KR20040061947A - High brightness liquid crystal display - Google Patents

Abstract

PURPOSE: A high-brightness LCD element is provided to disperse light sources in a certain disperse degree by adding a disperse plate, and to insert a PDLC(Polymer Disperse LCD) element to add a horizontal electrode to the PDLC element, so that a user controls an optimal appearance according to an angle of observation of the user. CONSTITUTION: An LCD panel(1a) is configured in predetermined size. A disperse plate(1c) mounts lamps(1d) thereon by covering the lamps(1d) for emitting light sources, and disperses the light sources emitted from the lamps(1d). A PDLC panel(1b) is inserted between the LCD panel(1a) and the disperse plate(1c). The inserted PDLC panel(1b) controls a dispersion amount of light according to a driving voltage with a certain gradation.

Description

High brightness liquid crystal display device {HIGH BRIGHTNESS LIQUID CRYSTAL DISPLAY}

The present invention uses a plurality of lamps in combination with a diffuser plate under an LCD panel for high brightness specification in thin film transistor-liquid crystal display (hereinafter referred to as TFT-LCD) or other LCD products. In order to actively improve the observer's visual problem caused by the direct type backlight, a polymer diffusion type liquid crystal display (PDLC) that can adjust the clouding state is used in combination with a diffusion plate. It is the invention which made appearance improvement possible.

Up to now, the direct method mainly used in manufacturing a high-brightness backlight has been a specification that greatly increases the amount of light to the LCD by using a plurality of lamps for the backlight. According to the position of the lamp in this specification, there is a difference in the luminance of the area where the lamp emits light and the area where the lamp does not emit light, which appears as a luminance stain. Conventionally, in order to improve such luminance unevenness, a diffuser or printing using a shielding ink is applied on a diffuser plate or an injection molding is used to add a three-dimensional shape having a groove structure to solve the occurrence of luminance unevenness. .

However, in this method, when the luminance spot is improved, the observer may not detect the luminance spot in the front or narrow angle, but there is a problem in that the luminance spot may be felt when the observation angle becomes larger than the predetermined angle.

In addition, this limitation of viewing angle is acting as a barrier to TV response of TFT-LCD.

In LCD for TV and multimedia, high-brightness specification is essential, but the viewing angle is limited due to the above problems, which makes it difficult to apply to actual products.

In order to solve the above problems, in the present invention, a diffuser plate is basically added to diffuse the light source with a certain diffusion, and a polymer diffusion liquid crystal display device for appearance improvement, which is not printing or irregularities, is inserted. By adding a horizontal electrode to the device, the viewer can arbitrarily adjust the diffusion for improving the appearance and change the diffusion position so that the user can adjust the optimal appearance according to his / her own viewing angle at his or her will, and more actively. It is an object of the present invention to provide a high brightness liquid crystal display device capable of improving the appearance.

1 is a conceptual diagram illustrating a structure in which a PDLC panel is inserted between an LCD panel and a diffusion plate to improve active appearance quality proposed by the present invention.

2A and 2B are conceptual views of a structure in which diffusion or shielding printing is applied on a diffusion plate and a structure in which a three-dimensional structure is added in order to reduce luminance deviations of a lighting part and a non-lighting part of a lamp in a conventional method.

Figure 3 is a PDLC panel inserted between the LCD panel and the diffuser plate for use in the improvement of active appearance quality in the present invention by adding a drive pattern in the longitudinal direction of the lamp to show the transmission and turbidity in the selected region and non-selected region, respectively Conceptual diagram showing how to adjust.

4 shows a good appearance quality when the observer's viewing angle is the front when the printed diffusion plate is used to shield the lamp in the conventional method, but the appearance quality deteriorates when the viewing angle is constant. Conceptual diagram showing how to do this.

5 is different from FIG. 4 when the present invention is applied, the appearance is improved to a specific region by the PDLC panel when the front face according to the observer's eyes, and when the observation angle is the front face, the appearance is actively adjusted by adjusting the compensation position. A conceptual diagram of the present invention showing improvement.

[Description of Drawing Reference]

1a: LCD panel 1b: PDLC panel

1c: diffuser plate 1d: lamp

3a: selection area 3b: non-selection area

The high brightness liquid crystal display device according to the present invention for achieving the above object, in the liquid crystal display device for the improvement of the active appearance quality by the PDLC panel adopted in the direct method, the LCD panel of a predetermined size, the light source of a predetermined luminous intensity It is characterized in that the lamp is wrapped inside the mounting, the diffusion plate for diffusing the light source emitted from the lamp, and the PDLC panel is inserted between the LCD panel and the diffusion plate positioned.

Preferably, the PDLC panel may select the state of cloudiness and transmission in the longitudinal direction of the lamp by the selected region and the non-selected region to which the driving pattern is added in the longitudinal direction of the lamp, and move randomly in the direction of improving the appearance. Characterized in that it can be driven.

In addition, the inserted PDLC panel is characterized in that the light diffusion can be controlled according to the driving voltage with a constant gradation in the cloudy and transparent state.

The high brightness liquid crystal display device according to another aspect of the present invention is a liquid crystal display device for improving the appearance of the active appearance by the LCD panel, the LCD panel of a predetermined size, a lamp for emitting a light source of a predetermined brightness is wrapped therein mounted And a diffuser plate for diffusing a light source emitted from the lamp, and a motion sensor for detecting a motion of an observer, and the LCD panel automatically appears according to an observation angle according to a detection signal of the motion sensor. Characterized by performing an improvement.

The motion sensor may be mounted at a predetermined position of the liquid crystal display device. In addition, the high brightness liquid crystal display device is driven through a power supply of a power supply unit under the control of a controller (not shown).

A high brightness liquid crystal display device according to another embodiment of the present invention is a liquid crystal display device for improving the appearance of the active appearance by the LCD panel, the LCD panel of a predetermined size, and a lamp for emitting a light source of a predetermined brightness is wrapped therein And a diffuser plate for diffusing a light source emitted from the lamp, wherein the diffuser plate is formed by the selected region and the non-selected region to which the driving pattern is added in the longitudinal direction of the lamp. The state can be selected, and can be arbitrarily moved and driven in the direction of appearance improvement.

(Example)

Hereinafter, a high brightness liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention is directed to the PDLC (polymer disperse LCD), which is not a conventional printing method or uneven part method in appearance problems caused by the lighting of the lamp portion in the direct-type backlight used in high-brightness LCD panels for TV and multimedia. The invention relates to a method for actively improving using

The direct type backlight, which is mainly used in LCD panels with high brightness, has the advantage that high brightness can be obtained by arranging a plurality of lamps because the lamp is located directly under the panel, unlike the backlight of a general side light source type. On the other hand, since the viewer perceives it as a bright line or a dark part on the panel by the difference in luminance between the part where the lamp is located and the part where the lamp is not, the display appearance quality deteriorates.

Generally, in order to solve this problem, a diffuser plate having a high Haze value is inserted at a constant thickness between the lamp and the LCD panel to diffuse light emitted from the lamp, thereby causing a difference in luminance between the light emitting part and the non-light emitting part of the lamp. Is improving. However, as the demand for thinner devices increases rapidly and the distance between the lamp and the diffuser becomes narrower, the desired appearance quality cannot be obtained only by the diffusivity of the diffuser plate. The diffusion plate itself is used to improve the appearance quality by adding unevenness around the part matching the lamp and changing the diffusion or shielding degree locally.

However, in this method, when the appearance quality is improved, the standard of appearance is used as the front standard. Therefore, when the observer is located on the upper and lower sides instead of the front and looks at the screen with a certain angle, the light emitting part and the non-emission of the lamp An area where the area is not compensated by the observer's viewing angle occurs, resulting in a marked deterioration in display appearance.

This problem can never be solved by the conventional method, and therefore, in the present invention, the observer actively adjusts the display appearance quality, or detects the position of the observer by the motion sensor to improve the appearance quality. Is added between the existing diffuser plate and LCD panel.

PDLC panels show transparent and white scattering states for the selected and non-selected areas, respectively, and have the advantage that they can be introduced into existing LCD panels without adding a large cost because the manufacturing technique or method is simple. .

The present invention has a structure in which a PDLC panel having an electrode pattern is inserted between an LCD panel and a diffuser plate having a constant diffusivity in the same direction as the direction of light emission of a lamp horizontally or vertically. Therefore, the clouding state, which plays a role of light diffusion, can be moved in the longitudinal direction of the lamp, thereby actively responding to changes in the observation angle of the observer, which cannot be solved in the fixed diffusion or shielding pattern as in the conventional method.

That is, when the observer's viewing angle is lowered 40 degrees downward from the front, the direct-type LCD panel manufactured by the conventional method has no way of correcting this, so the observer feels a different appearance quality than when the front viewing is performed. Increases the visual fatigue of the observer. However, in the present invention, when the observer's vision is changed to 40 degrees downward in the present invention, the diffusion pattern in the cloudy state can be shifted to the same downward 40 degrees in the PDLC panel. Since it can be adjusted, the observer can observe the display information in the same display quality as in the front view, so there is little visual fatigue. Therefore, the improvement of the appearance quality in the present invention can be referred to as active appearance improvement, and is an invention superior to existing products in terms of ergonomics of user response.

As shown in Fig. 1, the PDLC panel 1b is inserted between the LCD panel 1a and the diffusion plate 1c. Reference numeral 1d denotes a lamp.

In addition, as shown in FIG. 2, in the conventional method, a structure in which diffusion or shielding printing is applied or diffused or shielded printing is applied on the diffusion plate 1c to reduce the luminance deviation of the lighting portion and the non-lighting portion of the lamp. There is.

In addition, as shown in FIG. 3, in the present invention, in the PDLC panel 1b inserted between the LCD panel and the diffuser plate for use in improving the appearance of active appearance, a driving pattern is added in the longitudinal direction of the lamp. A method of controlling the transmission and turbidity states in 3a) and the non-selected region 3b, respectively, is shown.

In addition, as shown in Fig. 4, when the diffuser plate 1c printed to shield the lamp 1d is used in the conventional method, a good appearance quality is secured when the observer's viewing angle is the front position 4a. It can be, but the position 4b has a deterioration of the appearance quality when it has a certain observation angle.

In addition, as shown in FIG. 5, in the case where the present invention is applied, unlike in FIG. 4, the front face 4a is moved to the region 5a by a PDLC cell formed in the diffusion plate 1c in the front position 4a. The appearance quality is improved, and when the viewing angle is front, the position 4b adjusts the compensation position to the region 5b to actively improve the appearance. That is, in this embodiment, the PDLC cell is directly formed on the diffusion plate without inserting a separate PDLC panel as shown in FIG. 3.

The present invention is an invention that can actively improve the appearance quality with respect to the change in the viewing angle of the observer by controlling the cloudy and transparent state in the longitudinal direction of the LCD panel using an easy-to-manufacture and inexpensive PDLC panel as a TV or multimedia Reduction of the appearance quality and the increase of visual fatigue due to the observation angle which is a problem in the direct backlight type used in high-brightness LCD panels for use can be fundamentally improved rather than improved by unsolving measures such as printing or uneven structure. There is this. Among the requirements of information display devices, the next demand for LCD panels, which are thin and lightweight, can meet the requirements. For TV and multimedia applications, observers are unlikely to form observation angles at arbitrary angles, unlike monitors or notebook PCs. Therefore, there is an urgent need for improvement in appearance. Accordingly, the present invention is very effective in improving the appearance of high-value-added TVs and LCD panels for multimedia.

Claims (5)

In the liquid crystal display device for the improvement of the active appearance quality by the PDLC panel adopted in the direct method, Predetermined size LCD panel, A diffuser plate for enclosing a lamp for emitting a light source having a predetermined brightness and diffusing the light source emitted from the lamp, and And a PDLC panel positioned between the LCD panel and the diffusion plate. According to claim 1, wherein the PDLC panel is selected in the longitudinal direction of the lamp by the selection region and the non-selection region in which the driving pattern is added in the longitudinal direction of the lamp, respectively, the state of the haze and transmission can be selected in the direction of improving the appearance A high brightness liquid crystal display device, characterized in that it can be moved to drive. The high brightness liquid crystal display device according to claim 1, wherein the inserted PDLC panel has a constant gradation in a cloudy and transparent state and the amount of light diffusion can be controlled according to a driving voltage. In the liquid crystal display device for the improvement of the active appearance quality by the LCD panel, Predetermined size LCD panel, A diffuser plate for enclosing a lamp for emitting a light source having a predetermined brightness and diffusing the light source emitted from the lamp, and It consists of a motion sensor that detects the observer's motion, And the LCD panel automatically improves the appearance according to the observation angle according to the detection signal of the motion sensor. In the liquid crystal display device for the improvement of the active appearance quality by the LCD panel, A predetermined size LCD panel, and A lamp for emitting a light source of a predetermined intensity is wrapped and mounted therein, consisting of a diffusion plate for diffusing the light source emitted from the lamp, The diffusion plate may select a state of cloudiness and transmission in the longitudinal direction of the lamp by the selected region and the non-selected region to which the driving pattern is added in the longitudinal direction of the lamp, and may be driven to move arbitrarily in the direction of appearance improvement. A high brightness liquid crystal display element characterized by the above-mentioned.