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Semiconductor display device and driving method

A display device, semiconductor technology, used in static indicators, cathode ray tube indicators, instruments, etc., can solve problems such as image quality degradation

Inactive Publication Date: 2005-11-23
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by performing image processing such as dithering, a large total grayscale level can be displayed, and the displayed image appears to be sprinkled with sand, inevitably resulting in image degradation

Method used

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  • Semiconductor display device and driving method
  • Semiconductor display device and driving method
  • Semiconductor display device and driving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Next, use Figures 6A to 6C A circuit diagram depicting a pixel in a light emitting device of the present invention.

[0113] Figure 6A is an example of an equivalent circuit diagram of a pixel, which includes a signal line 6114 , a power supply line 6115 , a scanning line 6116 , a light emitting element 6113 , TFTs 6110 and 6111 , and a capacitor 6112 . A video signal is input to the signal line 6114 through the signal line driver circuit. The TFT 6110 can control supply of a video signal potential to the gate of the TFT 6111 in accordance with a selection signal input to the scanning line 6116 . The TFT 6111 can control the supply of current to the light emitting element 6113 according to the potential of the video signal. The capacitor 6112 can hold the gate-source voltage of the TFT 6111. It should be noted that Figure 6A However, the capacitor 6112 may not be provided if the gate capacitance of the TFT 6111 or other parasitic capacitance is sufficient to mai...

Embodiment 2

[0118] In this example, in Figure 4 The timing at which each subframe period occurs is described in the case of the described driving method.

[0119] Figure 7 is to use Figure 4 Timing diagram for the case of a 4-bit gray scale display for the driving method shown. exist Figure 7 , the horizontal axis represents the subframe period SF in a frame period 1 to SF 9 The length of , the vertical axis shows the selection order of the scan lines. from SF 1 Start the subframe period SF 1 to SF 9 The sequence of length ratios is set to 1:1:1:1:1:2:2:3:3.

[0120] When each subframe period starts, each pixel of one row sharing the scan line performs video signal input. After a video signal is input to a pixel, the light emitting element emits or does not emit light according to data of the video signal. The light emitting element in each pixel keeps emitting light or not emitting light according to the data of the video signal until the start of the next sub-frame period...

Embodiment 3

[0124] In this example, using Figures 8A to 8C A cross-sectional structure of a pixel in which a transistor for controlling current supply to a light-emitting element is of a P-channel type is described. Note that, in this specification, one of the anode and cathode of the light-emitting element whose potential can be controlled by a transistor is called a first electrode, and the other is called a second electrode. exist Figures 8A to 8C The description will be made in the case where the first electrode is an anode and the second electrode is a cathode. However, it is also possible that the first electrode is a cathode and the second electrode is an anode.

[0125] Figure 8A is a cross-sectional view of a pixel in a case where the transistor 6001 is a P-channel type and light emitted from the light emitting element 6003 is extracted from the first electrode 6004 side. The first electrode 6004 of the light emitting element 6003 is electrically connected to Figure 8A T...

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PUM

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Abstract

The invention provides a semiconductor display device with less generation of a pseudo contour while the drive frequency of a driver circuit is suppressed. Furthermore, the invention provides a semiconductor display device with less generation of a pseudo contour while the decrease in image quality is suppressed. A semiconductor display device comprises a table storing data for determining a relationship between the gray scale level of a video signal and a subframe period for light emission in the plurality of subframe periods, a controller for changing a video signal in accordance with the data and outputting, and a panel whose pixel gray scale level is controlled in accordance with the outputted video signal. The number and the length of the plural subframe periods for each gray scale level of 2 or more are determined in accordance with a subframe ratio Rwhich is calculated in accordance with a sharing ratio Rdetermined by the frame frequency.

Description

technical field [0001] The invention relates to a semiconductor display device displayed by a time gray scale method and a driving method thereof. Background technique [0002] As a driving method of a light emitting device which is one of semiconductor display devices, there is known a time grayscale method in which a binary voltage of a digital video signal is used to control the light emitting period of pixels in one frame period to display grayscale. Since the reaction speed of the electroluminescent material is generally faster, it is more suitable for the time gray scale method than liquid crystal or the like. In particular, when displaying by time grayscale, one frame period is divided into a plurality of subframe periods. Next, the pixels determine whether to emit light or not to emit light according to the video signal in each sub-frame period. According to the above structure, the total actual lighting period of pixels in one frame period can be controlled by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/30
Inventor 宫川惠介
Owner SEMICON ENERGY LAB CO LTD