JPH07146661A - Display device - Google Patents

Abstract

PURPOSE:To eliminate uneven brightnesses caused by louvers in unequal pitch pixels. CONSTITUTION:Intervals of light emitting pixels 8 are constituted into unequal pitches in which small pitches P1 and large pitches P2 are repeated alternately and louvers 3, 3' are provided at upper positions of light emitting pixels 8 of each stage and the thickness of the louver 3' provided in the large pitch P2 is made thicker and the tip part of the upper plane of the louver is protruded more than the tip part of the lower plane of the louver and then the lower directional visible angle of the light emitting pixel 8 being at just upper direction of the louver 3' is made equal to the lower directional visible angle of the light emitting pixel 8 being at just upper direction of the louver 3 provided in the small pitch P1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly to a large-sized display device in which a large number of cells having a plurality of light-emitting pixels are arranged side by side in the vertical and horizontal directions to form the entire display screen.

[0002]

2. Description of the Related Art A large-sized display device for a large number of viewers has been proposed, and a schematic configuration diagram of this type of display device is shown in FIGS. 6 (a) and 6 (b). FIG. 6 (a),
In FIG. 2B, a large number of rectangular parallelepiped cells 1 are arranged side by side in the vertical and horizontal directions without a gap, and the entire display screen 2 is constituted by these cells 1. Louvers 3 projecting forward are provided at regular intervals on the display screen 2, and each louver 3 shields a light emitting pixel 8 (shown in FIG. 7) from outside light such as sunlight.

FIGS. 7A and 7B show a cell 1 having an equal pitch pixel array. In FIGS. 7A and 7B, the case 4 of the cell 1 is a glass body and has a rectangular frame body 4.
a and a front glass body 4b and a rear glass body 4c arranged on the front and rear surfaces thereof. This rear glass body 4
A printed circuit board 5 is arranged on the further rear side of c, and the printed circuit board 5 is provided with connection pins 6 protruding rearward. Electrical connection is made to the outside via the connection pin 6. The outer periphery of the frame body 4a and the rear glass body 4c is covered with a cover 7.

A large number of light emitting pixels 8 are provided on the inner surface side of the front glass body 4b, and the plurality of light emitting pixels 8 are arranged vertically and horizontally at a constant pitch interval P. Each light emitting pixel 8 is divided into an R area, a G area and a B area.

The louver frame A has four louvers 3 arranged in parallel with each other at the pixel pitch interval P.
The louvers 3 are supported by a vertical auxiliary frame portion 9.
The louver frame A thus configured is attached to the front surface of the front glass body 4b, and each louver 3 is arranged above the light emitting pixel 8 in each stage. Since the relative arrangement relationship between the louvers 3 and the light emitting pixels 8 in each stage is constant, the upper viewing angle and the lower viewing angle of the light emitting pixels 8 in each stage are constant. 7 (b), 100% viewing angle, 5
The 0% viewing angle and the 0% viewing angle represent the angle of the pixel area ratio that can be visually recognized.

On the other hand, when the aperture ratio is increased to increase the brightness while maintaining the equal pitch pixels, as shown in FIG.
There is a limit due to the thickness d of a (correctly including the thickness of the cover 7). Specifically, the interval D between adjacent light emitting pixels 8 is set to 2d.
It was not possible to achieve the following, and as a result, it was not possible to desire a high aperture ratio. The aperture ratio is 100 × in FIG.
It is calculated from the formula of (B + R + G) / P × P.

Therefore, in order to increase the aperture ratio, a cell 1 of unequal pitch pixels is proposed, and its configuration is shown in FIG.
(B) and FIG. FIG. 10 (a),
In FIG. 11B and FIG. 11, the light emitting pixels 8 are divided into areas surrounded by alternate long and short dash lines, and each light emitting pixel 8 is expanded so as to widen the area of the four light emitting pixels 8 toward the center O of this area.
The area of is expanded. Therefore, the interval of the light emitting pixels 8 is configured to be a pitch interval in which the small pitch P ₁ and the large pitch P ₂ are alternately repeated. That is, as shown in FIG. 11, by setting the pitch between the light emitting pixels 8 of the adjacent cell 1 to the large pitch P ₂ , the aperture ratio is greatly improved while having the regularity of alternately repeating the two pitch intervals. ing. The louvers 3 of the equal pitch pixels are arranged at equal intervals, but the intervals of the louvers 3 used for the unequal pitch pixels are unequal intervals in which the small pitch P ₁ and the large pitch P ₂ are alternately repeated. Stuff used.

[0008]

However, when the louvers 3 are arranged at unequal intervals as described above, the upper viewing angle is the same for the light emitting pixels in each stage as shown in FIG. 10B, but the lower viewing angle is the same. Is different in each stage of the light emitting pixels. Then, as shown in FIG. 12, when the display device is installed at a place where a person looks up, such as the wall of a building, if the border line that allows viewing without any hindrance to the brightness is set at a 50% viewing angle, the distance S _{1 to} S ₂ from the display screen is set. However, there was a drawback in that the unevenness of brightness was remarkable and the quality of the image was deteriorated.

Therefore, it is an object of the present invention to provide a display device which uses cells of unequal pitch pixels and which prevents uneven brightness due to a difference in downward viewing angle of each stage.

[0010]

In the display device of the present invention for achieving the above object, light emitting pixels are continuously provided in the vertical and horizontal directions of a display screen, and the pixel pitches between the light emitting pixels are unequal intervals. In the display device in which the louvers projecting forward are provided above the respective luminescent pixels, the substantial protrusion amount of the upper surface side tip with respect to the lower surface side tip of each louver is changed to directly above the louver. The downward viewing angle to the light emitting pixel is adjusted.

[0011]

[Function] The lower end of the louver determines the upward viewing angle,
Also, since the top end of the louver determines the downward viewing angle,
By making the dimensions of the lower end of the louver of each stage uniform and varying the protrusion amount of the upper end of the louver of each stage corresponding to the pixel pitch amount, the upper viewing angle of each stage becomes the same and The lower viewing angle of the steps can be the same.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a plan view of a cell of a display device to which the present invention is applied, and FIG. 1 is a sectional view thereof. Figure 1
2 and FIG. 2, the configuration of the cell 1 itself is similar to that of FIGS. 10 (a) and 10 (b) described in the conventional example, and the pixel pitch is such that the small pitch P ₁ and the large pitch P ₂ are alternately repeated. It is composed of pixel pitches. Therefore, the configuration of the cell 1 is given the same reference numeral in the drawings as the conventional example, and the description thereof will be omitted. Only the configuration of the louver frame A different from the conventional example will be described.

A perspective view of the louver frame A is shown in FIG. 3 (a), and a partially enlarged sectional view thereof is shown in FIG. 3 (b). 3 (a) and 3 (b), the louver frame A is made of aluminum die-cast, and four louvers 3 and 3'parallel to each other are arranged in the vertical direction.
3'is supported by a plurality of auxiliary frame portions 9. Each of the auxiliary frame portions 9 is arranged so as to be positioned in a space other than the light emitting pixel 8 when attached to the cell 1. Further, the four louvers 3, 3 'are the same small pitch P ₁ and the pixel pitch mentioned above from above, the large pitch P _2, are arranged at intervals of a small pitch P _1.

Further, the four louvers 3 and 3'are 2
There are various types, and the louvers 3 in the second and fourth stages from the top, which are arranged between the small pitches P ₁ of the light emitting pixels 8, have a thin plate thickness and a length dimension from the tip to L ₁ . Disposed between the large pitch P ₂ of the light emitting pixels 8, the first stage and the louver 3 of the third stage 'Above thick plate thickness, length up to the lower surface side tip L
_Although it is ₁ , the tip on the upper surface side projects from the tip on the lower surface side, and the length dimension to the tip on the upper surface side is L ₂ . That is, the upper surface side tip projects from the lower surface side tip by (L ₂ −L ₁ = δ), and this projection amount δ has a downward viewing angle to the light emitting pixel 8 immediately above the louver 3 ′ immediately after the other louver 3. It is set to be the same as the downward viewing angle (with respect to the 50% viewing angle) with respect to the upper light emitting pixel 8. In this embodiment, the viewing angle is set to be the same at 50% viewing angle, but the viewing angle can be appropriately changed according to the usage status of the display device, the purpose of use, and the like. A groove 10 is formed between the top end and the bottom end.

The louver frame A thus constructed is attached to the front surface of the front glass body 4b of the cell 1 as shown in FIGS. 1 and 2, and each louver 3, 3'is provided with a light emitting pixel 8 at each stage. Is arranged at a position above which the light emitting pixel 8 immediately above is not shielded.

In the above structure, as shown in FIG. 1, 'underside tip determines the upper viewing angle, the louver 3,3' all length to the lower surface side tip same L ₁ of each louver 3,3
Therefore, the upward viewing angle is uniform for the light emitting pixels 8 in each stage. In this embodiment, the 0% viewing angle is 29.0 degrees, 5
Each 0% visual recognition is 15.7 degrees and 100% visual recognition is 0.6 degrees.

Further, the tip of the upper surface side of each louver 3, 3'determines the downward viewing angle, and the upper surface side of the louver 3'of the first and third steps is different from the louver 3 of the second and fourth steps. Since the tip projects by δ, the downward viewing angle is uniform for the light emitting pixels 8 in each stage, even though the pixels are unequal pitch pixels.
In this embodiment, the 0% viewing angle is 37.3 degrees, the 50% viewing angle is 25.9 degrees, and the 100% viewing angle is 13.3 degrees.

Therefore, since external light such as sunlight is blocked by a uniform incident angle and the downward viewing angle is uniform,
The image quality is maintained with almost no uneven brightness. As shown in FIG. 4, when the display device is installed at a height of 18 meters from the ground, a borderline that allows viewing without any hindrance to the brightness is a point at a viewing angle of 50%, and the point is 48.5 meters or more away (the height of the line of sight). From 1.5 meters), you will be able to see a proper image without uneven brightness.

Further, since the concave groove 10 is formed on the tip end surface of the louver 3'having a large plate thickness, reflection of external light does not occur and the quality of the image is not deteriorated.

5 (a) and 5 (b) show modifications of the louvers 3'used in the first and third stages, respectively. The louver 3'of FIG. 5 (a) has a thin plate thickness, and the tip end side is bent upward so that the tip end on the upper surface side protrudes by a substantial protrusion amount δ with respect to the tip on the lower surface side. This louver 3'is made of sheet metal, which is advantageous in strength when the louver 3'is made of sheet metal.

The louver 3'in FIG. 5 (b) has a thick plate thickness, and the tip side is formed in a taper shape so that the top side tip protrudes from the bottom side tip by a substantial protrusion amount δ. ing. The louver 3'is made of a synthetic resin, and when the louver 3'is made of a synthetic resin material, the cost and the weight are reduced.

Although the louver frame A in FIG. 3 is made of aluminum die-cast, it may be made of sheet metal or synthetic resin material.
The louver 3'in FIG. 5 (a) may be made of aluminum die cast or synthetic resin material, and the louver 3'in FIG. 5 (b) may be made of aluminum die cast or sheet metal.

In the above embodiment, the unequal pixel pitch is P ₁
Although there are two types of louvers 3 and P ₂ , even if there are three or more types, the downward viewing angle of each stage can be made uniform by adding the type of louver 3 ′ accordingly.

[0024]

As described above, according to the present invention, in a cell having an unequal pixel pitch, each louver disposed above each light emitting pixel in each stage is provided with an upper surface side tip with respect to a lower surface side tip. Since the downward viewing angle to the light emitting pixel immediately above the louver is adjusted by changing the substantial projection amount of the above, the effect that the downward viewing angle of each stage can be made uniform and an image without uneven brightness can be displayed There is.

[Brief description of drawings]

FIG. 1 is a sectional view of a cell (example).

FIG. 2 is a front view of a cell (example).

3A is a perspective view of a louver frame, and FIG. 3B is a partially enlarged sectional view of a louver (embodiment).

FIG. 4 is a diagram showing an installation example of a display device (embodiment).

5A and 5B are cross-sectional views (modifications) of the louver.

6A is a front view of a display device, and FIG. 6B is a side view thereof (conventional example).

FIG. 7 (a) is a front view of a cell of equal pitch pixels,
(B)) The sectional view (conventional example).

FIG. 8 is a partially enlarged front view of a cell (conventional example).

FIG. 9 is an explanatory diagram for calculating an aperture ratio (conventional example).

FIG. 10 (a) is a front view of a cell of unequal pitch pixels,
(B) is the sectional view (conventional example).

FIG. 11 is a partially enlarged front view of a cell (conventional example).

FIG. 12 is a diagram showing an installation example of a display device (conventional example).

[Explanation of symbols]

 2 ... Display screen 3, 3 '... Louver 8 ... Emitting pixel 10 ... Recessed groove

Claims (2)

[Claims] 1. A louver which is provided with light-emitting pixels continuously in the vertical and horizontal directions of a display screen, has a pixel pitch between the light-emitting pixels which is not equidistant, and which protrudes forward at a position above each of the light-emitting pixels. In each of the display devices, each of the louvers has a substantially protruding amount with respect to a lower surface side tip of the upper surface side tip that is changed to adjust a downward viewing angle to the light emitting pixel immediately above the louver. apparatus. 2. The louver for reducing the downward viewing angle to the light emitting pixel immediately above has a thick plate thickness, the upper surface side tip projects from the lower surface side tip, and the upper surface side tip and the lower surface side. The display device according to claim 1, wherein a groove is formed between the tip and the tip.