JPS60126623A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To drop an optical threshold voltage of a liquid crystal, and to make a displace luminance uniform in case of a large-sized matrix display, etc., by thinning a thickness of a liquid crystal layer of a liquid crystal display panel, in a place where a voltage is attenuated, in the direction in which an electrode group having a longer electrode length is extended. CONSTITUTION:In case when a large-sized display is executed by a liquid crystal display panel having a matrix type electrode structure, where an electrode 3 on a substrate 1 of the opposed surface of the substrate 1, 2 is extended longer than an electrode 3 on the substrate 2, a transmitting end 4 is placed at thicker end of a wedge shape, and as for the opposite side end in which a voltage is attenuated, the liquid crystal layer is thinned. In this way, in case of a thin liquid crystal layer, an optical threshold voltage of a liquid crystal is made small so that a picture element can be lighted even by an attenuated voltage, and a display luminance which is uniform extending over the whole surface can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display panel having a matrix electrode structure.

Conventional Structures and Their Problems In recent years, liquid crystal display panels have tended to have larger panel areas as the amount of display has increased. A matrix type liquid crystal display panel generally has a configuration as shown in Figure 1.
Of a pair of substrates, one has a group of X electrodes aligned in the X direction, and the other has a group of Y electrodes aligned in the Y direction, and a liquid crystal of a certain thickness is interposed between the substrates. , its operation is to sequentially select one electrode group one by one, and in synchronization with this, selectively apply voltage to the electrodes of the other electrode group that are connected to the picture elements to be lit. It is carried out.

By the way, since the electrode has a finite resistance value, the voltage applied to the transmitting end drops and attenuates as the distance from the transmitting end increases. As mentioned above, increasing the size of the panel, that is, increasing the electrode length, increases the voltage attenuation due to the ζ electrode resistance. In other words, this means that
This causes a problem in that a sufficient voltage is no longer applied to the picture element, and the display brightness of the picture element in the lit state becomes uneven. One possible solution to this problem is to reduce the electrode resistance, but there are drawbacks to this in terms of manufacturing process and cost.

OBJECTS OF THE INVENTION An object of the present invention is to provide a liquid crystal display panel that provides uniform display brightness.

Structure of the Invention The liquid crystal display panel of the present invention has a group of electrodes aligned in one direction formed on one of opposing surfaces of a pair of substrates, and electrodes aligned in a direction perpendicular to the aforementioned direction formed on the other surface. A liquid crystal layer is formed between the substrates, and the thickness of the liquid crystal layer is changed depending on the location. Incidentally, when the thickness of the liquid crystal layer is reduced, the optical threshold voltage of the liquid crystal becomes lower. Although voltage attenuation due to electrode resistance increases as the distance from the transmitting end increases, it is possible to configure the panel as described above to reduce the thickness of the liquid crystal layer and lower the optical threshold voltage of the liquid crystal. This makes it possible to light up picture elements even with attenuated voltage, thereby realizing display with uniform brightness.

DESCRIPTION OF THE EMBODIMENT FIG. 2 shows an embodiment of the present invention. The pair of substrates 1 and 2 are arranged so as to form a wedge shape as a whole, and the direction in which the longer electrode group of the electrodes 3 extends is aligned with the direction of inclination of the wedge shape. be. The transmitting end 4 is at the thicker end of the wedge shape. The voltage applied to the transmitting end 4 attenuates due to the influence of the electrode resistance, but since the thickness of the liquid crystal has become smaller, the optical threshold voltage has become lower, and it takes longer for the picture element to light up. This corresponds to a sufficient voltage being applied. Therefore, display with uniform brightness can be obtained.

Effects of the Invention In the liquid crystal display panel of the present invention, the thickness of the liquid crystal layer is distributed in a linear decreasing function as a function of the distance from the transmitting end in the direction in which the electrode group with the longer electrode length extends. etc., we were able to lower the optical threshold voltage of the liquid crystal in areas where the voltage was attenuated, and turn the picture element into a lit state. This achieves uniform display brightness.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an electrode pattern of a conventional liquid crystal display panel, and FIG. 2 is a perspective view showing the structure of a liquid crystal display panel according to an embodiment of the present invention. 1.2...Substrate, 3...Electrode.

Claims (1)

[Claims] A group of electrodes aligned in one direction is formed on one of the opposing surfaces of a pair of substrates, a group of electrodes aligned in a direction perpendicular to the direction is formed on the other surface, and a liquid crystal layer is formed between the substrates. What is claimed is: 1. A liquid crystal display panel comprising: a liquid crystal display panel characterized in that the thickness of the liquid crystal layer is changed depending on the location.