also a case where the space-time black matrix is intentionally not formed to provide an advantage by simplifying the control of the backlight unit. In this case, the overlapping portions of the different color spotlights must appear on the display panel 1.

This overlap (i.e., the color mixing portion) can be prevented from affecting the displayed image, as explained below.

Fig. 7 is a view similar to Fig. 2, and shows an example of transition in order of (A), (A2), (B), (B2), (C), (C2).

In (A) of FIG. 7, the display panel 1 is controlled such that the nth, (n+x)th, and (n+y)th scanning lines corresponding to the irradiation positions of the red, green, and blue individual spotlights are sequentially selected. In this example, as in the above case, the selected scan lines are located at the foremost portion of the spotlights and are therefore located near the color mixing portion. Here, if the positions of the color mixing portions on the panel are indicated with respect to the selected scanning line, they may be the positions of the (n+q)th, (n+x+q)th, and (n+y+q)th scanning lines. q denotes an interval from one of the scanning lines (n, n+x, n+y, ...) selected for an original image display to the scanning line corresponding to the color mixing portion having the number of lines. In this example, the width of the color mixing portion corresponds to one scan line for clarity.

In the next stage, in the case of the same spotlight as in Fig. 7(A), the (n+q)th, (n+x+q)th, (n+y+q)th scanning lines corresponding to such a color mixing section are sequentially selected. (A2) of FIG. 7 shows this case, and the selected scan lines are returned, and the pixel information from the source lines is respectively written to the pixels associated with the selected lines. The pixel information written here is assumed to have information (the darkest pixel information) that exhibits a value of the highest shading rate (for example, black). This makes it possible to cut off the light in the color mixing portions by the darkest pixel information of the display panel 1, and thus it is possible to prevent the light of an undesired color from affecting the display. In this way, a spatiotemporal black mask can be formed which hides the color mixing portion on the display panel 1 in the form of a light mixing portion following the appearance.

Then, the spotlights are shifted downward by one step, and the (n+1)th, (n+x+1)th, (n+y+1)th scan lines are selected and the pixel information for display is written (FIG. 7(B)), and The execution selects the (n+1+q), (n+x+1+q), (n+y+1+q)th scan lines corresponding to the adjacent color mixing portion and writes the blackest pixel information (FIG. 7(B2)). Thereafter, the scan line of the display target pixel is selected and the pixel information for display is written, and the scan line corresponding to the color mixing portion is selected and the darkest pixel information is written to offset the spotlight.

Figure 8 shows Figure 7 in the form of a time diagram and follows the same format as that shown in Figure 3.

As can be seen from FIG. 8, for a pixel Pn+q,m corresponding to the color mixing portion, selecting nth, (n+x)th, (n+y)th scan lines and writing pixel information, and then selecting the corresponding first ( n+q) scan lines and write the blackest pixel information (bk). In this case, as in the case of the scanning line of the display target pixel, the writing of the darkest pixel information is performed in response to the rise of the corresponding gate signal Gt-n+q. This example assumes that the (n+q), (n+x+q), and (n+y+q)th scan lines are the same as the (n+1)th, (n+x+1)th, and (n+y+1)th scan lines, respectively (ie, q=1), but self-explanatory. It does not have to be the same. The purpose of the description herein is to provide an idea that the darkest pixel information is written to the pixels corresponding to the color mixing portion.

In the procedure from (A2) to (B) in Fig. 7, the pixel Pn+1 to be applied to the (n+1)th scanning line (see the section "Pn+q, m" shown in Fig. 8) is next placed. The color of the light changes to red (see the section "Lt-n+1" in FIG. 8 and an arrow t _{L S} ), and then the writing of the color pixel information Rn+1 is performed on the pixel Pn+1. The purpose of this is to prevent the light at the color mixing portion (R*G) from being modulated by the red pixel information Rn+1 of the pixel. That is, when the state of switching off one of the blackest pixel information is switched to one of the normal display pixel information on the display panel, the illumination light is first switched to the color corresponding to the normal display pixel information, and then the normal operation is performed. Display the writing of pixel information. Similarly, the illumination light is first switched to the corresponding color at the corresponding position, and then the green and blue pixel information Gn+x+1, Bn+y+1 is written to the pixels Pn+x+1, Pn+y+1 associated with the (n+x+1)th and (n+y+1)th scan lines. .

Although not shown in this example, in the case of changing the state of one of the normal display pixel information to the state of being cut off from one of the blackest pixel information, it is preferred that a certain scan is reached at the color mixing portion. Before the line, the darkest pixel information is written to the pixels on the scan line. This is because, by the fact that the darkest pixel information is written to the pixel in question after the color mixing portion arrives, the mixed color light is prevented from passing through the color mixing portion until the duration of the writing is completed ( And with the normal display pixel information written thereto and the transient modulation state of one of the pixel information, until the mixed color light is filled with the blackest pixel information.

The manner shown in Fig. 7 can also be realized by other controls than those based on the schedule shown in Fig. 8.

Figure 9 shows an example of taking other controls, which are drawn in a format similar to Figure 8. As can be understood from FIG. 9, during the period corresponding to FIG. 7 (A2), the selection (n+q), (n+x+q), and the corresponding (n+q), the (n+x+q) and the corresponding to the color mixing portions are simultaneously performed in a single H/3 period. (n+y+q) scan lines and capture the darkest pixel information (bk) for the scan lines. For this reason, the gate signals Gt-n+q, Gt-n+x+q, and Gt-n+y+q corresponding to the scanning lines are simultaneously raised. This is because the darkest pixel information (bk) of the same value can be written to the pixels associated with any of the scan lines corresponding to the color mixing portions, and all of the scan lines of the color mixing portions can be simultaneously selected and allowed The same source signal produces the same pixel information.

Thereby, a black mask can be formed in the color mixing portions in a short time. This also helps to simplify the control of the gate driver 34 and the source driver 33.

FIG. 10 shows another specific configuration example of the backlight unit, and parts equivalent to those shown in FIG. 4 are designated by the same reference symbols.

In FIG. 10, the backlight unit 2' is composed of an array of light-emitting diodes formed on a predetermined substrate 20', and the red, green and blue light-emitting diodes 20R, 20G, 20B are sequentially arranged in this order. The main surface of the substrate 20' is arranged in a strip shape from the top end to the bottom end of the panel 1. For each scan line or each of the plurality of scan lines, an illumination section 21 composed of one set of three-color light-emitting diodes is formed, and each of the diodes and the illumination section is formed in a longitudinal direction parallel along the scan line (and The situation shown in Figure 4 is the same).

A light guide plate 2a having a main surface and a diffuser 2b are disposed between the backlight unit 2' and the display panel 1, each covering at least one display area of the display panel 1. As in the case of the backlight unit 2', the light guide plate 2a and the diffuser 2b shown in Fig. 10 are shown as sectional views thereof. The light guide plate 2a has a prism array structure that collects light from the diode array and directs it to the diffuser 2b. The diffuser 2b diffuses the light from the light guide plate 2a, and equalizes the light distribution mainly in the longitudinal direction of the scanning line and a direction perpendicular thereto, and directs the diffused light to the display panel 1 to become a vertical square light. point. The light guide plate 2a can be omitted depending on the light distribution characteristics of the light emitting diode.

Fig. 10 shows, in a simplified form, the illumination mode of the light-emitting diode in the same case as that shown in Fig. 4, in which the closed light-emitting diodes 20R, 20G, 20B are shaded on the left side in a cross-sectional view. In this example, since the positions of the red, green, and blue light-emitting diodes are not the same in one illumination section 21, the illumination position in the illumination section 21 on the display area depends on the spotlight to be formed. The color varies, but the light collecting and diffusing functions of the light guide plate 2a and the diffuser 2b can reduce the change in the position irradiated onto the display panel 1.

The backlight unit 2' in the structure shown in Fig. 10 employs a control method of the illumination section 21 which is substantially the same as that shown in Fig. 4. In the configuration shown in FIG. 10, the layers of the light-emitting diodes do not overlap in a direction perpendicular to the major surface, and most of the applied light rays do not pass through the non-light-emitting diode layers. And thus it has one aspect that the loss of light use efficiency is smaller than that shown in FIG.

An optical diffusion reflective film 203 or a reflective film as shown in FIG. 4 may be formed for each of the irradiation sections 21 or on the entire surface on the rear portion of the substrate 20' shown in FIG. Further, a structure may be formed between the layers of the light-emitting diodes 20R, 20G, 20B for preventing emitted light rays or other light from the reflective film from leaking into other layers.

The configuration shown in Fig. 11 can be employed as a modified example of Fig. 4.

In Fig. 11, a groove 20v having a V-shaped cross section is provided on the rear portion of the substrate 20, and the bottom of the groove faces one end of a slit 202. An optical diffusion reflective film 203 is formed to fill the space inside the trench 20v and cover the entire rear surface of the substrate 20. This causes the light arriving from the light-emitting diodes 20R, 20G, 20B toward the rear portion to rebound on the slope of the trench 20v and return to one side of the light source diode. Therefore, the presence of this groove 20v prevents light emitted on one of the illumination sections 21 from leaking to the other illumination sections 21, thereby enhancing the independence of the illumination light of each illumination section and achieving efficient use of light. Further, since a single reflective layer can be formed on the entire rear surface of the substrate 20 without forming the optical diffusion reflective film 203 for each illumination section (as shown in FIG. 4), manufacturing advantages are obtained.

This variation in Figure 11 also applies to the configuration in Figure 10. That is, at the defined position of the irradiation section 21 shown in Fig. 10, the structure in Fig. 11 can be formed for the substrate 20'.

Figure 12 shows another configuration of the backlight unit.

The configuration shown in Figure 12 is not based on the configuration of a surface illumination member having a plurality of longitudinal illumination sources (as shown in Figures 4 and 10), but based on the next concept: that is, from one side of the display panel The light from a single source is linearly guided to form a spotlight distributed over the display area.

Based on this concept, as one of the optical distribution conversion members, the light guide plate 2LG (covering the display area) is placed at the rear of the display panel 1, and one of the illumination areas has a cylindrical illuminator 200 placed to face The side of the light guide plate 2LG (as the backlight unit). The cylindrical illuminator 200 has a structure similar to a barber shop sign and has mainly a fixed cylindrical cold cathode fluorescent lamp (CCFL) 25, which is attached to one side (for example, The left end surface of the light guide plate 2LG is arranged in parallel; and a fixed reflector 26 is adapted to surround the outside of the cold cathode fluorescent lamp 25 at a predetermined distance; and an optically transmissive dyeing drum 27 is attached It is wound around the outer side of the cold cathode fluorescent lamp 25 in a freely rotatable manner.

The fluorescent lamp 25 can be replaced by a Hot Cathode Fluorescent Lamp (HCFL). Although one type used herein is used as a white light source, a light source of other colors can also be used. The axis of the fluorescent lamp 25 is aligned with a straight line (center line), and the end surface of the light guide plate 2LG is divided into two halves along its longitudinal direction by this line. The reflector 26 is formed to surround the fluorescent lamp 25 (except for an exit region (irradiation surface) 26w from which light exits), and has a substantially parabolic surface for reflecting from the fluorescent lamp 25. Light and condense the reflected light onto the illuminated surface as efficiently as possible. The focus position of the parabolic surface is aligned with the axis of the fluorescent lamp 25 and the center line of the end surface of the light guide plate 2LG.

The dyeing drum 27 includes a mechanism (not shown) that is rotatable about the axis of the fluorescent lamp 25 (as a rotating shaft) at a predetermined speed. Light from the fluorescent lamp 25 passes through the illumination surface 26w defined by the aperture of the reflection plate 26, and is dyed at a surface section appearing outside the illumination surface of the dye drum 27, and directs the light to the light guide plate 2LG. The end surface. The guided light mainly propagates through the light guide plate 2LG in a planar shape in a lateral direction of the display area of the display panel 1, and the above-mentioned strip spotlights (2R, 2G, 2B) are formed in the display area. . Therefore, the end surface light that has passed through the illumination surface 26w is converted into planar illumination light that enters from the rear of the display panel 1 and spreads over the display area. Although not shown in FIG. 12, it is also possible to provide a necessary optical component for the conversion of such illumination light, or to provide an optical component to enhance the between the cylindrical illuminator 200 and the light guide plate 2LG and/or the light guide plate. The efficiency between 2LG and the display panel 1.

The dyeing drum 27 includes dyeing regions 27r, 27g, 27b corresponding to red, green, and blue spotlights (2R, 2G, 2B) respectively. When the dyeing drum 27 is rotated, the spotlights are in the display panel 1 from the The top to bottom of the display area moves continuously (as described above). The dyed regions can be formed into known dyed films having corresponding colors. Here, the dyed areas 27r, 27g, 27b of the dyeing drum 27 are formed in such a manner that when the dyeing drum 27 is rotated, one of the movement patterns of the spotlight is cycled on the display panel 1. When the drum surface is formed into a flat plane, the dyed regions 27r, 27g, 27b of the drum 27 appear to consist mainly of red, green and blue inclined strips. A black region 2BK having a predetermined width is formed along the boundary between the dyed regions 27r, 27g, 27b as needed. As explained above, the purpose of this is to prevent mixed color illumination of different colors of red, green, and blue generated on the display panel 1 (i.e., to form a black mask). The dyed regions 27r, 27g, and 27b are made of red, green, and blue color filter films, respectively, but the dyeing characteristics of the color filters can be appropriately changed depending on the light characteristics of the fluorescent lamp 26. As one of the criteria in this case, it is well known that a white color can be achieved when all colors are synthesized on the display panel, but this does not preclude the possibility of intentionally removing the standard.

In this configuration, when the dyeing drum 27 is rotated, the spotlight applied to the display panel 1 moves in accordance with the rotation. To make this movement more reliable, it is preferred to control the rotation of the dye drum 27 in a manner synchronized with the selection of the scan line. Although one rotation of the dyeing drum 27 does not always have to coincide with one of the spotlight moving patterns on the display panel 1, it is necessary to have the spotlight moving pattern on the display panel 1 during the continuous rotation of the dyeing drum 27. Repeat without interruption.

The configuration shown in Fig. 12 is more advantageous than those shown in Figs. 4 and 10 because the spotlight on the display panel 1 can be moved more smoothly. In addition, since it is constructed from a single light source, one advantage is that it requires only simple control.

Figure 13 shows the configuration of one of the other forms of the backlight unit.

The configuration in Figure 3 is based on a concept based on a light bar covering at least one scan line of the display panel 1 (shown above). The light rod 40 used has a rectangular appearance mainly composed of a parallelepiped, and a V-shaped groove 4v is formed on the rear portion (one side opposite to the side on which the light is applied). The grooves extend in one direction perpendicular to the longitudinal extension direction of the rod and are formed to appropriately reflect light incident on one end surface of the rod 40 toward the illumination surface side on the slope of the grooves. On the side of the light bar 40, a three-color light source 42 for the end surface is provided as a necessary optical system, and a convex lens 44 is provided between the light bar 40 and the light source 42 as a light collecting member. The light source 42 is composed of, for example, red, green, and blue light emitting diodes, and selectively turns on any of the two diodes and drives to emit light.

From a general perspective, light emitted from the light source 42 passes through the collecting lens 44 and enters the light bar 40, in which part of the light is reflected by the slope of the first groove 4v, and the rest of the light The inside of the light bar propagates and is reflected on the slope of the second stage trench 4v, while the other part of the light system is reflected on the third level trench, and so on. This procedure causes light to be reflected toward the illumination surface and distributed throughout the light bar 40. Fig. 13 shows an example in which there are three grooves 4v, but this number can be arbitrarily set. Further, the light source and the concentrating system may be disposed not only on one side but also on both sides of the light rod 40. Further, as shown in FIG. 13, in a configuration in which a light source is placed on only one side of the light bar 40, it is preferably formed to reflect internal propagation on opposite end surfaces of the light bar 40. The building of light. In this case, it is expected that the slope of the light reflected on the end surface with respect to the end surface side of the groove 4v can be similar to the above-described procedure, and the light use efficiency is improved. On the other hand, in the case where a light source is placed on only one side of the light bar 40 and no configuration of any reflecting member is provided on one end surface of the opposite side, a V-shaped groove may be employed. However, it has a structure of a slope only on the side of the light source. Additionally, the function of the lens 44 can be provided within each of the light units of the light source 42.

One of the light guides 400 as a light guide mounting plate (the plan view thereof is shown in a lower portion of FIG. 13) is configured by arranging a plurality of rods 40 having the structure of the flat plate shape and the edge surface thereof. Align with each other. A barrier layer 46 made of a material having a high reflectance or a refractive index lower than that of the light rod 40 is formed between the light rods 40 of the light pipe 400. This barrier layer 46 prevents light propagating inside the light bar 40 from entering the other light bars 40. Therefore, the independence of light in the propagation path can be established.

The light source 42 and the condensing lens 44 which have been described above are disposed on the side of the light pipe 400 in a one-to-one correspondence with the light bars 40. How to control each light source 42 is based on the meanings illustrated using Figures 4 and 10. The light guide 400 is placed on the back of the display panel 1 in such a manner that each illumination surface of the light bar 40 faces the rear of the display panel 1. Light propagating through the light pipe 400 is applied to the display panel 1 for each of the light bars 40.

FIG. 14 shows the situation in which the light pipe 400 is manufactured.

In Fig. 14, the following two are alternately stacked on a manufacturing substrate (not shown): a film 46' consisting of a highly reflective film or a reflector made of a transparent resin having a low refractive index. The barrier layer 46 is formed; and the light guiding layer 40' is made of a resin or the like having extremely high light transmittance to form the above-described light rod 40. The films 46' are preferably of a type of adhesive for promoting adhesion between the light guiding layers. A plurality of light guiding layers 40' required for stacking are stacked to cover the number of scanning lines applied by the display panel. When the stacking is completed, the structure is subjected to the necessary stabilization treatment, such as heating, drying to convert it into a stable structure.

Next, the multilayer structure obtained in this way is cut into a predetermined thickness. Such a cut is performed using a plane 40C that is parallel to the direction in which the film 46' and the light guiding layer 40' are stacked in a cutting surface. In this manner, one of the original forms of one of the light pipes 400 shown on the right side of FIG. 14 is produced. Next, after forming the trenches 4v and performing other necessary post-processing, the light pipe 400 having the structure shown in the lower portion of Fig. 13 is completely formed. The grooves 4v can be formed by, for example, grinding and embossing or the like.

According to the method of Fig. 14, if the multilayer structure is formed to a large size, more light pipes 400 can be easily fabricated by repeating the cutting step.

The light guide formed in this manner is applicable not only to the form shown in Fig. 13, but also to the form shown in Fig. 12, and serves as the light guide plate 2LG by a duct. Further, in the form shown in FIGS. 4 and 10, the backlight unit 2 has a configuration based on an array of linear illumination segments (rear source type) extending from one end of the display region to the other end. However, it is also possible to derive a modified example (edge light source type) using a light guide plate extending over the display area, as shown in FIG. 3, without using the linear illumination section and not from the area Light is introduced at the edge of the segment. As the light guide plate in this modified example, the light guide 400 illustrated in Figs. 13 and 14 can be applied.

In the example shown in Fig. 12, the fluorescent lamp 25 as a light source always emits light in the same driving state, and thus the variation of the power supply current is extremely small. This helps to reduce power consumption and reduce noise and chopping, which helps to stabilize the power supply of the entire display device. This point is largely applicable to the examples shown in Figures 4, 10 and 13. That is, in Figures 4, 10 and 13, most of the illumination segments are always in an operational state, and light of any color is emitted from an illuminated segment that is turned on/off. Therefore, the power consumption of the entire backlight unit is changed little, and the power supply is stabilized.

In the above basic example, only three wide spotlights corresponding to red, green, and blue are formed on the display panel, but the present invention is not necessarily limited to this spotlight configuration. That is, the width can be reduced to increase the number of spotlights corresponding to red, green, and blue. In this case, for example, a spotlight system is applied to the display panel 1 and moved as shown in FIG. 15 (in this case, there are two spotlights for each of red, green, and blue colors), but observation is observed. The situation is the same as in the case of using three spotlights in the basic example above. More specifically, during the horizontal scanning period "H" shown in the schedules in FIGS. 3, 5, 8, and 9, the top and bottom of the display area are sequentially selected and written corresponding to the red, green, and One of the blue spotlights scans the line, and then selects and writes a scan line corresponding to one of the red, green, and blue spotlights, performs a total of six scan line selections and writes the selected pixel information. Each time the cycle elapses (Figs. 3, 8, 9) or each time a pixel information is written on a predetermined scan line that is responsible for the illumination segment (Fig. 5), the spotlight moves one step. Therefore, as the number of spotlights applied to the display area increases, the number of times the pixel information is to be written in 1H increases, and thus the writing speed increases. The liquid crystal display panel must accordingly have a higher response speed characteristic.

In accordance with the above basic configuration and operation, specific points of the present invention will be explained below.

16 and 17 are diagrams showing such points and showing the relationship between a virtual area to be defined and a display area.

The purpose of a virtual area (shown as a dashed frame) 500 is to form a spotlight sequence to be presented in the display area of the panel 1. In the virtual area 500, a plurality of spotlights R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ , ... are designed to repeatedly move from the beginning to the end of the virtual area 500, which is more than The number of spotlights in the display area 510 (eight in this example), and is repeatedly designated as at least n in the order of the first to third colors (R, G, B) (n is one equal to or greater than 2) Integer; here is the 5) first to third color of the group. R _x , G _x , B _x (x=1, 2, ..., 5 or no subscript) shown here represent colors assigned to the spotlights as red, green, and blue, respectively. Such movements are shown in (a) to (c) of Fig. 16 and (d) to (t) of Fig. 17, in which some programs are omitted in the middle. (f) of FIG. 17 is followed by the case shown in (a) of FIG. 16, and if the state in (a) of FIG. 16 is assumed to be a point together, one of the spotlights in the virtual area 500 is circulated by returning again. The state in (a) of Fig. 16 is completed.

An effective range 510 (shown by a thick line in the figure) of the spotlight to be formed in the display area is defined in the virtual area 500, and the spotlight in the effective range is applied to the panel 1 as the rear light. For example, in (a) of FIG. 16, eight spotlights R ₂ , G ₂ , B ₂ , R ₃ , G ₃ , B ₃ , R ₄ , G ₄ enter the panel 1. It should be noted here that there is no need to apply a set of R, G, B spotlights to the display area (which is one of the basic examples as mentioned above). That is, as can be understood from FIGS. 16 and 17, the proportion of the R, G, and B spotlights in the display area varies depending on the movement of the spotlights, and the distribution of the R, G, and B spotlights becomes Not uniform. For example, in the case of (a) of FIG. 16, in the effective range 510, although there are three R spotlights, three G spotlights, and only two B spotlights, in the case of FIG. 16(b) Within the effective range 510, there are three R spotlights and 2.5 B, G spotlights. In contrast, in the foregoing basic example, the R, G, B spotlights in the display area remain at the same ratio without changing with the situation.

Therefore, the use of the virtual area 500 allows the proportion and/or distribution of the spotlights to be formed in the display area to be arbitrarily adjusted and varied depending on the movement of the spotlight. This point indicates that not only the number of spotlights appearing in the screen can be increased, but also the moving pattern can be made more complicated, thereby further enhancing the color separation preventing effect.

In the example of FIGS. 16 and 17, the number of spotlights in the virtual area is 15, and the number of spotlights in the display area is 8, but it is self-evident that the present invention is not limited to the numbers. As a minimum allowable number, the number of spotlights in the display area is four. One of the features of the present invention is not limited to the number "3" (i.e., the number of primary colors) of the technique disclosed in Patent Document 2 mentioned above. When the number of spotlights in the display area is 4, the number of spotlights in the virtual area becomes a multiple of the number of primary colors exceeding 4 (in the case of this embodiment, 3), which exceeds 4. Therefore, in accordance with this aspect of the invention, at least first to third spotlights of the first to third colors (R, G, and B) and one selected from the three colors are defined on the display area. Or a fourth spotlight of one of a plurality of colors (R, G, and/or B). Here, the first to fourth spotlights represent the first to fourth type (or type) of spotlights. This is considered in Figures 16 and 17, for example, the first spotlight represents R ₂ , R ₃ , the second spotlight represents G ₂ , G ₃ , and the third spotlight represents B ₂ , B ₃ and the fourth spotlight Represents R ₄ and G ₄ .

In addition, in FIGS. 16 and 17, the virtual regions 500 are designated as integers (5 in this example) by the light spots, respectively, but the present invention is not necessarily limited thereto, and R The number of spotlights, G spotlights, and B spotlights need not be the same. The composition of the spots to be formed in the virtual area 500 may be such that a predetermined reference color is displayed per unit time when synthesizing the spots appearing on the display area. For example, in a later illustrated form (where the spot has its specific width), there is a difference in the number of spots between R, G, and B in the virtual area, but if the spots are by different widths of spotlights By composing to compensate for the difference, one of the color synthesis effect actions produced can be equivalent to the effect produced by the same number of R, G, B spot numbers having the same width. This different width of the spot composition makes it easier to remove optical noise that may appear in the displayed image compared to a spot composition of the same width.

It should be noted that the virtual area referred to herein need not always be provided as a physical space (eg, memory or the like in the backlight driver 41). The concept that this virtual area is under the control of the backlight is only present and recognized.

Further, when performing such control of the spotlight movement using the virtual area, pixel driving is also performed for the panel 1 in accordance with the spotlight present in the display area and its movement, as in the case of the foregoing basic example . In addition, the aforementioned configuration and control are also applicable to the backlight system to which it is applied. Therefore, in this case, the form of the pixel driving and backlight system should refer to the above explanation.

The more the number of spotlights applied to the display area, the more advantages there are in preventing so-called color separation and in the display performance of moving images. This is because the number of colors that appear in each unit time in the display area is greater, and thus the visual recognition ability of the user so far can be exceeded.

Moreover, at this point in the description of the examples, it is assumed that the red, green and blue spotlights have equal widths, but they may each have different widths. For example, in terms of obtaining image color balance in accordance with the light intensity relationship of the individual colors obtained from the backlight unit, it is preferred if the preferred one suppresses green rather than blue and preferably suppresses red instead of green. The width of the spotlight used is less than the width in the case of blue in the case of blue, or the width in the case of red in the case of red. In this case, when focusing on one pixel, the green display is shorter than the blue display and the red display is shorter than the green display for the pixel information storage time of one of the pixels of the frame period. In this way, the intensity of the displayed color in the image thus obtained can be made different in the order of blue, green, and red. Here, the display color intensity is assumed to be balanced in the order of blue, green, and red, but other color balances may be used by using other width settings. In addition, this width setting can be variable regardless of whether the setting is performed automatically or whether it is intentional.

(B) of Fig. 18 shows a driving pattern on the display panel. It should be noted here that the pixel associated with the (equal) scan line corresponding to the position of the color mixing portion of the spotlights is driven by the blackest pixel information as described above (as shown in (B)) When the spotlight of the color mixing portion is displayed as black, when the spotlight as shown in (A) is applied to the display panel, the scanning line range of the display panel to be displayed as black is far more Big. Thereby, an ideal system can hide even small light leaks from the color mixing portion from the display.

Figure 19 shows a pixel and matrix electrode configuration of a display panel in accordance with a modified example. The purpose of this configuration is to simplify the control of the gate driver 34 and the source driver 33 compared to the aforementioned examples.

In FIG. 19, three gate lines G1 _R , G1 _G , and G1 _{B of} red, green, and blue are arranged for each column of pixels, and three source lines of red, green, and blue are arranged for each row of pixels. S1 _R , S1 _G , S1 _B ,... Three TFTs of red, green and blue are assigned to a pixel electrode, the gate electrodes of which are connected to their individual gate lines, and the source electrodes are connected to their individual source electrodes. All of the drains of the TFTs are connected to corresponding pixel electrodes.

Now, in the case shown in (A) of FIG. 2, it is assumed that the nth scanning line to be selected corresponds to one of the gate lines G2 _R , G2 _G , G2 _B , and the (n+x)th scanning line Corresponding to one of the gate lines Gm2 _R , Gm2 _G , Gm2 _B , and the (n+y)th scanning line corresponds to one of the gate lines Gz2 _R , Gz2 _G , Gz2 _B , and the gates are selected at the same time The gate lines correspond to the gate line G2 _R of the pixel information color to be displayed, the gate line Gm2 _G, and the gate line Gz2 _{B , respectively} . This synchronization selection is performed by supplying gate signals that become active at the same timing to the gate lines. A TFT connected to the selected gate lines is turned on, and pixel information signals from the source lines are supplied to the turned-on TFTs. The red pixel information signals from the source lines S1 _R , S2 _R , S3 _R , . . . are supplied to the TFTs connected to the gate lines G2 _R , and the greens from the source lines S1 _G , S2 _G , S3 _G , . The information signal is supplied to the TFT connected to the gate line Gm2 _G , and the blue information signal from the source lines S1 _B , S2 _B , S3 _B , . . . is supplied to the TFT connected to the gate line Gz2 _B. Pixel information signals of individual colors can be provided at the same time.

Thereby, when the spotlights are three spotlights of red, green and blue, the selection of three scan lines corresponding to red, green and blue of the spotlights can be simultaneously performed, instead of being as explained above. A horizontal scanning cycle takes a time-sharing approach. Therefore, the update period of the pixel information can continue to be a horizontal scanning period, so that the selection control of the gate line and the speed of the pixel information supply control of the source line can be avoided.

The configuration shown in Figure 19 is applicable to the case where the number of spotlights is three, red, green and blue, but the same concept applies to the case where the number of spotlights is larger. For example, when each color forms two spotlights (as shown in FIG. 15), the control may be repeated to simultaneously select three gate lines corresponding to the individual colors of the first group of colors of one of the selected target columns. The three gate lines supply corresponding pixel information signals, and then simultaneously select the remaining three gate lines of the individual colors of the second group of colors, and supply corresponding pixel information signals. Alternatively, multiple sets of red, green, and blue source lines can be added to simultaneously select six gate lines and supply corresponding pixel information signals.

In addition, in order to avoid the selection control of the gate line and the speed of the pixel information supply control of the source line, the dual-track configuration for the gate line and the source line as shown in FIG. 19 can be applied to FIG. In the example.

As an example obtained by further developing the configuration in Fig. 19, a form may be employed in which gate lines to be simultaneously selected are connected in advance by hardware. This provides an advantage that this configuration can be implemented without increasing the number of outputs of the gate driver 34.

Due to the composition of the spotlight, the explanations so far are limited to the three primary colors of red, green and blue, but the composition of the spotlight is not necessarily limited to the colors and other colors may be added to some or all of the colors, or the primary colors. Other combinations of other colors can be used. As an example of a method of selecting a color, a primary color that generally produces white light when all of the colors are mixed can be used, but it is not necessary to always use white as a standard. For example, in addition to red, green, and blue, white or any other color can be used as a primary color to increase the maximum brightness that can be rendered.

In addition, the present invention is not limited to the red, green, and blue spotlights appearing in a sequence from the start scan line of the display area in this order, and conversely, a color sequence recombination mode may also be employed, in which the color sequence may be employed. R, G, and B follow G, B, and R to further present B, R, and G, and then return the R, G, and B sequences and repeat the procedure or adopt a more complicated R, G, B appearance pattern. In this case, a spotlight appearance mode is set in such a manner that all the spotlights that have appeared in the display area in one of the images to be displayed or in a predetermined unit display period become white or intentional. Becomes a reference color other than white. When implementing this mode, the configuration with the features illustrated in Figures 16 and 17 is extremely advantageous.

In addition, the above description relates to the form in which the spotlight moves from the top to the bottom of the display area, and also allows the spotlights to move from the bottom to the top or from the top to the bottom and from the bottom to the top. Put it together.

The above specific embodiments have been described with respect to a fully transmissive display panel, but the present invention is also applicable to a so-called transflective display panel.

Furthermore, the present invention is not limited to an active matrix type, and the present invention is basically also applicable to a passive matrix type.

The above embodiment uses a liquid crystal display panel as a display panel, but the present invention is not limited thereto, and it is obvious that the present invention can be applied to any display panel as long as the display panel has a modulated transmission light to generate a transmission type of display light. Configuration is fine.

The present invention has been described with reference to the specific embodiments of the present invention, but the present invention is not limited to the specific embodiments, and various modifications may be made by those skilled in the art within the scope of the appended claims.

1. . . Display panel

11. . . Rear substrate

12. . . TFT

13. . . Pixel electrode

14. . . Front substrate

15. . . Common electrode

2,2'. . . Backlight unit

2R, 2G, 2B. . . spotlight

20,20'. . . Substrate

twenty one. . . Illuminated section

201. . . Sag groove

20R, 20G, 20B. . . Light-emitting diode

202. . . Slit

203. . . Optical diffuse reflection film

2a. . . Light guide panel

2b. . . Diffuser

20v. . . Trench

2LG. . . Light guide

200. . . Cylindrical illuminator

25. . . Fluorescent light

26. . . Reflective plate

26w. . . Illuminated surface

27. . . Dyeing drum

27r, 27g, 27b. . . Dyeing area

2BK. . . Black area

31. . . Buffer memory

32. . . Image memory

33. . . Source driver

34. . . Gate driver

35. . . Voltage generating circuit

41. . . Backlight driver

51. . . Timing controller

40. . . Light stick

4v. . . V-shaped groove

42. . . Tricolor light source

44. . . Condenser lens

400. . . Light pipe

500. . . Virtual area

510. . . effective coverage

1 is a block diagram showing a general conceptual configuration of a liquid crystal display device in accordance with an embodiment of the present invention.

2 is a schematic diagram showing a driving manner of an illumination spotlight from a backlight unit and a display panel in the liquid crystal display shown in FIG. 1.

Figure 3 is a flow chart showing the operation of the liquid crystal display device, which is related to Figure 2.

4 is a cross-sectional view and a plan view showing an example of a backlight unit applied to the liquid crystal display of FIG. 1 and an illumination spotlight emitted therefrom.

Figure 5 is a flow chart showing the operation of a liquid crystal display device in accordance with another embodiment of the present invention.

Figure 6 is a diagram showing one of the driving modes of an illumination spotlight from a backlight and a display panel, which is related to Figure 5.

Figure 7 is a diagram showing an illumination spotlight from a backlight unit and a driving mode of a display panel in a liquid crystal display device in accordance with another embodiment of the present invention.

Figure 8 is a flow chart showing the operation of the liquid crystal display device, which is related to Figure 7.

Figure 9 is a flow chart showing another mode of operation of the liquid crystal display device, which is related to Figure 7.

Figure 10 is a cross-sectional view and a plan view showing another example of a backlight unit applied to the liquid crystal display device shown in Figure 1 and an illumination spotlight emitted therefrom.

Figure 11 is a schematic cross-sectional view showing one modification of the backlight unit shown in Figure 4.

Figure 12 is a cross-sectional view and a plan view showing another example of a backlight unit applied to one of the liquid crystal display devices shown in Figure 1 and an illumination spotlight emitted therefrom.

Figure 13 is a perspective view and a plan view showing another configuration pattern applied to a backlight unit of a liquid crystal display device shown in Figure 1 and an illumination spotlight emitted therefrom.

Figure 14 is a schematic diagram showing one of the manufacturing methods of one of the light pipes used in the backlight unit of Figure 13.

Figure 15 is a diagram showing a modification of an illumination spotlight from a backlight unit and a display panel in a liquid crystal display device according to a modification.

Figure 16 is a diagram for explaining one of the characteristic features of one of the liquid crystal display devices and a representative front portion operation thereof according to an embodiment of the present invention.

Figure 17 is a diagram for explaining one of the characteristic features of one of the liquid crystal display devices and one representative of the latter part of the operation in accordance with an embodiment of the present invention.

Figure 18 is a view showing a modification of an illumination spotlight from a backlight unit and a display panel in a liquid crystal display device according to another modification of the present invention.

Figure 19 is a diagram showing one of the construction of one of the pixels and columns and the row electrodes of the display panel in accordance with one of the variations of the present invention.

Claims (24)

A display method using a transmissive matrix display panel, wherein a plurality of column electrodes and a plurality of row electrodes are disposed in the panel, and pixels are driven according to signals applied to the columns and row electrodes, wherein: a backlight system is used to individually Strip-shaped spotlights of at least first, second, and third colors formed along the column of electrodes are generated, and the display panel is illuminated by using the spotlights as a backlight while being on a display area of one of the display panels Moving the spotlights in a direction perpendicular to a longitudinal extension direction of one of the column electrodes, each of the spotlights repeatedly moving from one side of the display area to the other side opposite the side, in the display area There are first to third spotlights having at least the first to third colors, and a fourth spotlight having at least one color selected from at least the first to third colors; according to the spotlights Moving, repeatedly performing an address operation for each of the spotlights in the display area to select one of the illumination ranges corresponding to one of the spotlights a pixel associated with the pixel of the predetermined illumination position, or a specific boundary adjacent to one of the illumination spots of the spotlight; corresponding to the addressing operation, the pixel information signal of one of the spotlights is provided to the row electrode Or illuminating the pixel locations associated with the selected column electrodes or to be illuminated to drive the pixels; and defining a virtual region for forming a spotlight sequence to be presented in the display region, wherein the spotlight is presented The number is greater than the number of the spotlights to be presented in the display area and the first to third color fingers are Assigning the spotlights, and wherein each of the spotlights repeatedly moves from one of the beginnings of the virtual area to an end thereof, the virtual area having a defined range of a spotlight to be presented in the display area, Spotlights within this effective range are used as the first to fourth spotlights. A display method according to claim 1, wherein a black dot or other dots for preventing light transmission are formed between adjacent spotlights. The display method of claim 1 or 2, wherein a synchronization timing control is applied to the movement of the spotlights and the addressing operation. The display method of claim 1 or 2, wherein the illumination color is changed for pixels associated with the at least one selected column electrode after the addressing operation is completed and the pixels are driven according to the pixel information signals, To move the spotlight. The display method of claim 4, wherein the backlight system turns off the illumination light for pixels associated with the selected column electrode in the middle of the addressing operation and providing the pixel information signal. The display method of claim 2, wherein the addressing operation and the supply of the pixel information signal are performed for a column electrode associated with a pixel at a position at which the point for preventing light transmission is formed. The display method of claim 1, wherein the pixel corresponding to one of the spotlights or a boundary and/or a region thereof is driven by a predetermined pixel information signal capable of preventing light transmission of the pixels. The display method of claim 7, wherein the driving and the overlapping portion and the boundary of the spotlight and/or the attachment thereof are performed according to simultaneously selecting the plurality of column electrodes and simultaneously providing the predetermined pixel information signals to the selected column electrodes. The pixel corresponding to the near area. The display method according to claim 1 or 2, wherein the first to third colors are red, green, and blue, or three primary colors, and the primary colors may exhibit a white or non-white color when they are mixed. Predetermined color. The display method of claim 1 or 2, wherein the spotlights have a width thereof. The display method of claim 10, wherein one of the spotlights has a variable width of one of the spotlights. The display method of claim 1 or 2, wherein one of the spotlights has a density that is variable. The display method of claim 7, wherein driving the one pixel range by the predetermined pixel information signals corresponds to causing one color mixing portion around a boundary of the spotlight, and a width thereof is not less than the color mixture One of the widths. The display method of claim 1 or 2, wherein the spotlights move substantially simultaneously or sequentially over the display area. The display method of claim 1 or 2, wherein the one of the spotlights in the display area moves in a cycle equivalent to the frame period to be displayed. A backlight system for a display method according to any one of claims 1 to 15, comprising a configuration in which a plurality of linear illumination segments for selectively applying the first to third color lights are along The column electrodes extend and are disposed on the display area, and the backlight system performs the movement of the spotlights by performing control, wherein one of the illumination segments corresponding to the foremost portion of a spotlight is adjacent The illumination section is switched to use one of the spotlights To light the light. A backlight system for use in a display method according to any one of claims 1 to 15, comprising: a linear light source; a reflecting plate for collecting light rays from the light source to a linear Illuminating the surface; a dyeing member having a colored film and capable of moving the colored film in a manner such that the colored film passes through the illuminated surface; and a light distribution conversion member for using the illuminated surface The linear light that is introduced and dyed through the color film is converted into a planar distributed light ray; wherein the color film has a pattern in which the first to third colors of light are passed through the color film of the dyeing member The operation of passing through the surface performs the movement of the spotlights on the display area. The backlight system of claim 17, wherein the color film has a dyed area corresponding to the first to third colors, respectively, and a light-shielding area formed at an joint position between the dyed areas. The backlight system of claim 17, wherein the dyeing member is a cylindrical dyeing drum provided around the linear light source and rotated about a predetermined central axis as a rotating shaft, and the surface portion thereof has The color film. A backlight system for a display method according to any one of claims 1 to 15, comprising: a light guiding assembly board having a plurality of light guiding parts, each part being along the column electrodes Extending, the column electrodes have a width, wherein the part is superimposable on a plurality of pixels associated with at least one column of electrodes, the light guiding parts are arranged on the display area; and an optical system is used for each The parts selectively allow the light of the first to third colors to enter Entering a side surface of the light guiding component into the light guiding assembly, wherein the adjacent optical system of one of the optical systems corresponding to the foremost portion of the spotlight is switched to turn on light having a color of the spotlight to move the light spotlight. The backlight system of claim 20, wherein the light guiding member has a groove extending in a direction perpendicular to a longitudinal extension direction of the part and having an oblique angle toward the display area or the like An equivalent reflective structure reflects light from the optical systems. The backlight system of claim 20 or 21, wherein a dividing layer is provided between the light guiding members in the light guiding mounting plate, the dividing layer having a light reflecting property or a refractive index lower than the guiding The material composition of a refractive index of the optical component. The backlight system of claim 20 or 21, wherein an optical concentrating member is provided between the optical system and the side surface of the light guiding member. A display device using the backlight system of any one of claims 16 to 23.