JP2005252398A - Display control circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display control circuit capable of presenting a display, while altering the color, brightness and transparency of OSD or a video image, without increasing the capacity of an ROM. <P>SOLUTION: The display control circuit comprises a color pallet selecting circuit 75 and a video image mixing ratio selection circuit 76 for selecting the color pallet and the video image mixing ratio, based on display data S72; a shutter pallet 77; a color mixing circuit 78 and an α value mixing circuit 79 for mixing the outputs from the color pallet selection circuit 75 and video image mixing ratio selecting circuit 76 with the output from the shutter pallet 77; and switching circuits 80, 81, 82 and 83 for delivering the outputs from the color mixing circuit 78 and the α value mixing circuit 79, output from the shutter pallet 77, and outputs from the color pallet selection circuit 75 and the video image mixing ratio selecting circuit 76, while switching, based on a shutter control signal S71 and an OSD output control signal S74. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a circuit for controlling character / graphic display in a display device such as a CRT (Cathode Ray Tube), and in particular, the color, brightness, and transparency of characters and graphics corresponding to changes in display. The present invention relates to a circuit that changes

  Conventionally, a television receiver has an OSD (on-screen display) that reads display data about a channel, a volume, and the like stored in a ROM or the like and displays the information on a display device such as a CRT. . As a method for efficiently switching the display of the CRT or the like, information necessary for switching the display of the CRT or the like is displayed using a function of suppressing the transfer of display data of the OSD according to the setting (hereinafter referred to as a shutter). There are some that do not display the rest (for example, see Patent Document 1).

  A display control circuit having a conventional shutter function will be described below.

  FIG. 9 is a block diagram showing a configuration of a display control circuit having a conventional shutter function.

  As shown in FIG. 9, the conventional display control circuit 100 includes a shutter control signal input terminal 101 to which a shutter control signal S101 indicating an L level is input to the shutter area and an H level is input to areas other than the shutter area, and a ROM ( A display data input terminal 102 to which display data S102 indicating the type of OSD display sequentially read out from (not shown) is input, and n color palettes PLT1 to PLTn in which RGB values indicating the colors of the OSD display are respectively stored. The color palette selection circuit 103 for selecting the color palettes PLT1 to PLTn based on the display data S102, and the n palettes ALP1 to ALPn each storing the ratio α value (video mixture ratio) for mixing the OSD and the video. Then, palettes ALP1 to ALPn are selected based on the display data S102. The output signal from the image mixture ratio selection circuit 104, the output signal from the color palette selection circuit 103 and the shutter control signal S101 are input, the AND circuit 105 that outputs the OSD output signal S105, the output signal from the video mixture ratio selection circuit 104, and And an AND circuit 106 to which the shutter control signal S101 is input and the video mixture ratio output signal S106 is output.

  Next, the operation of the display control circuit shown in FIG. 9 will be described. First, the color palette selection circuit 103 selects one of the color palettes PLT1 to PLTn based on display data S102 sequentially read from a ROM (not shown). The AND circuit 105 performs an AND process on the RGB values of the color palette selected by the color palette selection circuit 103 and the shutter control signal S101, and generates an OSD output signal S105 that forms the color of the OSD characters and graphics. Output.

  On the other hand, the same operation as the RGB value is performed for the video mixture ratio. Specifically, the video mixture ratio selection circuit 104 selects any one of the video mixture ratio palettes ALP1 to ALPn based on the display data S102 sequentially read from the ROM (not shown). Then, the logical product circuit 106 performs a logical product process of the video mixture ratio α value selected by the video mixture ratio selection circuit 104 and the shutter control signal S101 to form a mixture ratio of OSD characters / graphics and video. The video mixture ratio output signal S106 is output.

  Here, the shutter control signal S101 is a signal for setting a shutter region for suppressing OSD display by an arbitrary means and sequentially outputting L level or H level according to the scanning line of the television.

  In order to display the shutter area, an L level shutter control signal S101 is output to the AND circuit 105. In the AND circuit 105, the L level shutter control signal S101 suppresses the RGB value, and the L level OSD output signal S105 is output. Similarly, also in the AND circuit 106, the video mixture ratio α value is suppressed, and the output video mixture ratio output signal S106 becomes L level.

  Further, in order to display the outside of the shutter region, an H level shutter control signal S101 is output to the AND circuit 105. When the H level shutter control signal S101 is input to the logical product circuit 105, the RGB values pass through the logical product circuit 105 and are output as the OSD output signal S105. Similarly, the video mixture ratio α value passes through the AND circuit 106 and is output as a video mixture ratio output signal S106.

  The OSD output signal S105 and the video mixture ratio output signal S106 generated by the operation described above bring the television screen display to the state shown in FIG. FIG. 10 is a diagram illustrating a state of an image displayed on a television screen under the control of a conventional video display circuit.

In FIG. 10, the broken line L indicates the boundary between the shutter area and the non-shutter area (selected area), and at this time, OSD1 that is the area surrounded by the broken line L is a non-shutter area. Is displayed. The OSD is also arranged outside the area surrounded by the broken line L, but these are not displayed on the television screen shown in FIG. 10 because they are located in the shutter area. Note that the range of the shutter area can be flexibly changed by any means, and operations such as displaying the OSD 1 from the middle are possible.
Abstract of JP-A-57-157288

  In the above conventional configuration, there are only two states in which the OSD is displayed if it is in the non-shutter area and is not displayed if it is in the shutter area. The OSD display color, brightness, and transparency in the shutter area can be changed and displayed. Can not. For example, when a menu is displayed on a television screen and a plurality of items are selected with a remote controller, there is a method in which only the selected item is brightened and the surroundings are darkened so that the viewer can easily understand. However, in the conventional configuration, as shown in FIG. 10, OSD1 is displayed, but OSD in the shutter area is not displayed, and thus the display as described above cannot be realized.

  On the other hand, when the shutter function is not used in order to realize the display as described above, two types of OSDs, a bright OSD when selected and a dark OSD when not selected, are necessary. There is a problem that the capacity of the ROM for storing the video mixture ratio palette and the display data increases.

  The present invention is for solving the above-mentioned conventional problems, and without increasing the capacity of a color palette, a video mixture ratio palette, and a ROM for storing display data, the color, brightness, and transparency of the OSD and video can be controlled. An object of the present invention is to provide a display control circuit that enables a changed display.

  A first display control circuit according to the present invention is a display control circuit for displaying an OSD on a television screen, and includes a plurality of color palettes each storing the OSD color data, and the plurality of color palettes. And a plurality of video mixture ratio palettes each storing a video mixture ratio that is a ratio for mixing the color data of the OSD with the video displayed on the television screen. And an OSD output change value based on a video mixture ratio selection circuit for selecting one of the plurality of video mixture ratio palettes and a shutter control signal for designating a shutter area for changing the OSD display. When the OSD output change value is output from the logic circuit that controls whether or not the logic circuit controls the OSD output change value, Changing the color data of the selected color palette serial color palette selection circuit and a calculation circuit.

  Accordingly, the OSD color and brightness in the shutter area can be different from the OSD color in the non-shutter area. That is, since such a display is possible while using the shutter function, the color and brightness of the OSD can be changed without increasing the capacity of the storage device that stores the color palette, the video mixture ratio palette, display data, and the like. It becomes possible.

  The OSD output change value includes an R output change value that changes the R value in the display of the OSD, a G output change value that changes the G value, and a B output change value that changes the B value. As logic circuits, an R value logic circuit that controls the output of the R output change value, a G value logic circuit that controls the output of the G output change value, and a B value that controls the output of the B output change value And an arithmetic circuit for R value that changes the R value of the color palette selected by the color palette selection circuit as an output from the logic circuit for R value, and the color palette. A G value arithmetic circuit for changing the G value of the color palette selected by the selection circuit according to an output from the G value logic circuit, and a B value of the color palette selected by the color palette selection circuit, The output from the use logic circuit may comprise a B value arithmetic circuit for changing. In this case, since R, G, and B in the OSD display in the shutter area can be individually changed, a desired color can be realized.

  Based on the shutter control signal, a video mixing ratio logic circuit that controls whether to output or suppress a video mixing ratio output change value, and the video mixing ratio output change value is output from the video mixing ratio logic circuit. In this case, a video mixing ratio calculation circuit that changes the video mixing ratio selected by the video mixing ratio selection circuit according to the video mixing ratio output change value may be provided. In this case, the transparency of the OSD display in the shutter area can be changed.

  A second display control circuit according to the present invention is a display control circuit for displaying an OSD on a television screen, and includes a plurality of color palettes each storing the OSD color data, and the plurality of color palettes. And a plurality of video mixture ratio palettes each storing a video mixture ratio that is a ratio for mixing the color data of the OSD with the video displayed on the television screen. And a video mixture ratio output change value based on a video mixture ratio selection circuit for selecting one of the plurality of video mixture ratio palettes and a shutter control signal for designating a shutter area for changing the display of the OSD. If the video mixture ratio logic circuit that controls whether to output or suppress, and the video mixture ratio output change value is output from the video mixture ratio logic circuit By the video mixing ratio output variation value, and a calculation circuit for video mixing ratio to change the video mixing ratio selected by the video mixing ratio selection circuit.

  Thereby, the transparency of the OSD in the shutter area can be made different from the transparency of the OSD in the non-shutter area. That is, since such a display is possible while using the shutter function, the color and brightness of the OSD can be changed without increasing the capacity of the storage device that stores the color palette, the video mixture ratio palette, display data, and the like. It becomes possible.

  A third display control circuit of the present invention is a display control circuit for displaying an OSD on a television screen, and a plurality of color palettes each storing the OSD color data, and the plurality of color palettes. A plurality of video mixings each storing a color palette selection circuit for selecting one of them, and a video mixing ratio which is a ratio for mixing the color data displayed on the OSD with the video displayed on the television screen The video mixture ratio selection circuit based on a ratio palette, a video mixture ratio selection circuit for selecting one of the plurality of video mixture ratio palettes, and a shutter control signal for designating a shutter area for changing the display of the OSD. A switching circuit that switches between a video mixing ratio output from the circuit and a video mixing ratio in the shutter region;

  Thereby, the transparency of the OSD and video in the shutter area can be different from that in the case outside the shutter area.

  A fourth display control circuit of the present invention is a display control circuit for displaying an OSD on a television screen, and a plurality of color palettes each storing the OSD color data, and the plurality of color palettes. A plurality of video mixings each storing a color palette selection circuit for selecting one of them, and a video mixing ratio which is a ratio for mixing the color data displayed on the OSD with the video displayed on the television screen Ratio palette, a video mixture ratio selection circuit for selecting one of the plurality of video mixture ratio palettes, and a shutter color palette for storing color data for a shutter area, which is an area for changing the display of the OSD A shutter image mixing ratio palette storing the image mixing ratio for the shutter area, and a color selected by the color palette selecting circuit. A color mixing circuit for mixing the color data of the palette and the color data of the shutter color palette, a first switching circuit for switching between an output from the color mixing circuit and an output of the shutter color palette; A second switching circuit that switches between an output of the color palette selection circuit and an output of the first switching circuit based on a shutter control signal designating the shutter area, and outputs the OSD output signal; and the video A video mixing ratio mixing circuit that mixes the video mixing ratio selected by the mixing ratio selection circuit with the video mixing ratio for shutter, an output of the video mixing ratio mixing circuit, and an output of the video mixing ratio for shutter A third switching circuit for switching, a fourth switching circuit for switching between the output of the video mixing ratio selection circuit and the output of the third switching circuit; That.

  Thereby, the color and transparency of the video and OSD in the shutter area can be made different from those in the case outside the shutter area.

  The operation of the display control circuit in this case will be described in detail. When displaying the OSD in the shutter area, the output from the color mixing circuit is selected in the first switching circuit, and the second When the output from the first switching circuit is selected in the switching circuit and the image in the shutter area is displayed, the output of the shutter color palette is selected in the first switching circuit, and the second When the output from the first switching circuit is selected in the switching circuit and the outside of the shutter area is displayed, the output of the color palette selection circuit is selected in the second switching circuit.

  The operation of the display control circuit in this case will be described in detail. When displaying the OSD in the shutter area, the output from the color mixing circuit is selected in the first switching circuit, and the second In the switching circuit, the output from the first switching circuit is selected, in the third switching circuit, the output from the video mixing ratio mixing circuit is selected, and in the fourth switching circuit, the output from the third switching circuit is selected. When the image in the shutter area is displayed, the output of the shutter color palette is selected in the first switching circuit, and the first switching circuit is selected in the second switching circuit. Output from the third switching circuit, the output of the shutter video mixing ratio palette is selected in the third switching circuit, and the output from the third switching circuit in the fourth switching circuit. When selecting and displaying outside the shutter region, the output of the color palette selection circuit is selected in the second switching circuit, and the output of the video mixture ratio selection circuit is selected in the fourth switching circuit. .

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of a display control circuit according to the first embodiment of the present invention. As shown in FIG. 1, the display control circuit 10 of the present embodiment includes a shutter control signal input terminal 11 to which a shutter control signal S11 indicating an L level is input to the shutter area and an H level is input to other areas than the shutter area. A display data input terminal 12 that is sequentially read from a ROM (not shown) and receives display data S12 indicating the type of OSD display; an OSD output change value input terminal 13 that receives an OSD output change value S13; A logical product circuit 14 that performs a logical product process of the inverted value of the shutter control signal S11 and the OSD output change value S13, n color palettes PLT1 to PLTn each storing RGB values indicating colors of the OSD display, and a display Color palette selection circuit 16 for selecting color palettes PLT1 to PLTn based on data S12, and color palette selection The subtraction circuit 15 that subtracts the value of the output signal of the AND circuit 14 from the value of the output signal of the path 16 and the α value (video mixing ratio) that is a ratio for mixing the OSD display and the video are respectively stored. Each of the palettes ALP1 to ALPn and a video mixture ratio selection circuit 17 that selects the palettes ALP1 to ALPn based on the display data S12 and outputs a video mixture ratio output signal S17 are provided.

  A feature of the display control circuit of the first embodiment is that it includes an OSD output change value input terminal 13 to which the OSD output change value S13 is input, a logical product circuit 14 and a subtraction circuit 15.

  Next, the operation of the display control circuit shown in FIG. 1 will be described. First, when the OSD output change value S13 is input to the OSD output change value input terminal 13, the logical product circuit 14 performs a logical product process on the signal obtained by inverting the shutter control signal S11 and the OSD output change value S13. Here, the OSD output change value S13 may be a preset constant value stored in a storage unit (not shown) such as a ROM, or may be changed according to a change in display on the screen. It may be a variable value set by a program in a computer or the like or set by a communication device or the like. The shutter control signal S11 is a signal that sequentially outputs an L level or an H level in accordance with a scanning line of the television in order to display a shutter area for suppressing OSD display on the screen. On the other hand, the color palette selection circuit 16 selects one of the color palettes PLT1 to PLTn based on the display data S12 sequentially read from the ROM (not shown). Then, the subtracting circuit 15 subtracts the output value from the AND circuit 14 from the RGB value output from the color palette selecting circuit 16 to generate the OSD output signal S15 for forming the color of the OSD character or figure as a CRT. To a display device (not shown) or a circuit (not shown) that mixes the video signal and the OSD.

  More specifically, an L level shutter control signal S11 is input to the shutter control signal input terminal 11 in order to display the shutter area. Since the AND circuit 14 inverts the shutter control signal S11 to the H level, the OSD output change value S13 is output to the subtraction circuit 15 as it is. On the other hand, the color palette selection circuit 16 selects one of the color palettes PLT1 to PLTn based on the display data S12. The subtraction circuit 15 subtracts the OSD output change value S13 output from the AND circuit 14 from the RGB value of the color palette selected by the color palette selection circuit 16, and uses the subtraction result as an OSD output signal S15 such as CRT. The data is output to a display device (not shown) or a circuit (not shown) that mixes the video signal and the OSD.

  On the other hand, in order to display a non-shutter region, an H level shutter control signal S11 is input to the shutter control signal input terminal 11. Since the AND circuit 14 inverts the shutter control signal S11 to the L level, the OSD output change value S13 is suppressed, and an L level signal is output to the subtraction circuit 15. When the L level signal from the AND circuit 14 is input to the subtraction circuit 15, the subtraction process is not performed, and the RGB value input from the color palette selection circuit 16 passes and is output as the OSD output signal S15. .

  The video mixture ratio selection circuit 17 selects any one of the video mixture ratio palettes ALP1 to ALPn based on the display data S12 sequentially read from the ROM, and sets the OSD character / graphic / video mixture ratio. The video mixture ratio output signal S17 to be formed is output to a display device (not shown) such as a CRT or a circuit (not shown) that mixes the video signal and the OSD.

  The OSD output signal S15 generated by the operation described above brings the television screen into the state shown in FIG. FIG. 2 is a diagram illustrating a state of an image displayed on the television screen under the control of the display control circuit in the first embodiment.

  In FIG. 2, the broken line L indicates the boundary between the shutter area and the non-shutter area, the area surrounded by the broken line is the non-shutter area, and the outside of the area surrounded by the broken line L is the shutter area. In this state, the OSDs 2 and 3 positioned in the shutter area are displayed in a darker state than the OSD 1 positioned in the non-shutter area. This is because the RGB value is supplied as it is to the non-shutter region, whereas the value obtained by subtracting the OSD output change value S13 from the RGB value is supplied to the shutter region. Note that the range of the shutter area can be flexibly changed by an arbitrary circuit, and operations such as changing the brightness of the OSDs 1 to 3 on the way are possible.

  In this embodiment, in addition to the subtraction circuit 15, a division circuit that performs division can be used.

(Second Embodiment)
FIG. 3 is a block diagram showing the configuration of the display control circuit according to the second embodiment of the present invention. As shown in FIG. 3, the display control circuit 30 of the present embodiment includes a shutter control signal input terminal 31 to which a shutter control signal S31 indicating an L level is input into the shutter area and an H level is input outside the shutter area. A display data input terminal 32 to which display data S32 indicating the type of OSD display sequentially read from a ROM (not shown) is input, and an R output change value input terminal 33R to which an R output change value is input among RGB values; The G output change value input terminal 33G to which the G output change value is input, the B output change value input terminal 33B to which the B output change value is input, and the α output change value to which the change value of the video mixture ratio α is input. Logical product times for performing logical product processing of the input terminal 33α, the inverted value of the shutter control signal S31, the R output change value, the G output change value, the B output change value, and the video mixture ratio α. 34R, 34G, 34B, 34α, n color palettes PLT1 to PLTn each storing RGB values indicating colors of OSD display, and a color palette selection circuit for selecting color palettes PLT1 to PLTn based on display data S32 36, subtracting circuits 35R, 35G, 35B for subtracting the value of the output signal of the AND circuits 34R, 34G, 34B from the value of the output signal of the color palette selection circuit 36, and the value of the video mixture ratio α are stored. n palettes ALP1 to ALPn, a video mixture ratio selection circuit 37 for selecting the palettes ALP1 to ALPn based on the display data S32, and the output signal value of the AND circuit 34α from the output signal value of the video mixture ratio selection circuit 37. A subtracting circuit 35α for subtracting the value.

  In this embodiment, instead of providing the OSD output change value input terminal 13 in the first embodiment, an R output change value input terminal 33R, a G output change value input terminal 33G, a B output change value input terminal 33B, By providing the α output change value input terminal 33α, it is possible to individually change the R value, G value, B value indicating the OSD display color and the α value indicating the video mixture ratio.

  Next, the operation of the display control circuit shown in FIG. 3 will be described. First, the R output change value, the G output change value, and the B output change value are input to the R output change value input terminal 33R, the G output change value input terminal 33G, and the B output change value input terminal 33B, respectively. Here, the R output change value, the G output change value, and the B output change value may be predetermined constant values stored in a storage unit (not shown) such as a ROM, or a screen. As the display changes, a variable value set by a program in a microcomputer or the like or set by a communication device or the like may be used. In each of the logical product circuits 34R, 34G, and 34B, a logical product process of the inverted value of the shutter control signal S31 and the R output change value, the G output change value, and the B output change value is performed. On the other hand, the color palette selection circuit 36 selects one of the color palettes PLT1 to PLTn based on the display data S32 sequentially read from the ROM (not shown). Then, in the subtraction circuits 35R, 35G, and 35B, the R output change value and the G output that are output from the AND circuits 34R, 34G, and 34B from the R value, the G value, and the B value that are output from the color palette selection circuit 36, respectively. The change value and the B output change value are subtracted. A signal obtained by combining the outputs of the subtracting circuits 35R, 35G, and 35B is output as the OSD output signal S38.

  On the other hand, an α output change value is input to the α output change value input terminal 33α. Here, the α output change value may be a predetermined constant value stored in a storage unit (not shown) such as a ROM, or the microcomputer is changed in accordance with a change in display on the screen. Or a variable value set by a communication device or the like. Then, the logical product circuit 34α performs a logical product process of the inverted value of the shutter control signal S31 and the α output change value. On the other hand, the video mixture ratio selection circuit 37 selects one of the palettes ALP1 to ALPn based on the display data S32. Then, the subtraction circuit 35α subtracts the value calculated by the AND circuit 34α from the output signal of the video mixture ratio selection circuit 37.

  More specifically, in order to display the shutter area, an L level shutter control signal S31 is input to the shutter control signal input terminal 31. Since the AND circuits 34R, 34G, and 34B invert the shutter control signal S31 to the H level, the R output change value, the G output change value, and the B output change value are output as they are to the subtraction circuits 35R, 35G, and 35B. Is done. Further, the color palette selection circuit 36 selects any one of the color palettes PLT1 to PLTn based on the display data S32. In the subtraction circuits 35R, 35G, and 35B, the R output change value and G output from the AND circuits 34R, 34G, and 34B are obtained from the R value, G value, and B value of the color palette selected by the color palette selection circuit 36. The change value and the B output change value are subtracted, and the subtraction result is output as the OSD output signal S38.

  Also in the AND circuit 34α, since the shutter control signal S31 is inverted to the H level, the α output change value is output to the subtraction circuit 35α as it is. The video mixture ratio selection circuit 37 selects one of the palettes ALP1 to ALPn based on the display data S32. The subtraction circuit 35α subtracts the α output change value from the video mixture ratio α selected by the video mixture ratio selection circuit 37, and outputs the subtraction result as a video mixture ratio output signal S39.

  On the other hand, in order to display the non-shutter region, an H level shutter control signal S31 is input to the shutter control signal input terminal 31. Since the AND circuits 34R, 34G, 34B invert the shutter control signal S31 to the L level, the R output change value, the G output change value, and the B output change value are suppressed, and the subtraction circuits 35R, 35G, 35B have L A level signal is output. When an L level signal is input to the subtraction circuits 35R, 35G, and 35B, the subtraction process is not performed, and the R value, the G value, and the B value input from the color palette selection circuit 36 pass, and the OSD output signal S38. Is output as

  Also in the AND circuit 34α, since the shutter control signal S31 is inverted to the L level, the α output change value is suppressed, and an L level signal is output to the subtraction circuit 35α. When an L level signal is input to the subtraction circuit 35α, the subtraction process is not performed, and the video mixture ratio α selected by the video mixture ratio selection circuit 37 passes and is output as the video mixture ratio output signal S39.

  The OSD output signal S38 and the video mixture ratio output signal S39 generated by the operation described above bring the television screen into the state shown in FIG. FIG. 4 is a diagram illustrating a state of an image displayed on the television screen under the control of the display control circuit in the second embodiment.

  In FIG. 4, the broken line L indicates the boundary between the shutter area and the non-shutter area, and the area surrounded by the broken line is the non-shutter area, and the outside of the area surrounded by the broken line is the shutter area. In this state, unlike the transparency of OSD1 in the non-shutter area and the transparency of OSD2 and OS3 in the shutter area, the images on the back surfaces of OSD1 to OSD3 are more largely reflected in OSD2 and OSD1 than in OSD1. In FIG. 4, the back image is not reflected on the OSD 1, but this is an example of display, and it is only necessary that the back image is reflected on the OSD 1 with a different transparency from the OSD displays 2 and 3. Here, although not shown, the OSDs 2 and 3 are colored in a different color from the OSD 1.

  As described above, in this embodiment, the colors and transparency of the OSDs 2 and 3 located in the shutter region are different from those in the non-shutter region. This is because the RGB value and the video mixture ratio α are supplied as they are to the non-shutter region, whereas the R output change value and the G output change value are respectively obtained from the R value, the G value, and the B value in the shutter region. This is because the value obtained by subtracting each of the B value output change value and the value obtained by subtracting the α output change value from the video mixing ratio α is supplied. Note that the range of the shutter area can be flexibly changed by an arbitrary circuit, and operations such as changing the colors and transparency of the OSDs 1 to 3 on the way are possible.

  In the present embodiment, a division circuit that performs division can be used instead of the subtraction circuits 35R, 35G, 35B, and 35α.

  In the present embodiment, the R value, G value, B value, and α value are independently changed. However, the present invention changes the R value, G value, and B value independently of each other. Thus, the present invention can also be applied to a form in which the α value is not changed and only an α value is changed.

(Third embodiment)
FIG. 5 is a block diagram showing the configuration of the display control circuit in the third embodiment of the present invention. As shown in FIG. 5, the display control circuit 50 according to the present embodiment is sequentially read from a ROM (not shown), and a display data input terminal 52 to which display data S52 indicating the type of OSD display is input. Mixing n color palettes PLT1 to PLTn each storing RGB values indicating display colors, color palette selection circuit 54 for selecting color palettes PLT1 to PLTn based on display data S52, OSD display and video From the n pallets ALP1 to ALPn each storing an α value that is a ratio to be selected, a video mixing ratio selection circuit 55 for selecting the pallets ALP1 to ALPn based on the display data S52, and a video mixing ratio selection circuit 55 A shutter image mixture ratio input terminal 53 to which a signal and a shutter image mixture ratio S53 are input, and a shutter In response to the shutter control signal input terminal 51 to which the shutter control signal S51 indicating the L level is input in the area and the H level in the area other than the shutter area, and the shutter control signal S51, the signal from the video mixture ratio selection circuit 55 is received. And a switching circuit 56 for switching between the shutter image mixing ratio S53.

  The display control circuit according to the third embodiment is characterized in that a shutter video mixing ratio input terminal 53 and a switching circuit 56 are provided, and an output signal from the video mixing ratio selection circuit 55 is output based on the shutter control signal S51. The point is to switch to the ratio S53.

  Next, the operation of the display control circuit shown in FIG. 5 will be described. First, the color palette selection circuit 54 selects one of the color palettes PLT1 to PLTn based on the display data S52 sequentially read from the ROM, and outputs an OSD output signal S54 for forming OSD characters and colors. Output.

  On the other hand, the video mixture ratio selection circuit 55 also selects one of the video mixture ratio palettes ALP1 to ALPn based on the display data S52. Then, the switching circuit 56 switches between the video mixture ratio α selected by the video mixture ratio selection circuit 55 and the shutter video mixture ratio S53 based on the shutter control signal S51, and outputs it as a video mixture ratio output signal S56. . Here, the shutter image mixing ratio S53 may be a predetermined constant value stored in a storage unit (not shown) such as a ROM, or as the display on the screen changes, It may be a variable value set by a program in a microcomputer or the like, or set by a communication device or the like.

  More specifically, in order to display the shutter area, an L level shutter control signal S51 is input to the shutter control signal input terminal 51. Then, the switching circuit 56 selects the shutter video mixing ratio S53 based on the shutter control signal S51, and outputs a video mixing ratio output signal S56.

  On the other hand, in order to display the non-shutter region, an H level shutter control signal S51 is input to the shutter control signal input terminal 51. Then, the switching circuit 56 selects the video selection ratio α from the video mixing ratio selection circuit 55 based on the shutter control signal S51, and outputs the video mixing ratio output signal S56.

  The video mixture ratio output signal S56 generated by the operation described above brings the television screen into the state shown in FIG. FIG. 6 is a diagram illustrating a state of an image displayed on the television screen under the control of the display control circuit in the third embodiment.

In FIG. 6, the broken line L indicates the boundary between the shutter area and the non-shutter area, and the area surrounded by the broken line is the non-shutter area, and the outside of the area surrounded by the broken line is the shutter area. In this state, unlike the transparency of OSD1 in the non-shutter area and the transparency of OSD2 and OS3 in the shutter area, the images on the back surfaces of OSD1 to OSD3 are more largely reflected in OSD2 and OSD1 than in OSD1. In FIG. 6, the back image is not reflected on the OSD 1, but this is an example of the display, and it is only necessary that the back image is reflected on the OSD 1 with a different transparency from the OSD displays 2 and 3.
Although not shown in the figure, the transparency of the gradation video PIC1 in the shutter region is higher than that in the case where the image is located outside the shutter region.

  As described above, in the present embodiment, the OSDs 2 and 3 located in the shutter area are displayed with a different transparency from the OSD 1 located in the non-shutter area. In the present embodiment, not only the OSD display but also the transparency of the video PIC1 in the shutter area can be different from that in the case outside the shutter area.

  Note that the range of the shutter area can be flexibly changed, and operations such as changing the OSDs 1 to 3 and the transparency of the video on the way are possible.

(Fourth embodiment)
FIG. 7 is a block diagram showing a configuration of a display control circuit according to the fourth embodiment of the present invention. As shown in FIG. 7, the display control circuit 70 according to the present embodiment includes a shutter control signal input terminal 71 to which a shutter control signal S71 indicating an L level is input to the shutter area and an H level is input to areas other than the shutter area. Display data input terminal 72 to which display data S72 indicating the type of OSD display sequentially read from a ROM (not shown) is input, OSD output mixture ratio input terminal 73 to which OSD output mixture ratio S73 is input, and OSD output An OSD output control signal input terminal 74 to which a control signal S74 is input, n color palettes PLT01 to PLTn in which RGB values indicating OSD display colors are stored, and color palettes PLT1 to PLTn based on display data S72. A color palette selection circuit 75 for selecting the image, and n patterns in which the value of the video mixture ratio α is stored. ALP1 to ALPn, a video mixture ratio selection circuit 76 for selecting palettes ALP1 to ALPn based on display data S72, a shutter palette 77 having a shutter color palette PLT11 and a shutter video mixture ratio palette ALP11 The color mixing circuit 78 for synthesizing the RGB values selected by the color palette selection circuit 75 and the RGB values of the shutter color palette PLT11, the video mixing ratio α selected by the video mixing ratio selection circuit 76, and the shutter video mixing. An α value mixing circuit 79 that synthesizes the video mixture ratio α value of the ratio palette ALP11, and a first that switches between the output signal of the color mixing circuit 78 and the RGB value of the shutter color palette PLT11 based on the OSD output control signal S74. Switching circuit 80 and the shutter control signal S71 Based on the OSD output control signal S74, the second switching circuit 82 for switching the output signal of the color palette selection circuit 75 and the output signal of the first switching circuit 80, and the output signal of the α value mixing circuit 79 and the shutter signal A third switching circuit 81 that switches the video mixing ratio α of the video mixing ratio palette ALP11, and an output signal of the video mixing ratio selection circuit 76 and an output signal of the third switching circuit 81 based on the shutter control signal S71. And a fourth switching circuit 83 for switching.

Next, the operation of the display control circuit shown in FIG. 7 will be described. First, the color palette selection circuit 75 selects one of the color palettes PLT1 to PLTn based on the display data S72 sequentially read from the ROM, and outputs RGB ₁ for forming OSD characters and colors. . Then, based on the OSD output mixing ratio S73, the color mixing circuit 78 combines RGB ₁ selected by the color palette selection circuit 75 and RGB ₂ stored in the shutter color palette PLT11 to obtain RGB ₃ . Output. For example, when the OSD output mixing ratio S73 is β, the color mixing circuit 78 outputs RGB ₃ of the following equation (1).

RGB ₃ = RGB ₁ × β + RGB ₂ × (1-β) (1)
Then, the first switching circuit 80 switches between RGB ₃ output from the color mixing circuit 78 and RGB ₂ of the shutter color palette PLT11 based on the OSD output control signal S74, and outputs RGB ₄ . Further, the second switching circuit 82 switches between RGB ₁ selected by the color palette selection circuit 75 and RGB ₄ output from the first switching circuit 80 based on the shutter control signal S71, and thereby the character of the OSD. And an OSD output signal S82 for forming a figure color.

On the other hand, the video mixing ratio selection circuit 76, based on the display data S72, and selects one of the video mixing ratio pallet ALP1～ALPn, outputs a video selection ratio alpha _1. Then, the α value mixing circuit 79, based on the OSD output mixing ratio S73, the video mixing ratio α ₁ selected by the video mixing ratio selection circuit 76 and the video mixing ratio stored in the shutter video mixing ratio palette ALP11. The image mixing ratio α ₃ is output by combining α ₂ . For example, if the value of the OSD output mixing ratio S73 is β may, alpha value mixing circuit 79 outputs the video mixing ratio alpha ₃ represented by the following equation (2).

α ₃ = α ₁ × β + α ₂ × (1-β) (2)
The third switching circuit 81, based on the OSD output control signal S74, a video mixing ratio alpha ₃ output from the alpha value mixing circuit 79, a video mixing ratio alpha ₂ of the shutter video mixing ratio pallet ALP11 And the video mixture ratio α ₄ is output. Further, the fourth switching circuit 83, based on the shutter control signal S71, the video mixing ratio α ₁ selected by the video mixing ratio selection circuit 76 and the video mixing ratio α ₄ output from the third switching circuit 81. Are switched to output a video mixing ratio output signal S83 that forms a mixing ratio between the OSD characters and graphics and the video.

More specifically, in order to display the OSD display in the shutter area, the L level shutter control signal S71 is input to the shutter control signal input terminal 71, and the OSD output control signal input terminal 74 is at the H level. An OSD output control signal S74 is input. When the OSD output control signal S74 at H level is input to the first switching circuit 80, RGB ₃ output from the color mixing circuit 78 is selected and output as RGB ₄ . When the L-level shutter control signal S71 is input to the second switching circuit 82, RGB ₄ is selected and output as the OSD output signal S82. That is, when there is OSD display in the shutter area, RGB ₃ synthesized by the color mixing circuit 78 is output as the OSD output signal S82.

When the OSD output control signal S74 at H level is input to the third switching circuit 81, α ₃ output from the α value mixing circuit 79 is selected and output as α ₄ . When the L level shutter control signal S71 is input to the fourth switching circuit 83, α ₄ output from the third switching circuit 81 is selected and output as the video mixture ratio output signal S83. That is, in order to display the OSD display in the shutter area, α ₃ synthesized by the α value mixing circuit 79 is output as the video mixture ratio output signal S83.

On the other hand, in order to display an image in the shutter region, an L level shutter control signal S71 is input to the shutter control signal input terminal 71, and an L level OSD output control signal S74 is input to the OSD output control signal input terminal 74. To do. When the first switching to circuit 80 of L level OSD output control signal S74 is input, RGB ₂ stored in the shutter color palette PLT11 is selected and output as the RGB _3. When the L-level shutter control signal S71 is input to the second switching circuit 82, RGB ₄ that is the output signal of the first switching circuit 80 is selected and output as the OSD output signal S82. That is, in order to display an image in the shutter area, RGB ₂ stored in the shutter color palette PLT11 is output as the OSD output signal S82.

When the L-level OSD output control signal S74 is input to the third switching circuit 81, α ₂ stored in the shutter video mixing ratio palette ALP11 is selected and output as α ₄ . When the L-level shutter control signal S71 is input to the fourth switching circuit 83, α ₄ that is the output signal of the third switching circuit 81 is selected and output as the video mixture ratio output signal S83. That is, in order to display the image in the shutter area, α ₂ stored in the shutter image mixture ratio palette ALP11 is output as the image mixture ratio output signal S83.

On the other hand, in order to display an area outside the shutter area, an H level shutter control signal S 71 is input to the shutter control signal input terminal 71. When an H level shutter control signal S71 is input to the second switching circuit 82, RGB ₁ selected by the color palette selection circuit 75 is selected and output as an OSD output signal S82. When the H level shutter control signal S71 is input to the fourth switching circuit 83, α ₁ selected by the video mixing ratio selection circuit 76 is selected and output as the video mixing ratio output signal S83. When displaying the shutter area, the results of the OSD output signal S82 and the video mixture ratio output signal S83 are not affected by the H / L of the OSD output control signal S74.

  The OSD output signal S82 and the video mixture ratio output signal S83 generated by the operation described above bring the television screen into the state shown in FIG. FIG. 8 is a diagram illustrating a state of an image displayed on the television screen under the control of the display control circuit in the fourth embodiment.

In FIG. 8, the broken line L indicates the boundary between the shutter area and the non-shutter area, the area surrounded by the broken line L is the non-shutter area, and the outside of the area surrounded by the broken line L is the shutter area. . In this state, the colors and transparency of the OSDs 2 and 3 in the shutter area are different from the colors and transparency when they are outside the shutter area. This is because the OSD output signal S82 for displaying the OSDs 2 and 3 in the shutter area is a mixture of RGB ₁ and RGB _{2 of the} shutter palette 77 in the color mixing circuit 78, and the video mixing ratio output signal S83. This is because α ₁ and α _{2 of the} shutter palette 77 are mixed in the video mixture ratio selection circuit 76.

In this state, the color and transparency of the video in the shutter area are also different from the color and transparency of the video in the case outside the shutter area. This is because the OSD output signal S82 for displaying the video PIC1 in the shutter area is RGB ₂ of the shutter palette 77, and the video mixture ratio output signal S83 is α ₂ of the shutter palette 77.

  As described above, in the present embodiment, the OSD and video RGB values and the video mixture ratio α value in the shutter area can be different from those in the non-shutter area.

  Note that the range of the shutter area can be flexibly changed by an arbitrary circuit, and operations such as changing the transparency of the OSDs 1 to 3 and the video on the way are possible.

The RGB values PLT1 to PLTn of the color palette described in the first to fourth embodiments, the video mixture ratio α values ALT1 to ALTn of the video mixing ratio palette, the shutter video mixing ratio α ₂ , and the RGB _{2 of the} shutter palette. As a circuit for setting the video mixing ratio α ₂ , a circuit for setting the value by a program using a microcomputer or the like, a circuit for setting the value by a communication device or the like can be considered.

  In the first to fourth embodiments, various input terminals are described as means for inputting signals, but these input terminals may not be provided.

  Since the display control circuit according to the present invention has a control circuit that changes the OSD display and the color, brightness, and transparency of the image according to the setting, it is useful as a method for efficiently switching display such as CRT.

It is a block diagram which shows the structure of the display control circuit in the 1st Embodiment of this invention. It is a figure which shows the state of the image displayed on a television screen by control of the display control circuit in 1st Embodiment. It is a block diagram which shows the structure of the display control circuit in the 2nd Embodiment of this invention. It is a figure which shows the state of the image displayed on a television screen by control of the display control circuit in 2nd Embodiment. It is a block diagram which shows the structure of the display control circuit in the 3rd Embodiment of this invention. It is a figure which shows the state of the image displayed on a television screen by control of the display control circuit in 3rd Embodiment. It is a block diagram which shows the structure of the display control circuit in the 4th Embodiment of this invention. It is a figure which shows the state of the image displayed on a television screen by control of the display control circuit in 4th Embodiment. It is a block diagram which shows the structure of the display control circuit which has the conventional shutter function. It is a figure which shows the state of the image displayed on a television screen by control of the conventional video display circuit.

Explanation of symbols

10 Display control circuit
11 Shutter control signal input terminal
12 Display data input terminal
13 OSD output change value input terminal
14 AND circuit
15 Subtraction circuit
16 Color palette selection circuit
17 Video mixing ratio selection circuit
30 Display control circuit
31 Shutter control signal input terminal
32 Display data input terminal
33α α value change input terminal
33R R output change value input terminal
33G G output change value input terminal
33B B output change value input terminal
34R, 34G, 34B, 34α AND circuit
35R, 35G, 35B, 35α subtraction circuit
36 Color palette selection circuit
37 Video mixing ratio selection circuit
50 Display control circuit
51 Shutter control signal input terminal
52 Display data input terminal
53 Video mixing ratio input terminal for shutter
54 Color palette selection circuit
55 Video mixing ratio selection circuit
56 switching circuit
70 Display control circuit
71 Shutter control signal input terminal
72 Display data input terminal
73 OSD output mixing ratio input terminal
74 OSD output control signal input terminal
75 Color palette selection circuit
76 Video mixing ratio selection circuit
77 Shutter palette
78 color mixing circuit
79 α value mixing circuit
80 First switching circuit
81 Third switching circuit
82 Second switching circuit
83 Fourth switching circuit

Claims (7)

A display control circuit for displaying an OSD on a television screen,
A plurality of color palettes each storing the OSD color data;
A color palette selection circuit for selecting one of the plurality of color palettes;
A plurality of video mixing ratio palettes each storing a video mixing ratio, which is a ratio of mixing the color data of the OSD with the video displayed on the television screen;
A video mixing ratio selection circuit for selecting one of the plurality of video mixing ratio palettes;
A logic circuit that controls whether to output or suppress an OSD output change value based on a shutter control signal that designates a shutter region for changing the display of the OSD;
A display control circuit comprising: an arithmetic circuit that changes color data of the color palette selected by the color palette selection circuit according to the OSD output change value when the OSD output change value is output from the logic circuit; . The display control circuit according to claim 1,
The OSD output change value includes an R output change value that changes the R value in the display of the OSD, a G output change value that changes the G value, and a B output change value that changes the B value.
As the logic circuit, an R value logic circuit that controls the output of the R output change value, a G value logic circuit that controls the output of the G output change value, and a B that controls the output of the B output change value. A logic circuit for value,
As the arithmetic circuit, an R value arithmetic circuit for changing the R value of the color palette selected by the color palette selection circuit according to an output from the R value logic circuit, and a color selected by the color palette selection circuit. The G value arithmetic circuit for changing the G value of the palette by the output from the G value logic circuit and the B value of the color palette selected by the color palette selection circuit are output from the B value logic circuit. A display control circuit comprising a B-value arithmetic circuit that is changed according to The display control circuit according to claim 1 or 2,
A video mixing ratio logic circuit that controls whether to output or suppress the video mixture ratio output change value based on the shutter control signal;
When the video mixture ratio output change value is output from the video mixture ratio logic circuit, the video mixture ratio that changes the video mixture ratio selected by the video mixture ratio selection circuit according to the video mixture ratio output change value. A display control circuit comprising an arithmetic circuit for operation. A display control circuit for displaying an OSD on a television screen,
A plurality of color palettes each storing the OSD color data;
A color palette selection circuit for selecting one of the plurality of color palettes;
A plurality of video mixing ratio palettes each storing a video mixing ratio, which is a ratio of mixing the color data of the OSD with the video displayed on the television screen;
A video mixing ratio selection circuit for selecting one of the plurality of video mixing ratio palettes;
A video mixture ratio logic circuit that controls whether to output or suppress a video mixture ratio output change value based on a shutter control signal that specifies a shutter region for changing the display of the OSD;
When the video mixture ratio output change value is output from the video mixture ratio logic circuit, the video mixture ratio that changes the video mixture ratio selected by the video mixture ratio selection circuit according to the video mixture ratio output change value. A display control circuit comprising an arithmetic circuit for operation. A display control circuit for displaying an OSD on a television screen,
A plurality of color palettes each storing the OSD color data;
A color palette selection circuit for selecting one of the plurality of color palettes;
A plurality of video mixing ratio palettes each storing a video mixing ratio, which is a ratio of mixing the color data of the display of the OSD with the video displayed on the television screen;
A video mixing ratio selection circuit for selecting one of the plurality of video mixing ratio palettes;
A display circuit comprising: a switching circuit that switches between a video mixing ratio output from the video mixing ratio selection circuit and a video mixing ratio in the shutter area based on a shutter control signal that designates a shutter area for changing the display of the OSD. Control circuit. A display control circuit for displaying an OSD on a television screen,
A plurality of color palettes each storing the OSD color data;
A color palette selection circuit for selecting one of the plurality of color palettes;
A plurality of video mixing ratio palettes each storing a video mixing ratio, which is a ratio of mixing the color data of the display of the OSD with the video displayed on the television screen;
A video mixing ratio selection circuit for selecting one of the plurality of video mixing ratio palettes;
A shutter color palette in which color data for a shutter area, which is an area for changing the display of the OSD, is stored;
A shutter image mixing ratio palette in which the image mixing ratio for the shutter area is stored;
A color mixing circuit that mixes the color data of the color palette selected by the color palette selection circuit and the color data of the shutter color palette;
A first switching circuit for switching between the output from the color mixing circuit and the output of the shutter color palette;
A second switching circuit that switches between an output of the color palette selection circuit and an output of the first switching circuit based on a shutter control signal designating the shutter area, and outputs an OSD output signal;
A video mixing ratio mixing circuit for mixing the video mixing ratio selected by the video mixing ratio selection circuit and the video mixing ratio for the shutter;
A third switching circuit for switching between the output of the video mixing ratio mixing circuit and the output of the shutter video mixing ratio;
A display control circuit comprising: a fourth switching circuit that switches between an output of the video mixing ratio selection circuit and an output of the third switching circuit. The display control circuit according to claim 6,
When displaying the OSD in the shutter area, the output from the color mixing circuit is selected in the first switching circuit, and the output from the first switching circuit is selected in the second switching circuit. Selecting the output from the video mixing ratio mixing circuit in the third switching circuit, selecting the output from the third switching circuit in the fourth switching circuit,
When displaying an image in the shutter area, the output of the shutter color palette is selected in the first switching circuit, and the output from the first switching circuit is selected in the second switching circuit. Selecting the output of the shutter video mixing ratio palette in the third switching circuit, selecting the output from the third switching circuit in the fourth switching circuit,
When displaying outside the shutter area, the second switching circuit selects the output of the color palette selection circuit, and the fourth switching circuit selects the output of the video mixture ratio selection circuit. circuit.

Images