Display device and driving method thereof, and display pattern evaluation for sub-element of picture

Abstract

An active matrix liquid crystal display device has a plurality of unit pixels being arranged in a matrix configuration, each unit pixel being divided into a plurality of subpixels. Each of the subpixels has a subpixel electrode, a pixel transistor connected to the subpixel electrode, and a voltage controlling capacitor connected to the subpixel electrode. A voltage controlling capacitor line for supplying a compensation voltage signal is connected to the voltage controlling capacitor so that after the writing to the subpixel has been completed, the potential of the compensation voltage signal is varied to modulate the potential of the subpixel electrode to be a predetermined voltage. Such method eliminates the need for digital-to-analog converter circuits, attains gray scale display based on a digital image signal, and achieves a reduction in power consumption.

Description

technical field [0001] The present invention relates to a liquid crystal display device suitable for so-called portable devices and the like, an electroluminescent display device and a driving method thereof, and relates in detail to a liquid crystal display device, an electroluminescent display device and Its driving method and the display pattern evaluation method of the sub-pixel. Background technique [0002] Figure 39 It is a circuit configuration diagram of a pixel of an active matrix liquid crystal display panel (hereinafter referred to as a first prior art example). exist Figure 39 Among them, SL is a signal line, GL is a scanning line, Tr is a pixel transistor, C is a storage capacitor, 155 is a pixel electrode, and 156 is a storage capacitor line. With such a configuration, when the gradation display method of the input image display signal for displaying an image is an analog signal, sufficient display can be performed. However, the image data in recent portab...

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Problems solved by technology

[0008] (4) Also, in the second prior art example, the pixel electrodes 155a, 155b, 155c, and 155d are driven by the pixel transistors Tr1, Tr2, Tr3, and Tr4 to perform gray scale display. The grayscale display of the pixel and the grayscale display of the adjacent unit pixel are combined to display a band-shaped shade on the display screen, and a fixed pattern (fixed pattern) can be seen, and the image quality of the LCD panel becomes low.

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