# US 8,786,530 B2 · Display device and electronic apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,530 B2 - Document ID: US8786530B2 - Status: Granted - Kind: B2 - Application number: 13/495,336 - Filed: 2012-06-13 - Published: 2012-12-20 - Granted: 2014-07-22 - Earliest claimed: 2011-06-20 - Assignees: Japan Display West Inc. - Applicants: Masaya Tamaki - Inventors: Masaya Tamaki - Web page: https://patentgrep.com/patent/US8786530B2 ## CPC - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)} - G02F 1/13363: Birefringent elements, e.g. for optical compensation - G02F 1/133638: {Waveplates, i.e. plates with a retardation value of lambda/n} - G02F 2203/02: reflective - G02F 2413/02: Number of plates being 2 - G02F 2413/06: Two plates on one side of the LC cell - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0456: with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2380/14: Electronic books and readers - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A display device includes: a liquid crystal display panel; and a driver circuit that drives the liquid crystal display panel. The liquid crystal display panel includes a liquid crystal layer, pixel electrodes provided in a region facing the liquid crystal layer and which apply a voltage thereto, and a phase difference layer and a polarizing plate each provided on a side, relative to the liquid crystal layer, which ambient light enters. Each of the pixel electrodes includes a plurality of partial electrodes, and the driver circuit selects one or more partial electrodes from the partial electrodes to which a constant voltage is to be applied in accordance with an image signal. The constant voltage causes the liquid crystal display panel to be in a white state. The driver circuit performs gray-scale display by modulating lighting area of each pixel at a frame rate of less than 60 Hz. ## Claims ### Claim 1 A display device, comprising: a liquid crystal display panel; and a driver circuit driving the liquid crystal display panel, the liquid crystal display panel including a liquid crystal layer, a plurality of pixel electrodes, a phase difference layer, and a polarizing plate, the pixel electrodes being provided in a region facing the liquid crystal layer and applying a voltage to the liquid crystal layer, and the phase difference layer and the polarizing plate being provided on a side, relative to the liquid crystal layer, which ambient light enters, wherein each of the pixel electrodes includes a plurality of partial electrodes, and the driver circuit selects one or more partial electrodes from the partial electrodes to which a constant voltage is to be applied in accordance with an image signal, the constant voltage causing the liquid crystal display panel to be in a white state, and performs gray-scale display by modulating lighting area of each pixel at a frame rate of less than 60 Hz. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the frame rate is equal to or more than 0.1 Hz. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the liquid crystal display panel includes an anisotropic scattering layer provided on the side, relative to the liquid crystal layer, which the ambient light enters, and an orientation, a reflectance ratio of which has a highest value due to an effect of the anisotropic scattering layer, of the liquid crystal display panel is aligned with an orientation of a main viewing angle. ### Claim 4 (depends on 3) The display device according to claim 3, wherein the liquid crystal display panel is configured to allow an orientation, in which a flicker is most prominent without provision of the anisotropic scattering layer, to be different from the orientation of the main viewing angle. ### Claim 5 (depends on 1) The display device according to claim 1, further comprising a translucent common electrode provided on the side, relative to the liquid crystal layer, which the ambient light enters and facing the pixel electrodes across the liquid crystal layer, wherein the pixel electrodes are provided on a side, relative to the liquid crystal layer, opposite to the side which the ambient light enters, and serve as a reflection layer that reflects the ambient light incident from the liquid crystal layer toward the liquid crystal layer. ### Claim 6 (depends on 1) The display device according to claim 1, further comprising a reflective common electrode provided on a side, relative to the liquid crystal layer, opposite to the side which the ambient light enters, and facing the pixel electrodes across the liquid crystal layer, wherein the pixel electrodes are provided on the side, relative to the liquid crystal layer, which the ambient light enters, and include a material transparent to the ambient light incident from the liquid crystal layer. ### Claim 7 An electronic apparatus with a display device, the display device comprising: a liquid crystal display panel; and a driver circuit driving the liquid crystal display panel, the liquid crystal display panel including a liquid crystal layer, a plurality of pixel electrodes, a phase difference layer, and a polarizing plate, the pixel electrodes being provided in a region facing the liquid crystal layer and applying a voltage to the liquid crystal layer, and the phase difference layer and the polarizing plate being provided on a side, relative to the liquid crystal layer, which ambient light enters, wherein each of the pixel electrodes includes a plurality of partial electrodes, and the driver circuit selects one or more partial electrodes from the partial electrodes to which a constant voltage is to be applied in accordance with an image signal, the constant voltage causing the liquid crystal display panel to be in a white state, and performs gray-scale display by modulating lighting area of each pixel at a frame rate of less than 60 Hz.