JPS60243638A - Liquid crystal color display device - Google Patents

Abstract

PURPOSE:To make effective use of picture elements on an FET side and to improve the visibility around a parting plate by forming the picture elements consisting of only the color filter layers of several picture elements or above to the peripheries of the picture element region where the quantity of light is controlled by a liquid crystal shutter. CONSTITUTION:The liquid crystal display device consists of substrates 1, 3, picture element electrodes 2, the three-color filter layers 4, a transparent electrode 11 over the entire surface, a spacer 5, a nematic liquid crystal sealed between the substrates 1 and 3, polarizing plates 6, 7 and a parting plate 8. The picture elements of the color filters are increased to the peripheries by as much as several picture elements (one picture element in the figure). The direct incidence of the color from a back light 9 onto the naked eyes is thus ovbiated and the visibility around the plate 8 is improved.

Description

[Detailed description of the invention] 〔Technical field〕 The invention relates to a liquid crystal color display device.

Furthermore, the present invention relates to the display quality of a liquid crystal color display device, and particularly to improvement of its color filter.

Liquid crystal displays can be driven at low voltages and with low power, and the number of applications for them has been rapidly expanding in recent years as small, thin flat panel displays.Furthermore, their practical application as image display devices that can replace CRTs is slowing. There is. There are two driving methods for liquid crystal displays: a time-division driving method and an active matrix driving method, and compact LCD TVs using both of these methods have already been released or prototypes have been announced. A prototype full-color LCD TV with vivid colors has also been announced by combining an LCD panel and a color filter. In the future, liquid crystal displays will be small and thin, flat, nice displays.
A wide range of applications are possible.

[Prior art]

Figure 1 shows three color filters and thin film transistors (
1 is a sectional view of a liquid crystal color display device combining an active matrix drive type liquid crystal shutter using TPT)i. The display device includes TPT on which pixel electrodes 2 are formed.
Board 1 and red (R).

A color filter substrate 3 having three color filter layers 4 of green (G) and blue (B) and a transparent electrode 11 formed thereon is bonded together via a spacer 5, and a nematic liquid crystal 10 is sealed in the gap formed. It has become. Furthermore, polarizing plates 6 and 7 are attached to the top and bottom of the display device so as to form crossed Nicols.

Since the non-display device uses a color filter, it is normally used as a transmissive type, so a backlight 9 is installed on the back side. Further, a partition plate 8 is usually used to hide the peripheral portion of the display device. The non-display device controls the source of the backlight by using the so-called twisted nematic mode, in which the decorativeness of the liquid crystal layer is controlled by the voltage applied to each pixel voltage A2. .

Such liquid crystal color display devices also have the following drawbacks. That is, when the screen size of the parting board 8 and the effective screen of the color filter and TPT board are completely matched as shown in FIG. 1, when the screen is viewed from the front, light leakage from the backlight 9 is Although it is not visible, when viewed from an angle like the eye in the figure, there is a small possibility that the backlight source will leak and the appearance will be very poor. In order to prevent this, it is conceivable to make the screen of the parting plate 8 smaller than the entire color filter and the effective screen of the TPT substrate, as shown in FIG.

However, this method results in the destruction of the pixels on the TPT substrate that have been painstakingly fabricated.

〔the purpose〕

The invention was made in view of these problems,
The built-in TFT 111 pixels are effectively utilized,
Moreover, the overall purpose is to lengthen the overall view around the parting line.

〔overview〕

The invention is to make the screen size of the TPT substrate and the screen size of the parting board the same, and add pixels on the color filter side, which can be increased relatively easily, as dummy pixels to the periphery. It's a reed, the color of the surrounding dummy pixels is RG
Although the three colors of B may be used, it is better to unify R or BVc, which have relatively poor transmittance.

〔Example〕

a) Example 1゜In Example 1, as shown in Figure 6, the pixels of the color filter of the liquid crystal color display device in Figure 1 are increased by several pixels ([1 pixel in the figure for simplicity)] around the periphery. be. Figure 4 shows the RGB color filter used in the display device of Example 1.
FIG. 3 is a diagram showing the pattern arrangement of FIG. (In the figure, a part of the first corner of the color filter is shown for simplicity.The dummy pixels are next to the shaded area and are a white device of 4 pixels each on the top, bottom, left and right.) By using a color filter like this, the color of the backlight is not directly visible to the naked eye, and the larvae around the edge are visible. However, such Example IVC also has drawbacks. In other words, if the peripheral dummy pixels are all three primary colors, to the naked eye, it looks close to gray due to color mixing using the edge method, and it looks like there is a linear defect around the parting.

Embodiment 2.6 solves this drawback.

b) Example 2 In Example 2, the color filter color of the peripheral dummy pixels is unified to red or blue with low light transmittance.
The figure shows a sectional view, and FIG. 6 shows the color scheme of the color filter. As can be seen from FIG. 6, all the surrounding dummy pixels are blue.

Among RGB, blue has low visibility characteristics compared to the naked eye.
This would be ideal in such cases since it would be less noticeable.

Embodiment 5 Embodiment 6 is a development of Embodiment 2, and as shown in FIG.
This is a blue filter.

〔effect〕

From Kotoriko using the color filter structure as in Examples 1 to 6, the separation M1 side η≧ of the present liquid crystal color display device
It is important to prevent the backlight from leaking.
The effect of non-invention is enormous. Furthermore, since these filters use the same color as the color filters on the screen, they can be made without increasing the number of steps for producing color filters, and therefore do not cause an increase in cost. In this respect as well, the effect of non-invention is very large. In this application, an active matrix drive method is taken as an example, but it goes without saying that the scope of application of the present invention is not limited to this method.

[Brief explanation of drawings]

FIG. 1: A sectional view of a conventional example of a liquid crystal color display device. 1-TPT substrate, 2-pixel' electrode, 6-color filter substrate, 4-color filter r@. 5-Sealing material, 6.7-Polarizing plate, 8-Parting plate, 9-Backlight, 101-Liquid crystal, 11-Full transparent electrode, Fig. 2...Cross section of an improved example of a conventional method of a liquid crystal color display device figure. FIG. 6: A sectional view of the liquid crystal color display device of Example 1. FIG. 4: Pattern diagram of the color filter of Example 1. FIG. 5: A sectional view of a liquid crystal color display device of Example 2. FIG. 6: A pattern diagram of a color filter of Example 2. FIG. 7: A pattern diagram of a color filter of Example 3. Applicant Suwa Seikosha Co., Ltd. 1 ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑ ↑

Claims (2)

[Claims] (1) In a liquid crystal color display device formed by pixels of a liquid crystal shutter arranged in a matrix and three color filters of red, green, and evening arranged correspondingly, the amount of light is controlled by the liquid crystal shutter. A liquid crystal color display device characterized in that several pixels or more of pixels consisting only of color filters are formed around a pixel region to be controlled. (2) A liquid crystal color display device characterized in that a pixel area in which the amount of light is controlled by a liquid crystal shutter is surrounded by a plurality of pixels or more, each of which has only a color filter of one specific color.