JP2007240637A - Light emission type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emission type display device capable of suppressing the reflection of outside light therein, thereby enhancing contrast and reducing power consumption. <P>SOLUTION: The light emission type display device 10 has: a display substrate 11 which emits display light L from pixels 16, a front substrate 12 having a light shielding part 18 which absorbs incident light OL from the outside and a plurality of openings 19 arranged at the same pitch as arrangement pitch of the pixels 16 and a lens member 18 arranged between the display substrate 11 and the front substrate 12 corresponding to the respective pixels 16. The display light L emitted from the pixels 16 is condensed by the lens member 13 and emitted to the outside from the openings 13. In addition, the incident light OL from the outside is absorbed by the light shielding part 18 and reflected light is suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a self-luminous display device, and more particularly to a self-luminous display device used for image display such as a television receiver or a computer.

In recent years, the image quality of a self-luminous flat panel display such as a plasma display or an organic EL has been improved and has been widely used for various monitors and TV applications for home use. However, in a bright room environment, the contrast is lowered due to the influence of external light reflection, and visibility is a problem.
In order to solve this problem, for example, a filter using a translucent material such as dark glass having a transmittance of more than 50% is known (see, for example, Patent Document 1). Further, a method of providing a circularly polarizing filter on the front substrate is known (see, for example, Patent Document 2).
JP 2000-164145 A JP 11-242933 A

Generally, in order to obtain good visibility in a bright place, the contrast ratio of the display is required to be 50: 1 or more. However, in the plasma display panel described in Patent Document 1, external light reflection of 25% or more occurs, which is not necessarily sufficient as an effect of reducing the decrease in contrast, and further improvement has been desired. Moreover, since the plasma display panel described in Patent Document 2 has a mechanism for cutting reflected light, it is difficult to sufficiently suppress reflection according to the scattering characteristics of the reflecting surface, the incident angle of external light, and the like.
The present invention has been made in view of the above circumstances, and an object thereof is to suppress reflection of external light in a self-luminous display device, thereby improving contrast and reducing power consumption. To provide a mold display device.

The above object of the present invention is achieved by the following self-luminous display device.
(1) A self-luminous display device that emits display light from a plurality of pixels provided on a display substrate to display an image, a light-shielding portion that absorbs incident light from the outside, and an arrangement pitch of the pixels A plurality of openings arranged at the same pitch, and a front substrate disposed in front of the display light emission direction of the display substrate, and between the display substrate and the front substrate corresponding to each pixel A self-luminous display device.

  According to the self-luminous display device having the above-described configuration, a light shielding unit that absorbs incident light from the outside and a plurality of pixels arranged at the same pitch as the pixel arrangement pitch in front of a display substrate provided with a plurality of pixels. A front substrate having an opening is disposed. A lens member provided with lenses at an arrangement pitch corresponding to the pixels is disposed between the display substrate and the front substrate. The display light emitted from each pixel is collected by a lens corresponding to each pixel and is emitted through the opening of the front substrate. Further, most of the incident light incident from the outside is absorbed by the light shielding portion, and only a part of the light is incident on the inside. Accordingly, reflection of external light can be suppressed and the background luminance of the image can be lowered, thereby improving contrast and reducing power consumption.

  (2) The light shielding portion is an external light absorption layer formed on an outer surface or an inner surface of the front substrate, and the lens member directs the display light emitted from the pixels toward the opening. The self-luminous display device according to (1), wherein the self-luminous display device is a microlens array provided with a plurality of condensing microlenses.

  According to the self-luminous display device having the above configuration, the light shielding portion is an external light absorption layer formed on the outer surface or the inner surface of the front substrate, and the lens member uses the display light emitted from each pixel as an opening. Since the microlens array is provided with multiple microlenses that converge toward the surface, incident light is efficiently absorbed by the external light absorption layer to suppress reflected light, and multiple apertures and microlenses are positioned accurately. It can be easily manufactured corresponding to each pixel.

 (3) The self-luminous display device according to (1) or (2), wherein the self-luminous display device is a plasma display panel.

  According to the self-luminous display device having the above configuration, it is possible to easily obtain a plasma display panel that suppresses reflection of external light to improve contrast and reduce power consumption.

  According to the present invention, the black matrix having openings corresponding to the pixel arrangement pitch is provided on the front substrate disposed in front of the display substrate. In addition, a self-luminous type that improves contrast and reduces power consumption by suppressing external light reflection by arranging a microlens array with a plurality of microlenses formed at an array pitch corresponding to the pixels on the display substrate surface A display device can be provided

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view of a plasma display panel (PDP) to which the present invention is applied, and FIG. 2 is a longitudinal sectional view of the plasma display panel.
As shown in FIGS. 1 and 2, the plasma display panel 10 includes a display substrate 11, a front substrate 12, and a lens member 13. The display substrate 11 includes a pair of glass substrates 14 and 15 that face each other with a discharge space interposed therebetween. Although not shown in detail, on the front glass substrate 14, strip-shaped electrode groups including scan electrodes and sustain electrodes covered with a dielectric layer and a protective film are arranged in parallel to each other. On the rear glass substrate 15, strip-shaped data electrode groups are arranged in parallel to each other in a direction orthogonal to the strip-shaped electrode group, and a pixel 16 is formed at each intersection thereof. Further, the glass substrate 15 is provided with a strip-like partition for isolating the data electrode and forming a discharge space in which a rare gas such as helium or neon is enclosed, and extends from the data electrode to the side of the partition. Thus, a phosphor layer is formed.

  Ultraviolet rays are generated by discharging between the scan electrode and the sustain electrode in the discharge space, the phosphor layer is excited by the ultraviolet rays, and visible light from the phosphor layer is emitted from the pixels 16 as display light L.

  The front substrate 12 includes a transparent glass substrate 17 and an external light absorption layer 18 that is a light shielding portion formed on the inner surface 17 a of the transparent glass substrate 17, and is disposed in front of the display light emission direction of the display substrate 11. . The external light absorbing layer 18 is provided with a plurality of small holes 19 which are openings arranged at the same pitch as the arrangement pitch of the pixels 16 of the display substrate 11 to form a black matrix. In other words, when the display substrate 11 and the front substrate 12 are combined, the pixels 16 and the small holes 19 correspond to each other by 1: 1. The material of the external light absorption layer 18 is not particularly limited as long as it is a material that absorbs light and suppresses generation of reflected light. Moreover, the formation method of the external light absorption layer 18 is not particularly limited, and can be formed using, for example, a photoetching method. The external light absorption layer 18 absorbs incident light OL incident from the outside of the plasma display panel 10 and prevents reflected light.

  The lens member 13 is a microlens array 13 in which a plurality of microlenses 13 a are arranged at the same pitch as the arrangement pitch of the pixels 16 of the display substrate 11. Each microlens 13 a is disposed between the display substrate 11 and the front substrate 12 corresponding to the pixels 16 and the small holes 19 of the display substrate 11. The distance between the microlens 13a and the external light absorption layer 18 (front substrate 12) is set to the same length as the focal length of the microlens 13a. Thereby, the microlens 13 a condenses the display light L emitted from the pixel 16 so as to be focused at the small hole (opening) 19. The display light L passes through the small hole (opening) 19 and is emitted outside the panel without being attenuated.

  In the plasma display panel 10 configured as described above, the display light L emitted from the pixels 16 is collected by the microlenses 13a provided corresponding to the respective pixels 16, and is passed through the corresponding small holes (openings) 19. The light passes through the panel without being attenuated. An arbitrary image is displayed by appropriately selecting the pixel 16 from which the display light L is to be emitted, and exciting the phosphor layer by discharging between the scan electrode and the sustain electrode.

  Further, the incident light OL incident from the outside of the plasma display panel 10 is almost absorbed by the external light absorbing layer 18 of the front substrate 12, and only a part of the light is incident inside. Incident light OL that has entered the interior is reflected by the surface of the microlens array 13, the surface of the glass substrate 14, the surface of the dielectric layer, and the like, but the reflected light is absorbed by the external light absorbing layer 18.

  As a result, reflection of external light is suppressed and unnecessary light other than the display light L emitted from the surface of the front substrate 12 is reduced. That is, a clear image with a large contrast ratio can be obtained by reducing the background luminance of the image.

  Next, a modification of the plasma display panel will be described with reference to FIG. FIG. 3 is an exploded perspective view of a modified plasma display panel. The modified plasma display panel 20 is the same as the plasma display panel 10 already described in FIGS. 1 and 2 except that the shape of the microlens array is different. The description will be omitted or simplified.

  As shown in FIG. 3, the modified plasma display panel 20 includes a display substrate 11, a front substrate 12, and a lens member 23. The lens member 23 is a microlens array 23 in which a plurality of cylindrical lenses 23 a are formed at the same interval X as the column interval X of the pixels 16 of the display substrate 11. The display light L emitted from the pixels 16 of the display substrate 11 is collected by the cylindrical lens 23a provided corresponding to each pixel 16 and passes through the corresponding small hole (opening) 19 without being attenuated. Is emitted. Other configurations and operations are the same as those of the plasma display panel 10 shown in FIGS.

  In the above-described embodiment, the self-luminous display device has been described as a plasma display panel. However, the present invention is not limited to this, and can be applied to various types of displays that emit display light from pixels such as an organic EL. And has the same effect.

It is a disassembled perspective view of the plasma display panel to which the present invention is applied. It is a longitudinal cross-sectional view of the plasma display panel shown in FIG. It is a disassembled perspective view of the plasma display panel of a modification.

Explanation of symbols

10 Plasma display panel (Self-luminous display device)
11 Display substrate 12 Front substrate 13 Micro lens array (lens member)
13a Microlens 16 Pixel 18 External light absorption layer (light-shielding part)
19 Small hole (opening)
20 Plasma display panel (Self-luminous display device)
23 Microlens array (lens member)
23a Cylindrical lens L Display light

Claims (3)

A self-luminous display device that emits display light from a plurality of pixels provided on a display substrate and displays an image,
A front substrate that has a light shielding portion that absorbs incident light from the outside, and a plurality of openings arranged at the same pitch as the arrangement pitch of the pixels, and is arranged in front of the display light emission direction of the display substrate; ,
A self-luminous display device comprising: a lens member disposed between the display substrate and the front substrate corresponding to each pixel. The light shielding portion is an external light absorption layer formed on the outer surface or inner surface of the front substrate,
2. The self lens according to claim 1, wherein the lens member is a microlens array provided with a plurality of microlenses for condensing the display light emitted from the pixels toward the opening. Light-emitting display device. The self-luminous display device according to claim 1, wherein the self-luminous display device is a plasma display panel.

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