JPS63271416A - Display device - Google Patents

Abstract

PURPOSE:To contrive the improvement of the uniformity ratio of luminance by providing a long-sized light source for extending toward a display panel, and a plate for reflecting all irradiating light beams to the display panel. CONSTITUTION:A light emitting part 5 of a lamp 2 is extended in a long size to a display panel 1 side, therefore, an irradiating light of a tip part irradiates directly the panel 1, and also the irradiating light of the whole surface of the side part is reflected by a reflecting plate 3 and irradiates the panel 1, and the irradiating light of the light emitting part 5 is utilized effectively. A gentle slanting face 12 and steep slanting faces 14, 15 and 16 of th reflecting plate reflect the irradiating light of the side face of the light emitting part 5 to the peripheral part of the panel 1 where the lamp 2 does not exist, so that the lamp 2 is reflected on all the reflecting surfaces, when it is seen from the front. A middle slanting face 17 is inclined so as to cover the light emitting part 5, and the light emitting part 5 can be seen from both the front and the right and left sides. In such a way, in the case of looking at from the front, the light emitting part 5 of the lamp 2 is reflected on all the reflecting surface, and the reflected light irradiates uniformly the panel 1, therefore, the uniformity ratio of luminance of the display surface can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display device that performs display by irradiating a display panel such as a liquid crystal panel with light emitted from a light source, and particularly to a display device that displays light emitted from a light source. The present invention relates to a display device in which the uniformity of brightness on a display surface is improved by using the present invention.

[Prior Art] FIG. 9 is a side sectional view of a conventional display device shown as a liquid crystal display device in, for example, Japanese Patent Laid-Open No. 59-50425, and FIG. 10 is a plan sectional view thereof. ) is a rectangular display panel such as a liquid crystal panel, (2) is this display panel (
1) A long lamp such as a fluorescent lamp installed parallel to the
(3) displays the irradiated light from this lamp (2) on the display panel (1)
It is a case-shaped reflector that reflects light. The lamp (2) has a structure in which the electrode parts (4) at both ends of the straight fluorescent lamp are bent at right angles on the inside, and the brightness part (5) is parallel to the display panel (1) with a reflector (3). ), and the low-luminance electrode part (4) and base (base) (6) are placed inside the reflector plate (3).
).

In the above display device, the brightness section (
The irradiated light of 5) is irradiated directly or reflected by the reflector plate (3) to the display panel (1) to display an image, etc. on the display panel (1), in this case the A brightness section of the lamp (2). (5)
is placed inside the reflector (3), so the pump (2)
A relatively uniform light emitting surface can be used, and this can be used as a reflector (3).
By combining this, it is possible to uniformly irradiate the entire surface of the display panel (1). Also, the electrode part (4
) is placed outside the reflecting plate (3), so cooling is easy.

[Problem that the invention seeks to solve]

However, in such conventional display devices,
Only the irradiation light from the first half of the long lamp (2) can be used,
Poor utilization efficiency of irradiated light. Also, when viewed from the front of the display panel (1), the illumination is uniform, whereas the viewing angle α□
When viewed from an angle exceeding , α2, some parts are irradiated with the irradiated light or reflected light from the lamp (2.) and some parts are not, and the brightness of the screen becomes non-uniform. and Figures 9 and 1
For figure 0.

The visible angle β0 of the lamp (2) incident on the reflector (3). β
Since the viewing angle α□ is small, uniform brightness can be obtained.

There were problems such as a decrease in α2.

The present invention is intended to solve the above-mentioned problems, and provides a display device that can improve the uniformity of the brightness of the display surface by effectively using the irradiated light of the lamp, and can widen the viewing angle to obtain uniform brightness. The purpose is to obtain.

[Means for solving problems]

The display device of the present invention includes a display panel, a long light source extending toward the display panel from a base provided at one end, and a display device configured to reflect irradiated light from the long light source onto the entire surface of the display panel. The reflector plate is provided with a reflector plate.

[For production]

In the display device of the present invention, the irradiation light from the light source is irradiated onto the display panel either directly or after being reflected by a reflection plate, and an image or the like is displayed on the display panel.

In this case, the light source is long and extends toward the display panel, so the light from its tip directly irradiates the display panel, and the light from the entire side is reflected by the reflector and hits the display panel. The irradiated light from the light source is used effectively and there is no waste. The light reflected by the reflector is uniformly irradiated onto the display panel, improving the uniformity of the brightness of the display surface, and the visible angle is wide because the irradiation light irradiated from the side of the long part enters the reflector. This increases the viewing angle at which uniform brightness can be obtained.

【Example〕

Fig. 1 is a front view of an embodiment implemented in a liquid crystal display device with the display panel omitted, Fig. 2 is its ■-■ cross-sectional view, Fig. 3 is its ■-■ cross-sectional view, and Fig. 4 is its IV-IV cross-section. Figure 5 is a front view of the reflector, Figure 6 is its ■-■ cross-sectional view, and Figure 7 is ■
-■ sectional view and FIG. 8 are perspective views, and in FIG. 1, the same reference numerals as in FIG. 9 and FIG. 1θ indicate the same or corresponding parts.

The display panel (1) is provided on the front side of the display device and consists of a liquid crystal panel or the like. The lamp (2) has a long luminance part (5), and the luminance part (5) extends from the base (6) provided at the rear toward the display panel (1), and its axis line is aligned with the display panel (1).
) is orthogonal to In the embodiment, the lamp (2) has a luminance part (5) consisting of four parallel tubes attached to a base part (6) connected in series by a connecting part (7), and electrode parts (4) at both ends. is formed.

The reflector (3) surrounds the luminance part (5) of the two lamps (2) and has a structure in which two prismatic cone-shaped bodies are connected in series and expand toward the display panel (1). Front opening (8
), the display panel (1) is attached to the rear opening (9).
The inner surface of the reflective plate (3), from which the electrode portion (4) and base portion (6) of the lamp (2) protrude, uniformly reflects the irradiated light from the brightness portion (5) onto the entire surface of the display panel (1). It has a multi-sided structure, with a gentle slope surrounding the front side (11),
(j2) and a steep slope (13) surrounding the rear side.

(14), (15), (16), an intercultivation surface (17) provided in the middle of these corner sides so as to wrap around the ramp (2), and a gentle longitudinal slope (11) protruding from the rear side. It consists of pyramidal surfaces ([1) and (19).

In the display device configured as above, the irradiation light from the luminance part (5) of the lamp (2) is emitted directly or from the reflector (3).
) and illuminates the display panel (1) to display images, etc. on the display panel (1). In this case, the lamp (
Since the brightness section (5) in 2) is long and extends toward the display panel (1), the irradiation light from its tip directly irradiates the display panel (1), and also irradiates the entire side surface. The light is reflected by the reflector (3) and irradiated onto the display panel (1),
The irradiated light from the brightness part (5) of the lamp (2) is effectively used and there is no waste. And in this case, the gentle slope (11), (1
2) and steep slopes (13), (14), (15)
), (16) reflects the irradiated light from the side of the brightness section (5) to the peripheral area of the display panel (1) where there is no lamp (2), and when viewed from the front, the lamp (2) is reflected on all reflective surfaces. is now visible. In addition, the intercultivation surface (17) is sloped so as to wrap around the brightness part (5) of the lamp (2), so that the brightness part (5) of the lamp (2) can be seen from the front and from the left and right. ing. Furthermore, pyramidal surfaces (18), (19)
prevents the irradiated light emitted from the lamp (2) from entering the lamp (2) again, and efficiently reflects it to the four corners that tend to get dark. In this way, when viewed from the front, the brightness portion (5) of the lamp (2) is reflected on all reflective surfaces, and the irradiation light of the lamp (2) is uniformly irradiated onto the display panel (1), improving the symmetry of the display surface. will improve.

Also, since the irradiation light emitted from the side surface of the elongated brightness section (5) enters the reflection plate (3), its visible angle β4. The viewing angle α, which increases β2 and provides uniform brightness.

α2 becomes larger. Therefore, an image with uniform brightness can be obtained even when viewed from a direction shifted from the front.

In the above description, the display panel (1) is not limited to a liquid crystal panel, but may be a photo, screen, or other light transmission type display panel. Further, the lamp (2) is not limited to a four-tube connection type fluorescent lamp, but may be any other elongated light source, and the structure of the reflector (3) is not limited to the one shown, but can be changed. .

〔Effect of the invention〕

According to the present invention, the elongated light source is arranged so as to extend toward the display panel, and the light emitted from the side is reflected onto the display panel by the reflector, so that the light emitted from the lamp can be used effectively. This has the effect of improving the uniformity of brightness on the display surface and increasing the viewing angle at which uniform brightness can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of the embodiment with the display panel omitted, Fig. 2 is a cross-sectional view along ■-■, Fig. 3 is a cross-sectional view along ■-■, Fig. 4 is a cross-sectional view of IV and -IV, and Fig. 5 is a cross-sectional view along ■-■. is a front view of the reflector, Figure 6 is its VI-VI sectional view, Figure 7 is its ■-■ sectional view, and Figure 8 is its VI-VI sectional view.
The figure is a perspective view, FIG. 9 is a side sectional view of a conventional display device, and FIG.
Figure 0 is a plan sectional view thereof. In each figure, the same reference numerals indicate the same or corresponding parts, (1)
is the display panel, (2) is the lamp, (3) is the reflector, (5
) is the luminance part.

Claims (3)

[Claims] (1) A display panel, a long light source extending from a base provided at one end toward the display panel, and a display panel provided so as to reflect irradiated light from the long light source onto the entire surface of the display panel. A display device comprising a reflector. (2) The display device according to claim 1, wherein the light source is a long fluorescent lamp. (3) The display device according to claim 1 or 2, wherein the reflection plate has a multifaceted reflective surface.