JP2966780B2 - Lenticular lens and three-dimensional display device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lenticular lens and a three-dimensional display device using the same, and more particularly, to a lenticular lens which enables ideal stereoscopic viewing at an arbitrary pixel pitch and can be manufactured by a conventional manufacturing apparatus. And a three-dimensional display device using the same.

[0002]

2. Description of the Related Art A stereoscopic display device using a lenticular lens is a typical stereoscopic display device capable of stereoscopically viewing an image without using special glasses. As shown in FIG. The left-eye image IL and the right-eye image IR, which are alternately lined up with each other, are passed through a lenticular lens 10 in which a semi-cylindrical lens is continuous at a constant lens pitch L, and an interocular distance E
The left eye EL and the right eye ER on which the image is placed are visually separated so that a stereoscopic effect is obtained by the parallax.

In a stereoscopic display device using the lenticular lens 10, a typical method for determining the lens pitch L of the lenticular lens 10 is as follows based on the interocular distance E and the pixel pitch P of the screen 20. There is a method to obtain by:

[0004]

L = 2PE / (P + E)

An ideal interocular distance E is generally 65 m.
m.

[0006]

In recent years, a high-definition display device having a pixel pitch P of 0.11 mm has been manufactured. In such a display device, two points having an ideal interocular distance E are provided. In order to converge light to
Must be set to 0.219628... Mm.

However, a conventional manufacturing apparatus for manufacturing the lenticular lens 10 is configured such that the lens pitch L can be controlled only in units of 0.1 μm. Therefore,
0.2197mm where lens pitch L is larger than ideal
Alternatively, a lenticular lens 10 of 0.2196 mm smaller than ideal can be manufactured, but an ideal 0.21 mm for a screen 20 having a pixel pitch of 0.11 mm.
The lenticular lens 10 having a lens pitch L of 9628... Mm cannot be manufactured.

Therefore, if the lenticular lens 10 manufactured by the conventional manufacturing apparatus is used, if the pixel pitch P is 0.11 mm, the interocular distance E can be calculated according to the following equation 2 derived from the above equation 1. For example, when the lens pitch L is 0.2197 mm, it becomes 60.4 mm, and when the lens pitch L is 0.2196 mm, it becomes 80.6 mm. In any case, the ideal interocular distance E greatly deviates from 65 mm. And it becomes impossible to stereoscopically view the image.

[0009]

E = LP / (2P-L)

The present invention has been made in view of the above circumstances, and provides a lenticular lens capable of producing an ideal stereoscopic view at an arbitrary pixel pitch and which can be manufactured by a conventional manufacturing apparatus. It is an object to provide a display device.

[0011]

In order to achieve the above object, a lenticular lens according to the present invention is entirely divided into a plurality of cycles in the lens pitch direction, and the lens pitch in each cycle is not uniform. The average lens pitch of each cycle is formed to be an ideal lens pitch calculated from the interocular distance and the pixel pitch.

A three-dimensional display device according to the present invention is characterized by using the lenticular lens according to the present invention to achieve the above object. According to the lenticular lens of the present invention, since the average lens pitch of each cycle is formed to be the ideal lens pitch calculated from the interocular distance and the pixel pitch, the light transmitted through each lens from each pixel on the screen As in the case of a lenticular lens having a uniform ideal lens pitch (ideal lens pitch), the light is separated and converged at two points having substantially the same distance as the ideal interocular distance (65 mm). The non-uniformity of the lens pitch in each cycle is negligible. As a result, a stereoscopic effect similar to that in the case of using a lenticular lens having a uniform lens pitch equal to the ideal lens pitch is perceived, and an ideal stereoscopic view can be obtained with respect to an arbitrary pixel pitch. Ideal stereoscopic vision can be achieved even with a small pixel pitch.

Since the lens pitch in each cycle may be non-uniform, different lens pitches may be mixed in units of processing accuracy of a manufacturing apparatus, for example, different lens pitches may be mixed in 0.1 μm units of processing accuracy of a conventional manufacturing apparatus. By doing so, it is possible to form the average lens pitch of each cycle to be the ideal lens pitch, and therefore, it is possible to manufacture the lenticular lens of the present invention with a conventional manufacturing apparatus capable of controlling the lens pitch in units of 0.1 μm. it can.

In the present invention, three or more lens pitches may be mixed in each cycle. However, in order to simplify the control of the manufacturing apparatus, the lens pitch in each cycle is set to 2 or more.
Preferably, for example, the lens pitch is larger than the ideal lens pitch and can be manufactured by the conventional manufacturing apparatus and is closest to the ideal lens pitch, and the lens pitch is smaller than the ideal lens pitch and manufactured by the conventional manufacturing apparatus. It is preferable to mix a lens pitch that is possible and closest to the ideal reds pitch in each cycle.

When two types of lens pitches that can be manufactured are mixed in each cycle as described above, the mixing ratio can be easily calculated by a so-called crane calculation, for example, with respect to a pixel pitch of 0.11 mm. A lens pitch of 0.2197 mm, which is larger than the ideal lens pitch of 0.21963 mm and is closest to the ideal lens pitch that can be manufactured by the conventional manufacturing apparatus, and a lens pitch of less than the ideal lens pitch of 0.21963 mm, and the conventional manufacturing apparatus When combining with a lens pitch of 0.2196 mm closest to the ideal lens pitch that can be manufactured, 0.2
197 mm and 0.2196 mm may be randomly mixed at a ratio of 3: 7.

Although the lenticular lens according to the present invention is used in the stereoscopic display device of the present invention, the lenticular lens may be used in the same manner as the conventional lenticular type stereoscopic display device. For example, it may be arranged in front of the screen in parallel with the screen so that the pitch direction of the lens is left and right. Other configurations of the three-dimensional display device of the present invention are not directly related to the present invention, and the description of the lenticular lens is the same as that described above.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the lenticular lens 1 according to one embodiment of the present invention is formed so that a number of cycles C are continuous in the pitch direction of the lens. In each cycle C, as shown in FIG. 4, a large number of continuous lenses are continuously formed. As shown in FIG. 3, these lenses have two types of lens pitches A randomly mixed at a predetermined ratio. , B in order, so that the average lens pitch in each cycle C is equal to the ideal lens pitch L calculated from the ideal interocular distance and the pixel pitch P.

The ideal lens pitch L is obtained by using the above-described formula (1) as follows.
It was calculated as 1 mm, and 0.21963 m
m. The precision of the lens pitches A and B is a value in units of 0.1 μm that can be controlled by a conventional manufacturing apparatus, is larger than the ideal lens pitch L, and is 0.2197 mm (A) closest to the ideal lens pitch L. ) And 0.2196 mm (B), which is a value in units of 0.1 μm that can be controlled by a conventional manufacturing apparatus, is smaller than the ideal lens pitch L, and is closest to the ideal lens pitch L.

The ratio between the two types of lens pitches A and B is determined by so-called Tsuru-Kame calculation.
3: 7. According to the lenticular lens 1, the average lens pitch in each cycle C is equal to the ideal interocular distance E
And the ideal lens pitch L calculated from the pixel pitch P, the light transmitted through the lenticular lens 1 from each pixel on the screen is different from that of a lenticular lens having a uniform ideal lens pitch. Similarly, it converges to two points at the same interval as the ideal interocular distance E (65 mm). Also, the lens pitches A and B in each cycle
Is about 0.1 μm and can be ignored by naked eyes. As a result, according to the reticular lens 1, a three-dimensional effect similar to that in the case of using a lenticular lens having a uniform lens pitch equal to the ideal lens pitch is perceived. Moreover, since the average lens pitch in each cycle C is calculated from the ideal interocular distance E and the pixel pitch P, the pixel pitch P can be arbitrarily selected.

Since the lens pitches A and B in each cycle C are formed with an accuracy of 0.1 μm unit, the lenticular lens 1 of the present invention can be manufactured by a conventional manufacturing apparatus. In the above-described embodiment, a lenticular lens having a continuous semi-cylindrical lens has been described. However, a similar effect can be obtained with a lenticular lens including a distributed refractive index lens.

[0021]

As described above, in the lenticular lens of the present invention, the entire lens pitch is divided into a plurality of cycles, and the average lens pitch in each cycle is calculated from the interocular distance and the pixel pitch. The light transmitted through this lenticular lens from each pixel of the screen is formed at two points at the same interval as the ideal interocular distance, as in the case of a lenticular lens having a uniform ideal lens pitch. Left and right are separated and converged, and the non-uniformity of the lens pitch in each cycle is negligible to the naked eye. , An ideal stereoscopic view can be obtained with respect to an arbitrary pixel pitch. Also it allows ideal stereoscopic for small pixel pitch.

Further, according to the lenticular lens of the present invention, the lens pitch is made non-uniform in each cycle, so that a plurality of lens pitches differing in units of processing accuracy of the conventional manufacturing apparatus are mixed in each cycle. For example, 0.
It can be manufactured by a conventional manufacturing apparatus capable of controlling the lens pitch in units of 1 μm, which is advantageous in reducing costs.

Also, in the stereoscopic display device of the present invention, since the lenticular lens of the present invention is arranged in front of the screen, the average lens pitch of each cycle for a screen having an arbitrary pixel pitch is defined as the ideal lens pitch of the screen. By making them equal, a stereoscopic image similar to the case of using a lenticular lens whose lens pitch is uniformly equal to the ideal lens pitch can be viewed.

Further, according to the stereoscopic display device of the present invention, since the lens pitch in each cycle of the lenticular lens is made non-uniform, a plurality of lens pitches differing in the unit of processing accuracy of the conventional manufacturing apparatus are used in each cycle. Can be manufactured using a conventional manufacturing apparatus capable of controlling the lens pitch in units of 0.1 μm, for example, which is advantageous in reducing costs.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a three-dimensional display device using a lenticular lens.

FIG. 2 is a front view of the lenticular lens of the present invention.

FIG. 3 is a sectional view of one cycle of the lenticular lens of the present invention.

FIG. 4 is a perspective view of the lenticular lens of the present invention.

[Explanation of symbols]

 A, B Lens pitch C cycle

Claims (2)

(57) [Claims] 1. An entire system is divided into a plurality of cycles in a lens pitch direction, a lens pitch in each cycle is non-uniform, and an average lens pitch in each cycle is calculated from an ideal interocular distance and an arbitrary pixel pitch. A lenticular lens formed to have an ideal lens pitch. 2. A three-dimensional display device using the lenticular lens according to claim 1.