JPS63136074A - Liquid crystal display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a liquid crystal display device with improved viewing angle dependence.

(Prior Art) FIG. 5 is a block diagram of a liquid crystal color display device, in which flat glass substrates 2 and 3 as light-transmitting substrates are arranged facing each other using a spacer 1 as a support. A common type lI4 is introduced between the glass substrates 2.3 through the spacer 1 and the glass substrate 2, and a plurality of pixel electrodes 5-1, 5-2... are arranged on a plane on the glass substrate 3. The common electrode 4 and each pixel electrode 5-1, 5-2, . . . are arranged to face each other. And, in the portion corresponding to each pixel electrode 5-1.5-2 between the common electrode 4 and the glass substrate 2, each monochromatic color filter 6-1.6-2 of the three primary colors of light is provided. is located.

Then, the common electrode 4 and each pixel electrode 5-1, 5-2...
An alignment film 7.8 is arranged between and, respectively, and a liquid crystal 9 is inserted between these alignment films 7.8. Note that 10.11 is a polarizing plate, and 12-1.12-2.
... is a transistor.

For color display, a light source 13 is arranged to irradiate light into the liquid crystal 9 through the glass substrate 3. In this state, when a voltage is applied between the common electrode 4 and a predetermined pixel electrode 5-1, 5-2..., light with the wavelength of the color filter 6-1, 6-2... It will pass.

By the way, the optical path output from the display device will be explained with reference to FIG. 6 showing an enlarged view of part A. The optical path is determined almost by the refraction characteristics of the liquid crystal 9. The light radiation range θ for each pixel is approximately ±30" to ±55°. Therefore, the image can be seen clearly when viewed from the front of the display device, but if you look at the display screen from a different angle, Because the light emission range θ is narrow, it may not be possible to see clearly, or in the worst case, the image may not be visible at all, and it is dependent on the viewing angle.

(Problems to be Solved by the Invention) As described above, conventional display devices have viewing angle dependence.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid crystal display device that can emit light at a wide angle and eliminate viewing angle dependence.

[Structure of the Invention (Means for Solving Problems)] The present invention provides a common electrode and a plurality of pixel electrodes that are disposed facing each other with a liquid crystal interposed therebetween, and a transparent substrate sandwiching the common electrode and the pixel electrodes. In a liquid crystal display device comprising:
This is a liquid crystal display device in which a curved portion is formed at least in each portion of a transparent substrate facing a pixel electrode to provide a lens function.

By providing such a means, for example, when light passes through a curved portion formed at each portion of the transparent substrate facing the pixel electrode, the radiation angle of the light is widened at this curved portion.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 5 are given the same reference numerals, and detailed explanation thereof will be omitted. FIG. 1 is a configuration diagram of a liquid crystal display device. A common electrode 2 is provided on the outside of the alignment film 7 when viewed from the liquid crystal 9.
0 is arranged, and a glass substrate 21 is arranged outside this common electrode 20, and these alignment films 7 and common electrodes 20
and a glass substrate 21 are laminated. The glass substrate 21 has curved portions 22-1, 22-2, . These curved portions 22-1, 22-2...
are each circular and have a recess formed in the glass substrate 21.

These curved portions 22-. Between 1.22-2... and the common electrode 20, there are color filters 2 for each of the three primary colors of light.
3-1, 23-2... are provided. In addition, the first
The light source is omitted in the figure.

Next, the optical path of the display device constructed as described above will be explained with reference to FIG. 2, which is an enlarged view of part B. The light from the light source that has traveled through the liquid crystal 9 passes through the alignment film 7 and the common ii & 20 and enters the color filter 23-2. Then, only the wavelength that matches the wavelength of this color filter 23-2 passes through and reaches the curved portion 22-2. Then, the light of this wavelength is refracted at this curved portion 22-2, enters the glass substrate 21, and further
The light is refracted at the interface between the light and the polarizing plate 10 and is emitted.

Incidentally, in reality, light is bent within the liquid crystal 9 as shown in FIG. It can be changed.

In this way, in the above embodiment, the curved portions 22-1, 22-2, etc. are formed at the portions of the glass substrate 21 corresponding to the respective pixel electrodes 5-1, 5-2, and so on. The light is refracted by these curved portions 22-1, 22-2, etc., and the light of each of the three primary colors is emitted with an expanded radiation range. As shown in Fig. 3, the radiation range is expanded to the critical angle of the glass substrate 21, that is, ±90'', so the image can be clearly seen from any direction.Therefore, there is no dependence on the viewing angle. .

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, as shown in FIG. 4, a curved portion is formed by curving the alignment film 30, common electrode 31, and color filter 32 at a predetermined radius of curvature at a portion facing each pixel electrode 5-1, 5-2, etc. Alternatively, the density of the glass substrate 21 may be changed to change the refractive index.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a liquid crystal display device that can emit light at a wide angle and eliminate viewing angle dependence.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a liquid crystal display device according to the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the device of the present invention, and FIG. 4 is a modification of the device of the present invention. A diagram showing
FIG. 5 and FIG. 6 are diagrams for explaining the conventional device. 1... Spacer, 3, 21... Glass substrate, 5-1
゜5-2.5-3... Pixel electrode, 7.8... Alignment film, 9... Liquid crystal, 10.11... Polarizing plate, 12-1゜12-2.12-3. ... Transistor, 20... Common electrode, 22-1.22-2.22-3... Curved part,
23-1.23-2.23-3...Color filter. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4

Claims (1)

[Claims] In a liquid crystal display device in which a common electrode and a plurality of pixel electrodes are disposed facing each other with a liquid crystal interposed therebetween, and a transparent substrate is provided to sandwich the common electrode and the pixel electrodes, at least the pixel electrode on the transparent substrate 1. A liquid crystal display device characterized in that a curved portion is formed in each portion facing the liquid crystal display device to provide a lens function.