JP2823330B2 - Small display device - Google Patents

Description

The present invention relates to a small display device suitable for various electronic devices such as a computer and a video tape recorder.

(B) Conventional technology At present, the display devices of the above electronic devices have been showing various trends such as enlargement and thinning, and one of them is personalization.

As an example of such a small display device for personal use, a one-dimensional image in the horizontal scanning direction by a light emitting array in which a plurality of LED (light emitting diode) elements are linearly arranged is vibrated in a vertical scanning direction by a vibrating mirror. One that obtains a two-dimensional image and enlarges and observes the two-dimensional image is disclosed in JP-A-279284 [G09F
9/00]. FIG. 4 shows a schematic configuration of this conventional device, in which (1) shows a light emitting array in which a number of LED elements are arranged in a direction perpendicular to the plane of the paper, and (2) shows a one-dimensional image by the light emitting array. A vibrating mirror that reflects while rotating and vibrating in the direction of the arrow, and (3) is a convex lens for enlarging a two-dimensional image (virtual image) (A) obtained by the vibrating mirror and leading it to the observer's eyes (B).

On the other hand, (4) is an input terminal to which a composite video signal is input, (5) is a video signal input circuit for performing characteristic correction and amplification of the input video signal, and (6) is a synchronizing signal and video from the output video signal. It is a synchronization / video separation circuit for separating signals. (7) is a control circuit that obtains the separated horizontal and vertical synchronization signals and controls each circuit described later;
(8) is a drive pulse generating circuit for generating a mirror drive pulse synchronized with reading of a buffer memory described later by the control circuit, and (9) excites the drive coils (10) and (10) in response to the drive pulse. A mirror driving circuit for rotating and vibrating the vibrating mirror (2). Further, (11) is a buffer memory for storing the video signal from the above-mentioned circuit (6) in frame units, and (12) is a video read out from the buffer memory (11) by one horizontal line by the control circuit (7). An LED driving circuit for applying a signal to the light emitting array (1).

This device is housed in a small housing (14) as shown in FIG. 5, and is arranged directly in front of the user's eyes (B) by, for example, being mounted on the head. It has become. Although the same reference numerals in FIG. 4 denote the same components as those in FIG. 4, (15) denotes a printed circuit board on which each circuit except the mirror driving circuit (9) is mounted.

(C) Problems to be Solved by the Invention According to the above conventional device, the entire device can be sufficiently reduced in size,
In addition, although a relatively large image can be observed, there is a major drawback that the image is displayed in monochrome.

Therefore, the present invention provides a small-sized display device using a one-dimensional light-emitting array, a vibrating mirror, and an enlarging lens as described above, without complicating the optical system and increasing the size of the device. The purpose is to realize the realization.

(D) Means for Solving the Problems The display device of the present invention includes three light-emitting arrays in which a plurality of RGB LED elements are linearly arranged, and RB light-reflecting surfaces. A prism means for combining light from the array, a vibrating mirror for reflecting combined output light from the prism means, and an enlarging lens means are combined.

(E) Operation According to the above configuration, the light from each of the light emitting arrays is combined by the prism means, and the combined output light is reflected by the vibrating mirror to display a two-dimensional full-color image. It is observed by being enlarged by the lens means.

(F) Embodiment FIGS. 1 and 2 show an embodiment of a small-sized display device according to the present invention, and FIG. 1 is a schematic view showing the operation principle. 4, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted. Only the other portions will be described. (21) is an R light emitting array in which a plurality of red LED elements (Ri) are linearly arranged as shown in FIG. 2 (a), and (22) and (23) are the same G light emitting array and B light emitting array, respectively. , (24) denote prism means for color synthesis having the light-emitting arrays (21), (22), (23) attached to their respective incident end faces, and the exit surface (24a) of which is reflected by the oscillating mirror (2). It is arranged so as to face the surface.

The prism means (24) is composed of three plate-like prisms (25) to (27) each having a thickness direction perpendicular to the plane of the drawing as shown in an enlarged manner in FIG. The R reflecting film is provided on the joining surface (25a) of the R prism (25) with the G prism (26), and the R reflecting film is provided on the B prism (27).
The B reflection film is formed on the joint surface (26a) with the prism for use (25), and the reflection surface is formed on the joint surface (26a) of the prism for G (26) with the prism for R (25). The structure is such that no film is formed. The prisms (25) to (27) are adhered to each other with a transparent adhesive having substantially the same refractive index as the prism.

Therefore, according to this structure, the G light emitting array (22)
The light (g) from the light-emitting array (21) goes straight through the prisms (26), (25) and (27) in this order and emerges from the exit surface (24a), while the light (r) from the R light-emitting array (21) is joined. After being totally reflected by the surface (25b), it is selectively reflected by the joint surface (25a) and enters the prism for B (27), and is combined with the light (g) from the G light emitting array (22) to form the emission surface ( 24a). Similarly, the light (b) of the B light-emitting array (22) is once totally reflected by the light exit surface (24a) and then selectively reflected by the joint surface (24a), so that the light (b) from the G light-emitting array (22) is changed. g) and is emitted from the emission surface (24a).
At this time, each end face of each prism is set so that the optical axes of the lights (r), (g), and (b) from the arrays (21), (22), and (23) completely coincide with each other on the emission surface (24a). Is set.

Therefore, a color image for one horizontal line by combining the light from the RGB light emitting arrays (21), (22), and (23) is incident on the vibrating mirror (2), whereby the two-dimensional color image ( A) appears, and the enlarged image is observed by the lens (3) as in the case of FIG.

The video signal processing system shown in FIG. 1 differs from that shown in FIG. 4 in that a color composite video signal is input to the input terminal (4) and that the composite signal
Color demodulation separation circuit for separating and demodulating each signal (13)
Are added, and for each of the RGB signals, a dedicated memory unit (11R) (11G) (11B) and a circuit unit (12R) for the buffer memory (11) and the LED drive circuit (12), respectively
Although (12G) and (12B) are provided, their operations will be easily understood from the description so far, and thus the description thereof will be omitted.

FIG. 3 shows an optical system of another embodiment, and the same reference numerals are given to portions corresponding to those of FIG. 1, and description thereof will be omitted. In this embodiment, a prism means (24) is provided next. And four isosceles triangular plate-like prisms (31) to (34). That is, these four prisms are
As shown in the figure, the first prism (31) is adhered to each other by a transparent adhesive, and an R reflection film is provided on one joint surface (31a) of the first prism (31), and on one joint surface (32a) of the second prism. B
A reflection film is formed, and a B reflection film and an R reflection film are formed on the joint surfaces (34a) and (34b) of the fourth prism (34).
The third prism (33) has a structure in which no reflecting film is formed on both joint surfaces (33a) and (33b).
Each light emitting array (2
1) It will be easily understood from the figure that the lights (r), (g) and (b) from (22) and (23) are synthesized.

(G) Effects of the Invention As described above, according to the present invention, a full-color image can be realized without complicating the optical system and increasing the size of the device, and furthermore, a small display device sufficiently miniaturized for personal use. Can be provided.

[Brief description of the drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a schematic diagram showing the principle of operation, FIGS. 2 (a) and 2 (b) show main components, and FIG. It is a perspective view which shows the optical system of an Example. 4 and 5 show an example of a conventional small-sized display device, FIG. 4 is a schematic diagram showing the principle of operation, and FIG. 5 is a partial sectional view showing an arrangement state of the display device in a housing. FIG. (2): vibrating mirror, (3): convex lens for magnification,
(9): mirror drive circuit, (21) (22) (23): light emitting array, (24): prism means

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-2790 (JP, A) JP-A-1-279284 (JP, A) JP-A-2-47688 (JP, A) JP-A-2- 116889 (JP, A) JP-A-1-128689 (JP, A) JP-A-63-39294 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G09G 3/00-3 / 38 G09F 9/00-9/46 H04N 9/12-9/31

Claims (1)

(57) [Claims] 1. An R light emitting array in which a plurality of red LED elements are linearly arranged, a B light emitting array in which a plurality of blue LEDs are linearly arranged, and a plurality of green LEDs are linearly arranged. An R reflecting surface and a B reflecting surface are formed on a part of a plurality of prisms combined with each other, and light from each of the light emitting arrays is respectively incident on the G light emitting array. A color combining prism unit that emits light, a vibrating mirror for periodically changing a reflection direction of the color combined light from the prism unit, and each light emission to obtain a color two-dimensional image based on each light emitting array. A small-sized display comprising: driving means for vibrating the vibrating mirror in synchronization with a video signal supplied to an array; and enlarging lens means for obtaining an enlarged virtual image of a two-dimensional image by the vibrating mirror. B devices.