JP2014219578A - Display device and display method - Google Patents

Abstract

The present invention displays information assigned to a light source that cannot be lit even when some light sources cannot be lit, and can display the image of the light source that can be lit without impairing the color of the image. Provided are a display device and a display method. According to the present invention, when at least one light source cannot be turned on, an image is displayed by each light source that can be turned on based on the preliminary video data, and the preliminary video data of one light source that can be turned on can be turned on. As a calculation coefficient of video data of other light sources, a value smaller than the calculation coefficient of video data of other light sources in the preliminary video data of other light sources is extracted. [Selection] Figure 3

Description

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

  In recent years, it has been proposed to use a light emitting diode (LED) as a light source in a projection display device. In particular, in a DLP (Digital-Light-Processing) (registered trademark) display device using DMD (Digital-Micromirror-Device), red light-emitting LED (hereinafter also referred to as R-LED) and green light are emitted. LEDs that emit blue light (hereinafter also referred to as G-LEDs) and LEDs that emit blue light (hereinafter also referred to as B-LEDs), and these three color LEDs are lit in time series (Patent Documents 1 to 3). 3). In such a projection display device, a light source drive circuit is provided for each light emission color of the light source. More specifically, three constant current circuits corresponding to the light emission color of the LED, such as a constant current circuit for R-LED, a constant current circuit for G-LED, and a constant current circuit for B-LED, are provided. ing.

  In the display device, the input video signal is digital data of each color, that is, red data (hereinafter also referred to as R data), green data (hereinafter also referred to as G data), and blue data (hereinafter also referred to as B data). The DMD is driven according to each color data, and intensity modulation is performed on the three colors of light. That is, red light is intensity-modulated according to R data, green light is intensity-modulated according to G data, and blue light is intensity-modulated according to B data. The three colors of light whose intensity has been modulated are projected onto a screen or the like through a projection lens, thereby displaying an image.

JP 2005-331705 A Japanese Patent No. 5055760 International Publication No. 2012/032887

  In the above display device, for example, when the R-LED cannot be turned on due to a failure of a constant current circuit, information to be expressed by R data is completely lost on display. This may cause a problem that important information cannot be displayed.

  A situation where other colors cannot be lit, a situation where two colors cannot be lit, and the like are also conceivable. Further, the emission color and the number of emission colors of the light source are not limited to the three colors illustrated above. The same problem may occur in a display device using a light source other than an LED or a display device using a light modulation means (for example, a liquid crystal panel) other than DMD.

  The present invention has been made to solve the above-described problem, and even when some of the plurality of light sources cannot be turned on, the information assigned to the light sources that cannot be turned on is completely absent. It is an object of the present invention to provide a display device and a display method capable of avoiding a situation in which the image is not displayed and capable of displaying without impairing the hue of the image relating to the light source color other than the light source that cannot be turned on.

  A display device according to an aspect of the present invention stores, from an input video signal, video data acquisition means for acquiring a plurality of video data respectively assigned to a plurality of light sources, and a plurality of calculation coefficients corresponding to each of the video data. An arithmetic coefficient storage unit, the arithmetic coefficient corresponding to each of the video data extracted from the arithmetic coefficient storage unit, and the video data corresponding to the arithmetic coefficient are calculated, and each of the light sources corresponds. When at least one of the calculation means for generating preliminary video data and the plurality of light sources cannot be turned on, the light emitted from the corresponding light sources that can be turned on is controlled based on the preliminary video data. Control means for displaying an image using the emitted light, and the preliminary image data corresponding to each of the light sources is included in each of the plurality of image data. Other corresponding light sources in the preliminary image data corresponding to the one light source that can be turned on, the calculation means corresponding to a value obtained by multiplying the corresponding calculation coefficient and taking the sum thereof. Is smaller than the calculation coefficient of the video data corresponding to the other light sources that can be turned on in the preliminary video data corresponding to the other light sources that can be turned on. The calculation coefficient of the value is extracted from the calculation coefficient storage means.

  A display method according to an aspect of the present invention includes: (a) a step of acquiring a plurality of video data respectively assigned to a plurality of light sources from an input video signal; and (b) a plurality of calculation coefficients corresponding to each of the video data. Using a seed, a step of storing in the arithmetic coefficient storage means in advance, and (c) the arithmetic coefficient corresponding to each video data extracted from the arithmetic coefficient storage means and the video data corresponding to the arithmetic coefficient. Calculating preliminary image data corresponding to each of the light sources, and (d) when at least one of the plurality of light sources cannot be lit, corresponding lighting based on the preliminary video data. Controlling the emitted light from each possible light source and displaying an image using the emitted light, and the preliminary image data corresponding to each light source includes a plurality of the Each of the image data corresponds to a value obtained by multiplying the corresponding calculation coefficient and further summing the image data, and the step (c) includes the preliminary image data corresponding to the one light source that can be turned on. The video data corresponding to the other light sources that can be turned on in the preliminary video data corresponding to the other light sources that can be turned on as the calculation coefficient of the video data corresponding to the other light sources that can be turned on. The operation coefficient having a value smaller than the operation coefficient is extracted from the operation coefficient storage means.

  According to the above aspect of the present invention, in a situation where some of the plurality of light sources cannot be turned on, the information assigned to the light source that cannot be turned on is assigned to the light source that can be turned on and is turned on. The influence of mutual input video signal components of possible light sources is suppressed. Therefore, it is possible to avoid a situation in which information assigned to a light source that cannot be turned on is not displayed at all, and it is possible to display without impairing the color of a video relating to a light source color other than the light source that cannot be turned on.

1 is a block diagram illustrating a display device according to a first embodiment. It is a block diagram which illustrates the normal image data acquisition means regarding a 1st embodiment. It is a block diagram which illustrates the data calculating means regarding 1st Embodiment. It is a flowchart which illustrates the preliminary | backup video data calculation regarding 1st Embodiment. It is a figure which illustrates operation | movement of the display apparatus regarding 1st Embodiment (normal display and all the light sources can be lighted). It is a figure which illustrates operation | movement of the display apparatus regarding 1st Embodiment (normal display and a red light source cannot be lighted). It is a figure which illustrates the display image by the display apparatus regarding 1st Embodiment (normal display and all the light sources can be lighted). It is a figure which illustrates the display image by the display apparatus regarding 1st Embodiment (normal display and a red light source cannot be lighted). It is a figure which illustrates operation | movement of the display apparatus regarding 1st Embodiment (preliminary display and a red light source cannot be lighted). It is a figure which illustrates the display image by the display apparatus regarding 1st Embodiment (preliminary display and a red light source cannot be lighted). It is a block diagram which illustrates a display concerning a 2nd embodiment. It is a flowchart which illustrates the display classification selection regarding 2nd Embodiment.

<First Embodiment>
<Overall configuration of display device 1>
FIG. 1 illustrates a block diagram of a display device 1 relating to the first embodiment. The display device 1 is a so-called projection type display device, and the user sees an image projected on the screen 50.

  In general, projection display devices are roughly classified into a front type and a rear type. In the front type, the user views the projected image from the projection surface side of the screen 50. The front type is also called a direct view type. On the other hand, in the rear type, the user views the projected image from the opposite side of the projection surface of the screen 50, that is, through the screen 50. Note that the screen 50 can be implemented by a dedicated member, for example, an indoor or outdoor wall surface, a glass surface, or the like.

  Here, the case where the display device 1 is a front type and the screen 50 is prepared as a separate member from the display device 1 is illustrated, but the present invention is not limited to this. That is, the configuration of the display device 1 can be applied to a rear type. Further, the screen 50 may constitute one element of the display device 1.

  In the example of FIG. 1, the display device 1 includes three light sources 10R, 10G, and 10B, an optical path synthesis unit 20, a modulation unit 30, a projection unit 40, a control unit 60, a light source driving unit 70, and a modulation drive. Means 80, data supply means 90, and operation means 100 are included. In the figure, for example, “control means” is abbreviated as “control”.

  The light sources 10R, 10G, and 10B each emit light of a predetermined color. Here, a case where the light emission colors of the light sources 10R, 10G, and 10B are different from each other is illustrated, but the following description also applies when the light emission colors of the light sources 10R, 10G, and 10B are all the same.

  Here, the case where the light sources 10R, 10G, and 10B are LEDs is illustrated. More specifically, the light source 10R is an LED that emits red light (hereinafter also referred to as R-LED), the light source 10G is an LED that emits green light (hereinafter also referred to as G-LED), and the light source 10B. Is an LED that emits blue light (hereinafter also referred to as B-LED). In the following description, the light source 10R may be referred to as an LED 10R or an R-LED 10R, and the same applies to the light sources 10G and 10B. Further, the light sources 10R, 10G, and 10B can be configured by a light source other than an LED, such as a laser.

  The outgoing lights 11R, 11G, and 11B emitted from the LEDs 10R, 10G, and 10B are guided to the same area of the screen 50 by sequentially following the optical path synthesis unit 20, the modulation unit 30, and the projection unit 40. In other words, the LEDs 10R, 10G, and 10B, the optical path synthesis unit 20, the modulation unit 30, and the projection unit 40 are arranged so as to follow such an optical path. In addition, the said optical path may be comprised including the element which is not illustrated here.

  The optical path combining means 20 guides the outgoing lights 11R, 11G, and 11B of the LEDs 10R, 10G, and 10B in the same direction, in other words, the same optical path. Here, a dichroic mirror is illustrated as the optical path combining unit 20, and the optical path combining unit 20 is also referred to as a dichroic mirror 20. The optical path combining unit 20 is not limited to a dichroic mirror. Further, the optical path synthesis means 20 may be constituted by a plurality of optical components.

  The modulation means 30 modulates light intensity modulation (hereinafter referred to as emission light 11R, 11G, 11B after the optical path is adjusted by the dichroic mirror 20) of the LEDs 10R, 10G, 10B (herein, the light emission 11R, 11G, 11B after the optical path is adjusted by the dichroic mirror 20). (Also referred to as modulation). The light intensity modulation is performed in units of pixels of the modulation means 30.

  Here, the modulation means 30 is constituted by a single modulation element. In view of this aspect, the modulation means 30 is also referred to as a modulation element 30. The single modulation element 30 is shared by the LEDs 10R, 10G, and 10B, and processes the emitted lights 11R, 11G, and 11B from the LEDs 10R, 10G, and 10B in a time division manner (in other words, time series).

  The modulation element 30 can be implemented by, for example, a liquid crystal panel, DMD (Digital-Micromirror-Device), or the like. It is assumed that the light intensity modulation by these modulation elements is performed by various known methods, and detailed description thereof is omitted here. The modulation elements are generally roughly classified into a transmission type and a reflection type, the liquid crystal panel is an example of a transmission type, and DMD is an example of a reflection type. FIG. 1 illustrates a transmissive modulation element 30.

  The projection unit 40 typically projects the modulated light beams 31R, 31G, and 31B after modulation output from the modulation unit 30 in an enlarged manner. Here, the projection means 40 is constituted by a single projection element (a projection lens is exemplified). In view of this aspect, the projection unit 40 is also referred to as a projection lens 40. The modulated lights 31R, 31G, and 31B projected from the projection lens 40 project an image on the screen 50 located on the optical path. The projection element may be a lens unit in which a plurality of lenses are combined.

  The control means 60 is responsible for various processes (control process, user input acquisition process, etc.) described later. The control means 60 can be embodied including, for example, a microprocessor (also referred to as MPU, CPU, or microcomputer) and a memory provided so that the microprocessor can be accessed. In the case of this example, various processes are performed by the microprocessor executing processing steps (in other words, processing procedures) described in a program stored in advance in the memory.

  According to such a configuration example, various functions corresponding to one or a plurality of processing steps are realized by the microprocessor. Alternatively, the microprocessor functions as various means corresponding to one or more processing steps.

  The microprocessor can adopt a multiprocessor or multicore configuration, for example. Further, the memory can be configured to include one or a plurality of ROM (Read Only Memory), RAM (Random Access Memory), rewritable nonvolatile memory (EPROM (Erasable Programmable ROM), etc.), for example. In addition to storing the program as described above, the memory stores various data and provides a work area for executing the program.

  According to such a configuration example, various processes performed by the control unit 60 are implemented by software, but part or all of the various processes can be implemented by hardware.

  The light source driving means 70 supplies driving power to the light sources 10R, 10G, and 10B, thereby driving the light sources 10R, 10G, and 10B. In the example in which the light sources 10R, 10G, and 10B are configured by LEDs, a constant current supply source is exemplified as the light source driving means 70. Further, here, a configuration in which a constant current circuit is provided in each of the LEDs 10R, 10G, and 10B is illustrated. That is, an R constant current circuit 71R that supplies a drive current to the R-LED 10R, a G constant current circuit 71G that supplies a drive current to the G-LED 10G, and a B constant current circuit 71B that supplies a drive current to the B-LED 10B. Is provided.

  The R constant current circuit 71R obtains the vertical synchronization signal Vsync from the data supply means 90, obtains the control signal 61R from the control means 60, and R− at a predetermined timing based on the vertical synchronization signal Vsync and the control signal 61R. The LED 71R is driven. Similarly, the constant current circuits 71G and 71B acquire the vertical synchronization signal Vsync from the data supply unit 90 and acquire the control signals 61G and 61B from the control unit 60, respectively. The G constant current circuit 71G drives the G-LED 71G at a predetermined timing based on the acquired vertical synchronization signal Vsync and control signal 61G, and the B constant current circuit 71B is based on the acquired vertical synchronization signal Vsync and control signal 61B. The B-LED 71B is driven at a predetermined timing. The drive timing of the LEDs 71R, 71G, 71B will be described later.

  The modulation driving unit 80 obtains the video data RD, GD, BD respectively assigned to the R-LED 71R, G-LED 71G, and B-LED 71B from the data supply unit 90, and modulates based on the video data RD, GD, BD. The element 30 is driven. More specifically, the modulation drive unit 80 controls the supply of drive power to each pixel of the modulation element 30 according to the video data RD, GD, BD and the modulation method employed in the modulation element 30. Thereby, each pixel takes a predetermined state according to the employed modulation method.

  Further, the modulation driving unit 80 acquires the vertical synchronization signal Vsync from the data supply unit 90, acquires the control signal 62 from the control unit 60, and drives the modulation element 30 based on the vertical synchronization signal Vsync and the control signal 62. Control timing. Such drive timing will be described later.

  That is, the modulation driving unit 80 drives each pixel of the modulation element 30 to a predetermined state at a predetermined timing.

  The modulation driving means 80 can be implemented mainly by hardware as a so-called driving power supply control circuit.

  The data supply means 90 supplies the video data RD, GD, BD and the vertical synchronization signal Vsync to the modulation driving means 80. In the example of FIG. 1, the data supply unit 90 includes a normal video data acquisition unit 120 and a data calculation unit 140. The data supply means 90 will be described later.

  The operation means 100 is a man-machine interface that connects the user and the display device 1, and is provided so as to be able to communicate with the control means 60 here. Accordingly, the user can input various instructions and data to the control unit 60 via the operation unit 100. The operation means 100 can be embodied as an operation panel provided in the display device 1, for example. Alternatively, the operation unit 100 may be embodied by a remote control system, for example.

  Here, the operation unit 100 is illustrated as an element of the display device 1, but a device or the like separate from the display device 1 can be used as the operation unit 100. For example, the display device 1 may be configured to be operated by an operation unit of a device (for example, a personal computer) that is connected to the display device 1 and supplies a display image.

<Configuration of Data Supply Unit 90>
In relation to the data supply means 90 (see FIG. 1), FIG. 2 illustrates a block diagram of the normal video data acquisition means 120, and FIG. 3 illustrates a block diagram of the data calculation means 140.

<Configuration of Normal Video Data Acquisition Unit 120>
The normal video data acquisition unit 120 acquires video data RP, GP, and BP respectively assigned to the LEDs 10R, 10G, and 10B during normal display from the input video signal 110. Hereinafter, the video data RP, GP, and BP that are normally used may be collectively referred to as normal video data D1.

  In the example of FIG. 2, the normal video data acquisition unit 120 includes a wiring 121, an analog / digital converter (hereinafter also referred to as A / D) 122, and a pixel conversion unit 123.

  The wiring 121 transmits the input video signal 110 from the video supply source inside or outside the display device 1 to the A / D 122. Here, as the input video signal 110, an analog RGB video signal output from a video card of a personal computer or the like is illustrated.

  The A / D 122 converts the input video signal 110 that has been input into digital data R0, G0, and B0. That is, the analog RGB input video signal 110 is converted into digital data R0, G0, B0 relating to red, green and blue components of the video supplied by the input video signal 110. Each of the digital data R0, G0, B0 is, for example, 8-bit data, in other words, 8-bit (256 steps) gradation data.

  The pixel conversion unit 123 acquires the digital data R0, G0, B0 from the A / D 122, and based on these data R0, G0, B0, the digital data RP, GP adapted to the output resolution and output timing of the display device 1 , BP and vertical synchronization signal Vsync are generated. The vertical synchronization signal Vsync is a reference signal when displaying one frame of video, and has a frequency of 60 Hz, for example.

  For example, when the input video signal 110 has the number of pixels of 1024 × 768 and the vertical frequency of 80 Hz, and the specification of the display device 1 is the number of pixels of 1400 × 1050 and the vertical frequency of 60 Hz, the pixel conversion unit 123 causes the resolution to be 1024 × The 768 video is enlarged and converted to a resolution of 1400 × 1050, and the frame rate is converted so that the output frequency is 60 Hz.

  As a result of such conversion processing, digital data RP, GP, and BP are obtained. The digital data RP, GP, and BP after the conversion process are digital data related to red, green, and blue components as in the case of the digital data R0, G0, and B0 before the conversion process, and are each 8-bit data, for example.

  Note that the pixel conversion means 123 can be implemented by hardware, software, or a combination thereof.

  Video data RP, GP, BP (that is, normal video data D1) is supplied to data calculation means 140 (see FIGS. 1 and 3). The vertical synchronization signal Vsync is supplied to the data calculation means 140, the modulation driving means 80, and the constant current circuits 71R, 71G, 71B (see FIG. 1), and is used as a reference signal for operation timing, for example.

  Note that the normal video data acquisition unit 120 may be configured to output other data and signals, for example, a horizontal synchronization signal supplied to the data calculation unit 140 and the modulation driving unit 80.

  The input video signal 110 may be a digital RGB video signal, for example. In addition, the input video signal 110 may be not only an RGB video signal but also a video signal of another format such as a video composite signal, a YCbCr signal, or an SDI signal. Depending on the type of the input video signal 110, the configuration of the normal video data acquisition unit 120 is appropriately modified.

  For example, when the input video signal 110 includes the video data RP, GP, BP and the vertical synchronization signal Vsync, the normal video data acquisition unit 120 is configured by only the wiring 121 according to the example of FIG. Thus, the video data RP, GP, BP and the vertical synchronization signal Vsync are acquired.

<Configuration of Data Calculation Unit 140>
In the example of FIG. 3, the data calculation unit 140 includes a calculation unit 170, a calculation coefficient storage unit 160, and a selection unit 180.

  The arithmetic means 170 includes a multiplier 171R that multiplies the video data RP by a coefficient α11, a multiplier 171G that multiplies the video data GP by a coefficient α12, a multiplier 171B that multiplies the video data BP by a coefficient α13, and a multiplier 171R. , 171G, 171B, and an adder 172 for adding the multiplication results. The addition result by the adder 172 is the video data RD.

  Similarly, the arithmetic means 170 includes multipliers 173R, 173G, and 173B that multiply the video data RP, GP, and BP by coefficients α21, α22, and α23, respectively, and an adder that adds the multiplication results of the multipliers 173R, 173G, and 173B. 174. The addition result by the adder 174 is video data GD.

  Similarly, the arithmetic means 170 includes multipliers 175R, 175G, and 175B that multiply the video data RP, GP, and BP by coefficients α31, α32, and α33, respectively, and an adder that adds the multiplication results of the multipliers 175R, 175G, and 175B. 176. The addition result by the adder 176 is the video data BD.

  The video data RD, GD, and BD after the arithmetic processing can be expressed by the following expression (1).

  Here, the arithmetic coefficient storage means 160 prepares a plurality of values of the coefficients α11 to α13, α21 to α23, and α31 to α33 used in the equation (1) in advance and stores them. That is, the calculation coefficient storage means 160 stores a plurality of calculation coefficients corresponding to each video data.

  The calculation coefficient storage unit 160 is disposed inside the data calculation unit 140 here, but is not limited thereto. For example, it can be arranged inside the control means 60 (see FIG. 1) or in other parts.

  Further, the arithmetic coefficient storage means 160 can be configured to include one or more of a ROM (Read Only Memory), a RAM (Random Access Memory), a rewritable nonvolatile memory (EPROM (Erasable Programmable ROM), etc.), for example. In addition, the contents can be configured to be easily changed by the operation means 100 (see FIG. 1) or the like via the control means 60 (see FIG. 1).

  The selection unit 180 calls arbitrary coefficients α11 to α13, α21 to α23, α31 to α33 from the calculation coefficient storage unit 160 in accordance with the selection instruction signal 63 from the control unit 60 (see FIG. 1), and sets the value of the arbitrary coefficient. The multipliers 171R, 171G, 171B, 173R, 173G, 173B, 175R, 175G, and 175B in the arithmetic means 170 are set.

  That is, the calculation means 170 is configured such that the calculation contents can be changed.

  Here, for example, if α11, α22, and α33 are set to 1 and α12, α13, α21, α23, α31, and α32 are set to 0 in equation (1), equation (2) is obtained.

  That is, the normal video data D1 is output as it is. Hereinafter, the state in which the normal video data D1 is output as it is as the video data RP, GP, BP in the arithmetic processing of Expression (2) is also referred to as a normal display state during normal display.

  On the other hand, calculation is performed by selecting a coefficient other than Equation (2) under the situation where some of the plurality of light sources that cannot be turned on, which is a problem to be solved by the present invention, and a preliminary image is obtained. A mode for outputting data is referred to as a preliminary mode, or more specifically, a preliminary mode_x. x is an arbitrary character string.

  For example, the standby mode when the R-LED is not lit in the display device 1 shown in FIG. Specific examples of coefficients for various preliminary modes will be described later.

  Also, the video displayed in the preliminary mode is referred to as preliminary display, more specifically, preliminary display_x. x is an arbitrary character string. Further, the video data used in the preliminary display are the preliminary video data, the preliminary video data_x, the preliminary video data (R), the preliminary video data (G), the preliminary video data (B), the preliminary video data_x (R), and the preliminary video data. Sometimes referred to as video data_x (G), preliminary video data_x (B), and the like.

  The video data RD, GD, and BD subjected to the arithmetic processing by the arithmetic means 170 are supplied to the modulation driving means 80 in the example of FIG. However, the output data RD, GD, and BD may be supplied to the modulation driving unit 80 after further performing various predetermined processes.

  It should be noted that the various processes of the calculation means 170, the calculation coefficient storage means 160, and the selection means 180 can be implemented by hardware, software, or a combination thereof.

  Here, in the display device 1, the content of the selection instruction signal 63 is set in accordance with an instruction from the user via the operation unit 100. More specifically, as illustrated in the flowchart of FIG. 4, the control unit 60 acquires an instruction from the user (step ST <b> 11), and outputs a selection instruction signal 63 having contents according to the determination result of the user instruction. (Step ST12). Then, the selection unit 180 selects a calculation coefficient from the calculation coefficient storage unit 160 according to the contents of the selection instruction signal 63 (step ST13), and the selected calculation coefficient is multiplied by the multipliers 171R, 171G, 171B, 173R, 173G, 173B, Set to 175R, 175G, and 175B (step ST14).

<Operation of Display Device 1>
The operation of the display device 1 is illustrated with reference to FIGS. 5 to 11 in addition to FIGS. 5, 6, and 9 exemplify the operation contents of the display device 1, and FIGS. 7, 8, and 10 exemplify display images by the display device 1.

  First, the operation of the display device 1 during normal display will be described. The normal display is executed when the user requests the normal display via the operation unit 100. The user instruction is input to the control unit 60, and the control unit 60 performs the following control process. However, the normal display may be automatically set when there is no normal display request from the user in the initial state or the like.

  When the control unit 60 receives the normal display instruction, the control unit 60 outputs the calculation coefficient (see Equation 2) for outputting the normal video data D1, that is, the video data RP, GP, BP, to the selection unit 180 of the data supply unit 90. Then, an instruction signal 63 for outputting to the calculation means 170 is transmitted (see FIG. 3).

  More specifically, the selection unit 180 selects a calculation coefficient related to the calculation of the normal display video data from the calculation coefficient storage unit 160 based on the control signal 63 from the control unit 60 and supplies the calculation coefficient to the calculation unit 170. As a result, the normal video data RP, GP, BP is supplied as the video data RD, GD, BD to the modulation driving means 80 as shown in the equation (2). The normal video data D1 is supplied in synchronization with the vertical synchronization signal Vsync in units of one frame (see FIG. 5).

  When distinguishing frames, n is a natural number, and the video data RP, GP, BP of the nth frame is expressed as RP (n), GP (n), BP (n).

  Further, the control means 60 transmits control signals 61R, 61G, 61B, and 62 relating to setting of drive timing to the constant current circuits 71R, 71G, 71B and the modulation drive means 80. The control signals 61R, 61G, 61B, and 62 here indicate that the operation is performed at the timing of dividing one frame period into three.

  As a result, the constant current circuits 71R, 71G, and 71B are configured to divide the LED 10R, 10G, and 10B into three frame periods based on the drive timing setting by the control signals 61R, 61G, and 61B and the vertical synchronization signal Vsync. The lamps are switched in order and turned on (see FIG. 5). That is, the LEDs 10R, 10G, and 10B are driven in a time division manner.

  Further, the modulation driving means 80 sequentially switches the supplied video data RP, GP, BP at a timing obtained by dividing one frame period into three based on the driving timing setting by the control signal 62 and the vertical synchronization signal Vsync. This is used for driving the modulation element 30 (see FIG. 5). That is, the modulation element 30 is driven in a time division manner.

  Here, the lighting order of the LEDs 10R, 10G, and 10B and the usage order of the video data RP, GP, and BP are not limited to the example of FIG. However, control is performed so that modulation driving is performed by video data corresponding to the emission color of the LED to be lit. That is, during the period when the R-LED 10R is lit, modulation driving is performed by the video data RD relating to red, while during the period when the G-LED 10G is lit, modulation driving is performed by the video data GD relating to green, and the period during which the B-LED 10B is lit. Modulation driving is performed by the video data BD relating to blue.

  As a result, red modulated light 31R (see FIG. 1) modulated by the video data RP, green modulated light 31G (see FIG. 1) modulated by the video data GP, and blue modulated by the video data BP. Modulated light 31B (see FIG. 1) is output from the projection lens 40 in a time-sharing manner. These color images are displayed on the same area of the screen 50 in a time-sharing manner. Note that these are synthesized and viewed as a color image by the user.

  Here, for example, it is assumed that the R-LED 10R does not operate normally due to a failure of the R constant current circuit 71R. When the normal display operation is performed in such a situation, an image by the R-LED 10R is not projected as shown in FIG. The same applies when, for example, the R-LED 10R itself is out of order.

  Therefore, for example, the gradation image of the single red color shown in FIG. 7 is displayed as a black image as shown in FIG. That is, information provided by the normal video data D1 (here, information called a red gradation video) is completely lost. 7 and 8 are examples of video data RD, GD, and BD, that is, examples of red, green, and blue gradation levels in a display video.

  However, in such a case, a preliminary display may be used. The preliminary display is executed when the user requests the preliminary display via the operation unit 100. Such a user instruction is input to the control means 60 when at least one of the plurality of light sources cannot be turned on, and the control means 60 performs the following control processing.

  When receiving a preliminary display instruction, more specifically, a preliminary display_r instruction, the control unit 60 transmits an instruction signal 63 for selecting the preliminary video mode_r to the selection unit 180 of the data supply unit 90. (See FIG. 3). As a result, the selection unit 180 selects the calculation coefficient corresponding to the preliminary video mode_r from the calculation coefficient storage unit 160 and supplies the calculation coefficient to the calculation unit 170. As a result, the video data RD, GD, and BD converted into the preliminary video data_r are supplied to the modulation driving means 80.

  More specifically, for example, the calculation coefficient of the preliminary video mode_r is given by the following equation (3).

  Equation (3) is just an example. Further, the values of α23 and α32 are 0. However, the numerical values exemplified in Expression (3) are not limited to this.

  That is, as the calculation coefficient (α23) of the video data (BP) corresponding to the other light source (B) that can be turned on in the preliminary video data (GD) corresponding to the light source (G) that can be turned on, In the preliminary video data (BD) corresponding to the light source (B), an arithmetic coefficient having a value smaller than the arithmetic coefficient (α33) of the video data (BP) corresponding to the other light source (B) that can be turned on is stored in the arithmetic coefficient. What is necessary is just to be extracted from the means 160. FIG.

  On the other hand, in the preliminary image data (BD) corresponding to the light source (B) that can be turned on, the calculation coefficient (α32) of the video data (GP) corresponding to the other light source (G) that can be turned on In the preliminary video data (GD) corresponding to the light source (G), the calculation coefficient having a smaller value than the calculation coefficient (α22) of the video data (GP) corresponding to the other light source (G) that can be turned on What is necessary is just to be extracted from the storage means 160. FIG.

  When Expression (3) is substituted into Expression (1), the following Expressions (4) to (6) are obtained.

  Here, the equations (4), (5), and (6) represent the preliminary video data_r (R), the preliminary video data_r (G), and the preliminary video data_r (B), respectively. The preliminary video data (RD, GD, BD) is a value obtained by multiplying each of the plurality of video data (RP, GP, BP) by a corresponding calculation coefficient and further taking the sum.

  The preliminary video data is supplied in synchronization with the vertical synchronization signal Vsync in units of one frame (see FIG. 9).

  When distinguishing frames, n is a natural number and the video data of the nth frame is expressed as RD (n), GD (n), BD (n).

  Further, the control means 60 sets the drive timing of the constant current circuits 71R, 71G, 71B and the modulation drive means 80 in the same way as during normal display.

  In addition, since the setting content of the drive timing regarding the first embodiment is the same between the normal display and the preliminary display, for example, the setting is performed when the display device 1 is turned on, and the setting operation is performed when switching between the normal display and the preliminary display. Can be omitted.

  Here, the operation itself of the modulation driving means 80 is the same during normal display and during preliminary display. However, the types of video data RD, GD, and BD supplied to the modulation driving unit 80 are different as described above. That is, the supply data RD, GD, and BD during normal display correspond to the data RP, GP, and DP relating to the display color (see FIG. 5). On the other hand, supply data RD, GD, and BD at the time of preliminary display are preliminary video signals that have been subjected to the arithmetic processing shown in equations (4) to (6) (see FIG. 9).

  Therefore, in the preliminary display_r, the modulation driving unit 80 performs preliminary video data_r (R) in which the arithmetic processing is performed according to the equations (4) to (6) at each of the timings obtained by dividing the period into three in one frame period. ), The modulation element 30 is driven by the preliminary video data_r (G) and the preliminary video data_r (B) (see FIG. 9).

  However, since the R-LED 10R cannot be lit, an image is not projected during the projection period of the R-LED 10R even if the modulation element 30 performs a modulation operation.

  Therefore, although the coefficients α11, α12, and α13 used for the calculation for obtaining the red preliminary image data RD in Expression (3) are set to 0, the result is the same even if it is any appropriate numerical value. It is not always necessary to set 0.

  As a result, the green modulated light 31G (see FIG. 1) modulated by the preliminary video data GD obtained by the equation (5) and the blue modulated light modulated by the preliminary video data BD obtained by the equation (6). 31B (see FIG. 1) is output from the projection lens 40 in a time-sharing manner. As a result, a green image and a blue image are displayed on the screen 50 in a time-sharing manner.

  In this case, for example, the gradation image of the single red color shown in FIG. 7 is displayed as a light blue gradation image as shown in FIG. The numerical values described in FIG. 10 are examples of video data RD, GD, and BD, that is, examples of red, green, and blue gradation levels in a display video.

  That is, according to the preliminary display, the information of the color red is lost, but the information of gradation can be displayed. Therefore, it is possible to prevent the information provided by the normal video data D1 (here, information called red gradation video) from being completely lost. In the red gradation image exemplified here, the information of gradation is considered to be more important than the information of red, and thus is useful in that omission of important information can be avoided.

  Further, according to the preliminary display_r, the calculation formula (see formula (5)) of the preliminary video data_r (G) corresponding to the G-LED 10G which is a display color other than the R-LED 10R that has become unlit is further included. The other display colors that are displayable colors, that is, the component of the input video data BP that is a blue video component are not included. Accordingly, it is possible to reproduce the information display using only the green video component included in the normal video data D1 without mixing the blue video component.

  Similarly, in the calculation formula (see formula (6)) of the preliminary video data_r (B) corresponding to the B-LED 10B, the input video data GP that is a green video component, which is another display color that can be displayed. Contains no ingredients. Therefore, regarding the information display using only the blue video component included in the normal video data D1, the green video component can be reproduced without being mixed.

  By the same method, even when the G-LED 10G or the B-LED 10B cannot be turned on, the information provided by the normal video data D1 is not impaired without losing the hue related to the video color other than the color components that cannot be turned on. Complete omissions can be avoided. An example of the calculation coefficient in this case is shown in the following equations (7) and (8).

  Expression (7) is merely an example of the calculation coefficient for the preliminary video mode_g, and Expression (8) is an example of the calculation coefficient for the preliminary video mode_b. Further, the values of α13 and α31 in the equation (7) and the values of α12 and α21 in the equation (8) are 0. However, it is not limited to these numerical values.

  When Expression (7) and Expression (8) are substituted into Expression (1), the following Expressions (9) to (14) are obtained.

  Here, the equations (9), (10), (11), (12), (13), and (14) are respectively reserved video data_g (R), preliminary video data_g (G), and preliminary video data_g. (B), preliminary video data_b (R), preliminary video data_b (G), and preliminary video data_b (B) are shown.

  According to the present embodiment, for example, when the user detects that the LED 10R is not lit, the operation coefficient 100 is selected by selecting an operation coefficient 100 or the like to select the preliminary display_r, and the expression (4) ) To (6), preliminary image data RD, GD, and BD for the preliminary mode_r can be obtained. Similarly, when the LED 10G is not lit, the preliminary display_g instruction is selected, and when the LED 10B is not lit, the preliminary display_b instruction is selected. Is selected, the preliminary image data for the standby mode_g is selected according to the equations (9) to (11), and when the LED 10B is not lit, the calculation coefficient of the equation (8) is selected and the equations (12) to (14) are selected. Thus, it is possible to obtain spare video data for the spare mode_b.

  If no LED non-lighting is detected, that is, if all the LEDs are normally lit, the normal video data, that is, the input video data is left as it is by selecting the calculation coefficient of equation (2). It is possible to output it.

  In addition, although the above illustrated the case where 3 color LED was used as a light source color to the last, it is not this limitation.

  According to such a configuration example, various processes performed by the control unit 60 are implemented by software, but part or all of the various processes can be implemented by hardware.

<Effect>
As described above, according to the display device 1, it is possible to arbitrarily select a plurality of types of preliminary video data including the normal video data D1. Therefore, for example, when a part of the light sources cannot be turned on, the situation in which the information assigned to the light sources that cannot be turned on in the normal video data D1 is not displayed at all can be avoided by using appropriate preliminary video data. It becomes possible.

  Such an effect is obtained when the preliminary video data is different from the normal video data D1.

  Here, when the preliminary video data is generated by the arithmetic processing in the arithmetic means 170, the color components other than the color components that cannot be lit are converted so that the preliminary video data do not affect each other, and It is preferable that the input video data (information) relating to the color components that cannot be lit is incorporated in the preliminary video data. This is due to the following reason.

  For example, in the configuration of Patent Document 3, the content of a video signal related to a color component that has become unlit can be obtained from ITU-R BT. 601 and ITU-R BT. By performing RGB → Y conversion using the calculation formula 709 and calculating as luminance information, the remaining light source color is used.

  However, with this method, the purity of the input video signal component relating to the remaining light source color is impaired, and an accurate color may not be reproduced even though the displayed video color is a video color corresponding to the remaining light source color. there were.

  According to the method shown in the present embodiment, all of the video data RP, GP, and BP assigned to the LEDs 10R, 10G, and 10B during normal display are incorporated into the preliminary video data RD, GD, and BD. In addition, when some of the LEDs cannot be lit, it is possible to suppress the influence of the mutual input video signal components on the preliminary video signal that modulates the remaining LEDs, and to select the calculation coefficient.

  Therefore, even when some of the LEDs become unlit, it is possible to display information on the color components that have become unlit with the remaining LEDs without impairing the color shade of the video colors related to the remaining LEDs. .

  According to the present embodiment, such an effect is obtained by, for example, calculating video data (BP) corresponding to another light source (B) that can be turned on in preliminary video data (GD) corresponding to the light source (G) that can be turned on. The coefficient (α23) is based on the calculation coefficient (α33) of the video data (BP) corresponding to the other light source (B) that can be turned on in the preliminary video data (BD) corresponding to the other light source (B) that can be turned on. Is also obtained by being small.

  More specifically, the calculation coefficients α23 and α32 in Expression (3), the calculation coefficients α13 and α31 in Expression (7), and the values of α12 and α21 in Expression (8) are preferably 0. .

  By the way, the arithmetic means 170 performs conversion from the normal video data 124 to the preliminary video data RD, GD, BD according to a predetermined calculation. For this reason, it is possible to simplify the conversion control flow, to reduce the scale of the apparatus configuration, to easily change the calculation contents, and so on, as compared with conversion using a so-called lookup table (LUT).

  For example, in the configuration of Patent Document 2, an image frame used when a light source fails is generated using an LUT. When this method is used, there are many cases, and a complicated conversion control flow is required. On the other hand, according to the configuration relating to the present embodiment, the preliminary video data RD, GD, and BD are generated by arithmetic processing according to a predetermined arithmetic expression, so that the conversion control flow is simple (see FIG. 4). .

  Further, since the conversion control flow is simple, the configuration for executing the flow can be simple. Therefore, the scale of the device configuration can be reduced.

  Further, according to the arithmetic means 170, it is easy to change the multiplication coefficient in the multipliers 171R, 171G, 171B, 173R, 173G, 173B, 175R, 175G, and 175B. That is, it is easy to change the calculation content. On the other hand, according to the LUT method, since all the contents of the LUT must be changed, the change of the calculation contents becomes large.

Second Embodiment
In the first embodiment, a case where the user switches between normal display and preliminary display is illustrated. In contrast, the second embodiment exemplifies a configuration for automating such switching.

  FIG. 11 illustrates a block diagram of the display device 2 according to the second embodiment. The display device 2 illustrated in FIG. 11 has a configuration in which a detection unit 190 that detects the lighting state of the LEDs 10R, 10G, and 10B is added to the display device 1 (see FIG. 1) related to the first embodiment.

  The detection means 190 can be implemented by a plurality of optical sensors provided for the LEDs 10R, 10G, and 10B, for example. More specifically, an optical sensor for the R-LED 10R is provided in a manner capable of detecting the emitted light 11R of the R-LED 10R, and similarly, an optical sensor for the LEDs 10G and 10B is provided. According to this example, it is possible to detect the lighting state of the LEDs 10R, 10G, and 10B by detecting the presence or absence of the emitted light 11R, 11G, and 11B or the amount of light.

  Alternatively, the detection unit 190 can be realized by a plurality of current sensors provided for the LEDs 10R, 10G, and 10B, for example. More specifically, a current sensor for the R-LED 10R is provided in a manner capable of detecting a current supplied to the R-LED 10R, and similarly, a current sensor for the LEDs 10G and 10B is provided. According to this example, it is possible to detect the lighting state of the LEDs 10R, 10G, and 10B by detecting the presence or absence of the current supplied to the LEDs 10R, 10G, and 10B.

  In addition, it is also possible to employ | adopt the voltage sensor which detects the voltage applied to LED10R, 10G, 10B, the power sensor which detects the electric power supplied to LED10R, 10G, 10B, etc.

  The detection result by the detection unit 190 is transmitted to the control unit 60, and the control unit 60 controls the selection unit 180 (see FIG. 3) and the like based on the detection result.

  Here, the flowchart of the control concerning FIG. 12 is illustrated. According to the example of FIG. 12, the control means 60 acquires the detection result by the detection means 190 (step ST21), and whether or not each of the LEDs 10R, 10G, and 10B is lit at a predetermined timing and period from the detection result. Thus, it is determined whether or not all the LEDs 10R, 10G, and 10B are operating normally (step ST22). Based on the determination result of step ST22, the control means 60 selects an operation coefficient from the operation coefficient storage means 160 (step ST23), and uses the selected operation coefficient as a multiplier 171R, 171G, 171B, 173R, 173G, 173B, 175R, 175G. , 175B (step ST24).

  In addition, since the LED which can be lighted can be specified according to the detection result of the detection means 190, the control means 60 can perform mode selection, such as preliminary | backup mode_r demonstrated in 1st Embodiment.

  More specifically, for example, when the non-lighting of the LED 10R is detected, the spare image data for the spare mode_r is selected by the arithmetic expression shown in the expressions (4) to (6) by selecting the arithmetic coefficient of the expression (3). RD, GD, and BD can be obtained. Similarly, when the non-lighting of the LED 10G is detected, the calculation coefficient of the equation (7) is selected, and the preliminary image data for the preliminary mode_g is detected from the equations (9) to (11), and the non-lighting of the LED 10B is detected. In this case, it is only necessary to select the calculation coefficient of the equation (8) and to obtain the spare video data for the spare mode_b according to the equations (12) to (14).

  If no LED non-lighting is detected, that is, if all the LEDs are normally lit, the normal video data, that is, the input video data is left as it is by selecting the calculation coefficient of equation (2). It is possible to output it.

  In addition, although the above illustrated the case where 3 color LED was used as a light source color to the last, it is not this limitation.

  According to such a configuration example, various processes performed by the control unit 60 are implemented by software, but part or all of the various processes can be implemented by hardware.

<Effect>
According to the display device 2, in addition to the various effects described in the first embodiment, the following effects can be obtained. That is, by automatically detecting a light source that cannot be turned on, it is possible to automatically select a calculation coefficient for performing an optimal preliminary display and to automatically switch between a normal display and a preliminary display. Can be obtained.

  In the said embodiment, although the material of each component, material, the conditions of implementation, etc. are described, these are illustrations and are not restricted to what was described.

  In addition, within the scope of the present invention, the present invention can be freely combined with each embodiment, modified with any component in each embodiment, or omitted with any component in each embodiment.

  1-3 Display device, 10R, 10G, 10B Light source (LED), 11R, 11G, 11B emitted light, 20 synthesis means (dichroic mirror), 30, 32 modulation means (modulation element), 31R, 31G, 31B modulated light, 40 projection means (projection lens), 50 screen, 60 control means, 61R, 61G, 61B, 62, 63 control signal, 70 drive means, 71R, 71G, 71B constant current circuit, 80 modulation drive means, 90 data supply means, 100 operation means, 110 input video signal, 120 normal video data acquisition means, 121 wiring, 122 analog / digital converter, 123 pixel conversion means, 124 normal video data, 140 data calculation means, 160 calculation coefficient storage means, 170 calculation means , 171R, 171G, 171B, 173R, 173G 173B, 175R, 175G, 175B multiplier, 172, 174, 176 adders, 180 selection means, 190 detection unit, D1, RP, GP, BP usually video data, RD, GD, BD preliminary image data.

Claims (4)

Video data acquisition means for acquiring a plurality of video data respectively assigned to a plurality of light sources from an input video signal;
Calculation coefficient storage means for storing a plurality of calculation coefficients corresponding to each of the video data;
Calculation is performed using the calculation coefficient corresponding to each video data extracted from the calculation coefficient storage means and the video data corresponding to the calculation coefficient, and preliminary video data corresponding to each light source is generated. Computing means;
When at least one of the plurality of light sources cannot be turned on, the light emitted from each of the light sources that can be turned on is controlled based on the preliminary image data, and an image using the emitted light is displayed. Control means for causing
The preliminary image data corresponding to each of the light sources corresponds to a value obtained by multiplying each of the plurality of image data by the corresponding operation coefficient, and further taking the sum thereof.
The other light source that can be turned on as the calculation coefficient of the video data corresponding to the other light source that can be turned on in the preliminary image data corresponding to the one light source that can be turned on. The operation coefficient having a value smaller than the operation coefficient of the image data corresponding to the other light sources that can be turned on in the preliminary image data corresponding to the image data is extracted from the operation coefficient storage means. ,
Display device. The calculation means sets 0 from the calculation coefficient storage means as the calculation coefficient of the video data corresponding to the other light sources that can be turned on in the preliminary video data corresponding to the one light source that can be turned on. Characterized by extracting,
The display device according to claim 1. Further comprising detection means for detecting a lighting state of a plurality of the light sources,
The control means controls the emitted light from each of the light sources that can be turned on based on the detection result in the detecting means, and displays an image using the emitted light.
The display device according to claim 1. (A) obtaining a plurality of video data respectively assigned to a plurality of light sources from an input video signal;
(B) a step of storing in advance a plurality of types of calculation coefficients corresponding to each of the video data in the calculation coefficient storage means;
(C) Preliminary video data corresponding to each light source, calculated using the calculation coefficient corresponding to each video data and the video data corresponding to the calculation coefficient extracted from the calculation coefficient storage means Generating
(D) When at least one of the plurality of light sources cannot be turned on, the emitted light from each of the corresponding light sources that can be turned on is controlled based on the preliminary image data, and the emitted light is used. A process of displaying an image,
The preliminary image data corresponding to each of the light sources corresponds to a value obtained by multiplying each of the plurality of image data by the corresponding operation coefficient, and further taking the sum thereof.
In the preliminary image data corresponding to the one light source that can be turned on, the step (c) is used as the calculation coefficient of the video data corresponding to the other light source that can be turned on. Extracting from the calculation coefficient storage means the calculation coefficient having a value smaller than the calculation coefficient of the video data corresponding to the other light source that can be turned on in the preliminary image data corresponding to the light source; It is characterized by
Display method.