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Semiconductor device and driving method thereof

A display device and circuit technology, applied to static indicators, instruments, etc., can solve the problems of increased analog data voltage range, increased cost, and increased withstand voltage of data drive units, so as to increase the maximum brightness and suppress power consumption. Effect

Inactive Publication Date: 2011-01-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to problems that the magnitude of the analog data voltage increases and the power consumption of a block for outputting the analog data voltage, especially in the voltage output amplifier unit increases
Also, if the magnitude of the analog data voltage increases, the withstand voltage of the data driving unit needs to be increased, thereby requiring a high voltage process, which leads to an increase in cost

Method used

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  • Semiconductor device and driving method thereof
  • Semiconductor device and driving method thereof
  • Semiconductor device and driving method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 2 An example of a pixel circuit 2 used in a display device including an organic EL element according to the present invention is shown. use the same reference numerals to indicate figure 1 The parts in the same part.

[0028] The pixel circuit 2 includes an organic EL element EL, a current supply circuit unit 21 that supplies a current corresponding to a grayscale display signal to the organic EL element EL, and control lines 5 to 7 that transmit control signals P1 to P3 to the current supply circuit unit 21 . The pixel circuit 2 further includes a data line 8 and a reference voltage line 9 respectively transmitting a data voltage and a reference voltage, and a power supply line Vcc.

[0029] The current supply circuit unit 21 includes a driving transistor TR for generating a current corresponding to a grayscale display signal and a capacitor C for holding the grayscale display signal and transmitting the grayscale display signal to the gate of the driving tra...

Embodiment 2

[0063] Figure 5 Another example of a pixel circuit 2 of a display device according to the present invention is shown, wherein figure 2 The reference voltage line 9 and the data line 8 in the pixel circuit 2 are combined into a line 8 . The capacitor C is connected between the gate of the driving transistor TR and the data line 8 . exist Figure 5 In the circuit, the control signal P1 and the switches SW2 and SW3 are not set. In this case, the capacitor terminal voltage setting circuit 23 includes a connection line for connecting the capacitor C and the data line 8, the data line 8, and a circuit for supplying the data voltage and the reference voltage to the data line 8 ( figure 1 The column control circuit 4).

[0064] In this embodiment, although PMOS is used as the driving transistor, NMOS may also be used. use the same reference numerals as figure 2 The elements in the pixel circuit 2 have the same functions as the other elements.

[0065] There are two control l...

Embodiment 3

[0075] allowable figure 1 A display amount detection unit suitable for detecting the overall brightness of a displayed image is provided in the display device. This embodiment provides a system for determining a reference voltage according to the detection result of the display quantity detection unit.

[0076] The display amount, which is an indicator indicating the overall brightness of a displayed image, is defined as the sum of grayscale display data of all pixels to take the brightness when all pixels display 100% white as the reference brightness. When all pixels are displayed with 50% brightness, the display amount is 0.5. Also, when half of the pixels are displayed with 100% brightness and the other half are displayed with 0% brightness, the display amount is 0.5. Display volume may also be referred to as average brightness. Since the display amount can be calculated from image display data, the display amount detection unit can be provided within the column control...

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Abstract

The invention relates to a semiconductor device, concretely, provides a display apparatus which includes: a light emitting element, a source which supplies a current to the light emitting element from a drain; a capacitor one end of which is connected to a gate of the transistor; a gate voltage setting circuit detachably connected to the gate of the transistor, the gate voltage setting circuit setting the gate voltage of the transistor to an initial voltage; and a capacitor terminal voltage setting circuit which is connected to another end of the capacitor, and which sets the voltage of the another end of the capacitor to any of data voltage corresponding to image information and constant reference voltage which does not depend on the image information, wherein a range, in which a current flowing through the light emitting element varies depending on the data voltage, is adjusted by changing one of the initial voltage and the reference voltage.

Description

technical field [0001] The present invention relates to a display device having self-luminous elements arranged in a matrix, especially organic EL (Electro Luminescence) elements, and a driving method thereof. Background technique [0002] A self-luminous display device typified by organic EL is configured by arranging a plurality of pixels including self-luminous elements in a matrix on a substrate. In the driver circuit of a self-luminous display device, in order to accurately apply gradation to each pixel, it is necessary to precisely control the amount of current flowing through the self-luminous element of each pixel or the self-luminous intensity applied to each pixel. The amount of voltage across the element. In general, a self-luminous display device has an active matrix configuration in which a switching element such as a thin film transistor (TFT) (active element, hereinafter referred to as TFT) is provided for each pixel. [0003] In the field of such display de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCG09G2300/0814G09G3/3233G09G2300/0819G09G2300/0871G09G2320/0271
Inventor 池田宏治井关正己川野藤雄丸博之乡田达人山下孝教
Owner CANON KK
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