KR20010079129A - Large area flat panel display using prism lens sheet - Google Patents

Abstract

PURPOSE: A large-scaled flat display device using a prism lens sheet is provided to compensate a defect of an external appearance and cover a junction portion by using a prism sheet. CONSTITUTION: Two prisms are used for compensating a defect of an external appearance generated when connecting a plurality of LCDs to each other. A longitudinal direction prim and a lateral direction prism are used for compensating a defect of an external appearance when a plurality of LCDs is connected to each other. A local defect of external appearance is overcome by using a prism sheet. A method using the prism sheet is used for improve display luminance though it is dependent on an observation angle. A triangle prism sheet is used for preventing deterioration of display quality for a junction portion and a connection portion.

Description

Large area flat panel display using prism lens sheet

The present invention relates to a large-screen flat panel display device, specifically, to realize a high-quality display to the observer by using a prism lens sheet to reduce the display defects at the connection part to realize a single screen using a plurality of LCD and other flat panel display elements. It is a method for supplying image quality.

PDP (Plasma Display Panel), which is currently attempting to be distributed to the general public as a flat panel display device, is still very expensive compared to its size, which is a price formed by difficulty in manufacturing process or limitation of demand. In addition, the LCD device, which is currently in the spotlight as the next generation display device, is also difficult to apply to a large size for home use or advertisement due to a problem of price. In fact, the current size of LCD production for the use of moving picture display that can realize color is a practical limit of 21 inches because it is difficult to produce a larger size display without significant improvement of related technology. . In particular, the TFT (Thin Film Transistor) LCD adopted to satisfy high quality display quality is practical in size that can be realized by securing TFT manufacturing yield and time processing of signal processing due to the increase in the number of pixels on a large screen. It is at the present level of technology that constraints exist. Recently, the market trend is increasing the demand for high-end products, and considering the consumption tendency, the demand for the large-screen thin display device will continue to increase. However, there is no suitable large-screen flat panel display that can meet the demands of the market at present, which may be attributed to the high price according to the current technology level.

In order to realize the large-screen flat panel display, the realistically conceivable method is implemented by the projection type LCD and the CRT screen, but it is expected that the display quality will be remarkably reduced due to the expansion of the size, and it will be difficult to cope with the next-generation large-screen display. .

In accordance with this trend, the present invention uses a plurality of LCD sized notebook PCs, which are expected to have a sharp drop in the sales volume in accordance with the current production volume, in order to implement a lower priced high quality large screen flat panel display. The present invention proposes a method by using a prism sheet as a method for reducing display defects occurring between LCD and LCD.

The prism sheet that satisfies the specifications presented in the present invention is already produced by domestic and foreign companies, it is expected to be easy to arrange the raw materials, low cost and to satisfy the object of the present invention. In the present invention, the maximum separation distance of the LCD in the case of using a conventional prism sheet for compensating the non-display area is presented through experiments, and a method of realizing one large screen by configuring a plurality of LCDs under these conditions is presented.

In the present invention, a method of compensating for appearance defects by using a prism sheet is presented. In this case, a specification in which the joint is not revealed by the viewer's eyes is presented through experiments.

In addition, to minimize the defects in appearance, the adjustment of the set luminance value of the connection part and the specific method for obtaining the luminance value are also presented.

Indeed, the luminance deterioration in the non-display area of the connection part appears as an appearance defect, which becomes a state that can be confirmed by the viewer's eyes, making it difficult to construct a large screen display using a plurality of LCDs. In the present invention, the luminance characteristics of the connection part are accurately measured by using the optical measuring system shown in Fig. 2, and then the luminance value of the part is quantitatively increased so that the viewer cannot detect such a visual defect. LCD presents a practical way to implement one large display.

1 is a basic structural diagram of a method of using a prism sheet 1c for bonding and using liquid crystal panels 1a and 1b as a basic principle of the present invention.

Fig. 2 is a schematic diagram of an optical measuring system for obtaining a quantitative luminance request value including a luminance meter 2a and a connected liquid crystal panel 2b, 2c and a prism sheet 2d placed thereon;

3 is a basic conceptual view showing the principle that the non-light emitting region 3d at the junction with the liquid crystal panels 3a and 3b used in plurality is transferred to the observer 3e by the prism sheet 3c.

4 is a conceptual diagram of display distortion occurring when a prism sheet is used, and a display distortion occurring at 4c, 4d, and 4e through the prism sheet 4b for a fixed image 4a.

5 is a conceptual diagram of compensating for the non-emission region of the plurality of liquid crystal panels 5a and 5b using the prism sheet 5c and then reducing the visual dependence through the lenticular lens 5d and extending the effective observation angle.

In order to compensate for the horizontal and vertical appearance defects occurring when connecting a plurality of LCDs, the present invention uses two horizontal and vertical prisms, and the composition of the sheet is not limited to the resolution of the screen. It is also possible to stretch in pairs. However, due to the characteristics of the prism sheet, there is a difference in the display quality delivered according to the direction of the observer, so it is important to configure the proper level in consideration of this. The principle of the present invention is based on the uniformity of the pitch determined by the prism sheet and the display quality within the pitch as shown in Figs. Indeed, the use of such a prism sheet has been proved to have many effects in the defects of local appearance, and depending on the viewing angle, it can also be used as a method of increasing the display brightness.

As a result of the measurement of the luminance with respect to the separation distance that cannot be detected by the naked eye, it was found that it is necessary to approach the panels at intervals of 5 mm or less vertically and horizontally. It is generally thought that the technique to make it possible to implement.

In FIG. 4, the distortion of the display image which arises when a triangular prism sheet is used is demonstrated. As shown in the figure, in the case of using a prism sheet having a triangular cross-sectional shape with a constant pitch, the dependence of the observation angle determined by the left and right, ie, symmetrical slopes, is generated based on the center line of the prism. Therefore, the present invention proposes a method of reducing such visual dependence and enlarging the effective viewing area by using a lenticular lens as shown in FIG. 5 as a method of substantially reducing such defects. It has been shown that the use of lenticular lenses solves the visual dependence and effective viewing area that cannot be solved in triangular prisms.

That is, a triangular prism sheet was used to prevent display quality deterioration on the bonding and connecting areas.In this case, the decrease in quantitatively measured luminance was compensated for through the design of the backlight, and the enlarged effective observation area of the obtained camera was obtained. In order to reduce the visual dependence, a lenticular lens is used.

The present invention provides the use of a triangular prism sheet and visual dependence and re-emergence through the use of a triangular prism sheet to realize a low cost, high quality image implemented by a tiling arrangement of a plurality of display elements, in particular, an LCD for a large display, without appearance defects. The use of lenticular lenses to solve the narrowing of the observation area is proposed. As the related technologies used in the present invention have already proved that there is no problem in academic and practical reproducibility and mass production, it is possible to realize a low-cost, high-quality large-screen display that can be actually implemented only by researching the application surface. Can be utilized as one method that can adequately respond to the demands of the large-screen flat panel display is increasing.

Claims (2)

Adoption of the triangular prism lens sheet used to make a single screen by tiling a plurality of LCDs, a design value for implementing the same, and a presentation of a quantitative backlight brightness request value capable of compensating for the degradation of the brightness, and Compensation method based on measured value of separation distance Adoption of lenticular lenses to narrow the effective field of view and reduce visual dependence when using only triangular prism lenses