JP3975986B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device such as a head-up display.

2. Description of the Related Art Conventionally, some image display apparatuses have been subjected to a so-called occlusion process in which a low priority symbol is not displayed when display symbols on a screen overlap each other (see, for example, Patent Document 1). . Such an occlusion process is performed by obtaining the intersection of a symbol having a high priority and a symbol having a low priority by calculation of the processor.
JP 2001-052146 A

  However, when the occlusion processing is performed by calculation of the processor, the processing is generally complicated and the calculation time becomes long, so the load on the processor increases. Therefore, other calculation processing may not be performed within the necessary time, and real-time image display may not be performed.

  The present invention focuses on solving such problems, and an object of the present invention is to provide an image display apparatus capable of performing occlusion processing without imposing a load on the processor. is there.

  An image display device according to the present invention, which has been made to solve the above problems, generates a plurality of symbols in accordance with instructions from a processor, outputs a drawing signal related to the drawing point of the symbol to a display device, and synchronizes with it. Generated by a symbol generator that outputs position information of the drawing point and LO as an identification signal when the drawing point belongs to a dominant display symbol with high priority, and HI when it belongs to a recessive display symbol with low priority. This is applied when displaying the displayed symbol on the display and is composed of only a logic circuit, and the display range of the dominant display symbol among the two display symbols to be compared is the two range specifying information. While inputting as a reference value the temporary storage part consisting of the loaded register and the value of the range specifying information loaded into this temporary storage part By sequentially inputting the position information value of each drawing point of the low-grade recessive display symbol as a comparison value, it is compared whether or not the drawing point of the recessive display symbol belongs to the display range of the dominant display symbol. A comparator that outputs HI if it belongs, LO if it does not belong, and an identification signal output by the symbol generation device and an output of the identification signal output from this comparator are all HI. And an occlusion processing device for controlling a drawing signal corresponding to each position information by providing an AND circuit that outputs HI to block the display of the drawing point.

  If this is the case, the occlusion processing, which puts a heavy load on the processor, is performed instead of the occlusion processing device, so that the processing load on the processor when displaying an image can be greatly reduced. At the same time, the processor can be used for other arithmetic processing, and as a result, the processing speed of the processor can be increased. Further, the occlusion process of the present invention determines whether or not a drawing point belongs to the display range specified by the two range specifying information, and compares the drawing point with each other to determine the intersection point. Therefore, the processing contents are remarkably simple and the processing amount is drastically reduced. Therefore, the occlusion processing device can be configured by hardware using a simple logic circuit such as a register or a comparator, and high-speed processing is possible. Therefore, it becomes possible to perform the occlusion processing in real time without depending on the processing capability of the processor.

  According to the present invention, the processing load of the processor can be greatly reduced by performing the occlusion processing in real time using the occlusion processing apparatus which is hardware having a simple configuration.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The head-up display H, which is an image display device according to the present embodiment, is shown by a broken line when the position of the dominant display symbol DS having a high priority and the position of the recessive display symbol RS having a low priority overlap as shown in FIG. A so-called occlusion process is performed in which the display of the recessive display symbol RS corresponding to the portion where the display range OA of the enclosed rectangular dominant display symbol DS and the display of the recessive display symbol RS overlap is cut off. In this embodiment, two points A (XA, YA) and B (XB, YB) are set as two range specifying information for determining the display range OA of the dominant display symbol DS, and the shape of the display range OA of the dominant display symbol DS Is a rectangle with two points A and B diagonal. The positions of the two points A and B are appropriately set based on the display position and shape of the dominant display symbol DS so that the dominant display symbol DS can be included and the rectangle has a substantially minimum area.

  As shown in FIG. 2, the head-up display H according to this embodiment includes a processor P, a symbol generation device S, a display D, and an occlusion processing device 1, and the occlusion processing device 1 includes an occlusion processing circuit 10 and a blocking unit 11. It is comprised by.

  The processor P appropriately sets the positions of the two points A and B related to the display range OA of the dominant display symbol DS as described above, and outputs the data XA, XB, YA and YB to the occlusion processing circuit 10. In the present embodiment, the processor P draws the dominant display symbol DS by outputting the luminance signal ds related to the dominant display symbol DS to the display D.

  The symbol generation device S generates one or a plurality of symbols in accordance with an instruction from the processor P, and outputs the luminance signal Z related to the drawing point of the symbol to the display D via the blocking device 11 as the drawing signal Z according to the present invention. At the same time, coordinate data X and Y, which are position information of the drawing point, and an identification signal i for identifying whether the drawing point belongs to the dominant display symbol DS or the recessive display symbol RS are synchronized with it. This is hardware to be output to the processing circuit 10. The luminance signal Z from the symbol generating device S is output to the blocking means 11 as “LO” when “shining” and as “HI” when “not lighting”. The identification signal i is set to output HI when the symbol to be generated is the recessive display symbol RS, and output LO otherwise. In the present embodiment, the symbol generation device S generates only the recessive display symbol RS. Therefore, the identification signal i always outputs HI.

  The blocking means 11 is constituted by an OR circuit. That is, when HI is input from either the luminance signal Z or the occlusion processing circuit 10 from the symbol generation device S, the logical sum becomes HI, so that the luminance signal Z is “light” (LO). Also blocks the luminance signal Z. Further, only when the occlusion processing circuit 10 outputs LO and the luminance signal Z “lights” (LO), the blocking means 11 outputs LO as its logical sum and outputs the luminance signal Z to the display D.

  Here, the occlusion processing circuit 10 will be described in detail with reference to FIG. 3. In the occlusion processing circuit 10, temporary storage units 12a, 12b, 12c, and 12d located on the input side thereof are respectively connected to the comparators 13a, 13b, 13c, and 13d. In addition, the comparators 13 a, 13 b, 13 c, 13 d and the identification signal i are connected to the AND circuit 14.

  In the temporary storage units 12a, 12b, 12c, and 12d, data XA, XB, and YA that are coordinate data of the two points A and B (FIG. 1) are used as two range specifying information for determining the display range OA of the dominant display symbol DS. , YB are so-called registers loaded respectively. Of course, since the processor P determines the positions of the two points A and B according to the deformation / movement of the dominant display symbol DS, the values of the data XA, XB, YA and YB are updated accordingly.

  The comparators 13a, 13b, 13c, and 13d are set in advance when the data XA, XB, YA, and YB are input as reference values and the coordinate data X and Y that are the position information of the drawing points are input as comparison values. It is calculated whether or not the comparison value corresponds to each of the arithmetic expressions XA <X, X <XB, YA <Y, and Y <YB. If the comparison value corresponds to the arithmetic expression, HI is determined. If not, LO is output as the attribute signal c according to the present invention.

  The AND circuit 14 cuts off the blocking means 11 when the outputs of the attribute signal c and the identification signal i output from the comparators 13a, 13b, 13c, and 13d are all HI, that is, when the logical product of the outputs is HI. HI is output.

  In the head-up display H according to this embodiment, when the symbol generation device S displays the recessive display symbol RS, the identification signal i becomes HI as described above. In addition, when the coordinate data X and Y, which are the drawing points of the recessive display symbol RS, belong to the display range OA of the dominant display symbol DS, the attribute signal c output from the comparators 13a, 13b, 13c, and 13d. Are all HI. Therefore, the logical product of the signals input to the AND circuit 14 becomes HI, and the AND circuit 14 outputs HI. Here, since the interruption device 11 is an OR circuit, when HI is input from the AND circuit 14, the output becomes HI, and the luminance signal Z is interrupted regardless of HI and LO.

  In addition, when the drawing point of the recessive display symbol RS is not included in the display range OA of the dominant display symbol DS, any one of the belonging / notifying signals c output from the comparators 13a, 13b, 13c, and 13d becomes LO. The AND circuit 14 outputs LO as the logical product of them. At the same time, if the luminance signal Z output from the symbol generation device S outputs LO “shines”, the logical sum in the blocking means 11 becomes LO, so the luminance signal Z related to the recessive display symbol RS is output to the display D. And displayed.

  With the configuration described above, the occlusion processing device 1 that is dedicated hardware can perform the occlusion processing that has been a heavy load on the processor P in the past.

  With such a configuration, the processing load on the processor P when displaying an image can be greatly reduced, and the processor P can focus on other arithmetic processing. As a result, the processing of the processor P is accelerated, and the performance of the entire head-up display H can be greatly improved.

  In the occlusion process according to the present embodiment, the drawing points related to the coordinate data X and Y as the position information belong to the display range OA of the dominant display symbol DS specified by the two points A and B as the two range specifying information. Compared with the conventional processing for comparing the drawing points to determine the intersection, the processing contents are much simpler and the processing amount is drastically reduced. Therefore, the occlusion processing device 1 is connected to the AND circuit 14 and the register. (Temporary storage unit) 12a, 12b, 12c, 12d and comparators 13a, 13b, 13c, 13d, and a simple logic circuit such as an OR circuit (blocking means 11) can be configured, and high-speed processing is possible. Therefore, it is sufficiently possible to perform the occlusion process in real time without depending on the processing capability of the processor P.

  The present invention is not limited to the embodiment described in detail above.

  The present invention is not limited to the head-up display H, and can be used as long as it is an image display device. In particular, it can be suitably used if it is a stroke type image display device.

  In the above embodiment, the symbol generation device S can also display the dominant display symbol DS. In that case, the identification signal i for displaying the symbol may be set to LO. By doing so, the logical product of the AND circuit 14 becomes LO, and when the luminance signal Z outputs LO (lights up), the luminance signal Z related to the symbol is output from the blocking means 11 to the display device D.

  Although the identification signal i is output from the symbol generator S in the above embodiment, the identification signal i may be output from the processor P.

  In the above-described embodiment, the display range OA of the dominant display symbol DS is set to a rectangle having two points A and B as diagonal lines as range specifying information. However, other shapes can be set by appropriately changing the circuit configuration of the occlusion processing circuit 10. It may be what you did. For example, as the two range specifying information, the coordinates of one point and the data regarding the distance from the coordinates may be set, and the setting may be a circle or rhombus centered on the coordinates.

  Further, in the above embodiment, the blocking unit 11 blocks the output of the luminance signal Z. However, instead of the blocking unit 11, for example, the luminance signal Z is displayed in a semi-transparent or discolored manner. Even a control circuit that appropriately controls the signal Z belongs to the technical scope of the present invention.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the occlusion processing apparatus 1 that performs the occlusion processing on two symbols has been described. However, according to the present invention, the occlusion processing is performed on three or more symbols for which the dominant / inferiority relationship is set. Is also possible. In that case, a plurality of occlusion processing circuits storing the respective occlusion areas are arranged in parallel to the blocking means, and the identification signal inputted to the occlusion processing circuit is stored in the occlusion areas stored by the respective occlusion processing circuits. If the symbol is inferior to the symbol, the HI may be input.

The figure which showed typically the display screen of the head-up display which concerns on one Embodiment of this invention. The block diagram which shows the head-up display which concerns on the same embodiment. The schematic diagram which shows the occlusion processing circuit which concerns on the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Occlusion processing apparatus 10 ... Occlusion processing circuit 11 ... Blocking means 12a, 12b, 12c, 12d ... Temporary storage part 13a, 13b, 13c, 13d ... Comparator H ... Image display apparatus (head-up display)
D: Display DS ... Dominant display symbol RS ... Inferior display symbol OA ... Display range Z of dominant display symbol ... Drawing signal (luminance signal)

Claims (1)

A plurality of symbols are generated in accordance with instructions from the processor, and a drawing signal related to the drawing point of the symbol is output to the display. In addition, the position information of the drawing point and the superiority of the drawing point having a high priority are synchronized with it. When a display symbol generated by a symbol generation device that outputs LO as an identification signal and belongs to a display symbol that belongs to a low-priority recessive display symbol is displayed on a display unit, and a logic circuit Composed only of,
A temporary storage unit composed of a register in which the display range of the dominant display symbol among the two display symbols to be compared is loaded as two range specifying information;
Drawing the inferior display symbol by inputting the value of the range specifying information loaded in the temporary storage unit as a reference value and sequentially inputting the position information value of each drawing point of the inferior display symbol of low priority as a comparison value A comparator that compares whether or not the point belongs to the display range of the dominant display symbol and outputs HI if the point belongs to the display range, and LO if not belonging to the display range;
An AND circuit that outputs HI so as to cut off the display of the drawing point when all of the attribute signals output from the comparator and the output of the identification signal output by the symbol generator are HI. An image display device comprising an occlusion processing device for controlling a drawing signal corresponding to each position information.

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