JP2677677B2 - Display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a display device suitable for operation of a computer or various electronic devices, and in which the user operates another job while observing the display. The present invention relates to a display device suitable for:

<Prior Art> Conventionally, as this type of display device, for example, there is one as shown in FIG. 4 and FIG. FIG. 4 is a cross-sectional view of the configuration of the display 40 of this display device, and FIG. 7 is a diagram showing a state in which this display device is worn by an operator.

In FIG. 4, reference numeral 41 is an LED array as a light source arranged at the bottom of the housing 42. The LED array 41 is, for example, a one-dimensional high-density monolithic array of about 32 dots / mm, and although only one element is shown in this figure, a plurality of elements are arranged in a direction perpendicular to the plane of the drawing. The LEDs are arranged in series, and if the length of the LED array is about 8.4 mm, the total number of LED elements is 280 dots.
Further, 43 is a vibrating mirror arranged to face the light source in order to obtain a two-dimensional image of the light source, and 44 is a resonant scanner that vibrates the vibrating mirror 43 at high speed. Vibrating mirror above
When the LED array 41 blinks in response to a data signal in synchronization with the vibration of 43, a plane image is displayed on the vibrating mirror 43 as a virtual image. Then, a signal for one screen is sent during one cycle of the vibration mirror 43, and a display for one screen is performed. Further, 45 is a lens, and the LED above is attached to the focus of this lens 45.
The array 41 is arranged so that the light from the LED array 41 reflected by the vibrating mirror 43 becomes parallel light by the lens 45 and reaches the eyes 46 of the operator. In this case, the lens 45 may be installed between the LED array 41 and the vibrating mirror 43.

As shown in FIG. 7, the display 40 is attached to one end of a frame 70, and the other end of the frame 70 is attached to a headphone 72 via a rotation supporting member 71. Then, the display device 40 is rotationally moved in the lateral direction with the position of the rotation support member 71 as a fulcrum, and is switched between the observation position and the non-observation position. Further, the lead wire 73 is held on the clothes by a clip 74 so as not to interfere with the work, and is connected to a host unit (not shown) placed at another place. The operator can see the image displayed by the display 40 by putting the headphone 72 on the head and positioning the display 40 in front of the eyes.

In the above LED array, the LED elements are linearly arranged in a line for the sake of simplicity. That is,
Although it has been described as the arrangement shown in FIG. 2 (a), in actuality, they are arranged in a staggered manner as shown in FIG. 2 (b) in order to increase the pixel density. The density of the LED elements on the line is the same for both (a) and (b), but (b) is apparently twice as dense as (a). When displaying an image with the LED array having the arrangement of (b) above, odd-numbered columns 5 ₁ , ..., 5
_{Since n} and the even-numbered columns 4 ₁ , ..., 4 _n are separated by d,
The lighting time of either the odd-numbered column or the even-numbered column is set to the d
The same column is displayed in the odd-numbered column and the even-numbered column with a delay of a time corresponding to. Then, the odd-numbered columns and the even-numbered columns are alternately turned on to sequentially turn on the vibrating mirror 43 in one cycle.
The frame image is displayed.

FIG. 8 is a block diagram showing an example of an LED driver for driving such an LED array.

The LED array 80 comprises a set of 100 dot LEDs, ie, 1D, 2
This is an LED array in which D, ..., 100D and another set of LEDs, that is, 1E, 2E, ..., 100E are arranged in a zigzag pattern to form 200 dots, and the gap between the two rows is separated by three columns. This LED array 80 includes drivers 81,8 including shift registers and latches.
It is connected to 2 by wire bonding. Dd, De
Is the image signal, and the arrow X is the scanning direction due to the vibration of the mirror.

An image for one column by the image signals Dd, De is displayed as an array of 200 dots, that is, 1D, 1E, 2D, 2E, ..., 99D, 99E, 100
To display on D, 100E on one straight line, 1D, 2D,…, 99D, 100D
Lighting needs to be delayed by a time equivalent to three columns. In this way, although there is a lighting time difference between the two rows of LEDs, the lighting image is 1D, 1E, 2 due to the afterimage effect of the eyes.
D, 2E,… 99D, 99E, 100D, 100E appear to be in line. SR ₁ , SR ₂ , SR ₃ , and SR ₄ are 100-bit shift registers for creating a time difference of three columns. Of these, SR ₂ and SR ₃ are not for making a time difference, but for changing the arrangement order to correct the arrangement being reversed because the drivers 81 and 82 use the same element. This can be omitted if the shift register SR ₀ of the drivers 81 and 82 is a phase shift register (with an up / down function).

<Problems to be Solved by the Invention> As described above, in the above-described conventional display device, a register is required to delay the lighting time of either the even column or the odd column of the LED array, and the delay time is several times. Since the number of LED elements in the column is large, the number of registers is large,
In addition to the increase in the number of gates for configuring the register, there is a drawback that the cost is increased and the control circuit is complicated.

Further, as shown in FIG. 5, the display of this display device has a display window so that the user can see the background with one eye and the background (for example, a computer keyboard) with the other eye. The structure is such that 48 is placed on either the left or right side of the device. FIG. 5 shows a case where the background is viewed with the right eye while the screen is viewed with the left eye. When the user looks at the screen with his right eye and looks at the background with his left eye using this display, the display may be turned upside down as shown in FIG. However, if the display is turned upside down, the screen will look upside down as it is, so it is necessary to flip the screen upside down.Therefore, for the right eye and the left eye, the lighting order of the odd and even columns of the LED array is changed. It is necessary to reverse, and therefore, a register for delaying the lighting time is required for both the odd-numbered column and the even-numbered column, which further increases the cost and complicates the control circuit.

Therefore, an object of the present invention is to provide a display device that does not require a register for delaying the lighting time as described above, is inexpensive, and has a simple control circuit.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has a plurality of LED elements arranged in a straight line, the LED element rows are arranged in parallel, and the LED elements of each LED element row are arranged. LED of other LED element row
It has an LED array that is arranged so that it does not overlap the element and the direction perpendicular to the array direction.
In a display device that lights up for each element row and reflects the light output from the LED element by the vibrating mirror to obtain a two-dimensional image, the LED element row to be turned on is the LED for each cycle of the vibrating mirror. It is characterized in that it is provided with control means for switching the order of arrangement of the element rows and controlling the lighting of the LED array so that the lighting timing of the LED element rows is shifted by a predetermined time for each LED element row.

<Operation> First, during the first cycle of the vibrating mirror, the first LED element row is turned on to obtain an image of one frame. Next, during the next cycle of the vibrating mirror, the next LED element row is connected to the first LED above.
The element array is turned on for a predetermined time from the turn-on timing, and the element is turned on to obtain the image of the next one frame. In the following, the LED element rows that are turned on for each cycle of the vibrating mirror are switched in the arrangement order, and the lighting timing is shifted for each LED element for a predetermined time to obtain one frame image for each LED element row. Then, due to the afterimage effect of the eyes, one image is obtained from the image of each one frame by each of the LED element arrays.

<Example> Hereinafter, the present invention will be described in detail with reference to an illustrated example.

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention. The outer shape and mounting procedure of the display of this embodiment are 4,
This is similar to the conventional example shown in FIGS.

In FIG. 1, 1 is an LED array which is a light source,
As shown in FIG. 2B, the LED elements are arranged in two rows in a staggered pattern. Reference numeral 2 is an LED drive circuit for driving the LED array 1 and reference numeral 3 is an oscillating mirror arranged to face the light source in order to obtain a two-dimensional image of the light source. The vibrating mirror 3 is moved by the mirror drive circuit 4 and the mirror drive coil 5 so that the arrow Y
3 → 3a →… → 3a → 3 → 3b →… → 3b → 3 → 3a →…
It is driven so that By driving the vibrating mirror 3, the image of the light source is changed to 6 → 6a → ... → 6a → 6 → 6b → ... → 6b → 6.
→ 6a → ... and a two-dimensional image can be obtained from the one-dimensionally arranged LED array 1. Reference numeral 7 is a lens for enlarging and displaying the two-dimensional image obtained by the mirror 3, and 8 is an observation position of the display device. Further, 10 is an image information storage circuit for storing image information to be displayed on this display device, and 11 is a control circuit. Based on the detection signal from the mirror position detector 12 that detects the position of the vibrating mirror 3 and the image information stored in the image information storage circuit 10, the control circuit 11 mirrors the mirror drive signal and the LED drive signal, respectively. The output is output to the drive circuit 4 and the LED drive circuit 2 to control the display.

Under the control of the control circuit 11, the LED array 1 is turned on as shown in FIG.

That is, the control circuit 11 controls the image information for one frame for turning on the LED elements 5 ₁ , 5 ₂ , ..., 5 _n in the odd rows during the first one cycle of the vibrating mirror 3, that is, the first information. Image information from the column to the m-th column is called from the image information storage circuit 10 in the column order, the LED drive circuit 2 is controlled based on the image information, and the LED elements 5 ₁ , 5 ₂ , ..., 5 _n are turned on. . Then, the pixels from the first column to the m-th column are displayed as indicated by a circle. During this time, the LED elements 4 ₁ ,
4 ₂ ,…, 4 _n do not light. Next, during the next one cycle of the oscillating mirror 3, the control circuit 11 causes the LEDs in the even-numbered columns to be read as described above.
Elements _{4 1, 4 2, ...,} 4 n lit, and displays to indicate the pixel from the first column to the m column △ a sign. During this period, the LED elements 5 ₁ , 5 ₂ , ..., 5 _n in the odd columns are not lit. In the same manner, the LED elements in the odd-numbered columns and the LED elements in the even-numbered rows are alternately switched and turned on for each cycle of the vibrating mirror 3, and are displayed by the LED elements in the odd-numbered rows due to the afterimage effect of eyes One screen is displayed by the frame image and the one frame image displayed by the LED elements in the even columns.

Since the odd-numbered LED element rows and the even-numbered LED element rows are separated by the distance d, the lighting start time is delayed by that amount so that the same column display can be seen. Whether to delay the odd-numbered column or the even-numbered column depends on the scanning direction. That is, it is necessary to switch the scanning direction every time the display is turned upside down as shown in FIG.
Along with this switching of the scanning direction, which one is delayed is determined. The switching of the scanning direction may be performed automatically based on the output signal by providing a means for detecting the vertical direction of the display.
It may be performed manually by an operator.

As described above, the display device of the present embodiment is configured so that the LEDs in the odd-numbered columns and the LEDs in the even-numbered columns are not lit alternately in the same frame as in the conventional example, but are switched and lit in each frame. Since it does not require a pixel storage register for delay as in the conventional example, it is therefore inexpensive and the control circuit is extremely simple.

The frame frequency in this method, that is, the vibration frequency of the vibrating mirror is about 50 Hz, but it has been confirmed that flicker is hardly seen even when light is alternately turned on as described above. This is because the TV uses a CRT and sequentially scans with one electron beam, and even-numbered and odd-numbered frames are alternately made, whereas in this method, one row of LEDs is turned on at the same time It is considered that a good screen with little flicker can be obtained because the display is performed on the screen and the display for each column is sequentially performed to form one frame.

In the above embodiment, the number of LED element rows of the LED array is two, but it goes without saying that it is extremely easy to increase the number of rows to increase the density.

<Effects of the Invention> As is clear from the above, the display device of the present invention switches the LED element row to be turned on in the arrangement order of the LED element row for each cycle of the vibrating mirror, and sets the lighting timing of the LED element row. L to shift for each LED element row for a predetermined time
Since it has a control means to control the lighting of the ED array,
There is no need for a register for delay as in the conventional example in which the element row to be turned on is switched for each column, and therefore the cost is low and the control circuit is simple.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention, FIG. 2 is a diagram showing an arrangement of LED elements of an LED array, and FIG.
FIG. 4 is a diagram for explaining the display system in the above embodiment, FIG. 4 is a cross-sectional view of the structure of a general display device, FIG. 5 is an outline view of a general display device, and FIG. A diagram explaining that the up and down directions of the display are interchanged when viewed with
FIG. 7 is a view showing a state where the operator wears the display device,
FIG. 8 is a circuit diagram of an LED driver of a conventional display device. 1 ... LED array, 2 ... LED drive circuit, 3 ... vibration mirror, 4 ... mirror drive circuit, 5 ... mirror drive coil, 6 ... display image, 7 ... lens, 10 ... image information storage Circuit, 11 …… Control circuit, 12 …… LED drive circuit.

Claims (1)

(57) [Claims] 1. An LED element array in which a plurality of LED elements are linearly arranged is arranged in parallel with each other, and the LEDs of each LED element array are arranged.
It has an LED array in which the elements are arranged so that they do not overlap with the LED elements of other LED element rows in the direction orthogonal to the array direction.
In a display device in which the light output from the D element is reflected by a vibrating mirror to obtain a two-dimensional image, the LED element row to be turned on is switched in the arrangement order of the LED element row for each cycle of the vibrating mirror. A display device comprising a control means for controlling the lighting of the LED array so as to shift the lighting timing of the LED element array for each LED element array by a predetermined time.