JP5309875B2 - Pointer display control device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To match the leading end of a pointer figure with the starting point of an image screen even when the leading end of the pointer figure is not matched with the display initiation coordinates of a pointer image area. <P>SOLUTION: The pointer display control device includes a semiconductor integrated circuit, which is programmed using a hardware description language and also stores point image data. The pointer display control device controls the display position of a pointer on an image screen based on an externally input operation instruction and the point image data. The pointer display control device includes a pointer image reading circuit, which determines whether the pointer image area is included in an image screen selection area or not and which, if it is included, reads the pointer image data for a portion included in the image screen selection area of the pointer image area. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

 The present invention relates to a pointer display control device and a display device.

  Conventionally, a pointing device such as a mouse is used to move a mouse cursor (pointer) displayed on a screen such as a liquid crystal display (LCD) and operate a computer in combination with operation input using operation keys. Has been done. In recent years, when a mouse controller for controlling the display of such a mouse cursor is constructed by hardware, an FPGA (Field Programmable Gate Array) which is one of semiconductor integrated circuits that can be programmed using a hardware description language is used. Often to do.

  FIG. 6 is a block configuration diagram of a mouse controller built inside the FPGA. As shown in FIG. 6, the conventional mouse controller 100 includes a control circuit 110 including a coincidence detection circuit 110a and an address decoder 110b, a mouse memory 120, a counter 130, and a read enable decoder 140.

  The control circuit 110 inputs an X coordinate designation signal Xs and a Y coordinate designation signal Ys indicating the display start coordinates of the mouse cursor on the screen, and an X scan counter Xc and a Y scan counter Yc indicating the currently selected dot coordinates on the screen. And Hereinafter, the X coordinate designation signal Xs and the Y coordinate designation signal Ys, and the X scan counter Xc and the Y scan counter Yc will be described with reference to FIG.

  FIG. 7 shows an XY rectangular coordinate system set on the LCD screen. 7 illustrates an LCD screen having a scan area 1344 (X) × 806 (Y) dots and a display area 1024 (X) × 768 (Y) dots. In such an LCD, one screen is obtained by sequentially selecting (scanning) dots from the screen origin (X, Y) = (0, 0) to (1343, 805) in one frame period (1/60 seconds). Is displayed.

 The X scan counter Xc and the Y scan counter Yc are timing signals used for controlling the timing of the scanning operation of the LCD as described above. At the start of one frame, the values of the X scan counter Xc and the Y scan counter Yc are both 0, and the X scan counter Xc is counted up from 0 to 1343 at a predetermined time interval. Is reset to 0, while the Y scan counter Yc is incremented from 0 to 1.

 When the Y scan counter Yc becomes 1, the X scan counter Xc is again counted up from 0 to 1343. Such a counting operation is repeated until the Y scan counter Yc reaches 805. When Yc = 805, when the X scan counter Xc is counted up to 1343, both the X scan counter Xc and the Y scan counter Yc are 0. To complete one frame.

 The LCD scans dots from the screen origin (0, 0) to (1343, 805) in synchronization with the X scan counter Xc and Y scan counter Yc as described above. That is, for example, when the value of the X scan counter Xc is 1000 and the value of the Y scan counter Yc is 10, the LCD currently selects a dot at coordinates (1000, 10). Therefore, the X scan counter Xc and the Y scan counter Yc indicate the coordinates (selected dot coordinates) of the dot currently selected on the LCD screen. Note that the X scan counter Xc and the Y scan counter Yc are generated by a timing generator (not shown).

 In addition, as shown in FIG. 7, the mouse cursor is a mouse image area in which a pointer image such as an arrow is drawn in a mouse image area of horizontal Xw × vertical Yw defined in advance, and the origin position (upper left corner) of the mouse image area. The edge) corresponds to the display start position of the mouse cursor. That is, the X coordinate designation signal Xs and the Y coordinate designation signal Ys indicate the origin position of the mouse image area as the display start coordinates (Xs, Ys) of the mouse cursor.

Such X coordinate designation signal Xs and Y coordinate designation signal Ys are generated by a CPU (Central Processing Unit) (not shown). Normally, when a mouse is operated, information such as a moving direction and a moving speed is sent to the CPU. Then, the CPU calculates the display start coordinates (Xs, Ys) of the mouse cursor on the LCD screen based on various information acquired from the mouse, and uses the calculation results as the X coordinate designation signal Xs and the Y coordinate designation signal Ys. The data is output to the control circuit 110 of the mouse controller 100.
The above is the detailed description of the X coordinate designation signal Xs and the Y coordinate designation signal Ys, and the X scan counter Xc and the Y scan counter Yc. Hereinafter, the description will be continued by returning to FIG.

 The coincidence detection circuit 110a of the control circuit 110 displays the display start coordinates (Xs, Ys) of the mouse cursor indicated by the X coordinate designation signal Xs and the Y coordinate designation signal Ys, and the LCD screen indicated by the X scan counter Xc and the Y scan counter Yc. Is compared with the currently selected dot coordinates (Xc, Yc), and if they match, a start signal indicating the start of reading mouse image data from the mouse memory 120 is output to the counter 130. The address decoder 110b generates a read address of the mouse memory 120 based on the X scan counter Xc and the Y scan counter Yc.

 The mouse memory 120 is a memory that stores mouse image data, that is, data representing a mouse image in which a pointer graphic such as an arrow is drawn in a mouse image area of horizontal Xw × vertical Yw in advance. Here, as shown in FIG. 6, it is assumed that mouse image data corresponding to Xw × Yw = 32 × 32 dots is stored in the mouse memory 120. The mouse image data is stored in the memory space of the X coordinate address Xa = 0 to 31 and Y coordinate address Ya = 0 to 31 in the mouse memory 120.

 The counter 130 is a counter for determining a period (read period) for reading mouse image data from the mouse memory 120, starts a count operation in synchronization with the start signal, and count values (1 to 32) indicating the read period. Is output to the read enable decoder 140. The read enable decoder 140 changes the read enable signal to a valid state only during the count period of the counter 130 (a period in which the count value is 1 to 32) and outputs the signal to the mouse memory 120.

 Next, the operation of the conventional mouse controller 100 configured as described above will be described. In the following, as shown in FIG. 7, the display start coordinates (Xs, Ys) = (0, 0) of the mouse cursor, that is, the X coordinate designation signal Xs and the Y coordinate designation signal Ys corresponding to the screen origin are sent to the control circuit 110. Assume that it is entered.

 In this case, when the X scan counter Xc and the Y scan counter Yc indicating the selected dot coordinates (Xc, Yc) = (0, 0) are input to the control circuit 110, the start signal is output from the coincidence detection circuit 110a to the counter 130. Is done. As a result, the counter 130 starts a count operation and counts up the count value to 1, and the read enable decoder 140 changes the read enable signal to the valid state.

 On the other hand, the address decoder 110b reads the mouse image data stored at the address (Xa, Ya) = (0, 0) in the mouse memory 120 when the selected dot coordinate (Xc, Yc) = (0, 0). A read address is generated and output to the mouse memory 120. As a result, the mouse image data stored at the address (Xa, Ya) = (0, 0) is read from the mouse memory 120 when the dot at the coordinates (0, 0) on the LCD screen is selected. The read mouse image data is synthesized with background image data by a video synthesis unit (not shown). As a result, the dot (0, 0) on the LCD screen has an address (Xa, Ya) in the mouse memory 120. = Mouse image data stored in (0, 0) is displayed.

 Subsequently, the X scan counter Xc is counted up to the selected dot coordinate (Xc, Yc) = (1, 0), and when the count value of the counter 130 is counted up to 2 (the read enable signal is in the valid state). Maintenance), the address decoder 110 b generates a read address for reading out the mouse image data stored at the address (Xa, Ya) = (1, 0) in the mouse memory 120 and outputs the read address to the mouse memory 120. Thus, the mouse image data stored at the address (Xa, Ya) = (1, 0) in the mouse memory 120 is displayed at the dot of the coordinates (1, 0) on the LCD screen.

 Such a reading operation is repeated until the value of the X scan counter Xc reaches 31, that is, until the selected dot coordinates (Xc, Yc) = (31, 0), whereby the address (0, 0) in the mouse memory 120 is obtained. ) To (31, 0) are sequentially read out and displayed on the LCD screen coordinates (0, 0) to (31, 0) dots.

 The counter 130 resets the count value when the count value reaches 32 (at this time, the X scan counter Xc = 31). At this time, the read enable signal is invalidated by the read enable decoder 140. That is, the reading of mouse image data to be displayed at the dots (0, 0) to (31, 0) on the LCD screen has been completed, but the value of the X scan counter Xc is counted up to 1343. The read address corresponding to is output from the address data 110b to the mouse memory 120, but since the read enable signal has transitioned to the invalid state as described above, the value of the X scan counter Xc is 32 to 1343. The mouse image data is not read during the period.

 When the Y scan counter Yc counts up to 1 (when the selected dot coordinate (Xc, Yc) = (0, 1)), the counter 130 restarts the count operation, counts up the count value to 1, and reads. The enable signal transitions to the valid state again. On the other hand, the address decoder 110b reads mouse image data stored at the address (Xa, Ya) = (0, 1) in the mouse memory 120 when the selected dot coordinate (Xc, Yc) = (0, 1). Generate a read address for As a result, the mouse image data stored at the address (Xa, Ya) = (0, 1) in the mouse memory 120 is displayed at the dot of the coordinates (0, 1) on the LCD screen.

 Such a reading operation is repeated until the value of the X scan counter Xc reaches 31, that is, until the selected dot coordinates (Xc, Yc) = (31, 1), whereby the address (0, 1 in the mouse memory 120). ) To (31, 1) are sequentially read out and displayed on the coordinates (0, 1) to (31, 1) on the LCD screen.

The readout operation in the X address direction as described above is repeated until the Y scan counter Yc = 31, whereby the 32 × 32 dot mouse image data stored in the mouse memory 120 is read out. As shown in FIG. 7, the display start position of the mouse cursor is displayed so as to coincide with the origin position of the LCD screen.
JP-A-10-307155 JP 2000-314750 A

In the conventional mouse controller 100 described above, the following problems are pointed out.
(1) The conventional mouse controller 100 compares the X coordinate designation signal Xs and the Y coordinate designation signal Ys with the X scan counter Xc and the Y scan counter Yc, and performs the counting operation when only the first one coincides. Since the mouse image data is read only during the counting period, circuits such as the counter 130 and the read enable decoder 140 are required, and the read address of the mouse memory 120 can only be incremented in order.

(2) Conventionally, since the values of the X scan counter Xc and the Y scan counter Yc are not negative, the display start coordinates (Xs, Ys) of the mouse cursor must always be set to positive values. (If the display start coordinates (Xs, Ys) are set to a negative value, the coincidence detection circuit 110a cannot perform coincidence detection).

 Therefore, as shown in FIG. 7, if the tip of the mouse cursor (arrow) coincides with the display start coordinates (Xs, Ys) of the mouse image area, the display start coordinates (Xs, Ys) = (0, 0). By doing so, the tip of the mouse cursor can be moved to the origin position of the LCD screen without any problem. However, as shown in FIG. 8A, the tip of the mouse cursor is positioned at the display start coordinates (Xs, If it does not match Ys), the value of the display start coordinates (Xs, Ys) cannot be set negative, and the tip of the mouse cursor cannot be moved to the origin position of the LCD screen. In this case, in order to move the tip of the mouse cursor to the origin position of the LCD screen, it is necessary to change the arrangement of the mouse cursor in the mouse image area as shown in FIG. Becomes very complex.

  The present invention has been made in view of the above-described circumstances. Circuits such as conventional counters and read enable decoders can be omitted, and the tip of the pointer graphic does not coincide with the display start coordinates of the pointer image area. Even if it is a case, it aims at providing the pointer display control apparatus and display apparatus which can make the front-end | tip of a pointer figure correspond with a screen origin.

In order to solve the above-described problems, the present invention includes a semiconductor integrated circuit that is programmed using a hardware description language and stores pointer image data as a first solving means related to the pointer display control device. A pointer display control device for controlling a display position of a pointer on a screen based on an input operation instruction and the pointer image data, wherein the current selection dot coordinates in a screen selection area and positive / negative according to the operation instruction Based on the signed pointer display start coordinates, it is determined whether or not a pointer image area is included in the screen selection area. If included, coordinates obtained by subtracting the pointer display start coordinates from the selected dot coordinates Is converted to the read address of the pointer image memory, and the read address is used to Characterized by including a pointer image reading circuit for reading the pointer image data portion included in the screen selection area of the pointer image area.

As a second solution means according to the pointer display control unit, the in the first aspect of the present invention, the pointer image reading circuit, based on the selected dot coordinates and the pointer display start coordinates, the pointer image area the If it is determined and a determination circuit whether contained in the screen selection area, and the pointer image region by said determining circuit is included in the screen selection area, address generation for generating said read address characterized in that it is composed of a circuit.

Further, as a third solving means relating to the pointer display control device, in the second solving means, an XY orthogonal coordinate system is set in the screen selection area, and the determination circuit is configured to display the pointer display start coordinates (Xs , Ys), the selected dot coordinates (Xc, Yc), the width Xw in the X-axis direction of the pointer image area, and the following determination conditional expressions (1) and (2) consisting of the width Yw in the Y-axis direction. , and judging with the pointer image area is included in the screen selection area.

Further, as a fourth solving means related to the pointer display control device, in the third solving means, the address generation circuit calculates the following calculation when both of the determination conditional expressions (1) and (2) are satisfied. equation (3), after calculating the X-coordinate addresses Xa and Y coordinate address Ya of the pointer image memory based on (4), to calculate the linear address La based on the following linear address arithmetic expression (5), the linear and outputs the pointer image memory address La as the read address.

  Furthermore, in the present invention, as a solving means related to the display device, a display unit that displays a screen, a timing generation unit that generates a timing signal indicating a selected dot coordinate in a screen selection region of the display unit, and a timing generation unit A synchronization signal generation unit that generates a synchronization signal necessary for screen display in the display unit, a pointer operation unit for moving the pointer displayed on the screen, and the pointer operation A pointer coordinate generation unit that generates positive and negative signed pointer display start coordinates according to the operation of the unit, a pointer display control device having any one of the first to fourth solving means, and a pointer of the pointer display control device An image composition unit that combines the pointer image data read from the image memory with other image data, and a combination obtained from the image composition unit. Based on the image data, characterized by comprising an image data generating unit that generates image data that can be displayed in the display unit.

In the present invention, the pointer display control device is constructed by a semiconductor integrated circuit that can be programmed using a hardware description language that can handle positive and negative signs, and digital arithmetic processing that can handle both positive and negative numerical values is made possible. Accordingly, the pointer display start coordinates with positive and negative signs are taken in, and the pointer image data of the portion included in the image selection area in the pointer image area is read from the pointer image memory, so that the tip of the pointer graphic is the pointer image. Even in the case where the display start coordinates of the area do not match, the tip of the pointer graphic can be made to match the screen origin.
Furthermore, as a hardware configuration, compared to the conventional mouse controller 100, circuits such as a counter and a read enable decoder can be omitted, and the resources and the design period can be greatly reduced.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a pointer display control device and a display device according to the present invention will be described with reference to the drawings.
[Pointer display control device]
FIG. 1 is a block diagram of the pointer display control apparatus according to the present embodiment. In the following, a mouse controller 1 that performs display control of a mouse cursor (pointer) on an LCD screen according to an operation of a mouse (pointer operation unit) will be described as an example of the pointer display control device according to the present embodiment. . As the LCD screen, an LCD screen having a scan area 1344 (X) × 806 (Y) dots and a display area 1024 (X) × 768 (Y) dots is assumed as in FIG.

  As shown in FIG. 1, the mouse controller 1 in the present embodiment includes a mouse memory 2 and a mouse image reading circuit 3. Such a mouse controller 1 is constructed in a semiconductor integrated circuit (for example, FPGA) programmed using a hardware description language (for example, Verilog HDL) capable of handling positive and negative signs. That is, in the digital arithmetic processing in the mouse controller 1, both positive and negative numerical values can be handled.

As shown in FIG. 1, the mouse memory 2 (pointer image memory) stores mouse image data, that is, data representing a mouse image in which a pointer graphic such as an arrow is drawn in a mouse image area of horizontal Xw × vertical Yw in advance. Is memory. Here, as shown in FIG. 1, mouse image data corresponding to Xw × Yw = 32 × 32 dots is stored in the mouse memory 2. The mouse image data is stored in the memory space of the X coordinate address Xa = 0 to 31 and Y coordinate address Ya = 0 to 31 in the mouse memory 2.
In this embodiment, it is assumed that mouse image data is stored such that the tip of the mouse cursor does not coincide with the display start coordinates (Xs, Ys) of the mouse image area, and the data corresponding to the tip of the mouse cursor is Assume that the address (Xa, Ya) = (20, 20) is stored.

 The mouse image reading circuit 3 (pointer image reading circuit) includes an X scan counter Xc and a Y scan counter Yc that indicate the currently selected dot coordinates (Xc, Yc) on the LCD screen, and a display start coordinate ( X coordinate designation signal Xs and Y coordinate designation signal Ys (with positive and negative signs) indicating Xs, Ys) are input, and these selected dot coordinates (Xc, Yc) and positive and negative signed display start coordinates (Xs, Ys) are input. Based on this, it is determined whether or not the mouse image area is included in the scan area (screen selection area) of the LCD screen. If it is determined that the mouse image area is included, the mouse image area is included in the scan area of the mouse image area. The mouse image data of the existing portion is read from the mouse memory 2.

 As in the prior art, the X scan counter Xc and the Y scan counter Yc are generated by a timing generator (not shown), and the X coordinate designation signal Xs and the Y coordinate designation signal Ys are obtained by a CPU (Central Processing Unit) (not shown). Generated.

 The mouse image reading circuit 3 includes a hit determination circuit 3a and an address generation circuit 3b. The hit determination circuit 3a includes the following determination conditional expression including the display start coordinates (Xs, Ys) of the mouse cursor, the selected dot coordinates (Xc, Yc), the width Xw in the X-axis direction and the width Yw in the Y-axis direction of the mouse image area. When both (1) and (2) are established, it is determined that the mouse image area is included in the scan area of the LCD screen (mouse hit determination), the read enable signal is enabled, and the mouse memory 2 Output to.

 The address generation circuit 3b calculates the address (Xa, Ya) of the mouse memory 2 based on the following arithmetic expressions (3) and (4) when both of the determination condition expressions (1) and (2) are satisfied. After that, a linear address La is calculated based on the following linear address calculation formula (5) (effective address calculation), and the linear address La is output to the mouse memory 2 as a read address.

 Next, the operation of the mouse controller 1 according to this embodiment configured as described above will be described. FIG. 2 is an operation flowchart of the mouse controller 1. As shown in FIG. 2, the mouse image reading circuit 3 of the mouse controller 1 includes an X scan counter Xc and a Y scan counter Yc indicating the currently selected dot coordinates (Xc, Yc) on the LCD screen, and a mouse operation. In response, an X coordinate designation signal Xs and a Y coordinate designation signal Ys (with positive and negative signs) indicating the display start coordinates (Xs, Ys) of the mouse cursor on the LCD screen are input (step S1).

 Here, as shown in FIG. 3, the X coordinate designation signal Xs and the Y coordinate designation signal Ys indicating the display start coordinates (Xs, Ys) = (− 20, −20) of the mouse cursor are input to the mouse image reading circuit 3. Assuming that

 Subsequently, the hit determination circuit 3a in the mouse image reading circuit 3 determines whether or not the mouse image area is included in the scan area of the LCD screen, that is, both the determination conditional expressions (1) and (2) are satisfied. It is determined whether or not (step S2). Specifically, when the currently selected dot coordinates (Xc, Yc) = (0, 0) on the LCD screen, both of the determination conditional expressions (1) and (2) are satisfied (“TRUE”). Then, the process proceeds to the next step S3. At this time, the hit determination circuit 3a makes the read enable signal valid and outputs it to the mouse memory 2.

 As described above, when the currently selected dot coordinate (Xc, Yc) = (0, 0) on the LCD screen and both the conditional expressions (1) and (2) are satisfied, the address generation circuit 3b Calculates the address (Xa, Ya) of the mouse memory 2 based on the arithmetic expressions (3) and (4), and then calculates the linear address La based on the following linear address arithmetic expression (5) (step S3). ).

 That is, the address (Xa, Ya) = (20, 20) of the mouse memory 2 is obtained by the arithmetic expressions (3) and (4), and the linear address La = 20 + (20 << SB) is obtained by the linear address arithmetic expression (5). ) Here, for convenience of explanation, the address is expressed in decimal. However, in actuality, it is a binary number. For example, assuming an 8-bit mouse memory 2, 4 bits are assigned to each of the addresses Xa and Ya. Therefore, the number of shift bits SB is 5 bits.

 The linear address La generated as described above is output to the mouse memory 2 as a read address, whereby the mouse image data stored in the read address is read from the mouse memory 2 (step S4). In other words, when the dot of the coordinates (0, 0) on the LCD screen is selected, the mouse image data (at the tip of the mouse cursor) stored in the address (Xa, Ya) = (20, 20) from the mouse memory 2 is selected. Data) is read out. The read mouse image data is combined with background image data by a video combining unit (not shown). As a result, the dot (0, 0) on the LCD screen has an address (Xa, The mouse image data stored in Ya) = (20, 20) is displayed.

 Subsequently, returning to step S1, when the X scan counter Xc is counted up and the selected dot coordinates (Xc, Yc) = (1, 0), the hit determination result by the hit determination circuit 3a in step S2 is “TRUE”. Therefore, the process proceeds to step S3. In step S3, the address (Xa, Ya) = (21, 20) of the mouse memory 2 and the linear address La = 21 + (20 << 5) are obtained by the effective address calculation by the address generation circuit 3b. Thereby, when the dot of the coordinates (1, 0) on the LCD screen is selected, the mouse image data stored at the address (Xa, Ya) = (21, 20) is read from the mouse memory 2. Mouse image data stored at the address (Xa, Ya) = (21, 20) of the mouse memory 2 is displayed at the dot of the coordinates (1, 0) on the LCD screen.

 Such a series of operations in steps S1 to S4 is repeated until the value of the X scan counter Xc reaches 12, that is, until the selected dot coordinates (Xc, Yc) = (12, 0). Mouse image data from (20, 20) to (31, 20) are sequentially read and displayed on the dots (0, 0) to (12, 0) on the LCD screen.

 When the value of the X scan counter Xc becomes 13, that is, when the selected dot coordinates (Xc, Yc) = (13, 0), the determination conditional expression (1) does not hold, so in step S2 The hit determination result is “FALES”, and the process returns to step S1 without performing steps S3 and S4. At this time, the hit determination circuit 3a disables the read enable signal and outputs it to the mouse memory 2.

 Thus, the period in which the hit determination result in step S2 is “FALES” continues until the value of the X scan counter Xc reaches 13 to 1343. That is, the mouse image data is not read from the mouse memory 2 during the period from when the selected dot coordinates (Xc, Yc) reach (13, 0) to (1343, 0).

 When the X scan counter Xc is reset and the Y scan counter Yc is incremented to 1 (when the selected dot coordinates (Xc, Yc) = (0, 1)), the conditional expression (1) and (2) Therefore, the hit determination result in step S2 becomes “TRUE” again. Similarly to the above, the series of operations in steps S1 to S4 continues until the value of the X scan counter Xc reaches 12, that is, the selected dot coordinate. The process is repeated until (Xc, Yc) = (12, 1), mouse image data from addresses (20, 21) to (31, 21) in the mouse memory 2 are sequentially read out, and the coordinates (0 1) to (12, 1).

 When the value of the X scan counter Xc becomes 13, that is, when the selected dot coordinates (Xc, Yc) = (13, 1), the determination conditional expression (1) does not hold again, so step S2 The hit determination result at is again “FALES”, and the mouse image data is not read from the mouse memory 2 during the period until the selected dot coordinate (Xc, Yc) reaches (13, 1) to (1343, 1). I will not.

 By repeating the above operation until the value of the Y scan counter Yc reaches 12, the portion of the 32 × 32 dot mouse image data stored in the mouse memory 2 is included in the scan area, That is, mouse image data from addresses (20, 20) to (31, 31) is read and displayed in a rectangular area from coordinates (0, 0) to (12, 12) on the LCD screen. That is, as shown in FIG. 3, even if the tip of the mouse cursor does not coincide with the display start coordinates (Xs, Ys) of the mouse image area, the tip of the mouse cursor can be moved to the origin position of the LCD screen. .

 On the other hand, when the value of the Y scan counter Yc becomes 13, that is, when the selected dot coordinates (Xc, Yc) = (0, 13), the determination conditional expression (2) does not hold, so in step S2 The hit determination result is “FALES” again, and the mouse image data is read from the mouse memory 2 in the period until the selected dot coordinate (Xc, Yc) reaches (134, 805) from (0, 13). Absent.

 As described above, in the present embodiment, the mouse controller 1 is constructed by an FPGA that can be programmed using a hardware description language that can handle positive and negative signs, and can perform digital arithmetic processing that can handle both positive and negative numerical values. Therefore, by incorporating the display start coordinates (Xs, Ys) of the mouse cursor with a positive / negative sign and performing a hit determination according to the determination conditional expressions (1) and (2), the tip of the mouse cursor displays the mouse image area. Even if it does not coincide with the start coordinates (Xs, Ys), the tip of the mouse cursor can be moved to the origin position of the LCD screen.

Further, even when the display start coordinates (Xs, Ys) of the mouse cursor are set to be negative by performing a linear dress operation in which positive and negative signs are taken into the address (Xa, Ya) of the mouse memory 2, the conventional (FIG. 8) As shown in (b), it is possible to display easily from the middle of the mouse image (part included in the scan area) without performing the mouse image conversion process.
Furthermore, as a hardware configuration, compared to the conventional mouse controller 100 (see FIG. 6), circuits such as the counter 130 and the read enable decoder 140 can be omitted, and the resources and design period can be greatly reduced. It becomes possible.

 In the above embodiment, the arrow is exemplified as the mouse cursor. However, even in the case of a special figure such as an hourglass or a line-like figure, by moving the display start coordinates (Xs, Ys) to the negative region, A display as shown in FIG. 4A is possible. In the above embodiment, the mouse has been described as the pointer operation unit. However, for example, as shown in FIG. 4B, by rotating a rotary knob or the like as the pointer operation unit, The present invention can be applied even when the marker is moved.

[Display device]
Next, the display device according to this embodiment will be described. Hereinafter, as a display device according to the present embodiment, a waveform measurement device that displays a measured waveform on a display unit, such as a digital oscilloscope, will be described as an example.

 FIG. 5 is a schematic configuration diagram of the waveform measuring apparatus 10 according to the present embodiment. As shown in FIG. 5, the waveform measuring apparatus 10 includes a mouse 20, a mother board 30, and an LCD 40. The mouse 20 (pointer operation unit) is a pointing device for moving a mouse cursor displayed on the screen of the LCD 40, and operation information such as a moving direction and a moving amount is mounted on the motherboard 30 according to the operation. To a USB (Universal Serial Bus) -I / F 31.

 On the motherboard 30, a USB-I / F 31, a CPU 32, a PCI (Peripheral Component Interconnect) bus 33, a waveform memory 34, and a graphic controller FPGA 35 are mounted.

 The USB-I / F 31 is an interface for transmitting and receiving signals between the mouse 20 and the CPU 32, and outputs operation information such as a moving direction and a moving amount input from the mouse 20 to the CPU 32. The CPU 32 (pointer coordinate generation unit) calculates the positive and negative signed display start coordinates (Xs, Ys) of the mouse cursor on the screen of the LCD 40 based on the operation information acquired from the mouse 20 via the USB-I / F 31. The calculation results are output to the graphic controller FPGA 35 via the PCI bus 33 as the X coordinate designation signal Xs and the Y coordinate designation signal Ys. The waveform memory 34 is a memory for storing a waveform measured by a measurement unit (not shown) and other general-purpose waveforms.

 The graphic controller FPGA 35 is an FPGA programmed using a hardware description language capable of handling positive and negative signs, and includes a mouse controller 1, a marker controller 1A, a cursor controller 1B, and a PCI-I / F 35a. A timing generator 35b, a waveform controller 35c, a waveform memory I / F 35d, a video synthesis unit 35e, and LVDS (Low Voltage Differential Signaling) drivers 35f and 35g are constructed by logic circuits.

 As described above, the mouse controller 1 (pointer display control device) controls the display of the mouse cursor on the screen of the LCD 40 in accordance with the operation of the mouse 20, and the mouse memory 2 and the mouse image reading circuit 3 It comprises a determination circuit 3a and an address generation circuit 3b). Since the mouse controller 1 has already been described, detailed description thereof will be omitted.

 The marker controller 1A (pointer display control device) controls the display of the line-shaped marker on the screen of the LCD 40 in response to an operation of a marker operation unit (not shown) (for example, a rotary knob). Similar to the mouse controller 1 (having a marker memory for storing marker image data instead of the mouse memory 2). The cursor controller 1B (pointer display control device) controls the display of a cursor of a predetermined figure on the screen of the LCD 40 according to the operation of a cursor operation unit (not shown), and the internal configuration is the same as that of the mouse controller 1. Yes (has a cursor memory for storing cursor image data instead of the mouse memory 2).

 The PCI-I / F 35 a is an interface for transmitting and receiving signals between the PCI bus 33 and the graphic controller FPGA 35, and an X coordinate designation signal Xs and a Y coordinate designation signal Ys sent from the CPU 32 via the PCI bus 33. Is output to the mouse controller 1, mouse image data to be stored in the mouse memory 2 is output to the mouse memory 2, and waveform data to be stored in the waveform memory 34 is output to the waveform memory I / F 35 d.

 The timing generator 35b (timing generator) generates an X scan counter Xc and a Y scan counter Yc indicating the currently selected dot coordinates (Xc, Yc) on the screen of the LCD 40 as timing signals, and these X scan counter Xc and Y scan The counter Yc is output to the mouse controller 1, marker controller 1A, cursor controller 1B, waveform controller 35c, and LVDS driver 35f.

 The waveform controller 35c reads waveform data from the waveform memory 34 via the waveform memory I / F 35d in synchronization with the X scan counter Xc and the Y scan counter Yc, and outputs the read waveform data to the video synthesis unit 35e. The waveform memory I / F 35d is an interface that transmits and receives signals between the waveform memory 34 and the waveform controller 35c, and between the waveform memory 34 and the PCI-I / F 35a.

 The video composition unit 35e (image composition unit) is output from the mouse image data output from the mouse controller 1, the marker image data output from the marker controller 1A, the cursor image data output from the cursor controller 1B, and the waveform controller 35c. Waveform data to be synthesized, and the synthesized image data is output to the LVDS driver 35g.

 The LVDS driver 35f (synchronization signal generation unit) generates a synchronization signal necessary for screen display on the LCD 40 based on the X scan counter Xc and the Y scan counter Yc generated by the timing generator 35b and outputs the synchronization signal to the LCD 40. The LVDS driver 35g (image data generation unit) generates image data that can be displayed on the LCD 40 based on the combined image data obtained from the video combining unit 35e and outputs the generated image data to the LCD 40.

 The LCD 40 (display unit) is a liquid crystal display having a screen of, for example, a scan area 1344 (X) × 806 (Y) dot and a display area 1024 (X) × 768 (Y) dot, and is generated by the LVDS driver 35f. Based on the synchronization signal and the image data generated by the LVDS driver 35g, an image such as a mouse cursor, a marker, a cursor, and a waveform is displayed on the screen.

According to the waveform measuring apparatus 10 configured as described above, even if the mouse cursor, the marker, and the tip of the cursor do not coincide with the display start coordinates of the respective image areas, the respective tips are set to the origin positions of the screen of the LCD 40. It is possible to move to.
In the above embodiment, the waveform measuring device 10 is exemplified as the display device. However, if the display device displays a pointer on the screen according to the operation of the pointer operation unit, such as a personal computer, the present invention is not limited thereto. The invention can be applied.

It is a block block diagram of the pointer display control apparatus (mouse controller 1) which concerns on one Embodiment of this invention. It is an operation | movement flowchart of the mouse controller 1 which concerns on one Embodiment of this invention. It is auxiliary explanatory drawing regarding operation of mouse controller 1 concerning one embodiment of the present invention. It is an example of a screen display at the time of using the mouse controller 1 which concerns on one Embodiment of this invention. 1 is a schematic configuration diagram of a display device (waveform measuring device 10) according to an embodiment of the present invention. It is a block block diagram of the conventional mouse controller. It is auxiliary explanatory drawing regarding the conventional mouse controller. It is explanatory drawing which shows the problem of the mouse controller 100 in the past.

Explanation of symbols

 DESCRIPTION OF SYMBOLS 1 ... Mouse controller (pointer display control apparatus), 2 ... Mouse memory, 3 ... Mouse image reading circuit, 3a ... Hit determination circuit, 3b ... Address generation circuit, 10 ... Waveform measurement apparatus (display apparatus), 20 ... Mouse, 30 ... Motherboard, 40 ... LCD, 31 ... USB-I / F, 32 ... CPU, 33 ... PCI bus, 34 ... Waveform memory, 35 ... Graphic controller FPGA, 1A ... Marker controller, 1B ... Cursor controller, 35a ... PCI-I / F, 35b ... Timing generator, 35c ... Waveform controller, 35d ... Waveform memory I / F, 35e ... Video synthesis unit, 35f, 35g ... LVDS driver

Claims (5)

A pointer that is programmed using a hardware description language and stores a pointer image data and that controls the display position of the pointer on the screen based on an externally input operation instruction and the pointer image data A display control device,
If it is determined whether or not the pointer image area is included in the screen selection area based on the currently selected dot coordinates in the screen selection area and the positive and negative signed pointer display start coordinates according to the operation instruction Performs a calculation for converting a coordinate obtained by subtracting the pointer display start coordinate from the selected dot coordinate into a read address of the pointer image memory, and is included in the screen selection region of the pointer image region using the read address. A pointer display control device comprising a pointer image reading circuit for reading the pointer image data of a portion to be read. The pointer image reading circuit includes:
Based on the selected dot coordinates and the pointer display start coordinates, a determination circuit whether the pointer image area is included in the screen selection area,
If it is determined that the pointer image area is included in the screen selection area by the determination circuit, and an address generation circuit for generating the read address
To be composed of pointer display control device according to claim 1, wherein. An XY orthogonal coordinate system is set in the screen selection area,
The determination circuit includes the following determination condition expression (1) including the pointer display start coordinates (Xs, Ys), the selected dot coordinates (Xc, Yc), the width Xw in the X-axis direction and the width Yw in the Y-axis direction of the pointer image area. 3. The pointer display control device according to claim 2, wherein when both of (2) and (2) are established, it is determined that the pointer image area is included in the screen selection area.

Said address generating circuit, the determination condition expression (1), if both of (2) is satisfied, the following arithmetic expression (3), X coordinate address Xa and the Y-coordinate of the pointer image memory based on (4) after calculating the addresses Ya, calculates the linear address La based on the following linear address arithmetic expression (5), according to claim 3, characterized in that outputs the linear address La in the pointer image memory as the read address Pointer display control device.

A display for displaying a screen;
A timing generation unit that generates a timing signal indicating a selected dot coordinate in the screen selection region of the display unit;
Based on the timing signal generated by the timing generation unit, a synchronization signal generation unit that generates a synchronization signal necessary for screen display in the display unit,
A pointer operation unit for moving and operating the pointer displayed on the screen;
A pointer coordinate generation unit that generates a pointer display start coordinate with a positive or negative sign according to an operation of the pointer operation unit;
The pointer display control device according to any one of claims 1 to 4,
An image combining unit that combines the pointer image data read from the pointer image memory of the pointer display control device with other image data;
An image data generation unit that generates image data that can be displayed on the display unit, based on the combined image data obtained from the image combining unit;
A display device comprising:

Images