JP4731862B2 - Display device - Google Patents

Description

  The present invention relates to a display device such as a liquid crystal projector that performs image inversion processing.

  2. Description of the Related Art Conventionally, a liquid crystal projector that receives a video signal from a video or PC and projects the video on a screen or the like has been developed as a display device that displays video. There are various installation methods, such as installation on the front of the screen when viewed from the user, installation on the back of the screen, installation by hanging from the ceiling, etc. The orientation of the image is inverted up and down, left and right, and up and down and left and right. Therefore, in such a display device, a display inversion setting function by the user is essential.

  The liquid crystal projector has various parameters set by the user, including image quality adjustment settings such as contrast and brightness. Normally, such parameters are often set by an OSD (On Screen Display) menu screen that displays images, options, and messages superimposed on a video. It is desirable that this menu screen can be easily set with a limited number of buttons even if the number of parameters increases.

  The liquid crystal projector also has many parameters that need to be notified to the user, such as the frequency of the input video signal. Regarding these parameters, it is necessary to inform the user in an easy-to-understand manner by display using the OSD as in the menu screen.

  In a conventional liquid crystal projector, the reverse direction is also set on the screen on the OSD, and is often displayed superimposed on the video together with a notification of the current reverse direction. FIG. 10 is an explanatory diagram of an inversion setting screen for setting the inversion direction. An inversion setting screen 2 is superimposed on the lower right portion of the background image 1 and is displayed on the inversion setting screen 2. Are provided with options of none A, up and down B, left and right C, and up and down, left and right D, respectively. Note that FIG. 10 shows a state in which the upper and lower B options are selected, and they are displayed inverted when selected with the cursor.

  When the liquid crystal projector is newly installed or when the installation method is changed, the user selects an optimum one from the options on the inversion setting screen 2.

  FIG. 11 shows an example in which the liquid crystal projector device is projected from the back of the screen after being turned upside down by hanging it from the ceiling.

  FIG. 11A shows the case where the reverse setting screen 2 selects “None A” at the time of default. The reverse setting screen 2 is also reversed and is located on the upper right of the background image 1.

  FIG. 11B shows a state in which up / down / left / right D is selected on the inversion setting screen 2, and since the setting is not yet suitable for the installation conditions, the background image 1 is inverted, and the inversion setting screen 2 is in the lower left of the background image 1. Is located.

  FIG. 11C shows a state in which left and right C are selected on the inversion setting screen 2. In this case as well, the setting is not suitable for the installation conditions, the background image 1 is inverted, and the inversion setting screen 2 is displayed on the background image 1. Located in the upper left.

  FIG. 11D shows a state where the upside and downside B selection options are selected on the inversion setting screen 2, which is a setting suitable for the installation conditions, and the background image 1 is normally projected, and the inversion setting screen. 2 is located in the lower right of the background image 1.

  Conventionally, when the user performs a menu operation for setting the reverse direction, the position of the reverse setting screen 2 does not change the relative position from the background image 1 as shown in FIG. The absolute position on the background image 1 changes.

  Further, when shifting between the options, not only the reversal direction of the background image 1 changes, but also changes to the position of the reversal setting screen 2 that should be noticed, and the display image changes dramatically. appear. Such a change is a source of confusion for the user and leads to a decrease in the feeling of use.

  An object of the present invention is to solve the above-described problems and provide a display device in which the position of the inversion setting screen does not change with respect to the background image.

The technical feature of the display device according to the present invention for achieving the above object is that the overlay circuit is superimposed on the background image and output as a superimposed image, and the overlay image is inverted and inverted. a display device comprising an inverting circuit for outputting an image, and a control circuit unit for controlling the composition circuit portion and the inverting circuit portion, and a display unit for displaying an image obtained by the inversion process, the inverting circuit The inversion direction is one of up / down inversion, left / right inversion, and up / down / left / right inversion, and the control circuit unit sets the inversion direction in the inversion circuit unit and displays the superimposed image. so that the position on the display screen of the overlay image when reversing does not change after inverting the front reversing, the position of superimposing the overlay image on the background image to the inverted direction Flip and is to set.

  According to the display device of the present invention, the user is confused by displaying the menu screen at an absolute position on the background image regardless of any setting during the reverse setting operation at the time of installation. Can be prevented and the usability can be improved.

  Further, if the reverse setting screen is arranged at the center of the background image, the user can be prevented from being confused in the same manner.

  The present invention will be described in detail based on the embodiment shown in FIGS.

  FIG. 1 is a block circuit configuration diagram of a liquid crystal projector according to the first embodiment. The digital RGB signal output of the A / D converter 11 and the YUV signal output of the video decoder 12 are connected to the OSD circuit 14 as a digital RGB signal output via the scan converter 13. The scan converter 13 and the OSD circuit 14 are connected to a frame buffer 15 for image buffering. The digital RGB output from the OSD circuit 14 is output as a light valve drive signal via the D / A converter 16 and the light valve drive circuit 17.

  These A / D converter 11, video decoder 12, scan converter 13, OSD circuit 14, frame buffer 15, D / A converter 16, and drive circuit 17 are connected to a bus 18.

  The bus 18 includes a microcomputer 19, a RAM 20 including a stack and a work area for operating the microcomputer 19, a program and data area for operating the microcomputer 19, and an image displayed as an overlay. ROM 21 which stores in the form of compression or non-compression or a specific program, NVRAM which stores data such as settings related to the operation of the projector and settings on the menu screen, and holds even when the power is not supplied to the projector Memory) 22 is connected.

  Further, a menu switch 23, a selection switch 24, a right switch 25, a left switch 26, a lower switch 27, and an upper switch 28 are connected to the microcomputer 19.

  The menu switch 23 is a switch means for receiving an instruction to shift to a menu setting mode for setting by a user's menu. When the menu switch 23 is pressed, a transition from a menu non-display state to a menu display state is performed. Conversely, a transition from the menu display state to the menu non-display state is performed.

  The selection switch 24 is a switch means for receiving a selection instruction from the user in the menu setting mode. When the selection switch 24 is pressed, setting of a setting value in the menu display state or state transition in the menu screen is performed. Etc. are performed.

  The right switch 25, the left switch 26, the down switch 27, and the up switch 28 are switch means for receiving menu operation instructions such as right movement, left movement, down movement, and up movement of the cursor from the user in the menu setting mode, respectively. is there.

  First, the analog RGB signal input to the A / D converter 11 is subjected to color processing such as brightness and contrast of the input image signal by the A / D converter 11, and is subjected to analog-digital conversion to be converted into a digital RGB signal. Also, the composite color video signal (composite signal) input to the video decoder 12 is subjected to color processing such as brightness and contrast by the video decoder 12 to be converted into a YUV signal and input to the scan converter 13 respectively.

  In the present embodiment, the description is limited to analog RGB signals and composite signals, but in reality, there is no problem even with component signals, other video signals, and IEEE1394 AV signals.

Scan converter 13 to either the input digital RGB signals and YUV signals, menu transition of the liquid crystal projector, and an instruction from the microcomputer 19 which functions as the row have control circuit section controls the setting of the device associated with it And the frequency and resolution are recognized, and then recorded in the frame buffer 15 as an input image. Thereafter, the scan converter 13 reads the input image from the frame buffer 15 asynchronously with the writing, converts it into an image signal with an appropriate resolution, and outputs it to the OSD circuit 14.

The frame buffer 15 records an overlay image in accordance with an instruction from the microcomputer 19 separately from the above-described input image. The recorded overlay image is read by the OSD circuit 14, and the OSD circuit 14 functioning as a synthesis circuit unit performs an overlay process on the image output from the scan converter 13 and the overlay image, and then performs a D / A converter. 16 outputs the image after overwriting as a digital RGB signal. A typical overlay image is a menu screen described later.

The light valve drive circuit 17 can drive the light valve so that the image on the light valve functioning as the display unit is formed as it is, and the image is formed by horizontally flipping or vertically flipping, or by adding left and right and vertically flipping. It is. As the light valve, a transmissive liquid crystal panel, a reflective liquid crystal panel, a mirror device, or the like is actually used. By this light valve, light from a light source (not shown) is transmitted or reflected, and is projected as an image on a screen through a lens device.

  FIG. 2 shows a memory map of the NVRAM 22. The stored data and the NVRAM 22 are controlled by the microcomputer 19. The area R1 is an area for storing the accumulated usage time, and 4 bytes are prepared. At the time of shipment from the factory, 0 is written in this region R1, and 1 is added every minute by the microcomputer 19 during the operation of the liquid crystal projector.

  The area R2 is a 1-byte area in which data indicating the input source is stored, and the input source in this embodiment is the above-described analog RGB signal and composite signal, each having a unique ID and displayed. ID of the input source is stored. Further, when the liquid crystal projector is started up and when the setting on the menu screen described later is changed, the microcomputer 19 changes the setting of the scan converter 13 so as to take a suitable input source according to the value of this region R2. .

  The region R3 is a 1-byte region in which data indicating contrast is stored. In this embodiment, the contrast ranges from -128 to 127, and the value is stored. Further, when the projector is started up and when the setting on the menu screen described later is changed, the A / D converter 11 or the video decoder 12 is executed by the microcomputer 19 according to the value of the area R3 and the value of the input source of the area R2. The contrast setting is changed.

  The area R4 is a 1-byte area in which data indicating brightness is stored. The brightness in this embodiment ranges from -128 to 127, and the value is stored. When the liquid crystal projector is started up and when the setting on the menu screen described later is changed, the microcomputer 19 determines the value of the A / D converter 11 or the video decoder 12 according to the value of the region R4 and the value of the input source of the region R2. The brightness setting is changed.

The area R5 is a 1-byte area in which data indicating the inversion direction is stored. The inversion directions are “none”, “left / right”, “up / down”, and “up / down / left / right”. Stored. A light valve that functions as an inversion circuit unit so that a suitable inversion process is performed by the microcomputer 19 according to the value of the region R5 when the liquid crystal projector is started up and when a setting on a menu screen described later is changed. The setting of the drive circuit 17 is changed. Detailed control of the microcomputer 19 at this time will be described later.

  An area R6 is a 1-byte area in which data indicating the position of the menu screen is stored. In this embodiment, there are four menu positions of “upper left”, “upper right”, “lower left”, and “lower right”. Each ID is assigned and stored. In accordance with the value of this region R6, the microcomputer 19 controls the OSD circuit 14 so that the menu screen is displayed at a suitable position. Note that the type, address, size, and the like of the data stored in the NVRAM 22 and the control method thereof are for explaining one embodiment, and do not limit the present invention.

  In this embodiment, the menu screen is displayed by pressing the menu switch 23 when the menu screen is not displayed. Conversely, when the menu switch 23 is pressed while the menu screen is displayed, the menu screen is not displayed.

  This menu screen has a hierarchical structure, and FIG. 3 shows an example of the highest layer of the menu screen 31, and the background image 32 is an image represented by an analog RGB signal or composite signal input to the scan converter 13. .

  The menu screen 31 is displayed at the lower right of the background image 32, and the menu screen 31 has three options of video setting E, inversion setting F, and menu position G. In FIG. 3, the cursor is positioned at the video setting E, and this cursor moves when the lower switch 27 or the upper switch 28 is pressed. Then, by pressing the selection switch 24, the option at the cursor position is selected, and the screen moves to the corresponding lower layer screen.

  4 shows a lower level video setting screen when the video setting E is selected on the menu screen 31 of FIG. 3. The background image 32 is the same as FIG. Displayed in the lower right. This video setting screen 33 displays three options of input source H, contrast I, and brightness J. In FIG. 4, the cursor is positioned at contrast I. This cursor is moved by the lower switch 27 or the upper switch 28. It can be moved up and down.

  The input source H is for selecting whether to display an analog RGB signal or a composite signal. There are setting values of “RGB” and “VIDEO”, and two setting values are set by the right switch 25 and the left switch 26. Are switched and the selected value is written to the area R2 of the NVRAM 22 and at the same time, the selected setting is made.

  The contrast I is used to set the contrast of the background image 32, and the set value can be changed in the range of -128 to 127 by the right switch 25 and the left switch 26. When the change occurs, the changed value is written to the area R3 of the NVRAM 22 and at the same time, the changed setting is obtained.

  Brightness J is used to set the brightness of the background image 32, and the set value can be changed in the range of -128 to 127 with the right switch 25 and the left switch 26. When the change occurs, the changed value is written to the area R4 of the NVRAM 22 and the changed setting is made at the same time.

FIG. 5 shows a lower level inversion setting screen when the inversion setting F is selected on the menu screen 31 in FIG. 3. The background image 32 is the same as in FIG. 3, and the inversion setting screen 34 is the background image 32. Is displayed at the bottom right of. This inversion setting screen 34 displays options that function as a request reception unit for making settings related to four inversions of none A, up and down B, left and right C, and up and down and left and right D.

  FIG. 5 shows a case where the cursor is positioned up and down B, and the cursor can be moved up and down and left and right by the right switch 25, the left switch 26, the lower switch 27 and the upper switch 28. When the position of the cursor changes, the selected value is written into the area R5 of the NVRAM 22 and at the same time the selected setting is made. In this case, another process is performed, which will be described later. In the microcomputer 19, switch operation information is exchanged during this menu operation.

  FIG. 6 shows a menu position screen in the lower hierarchy when the menu position G is selected on the menu screen 31 in FIG. 3, the background image 32 is the same as in FIG. 3, and the menu position screen 35 is in the lower right of the background image 32. Is displayed. The menu position screen 35 displays four options of upper left K, upper right L, lower left M, and lower right N. FIG. 6 shows the case where the cursor is positioned at the lower right N, and the right switch 25. The left switch 26, the lower switch 27, and the upper switch 28 can move the cursor up, down, left, and right. When the cursor position changes, a value corresponding to the inversion setting area R6 of the NVRAM 22 is written, and at the same time, the selected setting is performed, and the position where the menu screen 31 is displayed is changed to the selected place.

  FIGS. 7A to 7D show an example of the inversion setting in this embodiment. As described above, when the liquid crystal projector is newly installed or when the installation method is changed, the liquid crystal projector is suspended from the ceiling or the like upside down. In the figure, a liquid crystal projector is arranged and projected from the back of the screen. In each of the inversion setting screens 34, there are shown cases where none A, up and down B, left and right C, and up and down left and right D options are selected.

  FIG. 8 shows a flowchart of the inversion setting process. First, in step S1, when the inversion setting F on the menu screen 31 is selected and an inversion setting change request is generated, in step S2, the microcomputer 19 performs the menu even if inversion is performed. Calculate the menu position so that the position does not change. For example, a method of searching a table created in advance may be used, or a method of obtaining by calculation may be considered.

  Next, after the menu position obtained in step S3 is written in the area R6 of the NVRAM 22, data indicating inversion is written in the area R5 of the NVRAM 22 in step S4. Then, in step S5, the menu position is actually set in the OSD circuit 14, and in step S6, this inversion is set in the light valve driving circuit 17. Then, in step S7, the menu is refreshed and the process ends.

  In this embodiment, the menu positions are set at the four corners of the background image 32. However, the present invention is not limited to this. For example, the menu positions may be coordinate values.

  In the second embodiment, the menu screen position is set to the center of the background image 32 at the same time as the transition to the reverse setting screen 34.

  The screens of FIGS. 9A to 9D respectively show the cases where the selection of none A, up / down / left / right D, left / right C, and up / down B is selected on the inversion setting screen 34.

  The difference from the first embodiment is that the OSD circuit 14 sets the menu position at the center of the background image 32 when the reverse setting F is selected on the menu screen 31 in the highest hierarchy, and the flowchart in FIG. The menu position calculation in step S2, the menu position writing in step S3, and the menu position setting in step S5 are omitted.

1 is a block circuit configuration diagram of Embodiment 1. FIG. It is a memory map of NVRAM. It is explanatory drawing of a menu screen. It is explanatory drawing of a video setting screen. It is explanatory drawing of a reverse setting screen. It is explanatory drawing of a menu position screen. It is explanatory drawing of the inversion setting screen of Example 1. FIG. It is a flowchart figure of inversion setting processing. It is explanatory drawing of the inversion setting screen of Example 2. FIG. It is explanatory drawing of the conventional inversion setting screen. It is explanatory drawing of the conventional inversion setting screen.

Explanation of symbols

11 A / D converter 12 Video decoder 13 Scan converter 14 OSD circuit 15 Frame buffer 16 D / A converter 17 Light valve drive circuit 18 Bus 19 Microcomputer 20 RAM
21 ROM
22 NVRAM
23 menu switch 24 selection switch 25 right switch 26 left switch 27 lower switch 28 upper switch 31 menu screen 32 background image 33 video setting screen 34 reverse setting screen 35 menu position screen

Claims (3)

A synthesis circuit unit that overlays an overlay image on a background image and outputs the overlay image;
An inverting circuit unit for inverting the superimposed image and outputting the inverted image;
A control circuit unit for controlling the synthesis circuit unit and the inverting circuit unit;
A display device including a display unit configured to display the inverted image.
The inversion direction in the inversion circuit unit is one of up / down inversion, left / right inversion, and up / down / left / right inversion,
The control circuit unit sets the reversal direction in the reversal circuit unit, and when reversing the superimposed image, the position of the overlay image on the display screen is not changed before and after reversal. A display device, wherein a position where the overlay image is superimposed on a background image is set according to the inversion direction . 2. The display according to claim 1 , further comprising a request receiving unit that receives an instruction to select a reversal direction of the superimposed image, and the request receiving unit notifies the control circuit unit of information related to the selected reversal direction. apparatus. The display device according to claim 1 , wherein the overlay image is a menu screen for allowing a user to select an inversion direction in the inversion circuit unit.