EL DISPLAY DEVICE AND EL DISPLAY DEVICE DRIVE METHOD

• Main Authors: NAKAGAWA HIROBUMI, TAKAHARA HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 29.01.2015
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; BASIC ELECTRIC ELEMENTS; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PHYSICS; SEALS; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To make it possible to appropriately write a video signal to a pixel and achieve appropriate image display without occurrence of a problem that a source drive IC generates heat even if the size of a panel increases and higher definition is provided.SOLUTION: An EL display device includes: a source signal line 18; a gate signal line 17a; and a gate signal line 17b. A pixel 16 includes: a driving transistor 11a; a switching transistor 11b; and a switching transistor 11d, and a gate terminal of the switching transistor 11b is connected to the gate signal line 17a. The switching transistor 11b is turned on and the switching transistor 11d is turned on for a first period, whereby a first voltage is supplied to the source signal line 18, and the switching transistor 11b is turned off and the switching transistor 11d is turned on by applying a selection voltage to the gate signal line 17b for a second period, whereby a video signal is applied to a gate terminal of the driving transistor 11a. 【課題】パネルが大型化、高精細化されてもソースドライバＩＣの発熱問題が発生せず、良好に画素に映像信号を書き込め、良好な画像表示を実現する。【解決手段】ソース信号線１８と、ゲート信号線１７ａとゲート信号線１７ｂを具備し、画素１６は、駆動用トランジスタ１１ａと、スイッチ用トランジスタ１１ｂと、スイッチ用トランジスタ１１ｄとを有し、スイッチ用トランジスタ１１ｂのゲート端子は、ゲート信号線１７ａに接続されており、第１の期間に、スイッチ用トランジスタ１１ｂがオンし、スイッチ用トランジスタ１１ｄがオンすることにより、第１の電圧がソース信号線１８に供給され、第２の期間に、スイッチ用トランジスタ１１ｂがオフし、ゲート信号線１７ｂにスイッチ用トランジスタ１１ｄがオンすることにより、映像信号が駆動用トランジスタ１１ａのゲート端子に印加される。【選択図】図３