JP2659576B2 - 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. As shown in FIG. 7, the display device 40 can be mounted and used by an operator.

In FIG. 4, reference numeral 41 denotes an LED array as a light source disposed under the housing 42. This LED array, for example,
It is a one-dimensional high-density monolithic array of about 32 dots / mm. Although only one element is shown in this figure, a plurality of elements are arranged in series in a direction perpendicular to the plane of the drawing. If the length of the LED array is about 8.4 mm, the total number of LED elements is 280 dots. Reference numeral 43 denotes a vibrating mirror disposed to face the light source to obtain a two-dimensional image of the light source, and reference numeral 44 denotes a resonance scanner that vibrates the vibrating mirror 43 at high speed. When the LED array 41 is turned on and off in response to the data signal in synchronization with the vibration of the vibration mirror 43, a plane image is displayed on the vibration 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. Also, 45
Is a lens, and the LED array 4
1 is arranged, and the LED reflected by the vibrating mirror 43 is
The light from the array 41 is collimated by the lens 45 and reaches the operator's eyes 46. in this case,
The lens 45 may be provided between the LED array 41 and the vibration mirror 43.

As shown in FIG. 7, the display device 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 support member 71.
Then, the display device 40 is rotated in the lateral direction with the position of the rotation support member 71 as a fulcrum, and is switched to an observation position and a non-observation position.Also, the lead wire 73 does not interfere with work. The clip 74 holds the garment and is connected to a host (not shown) placed elsewhere.
The operator wears the headphone 72 on his / her head and
The image displayed by the display device 40 can be viewed by placing the in front of the user.

As shown in FIG. 5, the display device 40 has a display window 48 so that the user can see the image with one eye while viewing the background (for example, a computer keyboard) with the other eye. The structure is arranged on either one of the right and left. 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 the right eye and looks at the background with the left eye using this device, the device may be used upside down as shown in FIG.

By the way, if the device is turned upside down, the screen looks upside down as it is, so a switch 49 for switching the screen up and down is provided. If the display screen is upside down, this switch 49 is operated to change the screen. It switches between up and down.

The image signal is stored in a data store for one page of the screen, which is constituted by, for example, a DRAM provided on the host side.
The data is transferred to the LED array, but when the up / down switching is performed by operating the changeover switch 49, the order of the pixels to be transferred is converted and sent.

<Problem to be Solved by the Invention> However, this method has a disadvantage that the circuit configuration becomes complicated for the following reason.

The LED arrays are typically arranged in a staggered fashion to increase pixel density, with one row being lit several columns later than the other.

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

The LED array 80 comprises a set of 100 dot LEDs, ie, 1D, 2
D,..., 100D, and another set of LEDs, ie, 1E, 2E,..., 100E, are arranged in a zigzag pattern to form a 200-dot LED array, and the two rows are separated by three columns. . This LED array 80 is a driver 8 including a shift register and a latch.
1,82 are connected by wire bonding. D
d and De are image signals, and the arrow X is the scanning direction due to the vibration of the mirror.

An image of one column by the image signals Dd and De is converted into an array of 200 dots, that is, 1D, 1E, 2D, 2E, 99D, 99E, 100D, 1
In order to display one line on 00E, it is necessary to delay lighting of 1D, 2D,..., 99D, 100D by a time corresponding to three columns. In this way, there is a lighting time difference between the two rows of LEDs, but the lighting images are 1D, 1E, 2D, 2
E, ..., 99D, 99E, 100D, 100E appear to be in a 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, S
R ₂ and SR ₃ are not for making a time difference,
1,82 is intended for changing the arrangement order to correct from sequences because they use the same device becomes reversed, the shift register SR ₀ the phase direction shift register of the driver 81 ( (With up / down function) can be omitted.

It is difficult to change the order of the image signals Dd and De to change the display image up and down by simply changing the order of the pixels transferred from the data store. It can be easily determined if the correspondence is requested for the bit map of.

As described above, in the conventional display device, there is a problem that a circuit is complicated to switch the screen up and down in accordance with the up and down of the device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device capable of switching a screen up and down with a simple circuit.

<Means for Solving the Problems> In order to achieve the above object, the present invention obtains a two-dimensional image by reflecting light output from an LED array arranged in a row with a vibrating mirror driven by a sine wave. And a vertical direction indicating means for indicating whether the device is facing upward or downward, and receiving a signal from the vertical direction indicating means, the device is directed upward. In the rising or falling area of the sine wave, depending on whether
It is characterized by comprising LED array driving means for lighting the LED array and for turning the lighting order forward or backward.

<Operation> In the above configuration, when the up-down direction of the device is reversed, the up-down direction instructing unit instructs the reverse, and in response to a signal from the up-down direction instructing unit, the LED array driving unit operates the LED array lighting timing. Is changed from one of the rising region and the falling region to the other,
Change the lighting order.

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

The display device of this embodiment has the same configuration as that of the conventional display device shown in FIG. 4, and includes therein a gravity sensor as a vertical direction indicating means as shown in FIG. This gravity sensor is a dense air container 1 made of glass or the like.
Provided with two electrodes 2 and 3 penetrating one end of the container 1
A conductive liquid 44 such as mercury in an amount sufficient to immerse the electrodes 2 and 3 therein is placed therein, and the electrode 3 is grounded.
A Vcc voltage of, for example, +5 V is applied to the electrode 2 via the resistor 5, and the vertical direction of the device is output as a U / D (upside-down) signal which is the voltage of the electrode 2. That is, when the display device is turned upward, the space between the electrodes is filled with the liquid 4 as shown in the figure, a current flows through the resistor 5, and the U / D signal becomes "Low" (0 V). On the other hand, when the display device is turned upside down, the liquid 4 moves in the container due to gravity, the liquid 4 is not filled between the electrodes, no current flows through the resistor 5, and the U / D signal becomes “High” (5V). ).

The LED driver of this display device has the same circuit configuration as the LED driver shown in FIG. 8, and switches the image signal circuit as shown in FIG. 3 in response to the U / D signal from the gravity sensor. This makes it possible to switch the screen up and down as described below. FIG. 2 is a diagram showing vibration of a mirror of the display device,
The horizontal axis represents time (t), and the vertical axis represents the angle of vibration (θ). As shown in this figure, the mirror has a sinusoidal motion represented by θ = θmSinωt, and the scanning direction indicated by the arrow X in FIG.
/ 2, T is the cycle) when the LED array is turned on. If the light is turned on between CDs, which is the falling part of the waveform, the scanning direction is reversed.

If the display device is facing up, that is, if the gravity sensor is outputting a “Low” signal, the LED
Turn on the array. Then, when the vertical direction of the display device is reversed, that is, when the gravity sensor outputs a “High” signal, the lighting time of the LED array is switched between CDs.
This is very easy because it only changes the lighting timing of the LED array by about T / 2.

However, as it is, not only the display image is mirror-inverted, but also the odd-numbered rows of LEDs (1D, 2D,…, 100D) and the even-numbered rows of LEs.
Correction of the lighting order of the odd-numbered columns and the even-numbered columns in the staggered LED array 80 composed of D (1E, 2E,..., 100E) is not performed at all.

Therefore, in order to eliminate the mirror inversion and correct the lighting order, the image signal input to the LED drivers 81 and 82 may be exchanged as shown in FIG. That is, from the state of FIG. 8, the terminal E2 is disconnected from the terminal E1 and connected to the terminal D1, and the electron D2 is disconnected from the terminal D1 and connected to the terminal E1 to obtain the state of FIG. In this case, the image signals Dd and De are exactly the same as in FIG. Thus, in the case of FIG. 8, the image signals Dd 1d, 2d,..., 99d, 100d for driving the LEDs 1D, 2D,. , 99E,..., 2E, 1E are respectively driven, and in the case of FIG. 8, the LEDs 1E, 2E,.
1e, 2e, ..., 99e, 100e of the image signal De for driving 0E respectively
Accordingly, the LEDs 100D, 99D,..., 2D, 1D in the case of FIG. 3 are driven, and a screen without mirror inversion and in which the lighting order is corrected can be obtained.

In this way, receiving the U / D signal from the gravity sensor,
By changing the lighting timing of the array 80 and simply switching the image signal input to the LED drivers 81 and 82,
It is very easy to switch the screen up and down.

<Effects of the Invention> As is clear from the above description, in the display device of the present invention, the vertical direction indicating means indicates whether the device is facing upward or downward, and the LED array driving means has In response to a signal from the up / down direction indicating means, depending on whether the device is facing upward or downward, the above-mentioned LED is used in the rising region or falling region of the sine wave driving the vibrating mirror. Light up the array,
Since the lighting order is reversed or reversed,
With a simple circuit, the vertical direction of the screen can be changed according to the vertical direction of the device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a gravity sensor for detecting a vertical direction of a display device according to an embodiment of the present invention, FIG. 2 is a diagram showing a relationship between a vibration angle of a vibrating mirror and time in the above embodiment, and FIG. FIG. 4 is a diagram for explaining switching of the LED driver in the above embodiment, FIG. 4 is a cross-sectional view of the configuration of the conventional example, FIG. 5 is an external view of the conventional example, and FIG. And FIG. 7 is a diagram illustrating a state in which an operator mounts a conventional display device, and FIG. 8 is a circuit diagram of an LED driver in the conventional example. 1 ... Container, 2,3 ... Electrode, 4 ... Conductive liquid, 5 ... Resistance, 41,80 ... LED array, 43 ... Vibrating mirror, 81,82 ... LED driver.

Claims (1)

(57) [Claims] 1. A display device in which light output from an LED array arranged in a row is reflected by a vibrating mirror driven by a sine wave to obtain a two-dimensional image, wherein the device faces upward. Up / down direction instructing means for indicating whether the device is facing down or downward, and receiving a signal from the up / down direction instructing device according to whether the device is facing up or down. And a LED array driving means for lighting the LED array in a rising area or a falling area of the sine wave and for changing the lighting order to normal or reverse.