JPS5994735A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To realize cost reduction and high gradation precision by detecting and compensating the optical variation among plural liquid crystal elements roughly by a sensor and compensating the variation of each liquid crystal element by estimated data. CONSTITUTION:The optical variation among the respective liquid crystal elements 1 is detected by a sensor 8 and a compensating device 7 outputs compensating data corresponding to the variation. A memory 9 outputs gradation data and a memory 11 outputs compensating data set previously for compensating the variation among the liquid crystal elements 1. A gradation generator 6 inputs those outputs and the gradation data from the memory 9 is compensated by the compensating data from the compensating device 7 and memory 11, so that the gradation generator 6 generates a gradation voltage on the basis of the compensated gradation data. Thus, the cost reduction and high gradation precision are realized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a four-current circuit system forming a composite matrix structure with nonlinear elements and a nematic liquid crystal layer provided between these systems, and a nematic liquid crystal layer at the intersection of the rows and columns of the matrix. A liquid crystal display device in which the layers are driven by a time-division driving method, in which the voltage applied to the liquid crystal layer is controlled by optical variations and preset variations between liquid crystal elements. It is related to.

Conventionally, this type of device consists of a composite matrix composed of liquid crystal elements and nonlinear elements as shown in FIG. 1, and the liquid crystal elements at the intersections of this composite matrix are driven by a drive device as shown in FIG. There was something I did.

That is, in FIG. 1, 1 is each nematic liquid crystal element constituting the matrix 12, 2 is a nonlinear element, and 3 is a hold capacitor. In FIG. 2, 4 is a nonlinear matrix composed of a nonlinear element 2 and a hold capacitor 3, 5 is a decoder that selects the X row of the nonlinear matrix 4, and 6 is a gradation that applies voltage to the Y column. A generator, 7 a compensator for correcting optical variations in the liquid crystal element 1, 8 a sensor for detecting optical variations in the liquid crystal element 1, 9 a memory for storing gradation data, and 10 for generating each drive timing. It is a controller.

Next, the operation of the above conventional device will be explained.

First, the gradation data stored in the memory 9 is corrected in the gradation generator 6 using Pacschki correction data output from the compensator 7 based on the optical variation of the liquid crystal element 1 detected by the sensor 8. A grayscale voltage is generated based on the Ω-corrected grayscale data. Next, a grayscale voltage is applied to the X row selected by the decoder 5 and the Y column by the grayscale generator 6, and a nonlinear element 2 such as a FET at the intersection is applied.
etc. are turned on, and the hold capacitor 3 holds the voltage until the nonlinear element 2 is turned on again.
is driven by a voltage held by. The controller 10 generates timing signals necessary for each part.

However, in the conventional device described above, only one sensor 8 for detecting optical variations in the liquid crystal element 1 is provided for a plurality of liquid crystal elements l, so compensation for this variation is performed for a plurality of picture elements. However, in order to compensate for the optical pan-skip of each liquid crystal element 1, it is necessary to provide a sensor 8 for each liquid crystal element 1, which has the disadvantage of being expensive.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and uses a senna to roughly detect and compensate for optical variations in a plurality of liquid crystal elements. By correcting the variation using preset prediction data, it is possible to correct the optical variation of each liquid crystal element without detecting the optical variation of each liquid crystal element, which is inexpensive and has high gradation accuracy. The purpose is to provide a high quality liquid crystal display device.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 3, 11 is a memory that stores compensation data based on preset optical variations between each liquid crystal element 1;
The other configurations are the same as in FIG. 2.

Next, the operation of the above device will be explained. Optical variations between each liquid crystal element 1 are detected by a sensor 8, and a compensator 7 outputs compensation data according to this variation. Further, the memory 9 outputs the instruction data, and the memory 11 outputs each liquid crystal element 1.
Outputs preset compensation data that compensates for variations between the two. In the gradation generator 6 which receives these outputs, the gradation data from the memory 9 is corrected by the correction data from the compensator 7 and the memory 11, and the gradation generator 6 receives the corrected gradation data. Generates gray scale voltage based on. In the nonlinear matrix 4, a grayscale voltage is applied to the X row selected by the decoder 5, and a grayscale voltage from the grayscale generator 6 is applied to the Y column, and the nonlinear element 2 at the intersection is turned on. Meanwhile, the hold capacitor 3 connected to this holds the voltage until the nonlinear element 2 is turned on again, and the liquid crystal element 1 connected thereto is driven by the holding voltage of the hold capacitor 3. In this case as well, the controller 10 generates timing signals necessary for each part.

Note that if the voltage can be held only by the liquid crystal element 1, the hold capacitor 3 can be omitted.

As described above, in the present invention, optical variations in a plurality of liquid crystal elements are roughly detected and compensated for using a sensor, and variations in individual liquid crystal elements are compensated for using preset prediction data. In this way, optical variations can be compensated for favorably without having to individually detect optical variations in each liquid crystal element. Therefore, it is not necessary to provide each of the above-mentioned sensors near the liquid crystal element, making it possible to reduce the cost of the device and improve gradation accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a composite matrix in a conventional device, FIG. 2 is a block diagram of the conventional device, and FIG. 3 is a block diagram of the device of the present invention. DESCRIPTION OF SYMBOLS 1...Liquid crystal element, 2...Nonlinear element, 3...Hold capacitor, 4...Nonlinear matrix, 5...
・Decoder, 6... Gradation generator, 7... Compensator, 8
...Sensor, 9...IV tone data memory, 10...
- Controller, 11... Variation correction data memory, 12... - Matrix. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (1)

[Claims] (1) In a liquid crystal display device that has a conductive path system that forms a composite matrix structure of liquid crystal elements and nonlinear elements, there are optical variations between each liquid crystal element actually detected by a sensor, and optical variations that are predicted and set in advance. A liquid crystal display device characterized in that gradation data is corrected based on optical variations between liquid crystal elements, and each liquid crystal element is driven by time division driving based on the corrected gradation data. .